From b462c5775bbcce1cf5fe053f7123b8397b24b052 Mon Sep 17 00:00:00 2001 From: Vdaas CI Date: Fri, 15 Sep 2023 01:53:28 +0000 Subject: [PATCH] Update [vald sha: c964badf76413c8307abf1614859c2b1c92ff1bb] --- VALD_SHA | 2 +- build.gradle | 2 +- .../vald/api/v1/agent/core/AgentGrpc.java | 8 +- .../org/vdaas/vald/api/v1/payload/Info.java | 108 +- .../org/vdaas/vald/api/v1/payload/Insert.java | 120 +- .../org/vdaas/vald/api/v1/payload/Object.java | 2055 ++++++++++++++++- .../org/vdaas/vald/api/v1/payload/Remove.java | 1728 +++++++++++++- .../org/vdaas/vald/api/v1/payload/Search.java | 173 +- .../org/vdaas/vald/api/v1/payload/Update.java | 120 +- .../org/vdaas/vald/api/v1/payload/Upsert.java | 120 +- .../vald/api/v1/payload/ValdPayload.java | 328 +-- .../org/vdaas/vald/api/v1/rpc/BadRequest.java | 1965 ++++++++++++++++ .../vald/api/v1/rpc/BadRequestOrBuilder.java | 53 + .../org/vdaas/vald/api/v1/rpc/DebugInfo.java | 818 +++++++ .../vald/api/v1/rpc/DebugInfoOrBuilder.java | 70 + .../vald/api/v1/rpc/ErrorDetailsProto.java | 230 ++ .../org/vdaas/vald/api/v1/rpc/ErrorInfo.java | 1250 ++++++++++ .../vald/api/v1/rpc/ErrorInfoOrBuilder.java | 156 ++ .../java/org/vdaas/vald/api/v1/rpc/Help.java | 1647 +++++++++++++ .../vdaas/vald/api/v1/rpc/HelpOrBuilder.java | 53 + .../vald/api/v1/rpc/LocalizedMessage.java | 757 ++++++ .../api/v1/rpc/LocalizedMessageOrBuilder.java | 53 + .../vald/api/v1/rpc/PreconditionFailure.java | 1894 +++++++++++++++ .../v1/rpc/PreconditionFailureOrBuilder.java | 53 + .../vdaas/vald/api/v1/rpc/QuotaFailure.java | 1733 ++++++++++++++ .../api/v1/rpc/QuotaFailureOrBuilder.java | 53 + .../vdaas/vald/api/v1/rpc/RequestInfo.java | 757 ++++++ .../vald/api/v1/rpc/RequestInfoOrBuilder.java | 53 + .../vdaas/vald/api/v1/rpc/ResourceInfo.java | 1132 +++++++++ .../api/v1/rpc/ResourceInfoOrBuilder.java | 107 + .../org/vdaas/vald/api/v1/rpc/RetryInfo.java | 678 ++++++ .../vald/api/v1/rpc/RetryInfoOrBuilder.java | 36 + .../vdaas/vald/api/v1/vald/FilterGrpc.java | 8 +- .../vdaas/vald/api/v1/vald/InsertGrpc.java | 8 +- .../vdaas/vald/api/v1/vald/ObjectGrpc.java | 86 +- .../vdaas/vald/api/v1/vald/RemoveGrpc.java | 98 +- .../vdaas/vald/api/v1/vald/SearchGrpc.java | 8 +- .../vdaas/vald/api/v1/vald/UpdateGrpc.java | 8 +- .../vdaas/vald/api/v1/vald/UpsertGrpc.java | 8 +- .../vdaas/vald/api/v1/vald/ValdObject.java | 11 +- .../vdaas/vald/api/v1/vald/ValdRemove.java | 21 +- version/VALD_CLIENT_JAVA_VERSION | 2 +- 42 files changed, 18136 insertions(+), 434 deletions(-) create mode 100644 src/main/java/org/vdaas/vald/api/v1/rpc/BadRequest.java create mode 100644 src/main/java/org/vdaas/vald/api/v1/rpc/BadRequestOrBuilder.java create mode 100644 src/main/java/org/vdaas/vald/api/v1/rpc/DebugInfo.java create mode 100644 src/main/java/org/vdaas/vald/api/v1/rpc/DebugInfoOrBuilder.java create mode 100644 src/main/java/org/vdaas/vald/api/v1/rpc/ErrorDetailsProto.java create mode 100644 src/main/java/org/vdaas/vald/api/v1/rpc/ErrorInfo.java create mode 100644 src/main/java/org/vdaas/vald/api/v1/rpc/ErrorInfoOrBuilder.java create mode 100644 src/main/java/org/vdaas/vald/api/v1/rpc/Help.java create mode 100644 src/main/java/org/vdaas/vald/api/v1/rpc/HelpOrBuilder.java create mode 100644 src/main/java/org/vdaas/vald/api/v1/rpc/LocalizedMessage.java create mode 100644 src/main/java/org/vdaas/vald/api/v1/rpc/LocalizedMessageOrBuilder.java create mode 100644 src/main/java/org/vdaas/vald/api/v1/rpc/PreconditionFailure.java create mode 100644 src/main/java/org/vdaas/vald/api/v1/rpc/PreconditionFailureOrBuilder.java create mode 100644 src/main/java/org/vdaas/vald/api/v1/rpc/QuotaFailure.java create mode 100644 src/main/java/org/vdaas/vald/api/v1/rpc/QuotaFailureOrBuilder.java create mode 100644 src/main/java/org/vdaas/vald/api/v1/rpc/RequestInfo.java create mode 100644 src/main/java/org/vdaas/vald/api/v1/rpc/RequestInfoOrBuilder.java create mode 100644 src/main/java/org/vdaas/vald/api/v1/rpc/ResourceInfo.java create mode 100644 src/main/java/org/vdaas/vald/api/v1/rpc/ResourceInfoOrBuilder.java create mode 100644 src/main/java/org/vdaas/vald/api/v1/rpc/RetryInfo.java create mode 100644 src/main/java/org/vdaas/vald/api/v1/rpc/RetryInfoOrBuilder.java diff --git a/VALD_SHA b/VALD_SHA index a849c209..adedaa90 100644 --- a/VALD_SHA +++ b/VALD_SHA @@ -1 +1 @@ -bb8e8dc82e1dc8e17515c94f17931e491c2bcd04 +c964badf76413c8307abf1614859c2b1c92ff1bb diff --git a/build.gradle b/build.gradle index 092403a3..ae87bc3f 100644 --- a/build.gradle +++ b/build.gradle @@ -23,7 +23,7 @@ apply plugin: "com.google.protobuf" group = "org.vdaas.vald" archivesBaseName = "vald-client-java" -version = "1.7.6.Rev2" +version = "1.7.7" description = "a client library for Vald (https://github.com/vdaas/vald)." def isDevBuild diff --git a/src/main/java/org/vdaas/vald/api/v1/agent/core/AgentGrpc.java b/src/main/java/org/vdaas/vald/api/v1/agent/core/AgentGrpc.java index b5c841dc..cfaec902 100644 --- a/src/main/java/org/vdaas/vald/api/v1/agent/core/AgentGrpc.java +++ b/src/main/java/org/vdaas/vald/api/v1/agent/core/AgentGrpc.java @@ -8,14 +8,14 @@ * */ @javax.annotation.Generated( - value = "by gRPC proto compiler (version 1.55.1)", + value = "by gRPC proto compiler (version 1.58.0)", comments = "Source: apis/proto/v1/agent/core/agent.proto") @io.grpc.stub.annotations.GrpcGenerated public final class AgentGrpc { private AgentGrpc() {} - public static final String SERVICE_NAME = "core.v1.Agent"; + public static final java.lang.String SERVICE_NAME = "core.v1.Agent"; // Static method descriptors that strictly reflect the proto. private static volatile io.grpc.MethodDescriptor @@ -3200,7 +3201,7 @@ public org.vdaas.vald.api.v1.payload.Info.CPUOrBuilder getCpuOrBuilder() { */ @java.lang.Override public boolean hasMemory() { - return memory_ != null; + return ((bitField0_ & 0x00000002) != 0); } /** * 
@@ -3238,7 +3239,7 @@ public org.vdaas.vald.api.v1.payload.Info.MemoryOrBuilder getMemoryOrBuilder() {
      */
     @java.lang.Override
     public boolean hasNode() {
-      return node_ != null;
+      return ((bitField0_ & 0x00000004) != 0);
     }
     /**
      * 
@@ -3290,13 +3291,13 @@ public void writeTo(com.google.protobuf.CodedOutputStream output)
       if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(ip_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 4, ip_);
       }
-      if (cpu_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         output.writeMessage(5, getCpu());
       }
-      if (memory_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         output.writeMessage(6, getMemory());
       }
-      if (node_ != null) {
+      if (((bitField0_ & 0x00000004) != 0)) {
         output.writeMessage(7, getNode());
       }
       getUnknownFields().writeTo(output);
@@ -3320,15 +3321,15 @@ public int getSerializedSize() {
       if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(ip_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(4, ip_);
       }
-      if (cpu_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(5, getCpu());
       }
-      if (memory_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(6, getMemory());
       }
-      if (node_ != null) {
+      if (((bitField0_ & 0x00000004) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(7, getNode());
       }
@@ -3524,13 +3525,21 @@ public static final class Builder extends
 
       // Construct using org.vdaas.vald.api.v1.payload.Info.Pod.newBuilder()
       private Builder() {
-
+        maybeForceBuilderInitialization();
       }
 
       private Builder(
           com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
         super(parent);
-
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3
+                .alwaysUseFieldBuilders) {
+          getCpuFieldBuilder();
+          getMemoryFieldBuilder();
+          getNodeFieldBuilder();
+        }
       }
       @java.lang.Override
       public Builder clear() {
@@ -3600,21 +3609,26 @@ private void buildPartial0(org.vdaas.vald.api.v1.payload.Info.Pod result) {
         if (((from_bitField0_ & 0x00000008) != 0)) {
           result.ip_ = ip_;
         }
+        int to_bitField0_ = 0;
         if (((from_bitField0_ & 0x00000010) != 0)) {
           result.cpu_ = cpuBuilder_ == null
               ? cpu_
               : cpuBuilder_.build();
+          to_bitField0_ |= 0x00000001;
         }
         if (((from_bitField0_ & 0x00000020) != 0)) {
           result.memory_ = memoryBuilder_ == null
               ? memory_
               : memoryBuilder_.build();
+          to_bitField0_ |= 0x00000002;
         }
         if (((from_bitField0_ & 0x00000040) != 0)) {
           result.node_ = nodeBuilder_ == null
               ? node_
               : nodeBuilder_.build();
+          to_bitField0_ |= 0x00000004;
         }
+        result.bitField0_ |= to_bitField0_;
       }
 
       @java.lang.Override
@@ -4228,8 +4242,10 @@ public Builder mergeCpu(org.vdaas.vald.api.v1.payload.Info.CPU value) {
         } else {
           cpuBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000010;
-        onChanged();
+        if (cpu_ != null) {
+          bitField0_ |= 0x00000010;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -4383,8 +4399,10 @@ public Builder mergeMemory(org.vdaas.vald.api.v1.payload.Info.Memory value) {
         } else {
           memoryBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000020;
-        onChanged();
+        if (memory_ != null) {
+          bitField0_ |= 0x00000020;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -4538,8 +4556,10 @@ public Builder mergeNode(org.vdaas.vald.api.v1.payload.Info.Node value) {
         } else {
           nodeBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000040;
-        onChanged();
+        if (node_ != null) {
+          bitField0_ |= 0x00000040;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -4857,6 +4877,7 @@ protected java.lang.Object newInstance(
               org.vdaas.vald.api.v1.payload.Info.Node.class, org.vdaas.vald.api.v1.payload.Info.Node.Builder.class);
     }
 
+    private int bitField0_;
     public static final int NAME_FIELD_NUMBER = 1;
     @SuppressWarnings("serial")
     private volatile java.lang.Object name_ = "";
@@ -5010,7 +5031,7 @@ public java.lang.String getExternalAddr() {
      */
     @java.lang.Override
     public boolean hasCpu() {
-      return cpu_ != null;
+      return ((bitField0_ & 0x00000001) != 0);
     }
     /**
      * 
@@ -5048,7 +5069,7 @@ public org.vdaas.vald.api.v1.payload.Info.CPUOrBuilder getCpuOrBuilder() {
      */
     @java.lang.Override
     public boolean hasMemory() {
-      return memory_ != null;
+      return ((bitField0_ & 0x00000002) != 0);
     }
     /**
      * 
@@ -5086,7 +5107,7 @@ public org.vdaas.vald.api.v1.payload.Info.MemoryOrBuilder getMemoryOrBuilder() {
      */
     @java.lang.Override
     public boolean hasPods() {
-      return pods_ != null;
+      return ((bitField0_ & 0x00000004) != 0);
     }
     /**
      * 
@@ -5135,13 +5156,13 @@ public void writeTo(com.google.protobuf.CodedOutputStream output)
       if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(externalAddr_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 3, externalAddr_);
       }
-      if (cpu_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         output.writeMessage(4, getCpu());
       }
-      if (memory_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         output.writeMessage(5, getMemory());
       }
-      if (pods_ != null) {
+      if (((bitField0_ & 0x00000004) != 0)) {
         output.writeMessage(6, getPods());
       }
       getUnknownFields().writeTo(output);
@@ -5162,15 +5183,15 @@ public int getSerializedSize() {
       if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(externalAddr_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(3, externalAddr_);
       }
-      if (cpu_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(4, getCpu());
       }
-      if (memory_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(5, getMemory());
       }
-      if (pods_ != null) {
+      if (((bitField0_ & 0x00000004) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(6, getPods());
       }
@@ -5362,13 +5383,21 @@ public static final class Builder extends
 
       // Construct using org.vdaas.vald.api.v1.payload.Info.Node.newBuilder()
       private Builder() {
-
+        maybeForceBuilderInitialization();
       }
 
       private Builder(
           com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
         super(parent);
-
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3
+                .alwaysUseFieldBuilders) {
+          getCpuFieldBuilder();
+          getMemoryFieldBuilder();
+          getPodsFieldBuilder();
+        }
       }
       @java.lang.Override
       public Builder clear() {
@@ -5434,21 +5463,26 @@ private void buildPartial0(org.vdaas.vald.api.v1.payload.Info.Node result) {
         if (((from_bitField0_ & 0x00000004) != 0)) {
           result.externalAddr_ = externalAddr_;
         }
+        int to_bitField0_ = 0;
         if (((from_bitField0_ & 0x00000008) != 0)) {
           result.cpu_ = cpuBuilder_ == null
               ? cpu_
               : cpuBuilder_.build();
+          to_bitField0_ |= 0x00000001;
         }
         if (((from_bitField0_ & 0x00000010) != 0)) {
           result.memory_ = memoryBuilder_ == null
               ? memory_
               : memoryBuilder_.build();
+          to_bitField0_ |= 0x00000002;
         }
         if (((from_bitField0_ & 0x00000020) != 0)) {
           result.pods_ = podsBuilder_ == null
               ? pods_
               : podsBuilder_.build();
+          to_bitField0_ |= 0x00000004;
         }
+        result.bitField0_ |= to_bitField0_;
       }
 
       @java.lang.Override
@@ -5960,8 +5994,10 @@ public Builder mergeCpu(org.vdaas.vald.api.v1.payload.Info.CPU value) {
         } else {
           cpuBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000008;
-        onChanged();
+        if (cpu_ != null) {
+          bitField0_ |= 0x00000008;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -6115,8 +6151,10 @@ public Builder mergeMemory(org.vdaas.vald.api.v1.payload.Info.Memory value) {
         } else {
           memoryBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000010;
-        onChanged();
+        if (memory_ != null) {
+          bitField0_ |= 0x00000010;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -6270,8 +6308,10 @@ public Builder mergePods(org.vdaas.vald.api.v1.payload.Info.Pods value) {
         } else {
           podsBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000020;
-        onChanged();
+        if (pods_ != null) {
+          bitField0_ |= 0x00000020;
+          onChanged();
+        }
         return this;
       }
       /**
diff --git a/src/main/java/org/vdaas/vald/api/v1/payload/Insert.java b/src/main/java/org/vdaas/vald/api/v1/payload/Insert.java
index 36fc6f90..c5730911 100644
--- a/src/main/java/org/vdaas/vald/api/v1/payload/Insert.java
+++ b/src/main/java/org/vdaas/vald/api/v1/payload/Insert.java
@@ -139,6 +139,7 @@ protected java.lang.Object newInstance(
               org.vdaas.vald.api.v1.payload.Insert.Request.class, org.vdaas.vald.api.v1.payload.Insert.Request.Builder.class);
     }
 
+    private int bitField0_;
     public static final int VECTOR_FIELD_NUMBER = 1;
     private org.vdaas.vald.api.v1.payload.Object.Vector vector_;
     /**
@@ -151,7 +152,7 @@ protected java.lang.Object newInstance(
      */
     @java.lang.Override
     public boolean hasVector() {
-      return vector_ != null;
+      return ((bitField0_ & 0x00000001) != 0);
     }
     /**
      * 
@@ -189,7 +190,7 @@ public org.vdaas.vald.api.v1.payload.Object.VectorOrBuilder getVectorOrBuilder()
      */
     @java.lang.Override
     public boolean hasConfig() {
-      return config_ != null;
+      return ((bitField0_ & 0x00000002) != 0);
     }
     /**
      * 
@@ -229,10 +230,10 @@ public final boolean isInitialized() {
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output)
                         throws java.io.IOException {
-      if (vector_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         output.writeMessage(1, getVector());
       }
-      if (config_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         output.writeMessage(2, getConfig());
       }
       getUnknownFields().writeTo(output);
@@ -244,11 +245,11 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (vector_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(1, getVector());
       }
-      if (config_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(2, getConfig());
       }
@@ -419,13 +420,20 @@ public static final class Builder extends
 
       // Construct using org.vdaas.vald.api.v1.payload.Insert.Request.newBuilder()
       private Builder() {
-
+        maybeForceBuilderInitialization();
       }
 
       private Builder(
           com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
         super(parent);
-
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3
+                .alwaysUseFieldBuilders) {
+          getVectorFieldBuilder();
+          getConfigFieldBuilder();
+        }
       }
       @java.lang.Override
       public Builder clear() {
@@ -474,16 +482,20 @@ public org.vdaas.vald.api.v1.payload.Insert.Request buildPartial() {
 
       private void buildPartial0(org.vdaas.vald.api.v1.payload.Insert.Request result) {
         int from_bitField0_ = bitField0_;
+        int to_bitField0_ = 0;
         if (((from_bitField0_ & 0x00000001) != 0)) {
           result.vector_ = vectorBuilder_ == null
               ? vector_
               : vectorBuilder_.build();
+          to_bitField0_ |= 0x00000001;
         }
         if (((from_bitField0_ & 0x00000002) != 0)) {
           result.config_ = configBuilder_ == null
               ? config_
               : configBuilder_.build();
+          to_bitField0_ |= 0x00000002;
         }
+        result.bitField0_ |= to_bitField0_;
       }
 
       @java.lang.Override
@@ -679,8 +691,10 @@ public Builder mergeVector(org.vdaas.vald.api.v1.payload.Object.Vector value) {
         } else {
           vectorBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000001;
-        onChanged();
+        if (vector_ != null) {
+          bitField0_ |= 0x00000001;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -834,8 +848,10 @@ public Builder mergeConfig(org.vdaas.vald.api.v1.payload.Insert.Config value) {
         } else {
           configBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000002;
-        onChanged();
+        if (config_ != null) {
+          bitField0_ |= 0x00000002;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -1992,6 +2008,7 @@ protected java.lang.Object newInstance(
               org.vdaas.vald.api.v1.payload.Insert.ObjectRequest.class, org.vdaas.vald.api.v1.payload.Insert.ObjectRequest.Builder.class);
     }
 
+    private int bitField0_;
     public static final int OBJECT_FIELD_NUMBER = 1;
     private org.vdaas.vald.api.v1.payload.Object.Blob object_;
     /**
@@ -2004,7 +2021,7 @@ protected java.lang.Object newInstance(
      */
     @java.lang.Override
     public boolean hasObject() {
-      return object_ != null;
+      return ((bitField0_ & 0x00000001) != 0);
     }
     /**
      * 
@@ -2042,7 +2059,7 @@ public org.vdaas.vald.api.v1.payload.Object.BlobOrBuilder getObjectOrBuilder() {
      */
     @java.lang.Override
     public boolean hasConfig() {
-      return config_ != null;
+      return ((bitField0_ & 0x00000002) != 0);
     }
     /**
      * 
@@ -2080,7 +2097,7 @@ public org.vdaas.vald.api.v1.payload.Insert.ConfigOrBuilder getConfigOrBuilder()
      */
     @java.lang.Override
     public boolean hasVectorizer() {
-      return vectorizer_ != null;
+      return ((bitField0_ & 0x00000004) != 0);
     }
     /**
      * 
@@ -2120,13 +2137,13 @@ public final boolean isInitialized() {
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output)
                         throws java.io.IOException {
-      if (object_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         output.writeMessage(1, getObject());
       }
-      if (config_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         output.writeMessage(2, getConfig());
       }
-      if (vectorizer_ != null) {
+      if (((bitField0_ & 0x00000004) != 0)) {
         output.writeMessage(3, getVectorizer());
       }
       getUnknownFields().writeTo(output);
@@ -2138,15 +2155,15 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (object_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(1, getObject());
       }
-      if (config_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(2, getConfig());
       }
-      if (vectorizer_ != null) {
+      if (((bitField0_ & 0x00000004) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(3, getVectorizer());
       }
@@ -2326,13 +2343,21 @@ public static final class Builder extends
 
       // Construct using org.vdaas.vald.api.v1.payload.Insert.ObjectRequest.newBuilder()
       private Builder() {
-
+        maybeForceBuilderInitialization();
       }
 
       private Builder(
           com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
         super(parent);
-
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3
+                .alwaysUseFieldBuilders) {
+          getObjectFieldBuilder();
+          getConfigFieldBuilder();
+          getVectorizerFieldBuilder();
+        }
       }
       @java.lang.Override
       public Builder clear() {
@@ -2386,21 +2411,26 @@ public org.vdaas.vald.api.v1.payload.Insert.ObjectRequest buildPartial() {
 
       private void buildPartial0(org.vdaas.vald.api.v1.payload.Insert.ObjectRequest result) {
         int from_bitField0_ = bitField0_;
+        int to_bitField0_ = 0;
         if (((from_bitField0_ & 0x00000001) != 0)) {
           result.object_ = objectBuilder_ == null
               ? object_
               : objectBuilder_.build();
+          to_bitField0_ |= 0x00000001;
         }
         if (((from_bitField0_ & 0x00000002) != 0)) {
           result.config_ = configBuilder_ == null
               ? config_
               : configBuilder_.build();
+          to_bitField0_ |= 0x00000002;
         }
         if (((from_bitField0_ & 0x00000004) != 0)) {
           result.vectorizer_ = vectorizerBuilder_ == null
               ? vectorizer_
               : vectorizerBuilder_.build();
+          to_bitField0_ |= 0x00000004;
         }
+        result.bitField0_ |= to_bitField0_;
       }
 
       @java.lang.Override
@@ -2606,8 +2636,10 @@ public Builder mergeObject(org.vdaas.vald.api.v1.payload.Object.Blob value) {
         } else {
           objectBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000001;
-        onChanged();
+        if (object_ != null) {
+          bitField0_ |= 0x00000001;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -2761,8 +2793,10 @@ public Builder mergeConfig(org.vdaas.vald.api.v1.payload.Insert.Config value) {
         } else {
           configBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000002;
-        onChanged();
+        if (config_ != null) {
+          bitField0_ |= 0x00000002;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -2916,8 +2950,10 @@ public Builder mergeVectorizer(org.vdaas.vald.api.v1.payload.Filter.Target value
         } else {
           vectorizerBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000004;
-        onChanged();
+        if (vectorizer_ != null) {
+          bitField0_ |= 0x00000004;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -4040,6 +4076,7 @@ protected java.lang.Object newInstance(
               org.vdaas.vald.api.v1.payload.Insert.Config.class, org.vdaas.vald.api.v1.payload.Insert.Config.Builder.class);
     }
 
+    private int bitField0_;
     public static final int SKIP_STRICT_EXIST_CHECK_FIELD_NUMBER = 1;
     private boolean skipStrictExistCheck_ = false;
     /**
@@ -4067,7 +4104,7 @@ public boolean getSkipStrictExistCheck() {
      */
     @java.lang.Override
     public boolean hasFilters() {
-      return filters_ != null;
+      return ((bitField0_ & 0x00000001) != 0);
     }
     /**
      * 
@@ -4125,7 +4162,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output)
       if (skipStrictExistCheck_ != false) {
         output.writeBool(1, skipStrictExistCheck_);
       }
-      if (filters_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         output.writeMessage(2, getFilters());
       }
       if (timestamp_ != 0L) {
@@ -4144,7 +4181,7 @@ public int getSerializedSize() {
         size += com.google.protobuf.CodedOutputStream
           .computeBoolSize(1, skipStrictExistCheck_);
       }
-      if (filters_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(2, getFilters());
       }
@@ -4320,13 +4357,19 @@ public static final class Builder extends
 
       // Construct using org.vdaas.vald.api.v1.payload.Insert.Config.newBuilder()
       private Builder() {
-
+        maybeForceBuilderInitialization();
       }
 
       private Builder(
           com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
         super(parent);
-
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3
+                .alwaysUseFieldBuilders) {
+          getFiltersFieldBuilder();
+        }
       }
       @java.lang.Override
       public Builder clear() {
@@ -4375,14 +4418,17 @@ private void buildPartial0(org.vdaas.vald.api.v1.payload.Insert.Config result) {
         if (((from_bitField0_ & 0x00000001) != 0)) {
           result.skipStrictExistCheck_ = skipStrictExistCheck_;
         }
+        int to_bitField0_ = 0;
         if (((from_bitField0_ & 0x00000002) != 0)) {
           result.filters_ = filtersBuilder_ == null
               ? filters_
               : filtersBuilder_.build();
+          to_bitField0_ |= 0x00000001;
         }
         if (((from_bitField0_ & 0x00000004) != 0)) {
           result.timestamp_ = timestamp_;
         }
+        result.bitField0_ |= to_bitField0_;
       }
 
       @java.lang.Override
@@ -4628,8 +4674,10 @@ public Builder mergeFilters(org.vdaas.vald.api.v1.payload.Filter.Config value) {
         } else {
           filtersBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000002;
-        onChanged();
+        if (filters_ != null) {
+          bitField0_ |= 0x00000002;
+          onChanged();
+        }
         return this;
       }
       /**
diff --git a/src/main/java/org/vdaas/vald/api/v1/payload/Object.java b/src/main/java/org/vdaas/vald/api/v1/payload/Object.java
index 5c2a0353..ecf75cd7 100644
--- a/src/main/java/org/vdaas/vald/api/v1/payload/Object.java
+++ b/src/main/java/org/vdaas/vald/api/v1/payload/Object.java
@@ -139,6 +139,7 @@ protected java.lang.Object newInstance(
               org.vdaas.vald.api.v1.payload.Object.VectorRequest.class, org.vdaas.vald.api.v1.payload.Object.VectorRequest.Builder.class);
     }
 
+    private int bitField0_;
     public static final int ID_FIELD_NUMBER = 1;
     private org.vdaas.vald.api.v1.payload.Object.ID id_;
     /**
@@ -151,7 +152,7 @@ protected java.lang.Object newInstance(
      */
     @java.lang.Override
     public boolean hasId() {
-      return id_ != null;
+      return ((bitField0_ & 0x00000001) != 0);
     }
     /**
      * 
@@ -189,7 +190,7 @@ public org.vdaas.vald.api.v1.payload.Object.IDOrBuilder getIdOrBuilder() {
      */
     @java.lang.Override
     public boolean hasFilters() {
-      return filters_ != null;
+      return ((bitField0_ & 0x00000002) != 0);
     }
     /**
      * 
@@ -229,10 +230,10 @@ public final boolean isInitialized() {
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output)
                         throws java.io.IOException {
-      if (id_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         output.writeMessage(1, getId());
       }
-      if (filters_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         output.writeMessage(2, getFilters());
       }
       getUnknownFields().writeTo(output);
@@ -244,11 +245,11 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (id_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(1, getId());
       }
-      if (filters_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(2, getFilters());
       }
@@ -419,13 +420,20 @@ public static final class Builder extends
 
       // Construct using org.vdaas.vald.api.v1.payload.Object.VectorRequest.newBuilder()
       private Builder() {
-
+        maybeForceBuilderInitialization();
       }
 
       private Builder(
           com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
         super(parent);
-
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3
+                .alwaysUseFieldBuilders) {
+          getIdFieldBuilder();
+          getFiltersFieldBuilder();
+        }
       }
       @java.lang.Override
       public Builder clear() {
@@ -474,16 +482,20 @@ public org.vdaas.vald.api.v1.payload.Object.VectorRequest buildPartial() {
 
       private void buildPartial0(org.vdaas.vald.api.v1.payload.Object.VectorRequest result) {
         int from_bitField0_ = bitField0_;
+        int to_bitField0_ = 0;
         if (((from_bitField0_ & 0x00000001) != 0)) {
           result.id_ = idBuilder_ == null
               ? id_
               : idBuilder_.build();
+          to_bitField0_ |= 0x00000001;
         }
         if (((from_bitField0_ & 0x00000002) != 0)) {
           result.filters_ = filtersBuilder_ == null
               ? filters_
               : filtersBuilder_.build();
+          to_bitField0_ |= 0x00000002;
         }
+        result.bitField0_ |= to_bitField0_;
       }
 
       @java.lang.Override
@@ -679,8 +691,10 @@ public Builder mergeId(org.vdaas.vald.api.v1.payload.Object.ID value) {
         } else {
           idBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000001;
-        onChanged();
+        if (id_ != null) {
+          bitField0_ |= 0x00000001;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -834,8 +848,10 @@ public Builder mergeFilters(org.vdaas.vald.api.v1.payload.Filter.Config value) {
         } else {
           filtersBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000002;
-        onChanged();
+        if (filters_ != null) {
+          bitField0_ |= 0x00000002;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -3949,6 +3965,16 @@ public interface VectorOrBuilder extends
      * @return The vector at the given index.
      */
     float getVector(int index);
+
+    /**
+     * 
+     * timestamp represents when this vector inserted.
+     * 

+     *
+     * int64 timestamp = 3;
+     * @return The timestamp.
+     */
+    long getTimestamp();
   }
   /**
    * 
@@ -4040,7 +4066,8 @@ public java.lang.String getId() {
 
     public static final int VECTOR_FIELD_NUMBER = 2;
     @SuppressWarnings("serial")
-    private com.google.protobuf.Internal.FloatList vector_;
+    private com.google.protobuf.Internal.FloatList vector_ =
+        emptyFloatList();
     /**
      * 
      * The vector.
@@ -4079,6 +4106,21 @@ public float getVector(int index) {
     }
     private int vectorMemoizedSerializedSize = -1;
 
+    public static final int TIMESTAMP_FIELD_NUMBER = 3;
+    private long timestamp_ = 0L;
+    /**
+     * 
+     * timestamp represents when this vector inserted.
+     * 

+     *
+     * int64 timestamp = 3;
+     * @return The timestamp.
+     */
+    @java.lang.Override
+    public long getTimestamp() {
+      return timestamp_;
+    }
+
     private byte memoizedIsInitialized = -1;
     @java.lang.Override
     public final boolean isInitialized() {
@@ -4104,6 +4146,9 @@ public void writeTo(com.google.protobuf.CodedOutputStream output)
       for (int i = 0; i < vector_.size(); i++) {
         output.writeFloatNoTag(vector_.getFloat(i));
       }
+      if (timestamp_ != 0L) {
+        output.writeInt64(3, timestamp_);
+      }
       getUnknownFields().writeTo(output);
     }
 
@@ -4127,6 +4172,10 @@ public int getSerializedSize() {
         }
         vectorMemoizedSerializedSize = dataSize;
       }
+      if (timestamp_ != 0L) {
+        size += com.google.protobuf.CodedOutputStream
+          .computeInt64Size(3, timestamp_);
+      }
       size += getUnknownFields().getSerializedSize();
       memoizedSize = size;
       return size;
@@ -4146,6 +4195,8 @@ public boolean equals(final java.lang.Object obj) {
           .equals(other.getId())) return false;
       if (!getVectorList()
           .equals(other.getVectorList())) return false;
+      if (getTimestamp()
+          != other.getTimestamp()) return false;
       if (!getUnknownFields().equals(other.getUnknownFields())) return false;
       return true;
     }
@@ -4163,6 +4214,9 @@ public int hashCode() {
         hash = (37 * hash) + VECTOR_FIELD_NUMBER;
         hash = (53 * hash) + getVectorList().hashCode();
       }
+      hash = (37 * hash) + TIMESTAMP_FIELD_NUMBER;
+      hash = (53 * hash) + com.google.protobuf.Internal.hashLong(
+          getTimestamp());
       hash = (29 * hash) + getUnknownFields().hashCode();
       memoizedHashCode = hash;
       return hash;
@@ -4300,6 +4354,7 @@ public Builder clear() {
         bitField0_ = 0;
         id_ = "";
         vector_ = emptyFloatList();
+        timestamp_ = 0L;
         return this;
       }
 
@@ -4326,25 +4381,23 @@ public org.vdaas.vald.api.v1.payload.Object.Vector build() {
       @java.lang.Override
       public org.vdaas.vald.api.v1.payload.Object.Vector buildPartial() {
         org.vdaas.vald.api.v1.payload.Object.Vector result = new org.vdaas.vald.api.v1.payload.Object.Vector(this);
-        buildPartialRepeatedFields(result);
         if (bitField0_ != 0) { buildPartial0(result); }
         onBuilt();
         return result;
       }
 
-      private void buildPartialRepeatedFields(org.vdaas.vald.api.v1.payload.Object.Vector result) {
-        if (((bitField0_ & 0x00000002) != 0)) {
-          vector_.makeImmutable();
-          bitField0_ = (bitField0_ & ~0x00000002);
-        }
-        result.vector_ = vector_;
-      }
-
       private void buildPartial0(org.vdaas.vald.api.v1.payload.Object.Vector result) {
         int from_bitField0_ = bitField0_;
         if (((from_bitField0_ & 0x00000001) != 0)) {
           result.id_ = id_;
         }
+        if (((from_bitField0_ & 0x00000002) != 0)) {
+          vector_.makeImmutable();
+          result.vector_ = vector_;
+        }
+        if (((from_bitField0_ & 0x00000004) != 0)) {
+          result.timestamp_ = timestamp_;
+        }
       }
 
       @java.lang.Override
@@ -4399,13 +4452,17 @@ public Builder mergeFrom(org.vdaas.vald.api.v1.payload.Object.Vector other) {
         if (!other.vector_.isEmpty()) {
           if (vector_.isEmpty()) {
             vector_ = other.vector_;
-            bitField0_ = (bitField0_ & ~0x00000002);
+            vector_.makeImmutable();
+            bitField0_ |= 0x00000002;
           } else {
             ensureVectorIsMutable();
             vector_.addAll(other.vector_);
           }
           onChanged();
         }
+        if (other.getTimestamp() != 0L) {
+          setTimestamp(other.getTimestamp());
+        }
         this.mergeUnknownFields(other.getUnknownFields());
         onChanged();
         return this;
@@ -4446,13 +4503,19 @@ public Builder mergeFrom(
               case 18: {
                 int length = input.readRawVarint32();
                 int limit = input.pushLimit(length);
-                ensureVectorIsMutable();
+                int alloc = length > 4096 ? 4096 : length;
+                ensureVectorIsMutable(alloc / 4);
                 while (input.getBytesUntilLimit() > 0) {
                   vector_.addFloat(input.readFloat());
                 }
                 input.popLimit(limit);
                 break;
               } // case 18
+              case 24: {
+                timestamp_ = input.readInt64();
+                bitField0_ |= 0x00000004;
+                break;
+              } // case 24
               default: {
                 if (!super.parseUnknownField(input, extensionRegistry, tag)) {
                   done = true; // was an endgroup tag
@@ -4564,10 +4627,16 @@ public Builder setIdBytes(
 
       private com.google.protobuf.Internal.FloatList vector_ = emptyFloatList();
       private void ensureVectorIsMutable() {
-        if (!((bitField0_ & 0x00000002) != 0)) {
-          vector_ = mutableCopy(vector_);
-          bitField0_ |= 0x00000002;
+        if (!vector_.isModifiable()) {
+          vector_ = makeMutableCopy(vector_);
+        }
+        bitField0_ |= 0x00000002;
+      }
+      private void ensureVectorIsMutable(int capacity) {
+        if (!vector_.isModifiable()) {
+          vector_ = makeMutableCopy(vector_, capacity);
         }
+        bitField0_ |= 0x00000002;
       }
       /**
        * 
@@ -4579,8 +4648,8 @@ private void ensureVectorIsMutable() {
        */
       public java.util.List
           getVectorList() {
-        return ((bitField0_ & 0x00000002) != 0) ?
-                 java.util.Collections.unmodifiableList(vector_) : vector_;
+        vector_.makeImmutable();
+        return vector_;
       }
       /**
        * 
@@ -4620,6 +4689,7 @@ public Builder setVector(
 
         ensureVectorIsMutable();
         vector_.setFloat(index, value);
+        bitField0_ |= 0x00000002;
         onChanged();
         return this;
       }
@@ -4636,6 +4706,7 @@ public Builder addVector(float value) {
 
         ensureVectorIsMutable();
         vector_.addFloat(value);
+        bitField0_ |= 0x00000002;
         onChanged();
         return this;
       }
@@ -4653,6 +4724,7 @@ public Builder addAllVector(
         ensureVectorIsMutable();
         com.google.protobuf.AbstractMessageLite.Builder.addAll(
             values, vector_);
+        bitField0_ |= 0x00000002;
         onChanged();
         return this;
       }
@@ -4670,6 +4742,50 @@ public Builder clearVector() {
         onChanged();
         return this;
       }
+
+      private long timestamp_ ;
+      /**
+       * 
+       * timestamp represents when this vector inserted.
+       * 

+       *
+       * int64 timestamp = 3;
+       * @return The timestamp.
+       */
+      @java.lang.Override
+      public long getTimestamp() {
+        return timestamp_;
+      }
+      /**
+       * 
+       * timestamp represents when this vector inserted.
+       * 

+       *
+       * int64 timestamp = 3;
+       * @param value The timestamp to set.
+       * @return This builder for chaining.
+       */
+      public Builder setTimestamp(long value) {
+
+        timestamp_ = value;
+        bitField0_ |= 0x00000004;
+        onChanged();
+        return this;
+      }
+      /**
+       * 
+       * timestamp represents when this vector inserted.
+       * 

+       *
+       * int64 timestamp = 3;
+       * @return This builder for chaining.
+       */
+      public Builder clearTimestamp() {
+        bitField0_ = (bitField0_ & ~0x00000004);
+        timestamp_ = 0L;
+        onChanged();
+        return this;
+      }
       @java.lang.Override
       public final Builder setUnknownFields(
           final com.google.protobuf.UnknownFieldSet unknownFields) {
@@ -6680,7 +6796,8 @@ public com.google.protobuf.ByteString getObject() {
 
     public static final int SHAPE_FIELD_NUMBER = 2;
     @SuppressWarnings("serial")
-    private com.google.protobuf.Internal.IntList shape_;
+    private com.google.protobuf.Internal.IntList shape_ =
+        emptyIntList();
     /**
      * 
      * The new shape.
@@ -6970,25 +7087,20 @@ public org.vdaas.vald.api.v1.payload.Object.ReshapeVector build() {
       @java.lang.Override
       public org.vdaas.vald.api.v1.payload.Object.ReshapeVector buildPartial() {
         org.vdaas.vald.api.v1.payload.Object.ReshapeVector result = new org.vdaas.vald.api.v1.payload.Object.ReshapeVector(this);
-        buildPartialRepeatedFields(result);
         if (bitField0_ != 0) { buildPartial0(result); }
         onBuilt();
         return result;
       }
 
-      private void buildPartialRepeatedFields(org.vdaas.vald.api.v1.payload.Object.ReshapeVector result) {
-        if (((bitField0_ & 0x00000002) != 0)) {
-          shape_.makeImmutable();
-          bitField0_ = (bitField0_ & ~0x00000002);
-        }
-        result.shape_ = shape_;
-      }
-
       private void buildPartial0(org.vdaas.vald.api.v1.payload.Object.ReshapeVector result) {
         int from_bitField0_ = bitField0_;
         if (((from_bitField0_ & 0x00000001) != 0)) {
           result.object_ = object_;
         }
+        if (((from_bitField0_ & 0x00000002) != 0)) {
+          shape_.makeImmutable();
+          result.shape_ = shape_;
+        }
       }
 
       @java.lang.Override
@@ -7041,7 +7153,8 @@ public Builder mergeFrom(org.vdaas.vald.api.v1.payload.Object.ReshapeVector othe
         if (!other.shape_.isEmpty()) {
           if (shape_.isEmpty()) {
             shape_ = other.shape_;
-            bitField0_ = (bitField0_ & ~0x00000002);
+            shape_.makeImmutable();
+            bitField0_ |= 0x00000002;
           } else {
             ensureShapeIsMutable();
             shape_.addAll(other.shape_);
@@ -7158,10 +7271,10 @@ public Builder clearObject() {
 
       private com.google.protobuf.Internal.IntList shape_ = emptyIntList();
       private void ensureShapeIsMutable() {
-        if (!((bitField0_ & 0x00000002) != 0)) {
-          shape_ = mutableCopy(shape_);
-          bitField0_ |= 0x00000002;
+        if (!shape_.isModifiable()) {
+          shape_ = makeMutableCopy(shape_);
         }
+        bitField0_ |= 0x00000002;
       }
       /**
        * 
@@ -7173,8 +7286,8 @@ private void ensureShapeIsMutable() {
        */
       public java.util.List
           getShapeList() {
-        return ((bitField0_ & 0x00000002) != 0) ?
-                 java.util.Collections.unmodifiableList(shape_) : shape_;
+        shape_.makeImmutable();
+        return shape_;
       }
       /**
        * 
@@ -7214,6 +7327,7 @@ public Builder setShape(
 
         ensureShapeIsMutable();
         shape_.setInt(index, value);
+        bitField0_ |= 0x00000002;
         onChanged();
         return this;
       }
@@ -7230,6 +7344,7 @@ public Builder addShape(int value) {
 
         ensureShapeIsMutable();
         shape_.addInt(value);
+        bitField0_ |= 0x00000002;
         onChanged();
         return this;
       }
@@ -7247,6 +7362,7 @@ public Builder addAllShape(
         ensureShapeIsMutable();
         com.google.protobuf.AbstractMessageLite.Builder.addAll(
             values, shape_);
+        bitField0_ |= 0x00000002;
         onChanged();
         return this;
       }
@@ -11979,6 +12095,1855 @@ public org.vdaas.vald.api.v1.payload.Object.Locations getDefaultInstanceForType(
 
   }
 
+  public interface ListOrBuilder extends
+      // @@protoc_insertion_point(interface_extends:payload.v1.Object.List)
+      com.google.protobuf.MessageOrBuilder {
+  }
+  /**
+   * 
+   * Represent the list object vector stream request and response.
+   * 

+   *
+   * Protobuf type {@code payload.v1.Object.List}
+   */
+  public static final class List extends
+      com.google.protobuf.GeneratedMessageV3 implements
+      // @@protoc_insertion_point(message_implements:payload.v1.Object.List)
+      ListOrBuilder {
+  private static final long serialVersionUID = 0L;
+    // Use List.newBuilder() to construct.
+    private List(com.google.protobuf.GeneratedMessageV3.Builder builder) {
+      super(builder);
+    }
+    private List() {
+    }
+
+    @java.lang.Override
+    @SuppressWarnings({"unused"})
+    protected java.lang.Object newInstance(
+        UnusedPrivateParameter unused) {
+      return new List();
+    }
+
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return org.vdaas.vald.api.v1.payload.ValdPayload.internal_static_payload_v1_Object_List_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
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+        // @@protoc_insertion_point(interface_extends:payload.v1.Object.List.Request)
+        com.google.protobuf.MessageOrBuilder {
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+        // @@protoc_insertion_point(message_implements:payload.v1.Object.List.Request)
+        RequestOrBuilder {
+    private static final long serialVersionUID = 0L;
+      // Use Request.newBuilder() to construct.
+      private Request(com.google.protobuf.GeneratedMessageV3.Builder builder) {
+        super(builder);
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+      private Request() {
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+      protected java.lang.Object newInstance(
+          UnusedPrivateParameter unused) {
+        return new Request();
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+          getDescriptor() {
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+      }
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+      public boolean equals(final java.lang.Object obj) {
+        if (obj == this) {
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+        if (!(obj instanceof org.vdaas.vald.api.v1.payload.Object.List.Request)) {
+          return super.equals(obj);
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+
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+        int hash = 41;
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+        memoizedHashCode = hash;
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+          java.nio.ByteBuffer data)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        return PARSER.parseFrom(data);
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+      public static org.vdaas.vald.api.v1.payload.Object.List.Request parseFrom(
+          java.nio.ByteBuffer data,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        return PARSER.parseFrom(data, extensionRegistry);
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+      public static org.vdaas.vald.api.v1.payload.Object.List.Request parseFrom(
+          com.google.protobuf.ByteString data)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        return PARSER.parseFrom(data);
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+      public static org.vdaas.vald.api.v1.payload.Object.List.Request parseFrom(
+          com.google.protobuf.ByteString data,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        return PARSER.parseFrom(data, extensionRegistry);
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+      public static org.vdaas.vald.api.v1.payload.Object.List.Request parseFrom(byte[] data)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        return PARSER.parseFrom(data);
+      }
+      public static org.vdaas.vald.api.v1.payload.Object.List.Request parseFrom(
+          byte[] data,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        return PARSER.parseFrom(data, extensionRegistry);
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+      public static org.vdaas.vald.api.v1.payload.Object.List.Request parseFrom(java.io.InputStream input)
+          throws java.io.IOException {
+        return com.google.protobuf.GeneratedMessageV3
+            .parseWithIOException(PARSER, input);
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+      public static org.vdaas.vald.api.v1.payload.Object.List.Request parseFrom(
+          java.io.InputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        return com.google.protobuf.GeneratedMessageV3
+            .parseWithIOException(PARSER, input, extensionRegistry);
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+      public static org.vdaas.vald.api.v1.payload.Object.List.Request parseDelimitedFrom(java.io.InputStream input)
+          throws java.io.IOException {
+        return com.google.protobuf.GeneratedMessageV3
+            .parseDelimitedWithIOException(PARSER, input);
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+      public static org.vdaas.vald.api.v1.payload.Object.List.Request parseDelimitedFrom(
+          java.io.InputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        return com.google.protobuf.GeneratedMessageV3
+            .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
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+          com.google.protobuf.CodedInputStream input)
+          throws java.io.IOException {
+        return com.google.protobuf.GeneratedMessageV3
+            .parseWithIOException(PARSER, input);
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+      public static org.vdaas.vald.api.v1.payload.Object.List.Request parseFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        return com.google.protobuf.GeneratedMessageV3
+            .parseWithIOException(PARSER, input, extensionRegistry);
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+      @java.lang.Override
+      public Builder newBuilderForType() { return newBuilder(); }
+      public static Builder newBuilder() {
+        return DEFAULT_INSTANCE.toBuilder();
+      }
+      public static Builder newBuilder(org.vdaas.vald.api.v1.payload.Object.List.Request prototype) {
+        return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+      }
+      @java.lang.Override
+      public Builder toBuilder() {
+        return this == DEFAULT_INSTANCE
+            ? new Builder() : new Builder().mergeFrom(this);
+      }
+
+      @java.lang.Override
+      protected Builder newBuilderForType(
+          com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+        Builder builder = new Builder(parent);
+        return builder;
+      }
+      /**
+       * Protobuf type {@code payload.v1.Object.List.Request}
+       */
+      public static final class Builder extends
+          com.google.protobuf.GeneratedMessageV3.Builder implements
+          // @@protoc_insertion_point(builder_implements:payload.v1.Object.List.Request)
+          org.vdaas.vald.api.v1.payload.Object.List.RequestOrBuilder {
+        public static final com.google.protobuf.Descriptors.Descriptor
+            getDescriptor() {
+          return org.vdaas.vald.api.v1.payload.ValdPayload.internal_static_payload_v1_Object_List_Request_descriptor;
+        }
+
+        @java.lang.Override
+        protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+            internalGetFieldAccessorTable() {
+          return org.vdaas.vald.api.v1.payload.ValdPayload.internal_static_payload_v1_Object_List_Request_fieldAccessorTable
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+        }
+
+        // Construct using org.vdaas.vald.api.v1.payload.Object.List.Request.newBuilder()
+        private Builder() {
+
+        }
+
+        private Builder(
+            com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+          super(parent);
+
+        }
+        @java.lang.Override
+        public Builder clear() {
+          super.clear();
+          return this;
+        }
+
+        @java.lang.Override
+        public com.google.protobuf.Descriptors.Descriptor
+            getDescriptorForType() {
+          return org.vdaas.vald.api.v1.payload.ValdPayload.internal_static_payload_v1_Object_List_Request_descriptor;
+        }
+
+        @java.lang.Override
+        public org.vdaas.vald.api.v1.payload.Object.List.Request getDefaultInstanceForType() {
+          return org.vdaas.vald.api.v1.payload.Object.List.Request.getDefaultInstance();
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+        @java.lang.Override
+        public org.vdaas.vald.api.v1.payload.Object.List.Request build() {
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+          if (!result.isInitialized()) {
+            throw newUninitializedMessageException(result);
+          }
+          return result;
+        }
+
+        @java.lang.Override
+        public org.vdaas.vald.api.v1.payload.Object.List.Request buildPartial() {
+          org.vdaas.vald.api.v1.payload.Object.List.Request result = new org.vdaas.vald.api.v1.payload.Object.List.Request(this);
+          onBuilt();
+          return result;
+        }
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+        public Builder clone() {
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+        public Builder setField(
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+            java.lang.Object value) {
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+        @java.lang.Override
+        public Builder clearField(
+            com.google.protobuf.Descriptors.FieldDescriptor field) {
+          return super.clearField(field);
+        }
+        @java.lang.Override
+        public Builder clearOneof(
+            com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+          return super.clearOneof(oneof);
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+        @java.lang.Override
+        public Builder setRepeatedField(
+            com.google.protobuf.Descriptors.FieldDescriptor field,
+            int index, java.lang.Object value) {
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+        public Builder addRepeatedField(
+            com.google.protobuf.Descriptors.FieldDescriptor field,
+            java.lang.Object value) {
+          return super.addRepeatedField(field, value);
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+        @java.lang.Override
+        public Builder mergeFrom(com.google.protobuf.Message other) {
+          if (other instanceof org.vdaas.vald.api.v1.payload.Object.List.Request) {
+            return mergeFrom((org.vdaas.vald.api.v1.payload.Object.List.Request)other);
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+            return this;
+          }
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+
+        public Builder mergeFrom(org.vdaas.vald.api.v1.payload.Object.List.Request other) {
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+          this.mergeUnknownFields(other.getUnknownFields());
+          onChanged();
+          return this;
+        }
+
+        @java.lang.Override
+        public final boolean isInitialized() {
+          return true;
+        }
+
+        @java.lang.Override
+        public Builder mergeFrom(
+            com.google.protobuf.CodedInputStream input,
+            com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+            throws java.io.IOException {
+          if (extensionRegistry == null) {
+            throw new java.lang.NullPointerException();
+          }
+          try {
+            boolean done = false;
+            while (!done) {
+              int tag = input.readTag();
+              switch (tag) {
+                case 0:
+                  done = true;
+                  break;
+                default: {
+                  if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                    done = true; // was an endgroup tag
+                  }
+                  break;
+                } // default:
+              } // switch (tag)
+            } // while (!done)
+          } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+            throw e.unwrapIOException();
+          } finally {
+            onChanged();
+          } // finally
+          return this;
+        }
+        @java.lang.Override
+        public final Builder setUnknownFields(
+            final com.google.protobuf.UnknownFieldSet unknownFields) {
+          return super.setUnknownFields(unknownFields);
+        }
+
+        @java.lang.Override
+        public final Builder mergeUnknownFields(
+            final com.google.protobuf.UnknownFieldSet unknownFields) {
+          return super.mergeUnknownFields(unknownFields);
+        }
+
+
+        // @@protoc_insertion_point(builder_scope:payload.v1.Object.List.Request)
+      }
+
+      // @@protoc_insertion_point(class_scope:payload.v1.Object.List.Request)
+      private static final org.vdaas.vald.api.v1.payload.Object.List.Request DEFAULT_INSTANCE;
+      static {
+        DEFAULT_INSTANCE = new org.vdaas.vald.api.v1.payload.Object.List.Request();
+      }
+
+      public static org.vdaas.vald.api.v1.payload.Object.List.Request getDefaultInstance() {
+        return DEFAULT_INSTANCE;
+      }
+
+      private static final com.google.protobuf.Parser
+          PARSER = new com.google.protobuf.AbstractParser() {
+        @java.lang.Override
+        public Request parsePartialFrom(
+            com.google.protobuf.CodedInputStream input,
+            com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+            throws com.google.protobuf.InvalidProtocolBufferException {
+          Builder builder = newBuilder();
+          try {
+            builder.mergeFrom(input, extensionRegistry);
+          } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+            throw e.setUnfinishedMessage(builder.buildPartial());
+          } catch (com.google.protobuf.UninitializedMessageException e) {
+            throw e.asInvalidProtocolBufferException().setUnfinishedMessage(builder.buildPartial());
+          } catch (java.io.IOException e) {
+            throw new com.google.protobuf.InvalidProtocolBufferException(e)
+                .setUnfinishedMessage(builder.buildPartial());
+          }
+          return builder.buildPartial();
+        }
+      };
+
+      public static com.google.protobuf.Parser parser() {
+        return PARSER;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Parser getParserForType() {
+        return PARSER;
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.payload.Object.List.Request getDefaultInstanceForType() {
+        return DEFAULT_INSTANCE;
+      }
+
+    }
+
+    public interface ResponseOrBuilder extends
+        // @@protoc_insertion_point(interface_extends:payload.v1.Object.List.Response)
+        com.google.protobuf.MessageOrBuilder {
+
+      /**
+       * 
+       * The vector
+       * 

+       *
+       * .payload.v1.Object.Vector vector = 1;
+       * @return Whether the vector field is set.
+       */
+      boolean hasVector();
+      /**
+       * 
+       * The vector
+       * 

+       *
+       * .payload.v1.Object.Vector vector = 1;
+       * @return The vector.
+       */
+      org.vdaas.vald.api.v1.payload.Object.Vector getVector();
+      /**
+       * 
+       * The vector
+       * 

+       *
+       * .payload.v1.Object.Vector vector = 1;
+       */
+      org.vdaas.vald.api.v1.payload.Object.VectorOrBuilder getVectorOrBuilder();
+
+      /**
+       * 
+       * The RPC error status.
+       * 

+       *
+       * .google.rpc.Status status = 2;
+       * @return Whether the status field is set.
+       */
+      boolean hasStatus();
+      /**
+       * 
+       * The RPC error status.
+       * 

+       *
+       * .google.rpc.Status status = 2;
+       * @return The status.
+       */
+      com.google.rpc.Status getStatus();
+      /**
+       * 
+       * The RPC error status.
+       * 

+       *
+       * .google.rpc.Status status = 2;
+       */
+      com.google.rpc.StatusOrBuilder getStatusOrBuilder();
+
+      org.vdaas.vald.api.v1.payload.Object.List.Response.PayloadCase getPayloadCase();
+    }
+    /**
+     * Protobuf type {@code payload.v1.Object.List.Response}
+     */
+    public static final class Response extends
+        com.google.protobuf.GeneratedMessageV3 implements
+        // @@protoc_insertion_point(message_implements:payload.v1.Object.List.Response)
+        ResponseOrBuilder {
+    private static final long serialVersionUID = 0L;
+      // Use Response.newBuilder() to construct.
+      private Response(com.google.protobuf.GeneratedMessageV3.Builder builder) {
+        super(builder);
+      }
+      private Response() {
+      }
+
+      @java.lang.Override
+      @SuppressWarnings({"unused"})
+      protected java.lang.Object newInstance(
+          UnusedPrivateParameter unused) {
+        return new Response();
+      }
+
+      public static final com.google.protobuf.Descriptors.Descriptor
+          getDescriptor() {
+        return org.vdaas.vald.api.v1.payload.ValdPayload.internal_static_payload_v1_Object_List_Response_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return org.vdaas.vald.api.v1.payload.ValdPayload.internal_static_payload_v1_Object_List_Response_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                org.vdaas.vald.api.v1.payload.Object.List.Response.class, org.vdaas.vald.api.v1.payload.Object.List.Response.Builder.class);
+      }
+
+      private int payloadCase_ = 0;
+      @SuppressWarnings("serial")
+      private java.lang.Object payload_;
+      public enum PayloadCase
+          implements com.google.protobuf.Internal.EnumLite,
+              com.google.protobuf.AbstractMessage.InternalOneOfEnum {
+        VECTOR(1),
+        STATUS(2),
+        PAYLOAD_NOT_SET(0);
+        private final int value;
+        private PayloadCase(int value) {
+          this.value = value;
+        }
+        /**
+         * @param value The number of the enum to look for.
+         * @return The enum associated with the given number.
+         * @deprecated Use {@link #forNumber(int)} instead.
+         */
+        @java.lang.Deprecated
+        public static PayloadCase valueOf(int value) {
+          return forNumber(value);
+        }
+
+        public static PayloadCase forNumber(int value) {
+          switch (value) {
+            case 1: return VECTOR;
+            case 2: return STATUS;
+            case 0: return PAYLOAD_NOT_SET;
+            default: return null;
+          }
+        }
+        public int getNumber() {
+          return this.value;
+        }
+      };
+
+      public PayloadCase
+      getPayloadCase() {
+        return PayloadCase.forNumber(
+            payloadCase_);
+      }
+
+      public static final int VECTOR_FIELD_NUMBER = 1;
+      /**
+       * 
+       * The vector
+       * 

+       *
+       * .payload.v1.Object.Vector vector = 1;
+       * @return Whether the vector field is set.
+       */
+      @java.lang.Override
+      public boolean hasVector() {
+        return payloadCase_ == 1;
+      }
+      /**
+       * 
+       * The vector
+       * 

+       *
+       * .payload.v1.Object.Vector vector = 1;
+       * @return The vector.
+       */
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.payload.Object.Vector getVector() {
+        if (payloadCase_ == 1) {
+           return (org.vdaas.vald.api.v1.payload.Object.Vector) payload_;
+        }
+        return org.vdaas.vald.api.v1.payload.Object.Vector.getDefaultInstance();
+      }
+      /**
+       * 
+       * The vector
+       * 

+       *
+       * .payload.v1.Object.Vector vector = 1;
+       */
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.payload.Object.VectorOrBuilder getVectorOrBuilder() {
+        if (payloadCase_ == 1) {
+           return (org.vdaas.vald.api.v1.payload.Object.Vector) payload_;
+        }
+        return org.vdaas.vald.api.v1.payload.Object.Vector.getDefaultInstance();
+      }
+
+      public static final int STATUS_FIELD_NUMBER = 2;
+      /**
+       * 
+       * The RPC error status.
+       * 

+       *
+       * .google.rpc.Status status = 2;
+       * @return Whether the status field is set.
+       */
+      @java.lang.Override
+      public boolean hasStatus() {
+        return payloadCase_ == 2;
+      }
+      /**
+       * 
+       * The RPC error status.
+       * 

+       *
+       * .google.rpc.Status status = 2;
+       * @return The status.
+       */
+      @java.lang.Override
+      public com.google.rpc.Status getStatus() {
+        if (payloadCase_ == 2) {
+           return (com.google.rpc.Status) payload_;
+        }
+        return com.google.rpc.Status.getDefaultInstance();
+      }
+      /**
+       * 
+       * The RPC error status.
+       * 

+       *
+       * .google.rpc.Status status = 2;
+       */
+      @java.lang.Override
+      public com.google.rpc.StatusOrBuilder getStatusOrBuilder() {
+        if (payloadCase_ == 2) {
+           return (com.google.rpc.Status) payload_;
+        }
+        return com.google.rpc.Status.getDefaultInstance();
+      }
+
+      private byte memoizedIsInitialized = -1;
+      @java.lang.Override
+      public final boolean isInitialized() {
+        byte isInitialized = memoizedIsInitialized;
+        if (isInitialized == 1) return true;
+        if (isInitialized == 0) return false;
+
+        memoizedIsInitialized = 1;
+        return true;
+      }
+
+      @java.lang.Override
+      public void writeTo(com.google.protobuf.CodedOutputStream output)
+                          throws java.io.IOException {
+        if (payloadCase_ == 1) {
+          output.writeMessage(1, (org.vdaas.vald.api.v1.payload.Object.Vector) payload_);
+        }
+        if (payloadCase_ == 2) {
+          output.writeMessage(2, (com.google.rpc.Status) payload_);
+        }
+        getUnknownFields().writeTo(output);
+      }
+
+      @java.lang.Override
+      public int getSerializedSize() {
+        int size = memoizedSize;
+        if (size != -1) return size;
+
+        size = 0;
+        if (payloadCase_ == 1) {
+          size += com.google.protobuf.CodedOutputStream
+            .computeMessageSize(1, (org.vdaas.vald.api.v1.payload.Object.Vector) payload_);
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+        if (payloadCase_ == 2) {
+          size += com.google.protobuf.CodedOutputStream
+            .computeMessageSize(2, (com.google.rpc.Status) payload_);
+        }
+        size += getUnknownFields().getSerializedSize();
+        memoizedSize = size;
+        return size;
+      }
+
+      @java.lang.Override
+      public boolean equals(final java.lang.Object obj) {
+        if (obj == this) {
+         return true;
+        }
+        if (!(obj instanceof org.vdaas.vald.api.v1.payload.Object.List.Response)) {
+          return super.equals(obj);
+        }
+        org.vdaas.vald.api.v1.payload.Object.List.Response other = (org.vdaas.vald.api.v1.payload.Object.List.Response) obj;
+
+        if (!getPayloadCase().equals(other.getPayloadCase())) return false;
+        switch (payloadCase_) {
+          case 1:
+            if (!getVector()
+                .equals(other.getVector())) return false;
+            break;
+          case 2:
+            if (!getStatus()
+                .equals(other.getStatus())) return false;
+            break;
+          case 0:
+          default:
+        }
+        if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+        return true;
+      }
+
+      @java.lang.Override
+      public int hashCode() {
+        if (memoizedHashCode != 0) {
+          return memoizedHashCode;
+        }
+        int hash = 41;
+        hash = (19 * hash) + getDescriptor().hashCode();
+        switch (payloadCase_) {
+          case 1:
+            hash = (37 * hash) + VECTOR_FIELD_NUMBER;
+            hash = (53 * hash) + getVector().hashCode();
+            break;
+          case 2:
+            hash = (37 * hash) + STATUS_FIELD_NUMBER;
+            hash = (53 * hash) + getStatus().hashCode();
+            break;
+          case 0:
+          default:
+        }
+        hash = (29 * hash) + getUnknownFields().hashCode();
+        memoizedHashCode = hash;
+        return hash;
+      }
+
+      public static org.vdaas.vald.api.v1.payload.Object.List.Response parseFrom(
+          java.nio.ByteBuffer data)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        return PARSER.parseFrom(data);
+      }
+      public static org.vdaas.vald.api.v1.payload.Object.List.Response parseFrom(
+          java.nio.ByteBuffer data,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        return PARSER.parseFrom(data, extensionRegistry);
+      }
+      public static org.vdaas.vald.api.v1.payload.Object.List.Response parseFrom(
+          com.google.protobuf.ByteString data)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        return PARSER.parseFrom(data);
+      }
+      public static org.vdaas.vald.api.v1.payload.Object.List.Response parseFrom(
+          com.google.protobuf.ByteString data,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        return PARSER.parseFrom(data, extensionRegistry);
+      }
+      public static org.vdaas.vald.api.v1.payload.Object.List.Response parseFrom(byte[] data)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        return PARSER.parseFrom(data);
+      }
+      public static org.vdaas.vald.api.v1.payload.Object.List.Response parseFrom(
+          byte[] data,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        return PARSER.parseFrom(data, extensionRegistry);
+      }
+      public static org.vdaas.vald.api.v1.payload.Object.List.Response parseFrom(java.io.InputStream input)
+          throws java.io.IOException {
+        return com.google.protobuf.GeneratedMessageV3
+            .parseWithIOException(PARSER, input);
+      }
+      public static org.vdaas.vald.api.v1.payload.Object.List.Response parseFrom(
+          java.io.InputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        return com.google.protobuf.GeneratedMessageV3
+            .parseWithIOException(PARSER, input, extensionRegistry);
+      }
+
+      public static org.vdaas.vald.api.v1.payload.Object.List.Response parseDelimitedFrom(java.io.InputStream input)
+          throws java.io.IOException {
+        return com.google.protobuf.GeneratedMessageV3
+            .parseDelimitedWithIOException(PARSER, input);
+      }
+
+      public static org.vdaas.vald.api.v1.payload.Object.List.Response parseDelimitedFrom(
+          java.io.InputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        return com.google.protobuf.GeneratedMessageV3
+            .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
+      }
+      public static org.vdaas.vald.api.v1.payload.Object.List.Response parseFrom(
+          com.google.protobuf.CodedInputStream input)
+          throws java.io.IOException {
+        return com.google.protobuf.GeneratedMessageV3
+            .parseWithIOException(PARSER, input);
+      }
+      public static org.vdaas.vald.api.v1.payload.Object.List.Response parseFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        return com.google.protobuf.GeneratedMessageV3
+            .parseWithIOException(PARSER, input, extensionRegistry);
+      }
+
+      @java.lang.Override
+      public Builder newBuilderForType() { return newBuilder(); }
+      public static Builder newBuilder() {
+        return DEFAULT_INSTANCE.toBuilder();
+      }
+      public static Builder newBuilder(org.vdaas.vald.api.v1.payload.Object.List.Response prototype) {
+        return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+      }
+      @java.lang.Override
+      public Builder toBuilder() {
+        return this == DEFAULT_INSTANCE
+            ? new Builder() : new Builder().mergeFrom(this);
+      }
+
+      @java.lang.Override
+      protected Builder newBuilderForType(
+          com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+        Builder builder = new Builder(parent);
+        return builder;
+      }
+      /**
+       * Protobuf type {@code payload.v1.Object.List.Response}
+       */
+      public static final class Builder extends
+          com.google.protobuf.GeneratedMessageV3.Builder implements
+          // @@protoc_insertion_point(builder_implements:payload.v1.Object.List.Response)
+          org.vdaas.vald.api.v1.payload.Object.List.ResponseOrBuilder {
+        public static final com.google.protobuf.Descriptors.Descriptor
+            getDescriptor() {
+          return org.vdaas.vald.api.v1.payload.ValdPayload.internal_static_payload_v1_Object_List_Response_descriptor;
+        }
+
+        @java.lang.Override
+        protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+            internalGetFieldAccessorTable() {
+          return org.vdaas.vald.api.v1.payload.ValdPayload.internal_static_payload_v1_Object_List_Response_fieldAccessorTable
+              .ensureFieldAccessorsInitialized(
+                  org.vdaas.vald.api.v1.payload.Object.List.Response.class, org.vdaas.vald.api.v1.payload.Object.List.Response.Builder.class);
+        }
+
+        // Construct using org.vdaas.vald.api.v1.payload.Object.List.Response.newBuilder()
+        private Builder() {
+
+        }
+
+        private Builder(
+            com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+          super(parent);
+
+        }
+        @java.lang.Override
+        public Builder clear() {
+          super.clear();
+          bitField0_ = 0;
+          if (vectorBuilder_ != null) {
+            vectorBuilder_.clear();
+          }
+          if (statusBuilder_ != null) {
+            statusBuilder_.clear();
+          }
+          payloadCase_ = 0;
+          payload_ = null;
+          return this;
+        }
+
+        @java.lang.Override
+        public com.google.protobuf.Descriptors.Descriptor
+            getDescriptorForType() {
+          return org.vdaas.vald.api.v1.payload.ValdPayload.internal_static_payload_v1_Object_List_Response_descriptor;
+        }
+
+        @java.lang.Override
+        public org.vdaas.vald.api.v1.payload.Object.List.Response getDefaultInstanceForType() {
+          return org.vdaas.vald.api.v1.payload.Object.List.Response.getDefaultInstance();
+        }
+
+        @java.lang.Override
+        public org.vdaas.vald.api.v1.payload.Object.List.Response build() {
+          org.vdaas.vald.api.v1.payload.Object.List.Response result = buildPartial();
+          if (!result.isInitialized()) {
+            throw newUninitializedMessageException(result);
+          }
+          return result;
+        }
+
+        @java.lang.Override
+        public org.vdaas.vald.api.v1.payload.Object.List.Response buildPartial() {
+          org.vdaas.vald.api.v1.payload.Object.List.Response result = new org.vdaas.vald.api.v1.payload.Object.List.Response(this);
+          if (bitField0_ != 0) { buildPartial0(result); }
+          buildPartialOneofs(result);
+          onBuilt();
+          return result;
+        }
+
+        private void buildPartial0(org.vdaas.vald.api.v1.payload.Object.List.Response result) {
+          int from_bitField0_ = bitField0_;
+        }
+
+        private void buildPartialOneofs(org.vdaas.vald.api.v1.payload.Object.List.Response result) {
+          result.payloadCase_ = payloadCase_;
+          result.payload_ = this.payload_;
+          if (payloadCase_ == 1 &&
+              vectorBuilder_ != null) {
+            result.payload_ = vectorBuilder_.build();
+          }
+          if (payloadCase_ == 2 &&
+              statusBuilder_ != null) {
+            result.payload_ = statusBuilder_.build();
+          }
+        }
+
+        @java.lang.Override
+        public Builder clone() {
+          return super.clone();
+        }
+        @java.lang.Override
+        public Builder setField(
+            com.google.protobuf.Descriptors.FieldDescriptor field,
+            java.lang.Object value) {
+          return super.setField(field, value);
+        }
+        @java.lang.Override
+        public Builder clearField(
+            com.google.protobuf.Descriptors.FieldDescriptor field) {
+          return super.clearField(field);
+        }
+        @java.lang.Override
+        public Builder clearOneof(
+            com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+          return super.clearOneof(oneof);
+        }
+        @java.lang.Override
+        public Builder setRepeatedField(
+            com.google.protobuf.Descriptors.FieldDescriptor field,
+            int index, java.lang.Object value) {
+          return super.setRepeatedField(field, index, value);
+        }
+        @java.lang.Override
+        public Builder addRepeatedField(
+            com.google.protobuf.Descriptors.FieldDescriptor field,
+            java.lang.Object value) {
+          return super.addRepeatedField(field, value);
+        }
+        @java.lang.Override
+        public Builder mergeFrom(com.google.protobuf.Message other) {
+          if (other instanceof org.vdaas.vald.api.v1.payload.Object.List.Response) {
+            return mergeFrom((org.vdaas.vald.api.v1.payload.Object.List.Response)other);
+          } else {
+            super.mergeFrom(other);
+            return this;
+          }
+        }
+
+        public Builder mergeFrom(org.vdaas.vald.api.v1.payload.Object.List.Response other) {
+          if (other == org.vdaas.vald.api.v1.payload.Object.List.Response.getDefaultInstance()) return this;
+          switch (other.getPayloadCase()) {
+            case VECTOR: {
+              mergeVector(other.getVector());
+              break;
+            }
+            case STATUS: {
+              mergeStatus(other.getStatus());
+              break;
+            }
+            case PAYLOAD_NOT_SET: {
+              break;
+            }
+          }
+          this.mergeUnknownFields(other.getUnknownFields());
+          onChanged();
+          return this;
+        }
+
+        @java.lang.Override
+        public final boolean isInitialized() {
+          return true;
+        }
+
+        @java.lang.Override
+        public Builder mergeFrom(
+            com.google.protobuf.CodedInputStream input,
+            com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+            throws java.io.IOException {
+          if (extensionRegistry == null) {
+            throw new java.lang.NullPointerException();
+          }
+          try {
+            boolean done = false;
+            while (!done) {
+              int tag = input.readTag();
+              switch (tag) {
+                case 0:
+                  done = true;
+                  break;
+                case 10: {
+                  input.readMessage(
+                      getVectorFieldBuilder().getBuilder(),
+                      extensionRegistry);
+                  payloadCase_ = 1;
+                  break;
+                } // case 10
+                case 18: {
+                  input.readMessage(
+                      getStatusFieldBuilder().getBuilder(),
+                      extensionRegistry);
+                  payloadCase_ = 2;
+                  break;
+                } // case 18
+                default: {
+                  if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                    done = true; // was an endgroup tag
+                  }
+                  break;
+                } // default:
+              } // switch (tag)
+            } // while (!done)
+          } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+            throw e.unwrapIOException();
+          } finally {
+            onChanged();
+          } // finally
+          return this;
+        }
+        private int payloadCase_ = 0;
+        private java.lang.Object payload_;
+        public PayloadCase
+            getPayloadCase() {
+          return PayloadCase.forNumber(
+              payloadCase_);
+        }
+
+        public Builder clearPayload() {
+          payloadCase_ = 0;
+          payload_ = null;
+          onChanged();
+          return this;
+        }
+
+        private int bitField0_;
+
+        private com.google.protobuf.SingleFieldBuilderV3<
+            org.vdaas.vald.api.v1.payload.Object.Vector, org.vdaas.vald.api.v1.payload.Object.Vector.Builder, org.vdaas.vald.api.v1.payload.Object.VectorOrBuilder> vectorBuilder_;
+        /**
+         * 
+         * The vector
+         * 

+         *
+         * .payload.v1.Object.Vector vector = 1;
+         * @return Whether the vector field is set.
+         */
+        @java.lang.Override
+        public boolean hasVector() {
+          return payloadCase_ == 1;
+        }
+        /**
+         * 
+         * The vector
+         * 

+         *
+         * .payload.v1.Object.Vector vector = 1;
+         * @return The vector.
+         */
+        @java.lang.Override
+        public org.vdaas.vald.api.v1.payload.Object.Vector getVector() {
+          if (vectorBuilder_ == null) {
+            if (payloadCase_ == 1) {
+              return (org.vdaas.vald.api.v1.payload.Object.Vector) payload_;
+            }
+            return org.vdaas.vald.api.v1.payload.Object.Vector.getDefaultInstance();
+          } else {
+            if (payloadCase_ == 1) {
+              return vectorBuilder_.getMessage();
+            }
+            return org.vdaas.vald.api.v1.payload.Object.Vector.getDefaultInstance();
+          }
+        }
+        /**
+         * 
+         * The vector
+         * 

+         *
+         * .payload.v1.Object.Vector vector = 1;
+         */
+        public Builder setVector(org.vdaas.vald.api.v1.payload.Object.Vector value) {
+          if (vectorBuilder_ == null) {
+            if (value == null) {
+              throw new NullPointerException();
+            }
+            payload_ = value;
+            onChanged();
+          } else {
+            vectorBuilder_.setMessage(value);
+          }
+          payloadCase_ = 1;
+          return this;
+        }
+        /**
+         * 
+         * The vector
+         * 

+         *
+         * .payload.v1.Object.Vector vector = 1;
+         */
+        public Builder setVector(
+            org.vdaas.vald.api.v1.payload.Object.Vector.Builder builderForValue) {
+          if (vectorBuilder_ == null) {
+            payload_ = builderForValue.build();
+            onChanged();
+          } else {
+            vectorBuilder_.setMessage(builderForValue.build());
+          }
+          payloadCase_ = 1;
+          return this;
+        }
+        /**
+         * 
+         * The vector
+         * 

+         *
+         * .payload.v1.Object.Vector vector = 1;
+         */
+        public Builder mergeVector(org.vdaas.vald.api.v1.payload.Object.Vector value) {
+          if (vectorBuilder_ == null) {
+            if (payloadCase_ == 1 &&
+                payload_ != org.vdaas.vald.api.v1.payload.Object.Vector.getDefaultInstance()) {
+              payload_ = org.vdaas.vald.api.v1.payload.Object.Vector.newBuilder((org.vdaas.vald.api.v1.payload.Object.Vector) payload_)
+                  .mergeFrom(value).buildPartial();
+            } else {
+              payload_ = value;
+            }
+            onChanged();
+          } else {
+            if (payloadCase_ == 1) {
+              vectorBuilder_.mergeFrom(value);
+            } else {
+              vectorBuilder_.setMessage(value);
+            }
+          }
+          payloadCase_ = 1;
+          return this;
+        }
+        /**
+         * 
+         * The vector
+         * 

+         *
+         * .payload.v1.Object.Vector vector = 1;
+         */
+        public Builder clearVector() {
+          if (vectorBuilder_ == null) {
+            if (payloadCase_ == 1) {
+              payloadCase_ = 0;
+              payload_ = null;
+              onChanged();
+            }
+          } else {
+            if (payloadCase_ == 1) {
+              payloadCase_ = 0;
+              payload_ = null;
+            }
+            vectorBuilder_.clear();
+          }
+          return this;
+        }
+        /**
+         * 
+         * The vector
+         * 

+         *
+         * .payload.v1.Object.Vector vector = 1;
+         */
+        public org.vdaas.vald.api.v1.payload.Object.Vector.Builder getVectorBuilder() {
+          return getVectorFieldBuilder().getBuilder();
+        }
+        /**
+         * 
+         * The vector
+         * 

+         *
+         * .payload.v1.Object.Vector vector = 1;
+         */
+        @java.lang.Override
+        public org.vdaas.vald.api.v1.payload.Object.VectorOrBuilder getVectorOrBuilder() {
+          if ((payloadCase_ == 1) && (vectorBuilder_ != null)) {
+            return vectorBuilder_.getMessageOrBuilder();
+          } else {
+            if (payloadCase_ == 1) {
+              return (org.vdaas.vald.api.v1.payload.Object.Vector) payload_;
+            }
+            return org.vdaas.vald.api.v1.payload.Object.Vector.getDefaultInstance();
+          }
+        }
+        /**
+         * 
+         * The vector
+         * 

+         *
+         * .payload.v1.Object.Vector vector = 1;
+         */
+        private com.google.protobuf.SingleFieldBuilderV3<
+            org.vdaas.vald.api.v1.payload.Object.Vector, org.vdaas.vald.api.v1.payload.Object.Vector.Builder, org.vdaas.vald.api.v1.payload.Object.VectorOrBuilder> 
+            getVectorFieldBuilder() {
+          if (vectorBuilder_ == null) {
+            if (!(payloadCase_ == 1)) {
+              payload_ = org.vdaas.vald.api.v1.payload.Object.Vector.getDefaultInstance();
+            }
+            vectorBuilder_ = new com.google.protobuf.SingleFieldBuilderV3<
+                org.vdaas.vald.api.v1.payload.Object.Vector, org.vdaas.vald.api.v1.payload.Object.Vector.Builder, org.vdaas.vald.api.v1.payload.Object.VectorOrBuilder>(
+                    (org.vdaas.vald.api.v1.payload.Object.Vector) payload_,
+                    getParentForChildren(),
+                    isClean());
+            payload_ = null;
+          }
+          payloadCase_ = 1;
+          onChanged();
+          return vectorBuilder_;
+        }
+
+        private com.google.protobuf.SingleFieldBuilderV3<
+            com.google.rpc.Status, com.google.rpc.Status.Builder, com.google.rpc.StatusOrBuilder> statusBuilder_;
+        /**
+         * 
+         * The RPC error status.
+         * 

+         *
+         * .google.rpc.Status status = 2;
+         * @return Whether the status field is set.
+         */
+        @java.lang.Override
+        public boolean hasStatus() {
+          return payloadCase_ == 2;
+        }
+        /**
+         * 
+         * The RPC error status.
+         * 

+         *
+         * .google.rpc.Status status = 2;
+         * @return The status.
+         */
+        @java.lang.Override
+        public com.google.rpc.Status getStatus() {
+          if (statusBuilder_ == null) {
+            if (payloadCase_ == 2) {
+              return (com.google.rpc.Status) payload_;
+            }
+            return com.google.rpc.Status.getDefaultInstance();
+          } else {
+            if (payloadCase_ == 2) {
+              return statusBuilder_.getMessage();
+            }
+            return com.google.rpc.Status.getDefaultInstance();
+          }
+        }
+        /**
+         * 
+         * The RPC error status.
+         * 

+         *
+         * .google.rpc.Status status = 2;
+         */
+        public Builder setStatus(com.google.rpc.Status value) {
+          if (statusBuilder_ == null) {
+            if (value == null) {
+              throw new NullPointerException();
+            }
+            payload_ = value;
+            onChanged();
+          } else {
+            statusBuilder_.setMessage(value);
+          }
+          payloadCase_ = 2;
+          return this;
+        }
+        /**
+         * 
+         * The RPC error status.
+         * 

+         *
+         * .google.rpc.Status status = 2;
+         */
+        public Builder setStatus(
+            com.google.rpc.Status.Builder builderForValue) {
+          if (statusBuilder_ == null) {
+            payload_ = builderForValue.build();
+            onChanged();
+          } else {
+            statusBuilder_.setMessage(builderForValue.build());
+          }
+          payloadCase_ = 2;
+          return this;
+        }
+        /**
+         * 
+         * The RPC error status.
+         * 

+         *
+         * .google.rpc.Status status = 2;
+         */
+        public Builder mergeStatus(com.google.rpc.Status value) {
+          if (statusBuilder_ == null) {
+            if (payloadCase_ == 2 &&
+                payload_ != com.google.rpc.Status.getDefaultInstance()) {
+              payload_ = com.google.rpc.Status.newBuilder((com.google.rpc.Status) payload_)
+                  .mergeFrom(value).buildPartial();
+            } else {
+              payload_ = value;
+            }
+            onChanged();
+          } else {
+            if (payloadCase_ == 2) {
+              statusBuilder_.mergeFrom(value);
+            } else {
+              statusBuilder_.setMessage(value);
+            }
+          }
+          payloadCase_ = 2;
+          return this;
+        }
+        /**
+         * 
+         * The RPC error status.
+         * 

+         *
+         * .google.rpc.Status status = 2;
+         */
+        public Builder clearStatus() {
+          if (statusBuilder_ == null) {
+            if (payloadCase_ == 2) {
+              payloadCase_ = 0;
+              payload_ = null;
+              onChanged();
+            }
+          } else {
+            if (payloadCase_ == 2) {
+              payloadCase_ = 0;
+              payload_ = null;
+            }
+            statusBuilder_.clear();
+          }
+          return this;
+        }
+        /**
+         * 
+         * The RPC error status.
+         * 

+         *
+         * .google.rpc.Status status = 2;
+         */
+        public com.google.rpc.Status.Builder getStatusBuilder() {
+          return getStatusFieldBuilder().getBuilder();
+        }
+        /**
+         * 
+         * The RPC error status.
+         * 

+         *
+         * .google.rpc.Status status = 2;
+         */
+        @java.lang.Override
+        public com.google.rpc.StatusOrBuilder getStatusOrBuilder() {
+          if ((payloadCase_ == 2) && (statusBuilder_ != null)) {
+            return statusBuilder_.getMessageOrBuilder();
+          } else {
+            if (payloadCase_ == 2) {
+              return (com.google.rpc.Status) payload_;
+            }
+            return com.google.rpc.Status.getDefaultInstance();
+          }
+        }
+        /**
+         * 
+         * The RPC error status.
+         * 

+         *
+         * .google.rpc.Status status = 2;
+         */
+        private com.google.protobuf.SingleFieldBuilderV3<
+            com.google.rpc.Status, com.google.rpc.Status.Builder, com.google.rpc.StatusOrBuilder> 
+            getStatusFieldBuilder() {
+          if (statusBuilder_ == null) {
+            if (!(payloadCase_ == 2)) {
+              payload_ = com.google.rpc.Status.getDefaultInstance();
+            }
+            statusBuilder_ = new com.google.protobuf.SingleFieldBuilderV3<
+                com.google.rpc.Status, com.google.rpc.Status.Builder, com.google.rpc.StatusOrBuilder>(
+                    (com.google.rpc.Status) payload_,
+                    getParentForChildren(),
+                    isClean());
+            payload_ = null;
+          }
+          payloadCase_ = 2;
+          onChanged();
+          return statusBuilder_;
+        }
+        @java.lang.Override
+        public final Builder setUnknownFields(
+            final com.google.protobuf.UnknownFieldSet unknownFields) {
+          return super.setUnknownFields(unknownFields);
+        }
+
+        @java.lang.Override
+        public final Builder mergeUnknownFields(
+            final com.google.protobuf.UnknownFieldSet unknownFields) {
+          return super.mergeUnknownFields(unknownFields);
+        }
+
+
+        // @@protoc_insertion_point(builder_scope:payload.v1.Object.List.Response)
+      }
+
+      // @@protoc_insertion_point(class_scope:payload.v1.Object.List.Response)
+      private static final org.vdaas.vald.api.v1.payload.Object.List.Response DEFAULT_INSTANCE;
+      static {
+        DEFAULT_INSTANCE = new org.vdaas.vald.api.v1.payload.Object.List.Response();
+      }
+
+      public static org.vdaas.vald.api.v1.payload.Object.List.Response getDefaultInstance() {
+        return DEFAULT_INSTANCE;
+      }
+
+      private static final com.google.protobuf.Parser
+          PARSER = new com.google.protobuf.AbstractParser() {
+        @java.lang.Override
+        public Response parsePartialFrom(
+            com.google.protobuf.CodedInputStream input,
+            com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+            throws com.google.protobuf.InvalidProtocolBufferException {
+          Builder builder = newBuilder();
+          try {
+            builder.mergeFrom(input, extensionRegistry);
+          } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+            throw e.setUnfinishedMessage(builder.buildPartial());
+          } catch (com.google.protobuf.UninitializedMessageException e) {
+            throw e.asInvalidProtocolBufferException().setUnfinishedMessage(builder.buildPartial());
+          } catch (java.io.IOException e) {
+            throw new com.google.protobuf.InvalidProtocolBufferException(e)
+                .setUnfinishedMessage(builder.buildPartial());
+          }
+          return builder.buildPartial();
+        }
+      };
+
+      public static com.google.protobuf.Parser parser() {
+        return PARSER;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Parser getParserForType() {
+        return PARSER;
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.payload.Object.List.Response getDefaultInstanceForType() {
+        return DEFAULT_INSTANCE;
+      }
+
+    }
+
+    private byte memoizedIsInitialized = -1;
+    @java.lang.Override
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized == 1) return true;
+      if (isInitialized == 0) return false;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    @java.lang.Override
+    public void writeTo(com.google.protobuf.CodedOutputStream output)
+                        throws java.io.IOException {
+      getUnknownFields().writeTo(output);
+    }
+
+    @java.lang.Override
+    public int getSerializedSize() {
+      int size = memoizedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      size += getUnknownFields().getSerializedSize();
+      memoizedSize = size;
+      return size;
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+       return true;
+      }
+      if (!(obj instanceof org.vdaas.vald.api.v1.payload.Object.List)) {
+        return super.equals(obj);
+      }
+      org.vdaas.vald.api.v1.payload.Object.List other = (org.vdaas.vald.api.v1.payload.Object.List) obj;
+
+      if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+      return true;
+    }
+
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      hash = (29 * hash) + getUnknownFields().hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static org.vdaas.vald.api.v1.payload.Object.List parseFrom(
+        java.nio.ByteBuffer data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.vdaas.vald.api.v1.payload.Object.List parseFrom(
+        java.nio.ByteBuffer data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.payload.Object.List parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.vdaas.vald.api.v1.payload.Object.List parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.payload.Object.List parseFrom(byte[] data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.vdaas.vald.api.v1.payload.Object.List parseFrom(
+        byte[] data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.payload.Object.List parseFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input);
+    }
+    public static org.vdaas.vald.api.v1.payload.Object.List parseFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input, extensionRegistry);
+    }
+
+    public static org.vdaas.vald.api.v1.payload.Object.List parseDelimitedFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseDelimitedWithIOException(PARSER, input);
+    }
+
+    public static org.vdaas.vald.api.v1.payload.Object.List parseDelimitedFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.payload.Object.List parseFrom(
+        com.google.protobuf.CodedInputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input);
+    }
+    public static org.vdaas.vald.api.v1.payload.Object.List parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() { return newBuilder(); }
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+    public static Builder newBuilder(org.vdaas.vald.api.v1.payload.Object.List prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE
+          ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+    /**
+     * 
+     * Represent the list object vector stream request and response.
+     * 

+     *
+     * Protobuf type {@code payload.v1.Object.List}
+     */
+    public static final class Builder extends
+        com.google.protobuf.GeneratedMessageV3.Builder implements
+        // @@protoc_insertion_point(builder_implements:payload.v1.Object.List)
+        org.vdaas.vald.api.v1.payload.Object.ListOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor
+          getDescriptor() {
+        return org.vdaas.vald.api.v1.payload.ValdPayload.internal_static_payload_v1_Object_List_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return org.vdaas.vald.api.v1.payload.ValdPayload.internal_static_payload_v1_Object_List_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                org.vdaas.vald.api.v1.payload.Object.List.class, org.vdaas.vald.api.v1.payload.Object.List.Builder.class);
+      }
+
+      // Construct using org.vdaas.vald.api.v1.payload.Object.List.newBuilder()
+      private Builder() {
+
+      }
+
+      private Builder(
+          com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+        super(parent);
+
+      }
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        return this;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor
+          getDescriptorForType() {
+        return org.vdaas.vald.api.v1.payload.ValdPayload.internal_static_payload_v1_Object_List_descriptor;
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.payload.Object.List getDefaultInstanceForType() {
+        return org.vdaas.vald.api.v1.payload.Object.List.getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.payload.Object.List build() {
+        org.vdaas.vald.api.v1.payload.Object.List result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.payload.Object.List buildPartial() {
+        org.vdaas.vald.api.v1.payload.Object.List result = new org.vdaas.vald.api.v1.payload.Object.List(this);
+        onBuilt();
+        return result;
+      }
+
+      @java.lang.Override
+      public Builder clone() {
+        return super.clone();
+      }
+      @java.lang.Override
+      public Builder setField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          java.lang.Object value) {
+        return super.setField(field, value);
+      }
+      @java.lang.Override
+      public Builder clearField(
+          com.google.protobuf.Descriptors.FieldDescriptor field) {
+        return super.clearField(field);
+      }
+      @java.lang.Override
+      public Builder clearOneof(
+          com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+        return super.clearOneof(oneof);
+      }
+      @java.lang.Override
+      public Builder setRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          int index, java.lang.Object value) {
+        return super.setRepeatedField(field, index, value);
+      }
+      @java.lang.Override
+      public Builder addRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          java.lang.Object value) {
+        return super.addRepeatedField(field, value);
+      }
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof org.vdaas.vald.api.v1.payload.Object.List) {
+          return mergeFrom((org.vdaas.vald.api.v1.payload.Object.List)other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(org.vdaas.vald.api.v1.payload.Object.List other) {
+        if (other == org.vdaas.vald.api.v1.payload.Object.List.getDefaultInstance()) return this;
+        this.mergeUnknownFields(other.getUnknownFields());
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        if (extensionRegistry == null) {
+          throw new java.lang.NullPointerException();
+        }
+        try {
+          boolean done = false;
+          while (!done) {
+            int tag = input.readTag();
+            switch (tag) {
+              case 0:
+                done = true;
+                break;
+              default: {
+                if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                  done = true; // was an endgroup tag
+                }
+                break;
+              } // default:
+            } // switch (tag)
+          } // while (!done)
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          throw e.unwrapIOException();
+        } finally {
+          onChanged();
+        } // finally
+        return this;
+      }
+      @java.lang.Override
+      public final Builder setUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.setUnknownFields(unknownFields);
+      }
+
+      @java.lang.Override
+      public final Builder mergeUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.mergeUnknownFields(unknownFields);
+      }
+
+
+      // @@protoc_insertion_point(builder_scope:payload.v1.Object.List)
+    }
+
+    // @@protoc_insertion_point(class_scope:payload.v1.Object.List)
+    private static final org.vdaas.vald.api.v1.payload.Object.List DEFAULT_INSTANCE;
+    static {
+      DEFAULT_INSTANCE = new org.vdaas.vald.api.v1.payload.Object.List();
+    }
+
+    public static org.vdaas.vald.api.v1.payload.Object.List getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser
+        PARSER = new com.google.protobuf.AbstractParser() {
+      @java.lang.Override
+      public List parsePartialFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        Builder builder = newBuilder();
+        try {
+          builder.mergeFrom(input, extensionRegistry);
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          throw e.setUnfinishedMessage(builder.buildPartial());
+        } catch (com.google.protobuf.UninitializedMessageException e) {
+          throw e.asInvalidProtocolBufferException().setUnfinishedMessage(builder.buildPartial());
+        } catch (java.io.IOException e) {
+          throw new com.google.protobuf.InvalidProtocolBufferException(e)
+              .setUnfinishedMessage(builder.buildPartial());
+        }
+        return builder.buildPartial();
+      }
+    };
+
+    public static com.google.protobuf.Parser parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.payload.Object.List getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+
+  }
+
   private byte memoizedIsInitialized = -1;
   @java.lang.Override
   public final boolean isInitialized() {
diff --git a/src/main/java/org/vdaas/vald/api/v1/payload/Remove.java b/src/main/java/org/vdaas/vald/api/v1/payload/Remove.java
index aa2f04ca..893eb1bb 100644
--- a/src/main/java/org/vdaas/vald/api/v1/payload/Remove.java
+++ b/src/main/java/org/vdaas/vald/api/v1/payload/Remove.java
@@ -139,6 +139,7 @@ protected java.lang.Object newInstance(
               org.vdaas.vald.api.v1.payload.Remove.Request.class, org.vdaas.vald.api.v1.payload.Remove.Request.Builder.class);
     }
 
+    private int bitField0_;
     public static final int ID_FIELD_NUMBER = 1;
     private org.vdaas.vald.api.v1.payload.Object.ID id_;
     /**
@@ -151,7 +152,7 @@ protected java.lang.Object newInstance(
      */
     @java.lang.Override
     public boolean hasId() {
-      return id_ != null;
+      return ((bitField0_ & 0x00000001) != 0);
     }
     /**
      * 
@@ -189,7 +190,7 @@ public org.vdaas.vald.api.v1.payload.Object.IDOrBuilder getIdOrBuilder() {
      */
     @java.lang.Override
     public boolean hasConfig() {
-      return config_ != null;
+      return ((bitField0_ & 0x00000002) != 0);
     }
     /**
      * 
@@ -229,10 +230,10 @@ public final boolean isInitialized() {
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output)
                         throws java.io.IOException {
-      if (id_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         output.writeMessage(1, getId());
       }
-      if (config_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         output.writeMessage(2, getConfig());
       }
       getUnknownFields().writeTo(output);
@@ -244,11 +245,11 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (id_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(1, getId());
       }
-      if (config_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(2, getConfig());
       }
@@ -419,13 +420,20 @@ public static final class Builder extends
 
       // Construct using org.vdaas.vald.api.v1.payload.Remove.Request.newBuilder()
       private Builder() {
-
+        maybeForceBuilderInitialization();
       }
 
       private Builder(
           com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
         super(parent);
-
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3
+                .alwaysUseFieldBuilders) {
+          getIdFieldBuilder();
+          getConfigFieldBuilder();
+        }
       }
       @java.lang.Override
       public Builder clear() {
@@ -474,16 +482,20 @@ public org.vdaas.vald.api.v1.payload.Remove.Request buildPartial() {
 
       private void buildPartial0(org.vdaas.vald.api.v1.payload.Remove.Request result) {
         int from_bitField0_ = bitField0_;
+        int to_bitField0_ = 0;
         if (((from_bitField0_ & 0x00000001) != 0)) {
           result.id_ = idBuilder_ == null
               ? id_
               : idBuilder_.build();
+          to_bitField0_ |= 0x00000001;
         }
         if (((from_bitField0_ & 0x00000002) != 0)) {
           result.config_ = configBuilder_ == null
               ? config_
               : configBuilder_.build();
+          to_bitField0_ |= 0x00000002;
         }
+        result.bitField0_ |= to_bitField0_;
       }
 
       @java.lang.Override
@@ -679,8 +691,10 @@ public Builder mergeId(org.vdaas.vald.api.v1.payload.Object.ID value) {
         } else {
           idBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000001;
-        onChanged();
+        if (id_ != null) {
+          bitField0_ |= 0x00000001;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -834,8 +848,10 @@ public Builder mergeConfig(org.vdaas.vald.api.v1.payload.Remove.Config value) {
         } else {
           configBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000002;
-        onChanged();
+        if (config_ != null) {
+          bitField0_ |= 0x00000002;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -1868,6 +1884,1694 @@ public org.vdaas.vald.api.v1.payload.Remove.MultiRequest getDefaultInstanceForTy
 
   }
 
+  public interface TimestampRequestOrBuilder extends
+      // @@protoc_insertion_point(interface_extends:payload.v1.Remove.TimestampRequest)
+      com.google.protobuf.MessageOrBuilder {
+
+    /**
+     * 
+     * Represent the multiple remove request contents based on timestamp.
+     * 

+     *
+     * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+     */
+    java.util.List 
+        getTimestampsList();
+    /**
+     * 
+     * Represent the multiple remove request contents based on timestamp.
+     * 

+     *
+     * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+     */
+    org.vdaas.vald.api.v1.payload.Remove.Timestamp getTimestamps(int index);
+    /**
+     * 
+     * Represent the multiple remove request contents based on timestamp.
+     * 

+     *
+     * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+     */
+    int getTimestampsCount();
+    /**
+     * 
+     * Represent the multiple remove request contents based on timestamp.
+     * 

+     *
+     * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+     */
+    java.util.List 
+        getTimestampsOrBuilderList();
+    /**
+     * 
+     * Represent the multiple remove request contents based on timestamp.
+     * 

+     *
+     * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+     */
+    org.vdaas.vald.api.v1.payload.Remove.TimestampOrBuilder getTimestampsOrBuilder(
+        int index);
+  }
+  /**
+   * 
+   * Represent the remove request based on timestamp.
+   * 

+   *
+   * Protobuf type {@code payload.v1.Remove.TimestampRequest}
+   */
+  public static final class TimestampRequest extends
+      com.google.protobuf.GeneratedMessageV3 implements
+      // @@protoc_insertion_point(message_implements:payload.v1.Remove.TimestampRequest)
+      TimestampRequestOrBuilder {
+  private static final long serialVersionUID = 0L;
+    // Use TimestampRequest.newBuilder() to construct.
+    private TimestampRequest(com.google.protobuf.GeneratedMessageV3.Builder builder) {
+      super(builder);
+    }
+    private TimestampRequest() {
+      timestamps_ = java.util.Collections.emptyList();
+    }
+
+    @java.lang.Override
+    @SuppressWarnings({"unused"})
+    protected java.lang.Object newInstance(
+        UnusedPrivateParameter unused) {
+      return new TimestampRequest();
+    }
+
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return org.vdaas.vald.api.v1.payload.ValdPayload.internal_static_payload_v1_Remove_TimestampRequest_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return org.vdaas.vald.api.v1.payload.ValdPayload.internal_static_payload_v1_Remove_TimestampRequest_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              org.vdaas.vald.api.v1.payload.Remove.TimestampRequest.class, org.vdaas.vald.api.v1.payload.Remove.TimestampRequest.Builder.class);
+    }
+
+    public static final int TIMESTAMPS_FIELD_NUMBER = 1;
+    @SuppressWarnings("serial")
+    private java.util.List timestamps_;
+    /**
+     * 
+     * Represent the multiple remove request contents based on timestamp.
+     * 

+     *
+     * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+     */
+    @java.lang.Override
+    public java.util.List getTimestampsList() {
+      return timestamps_;
+    }
+    /**
+     * 
+     * Represent the multiple remove request contents based on timestamp.
+     * 

+     *
+     * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+     */
+    @java.lang.Override
+    public java.util.List 
+        getTimestampsOrBuilderList() {
+      return timestamps_;
+    }
+    /**
+     * 
+     * Represent the multiple remove request contents based on timestamp.
+     * 

+     *
+     * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+     */
+    @java.lang.Override
+    public int getTimestampsCount() {
+      return timestamps_.size();
+    }
+    /**
+     * 
+     * Represent the multiple remove request contents based on timestamp.
+     * 

+     *
+     * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+     */
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.payload.Remove.Timestamp getTimestamps(int index) {
+      return timestamps_.get(index);
+    }
+    /**
+     * 
+     * Represent the multiple remove request contents based on timestamp.
+     * 

+     *
+     * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+     */
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.payload.Remove.TimestampOrBuilder getTimestampsOrBuilder(
+        int index) {
+      return timestamps_.get(index);
+    }
+
+    private byte memoizedIsInitialized = -1;
+    @java.lang.Override
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized == 1) return true;
+      if (isInitialized == 0) return false;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    @java.lang.Override
+    public void writeTo(com.google.protobuf.CodedOutputStream output)
+                        throws java.io.IOException {
+      for (int i = 0; i < timestamps_.size(); i++) {
+        output.writeMessage(1, timestamps_.get(i));
+      }
+      getUnknownFields().writeTo(output);
+    }
+
+    @java.lang.Override
+    public int getSerializedSize() {
+      int size = memoizedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      for (int i = 0; i < timestamps_.size(); i++) {
+        size += com.google.protobuf.CodedOutputStream
+          .computeMessageSize(1, timestamps_.get(i));
+      }
+      size += getUnknownFields().getSerializedSize();
+      memoizedSize = size;
+      return size;
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+       return true;
+      }
+      if (!(obj instanceof org.vdaas.vald.api.v1.payload.Remove.TimestampRequest)) {
+        return super.equals(obj);
+      }
+      org.vdaas.vald.api.v1.payload.Remove.TimestampRequest other = (org.vdaas.vald.api.v1.payload.Remove.TimestampRequest) obj;
+
+      if (!getTimestampsList()
+          .equals(other.getTimestampsList())) return false;
+      if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+      return true;
+    }
+
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      if (getTimestampsCount() > 0) {
+        hash = (37 * hash) + TIMESTAMPS_FIELD_NUMBER;
+        hash = (53 * hash) + getTimestampsList().hashCode();
+      }
+      hash = (29 * hash) + getUnknownFields().hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static org.vdaas.vald.api.v1.payload.Remove.TimestampRequest parseFrom(
+        java.nio.ByteBuffer data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.vdaas.vald.api.v1.payload.Remove.TimestampRequest parseFrom(
+        java.nio.ByteBuffer data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.payload.Remove.TimestampRequest parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.vdaas.vald.api.v1.payload.Remove.TimestampRequest parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.payload.Remove.TimestampRequest parseFrom(byte[] data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.vdaas.vald.api.v1.payload.Remove.TimestampRequest parseFrom(
+        byte[] data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.payload.Remove.TimestampRequest parseFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input);
+    }
+    public static org.vdaas.vald.api.v1.payload.Remove.TimestampRequest parseFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input, extensionRegistry);
+    }
+
+    public static org.vdaas.vald.api.v1.payload.Remove.TimestampRequest parseDelimitedFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseDelimitedWithIOException(PARSER, input);
+    }
+
+    public static org.vdaas.vald.api.v1.payload.Remove.TimestampRequest parseDelimitedFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.payload.Remove.TimestampRequest parseFrom(
+        com.google.protobuf.CodedInputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input);
+    }
+    public static org.vdaas.vald.api.v1.payload.Remove.TimestampRequest parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() { return newBuilder(); }
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+    public static Builder newBuilder(org.vdaas.vald.api.v1.payload.Remove.TimestampRequest prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE
+          ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+    /**
+     * 
+     * Represent the remove request based on timestamp.
+     * 

+     *
+     * Protobuf type {@code payload.v1.Remove.TimestampRequest}
+     */
+    public static final class Builder extends
+        com.google.protobuf.GeneratedMessageV3.Builder implements
+        // @@protoc_insertion_point(builder_implements:payload.v1.Remove.TimestampRequest)
+        org.vdaas.vald.api.v1.payload.Remove.TimestampRequestOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor
+          getDescriptor() {
+        return org.vdaas.vald.api.v1.payload.ValdPayload.internal_static_payload_v1_Remove_TimestampRequest_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return org.vdaas.vald.api.v1.payload.ValdPayload.internal_static_payload_v1_Remove_TimestampRequest_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                org.vdaas.vald.api.v1.payload.Remove.TimestampRequest.class, org.vdaas.vald.api.v1.payload.Remove.TimestampRequest.Builder.class);
+      }
+
+      // Construct using org.vdaas.vald.api.v1.payload.Remove.TimestampRequest.newBuilder()
+      private Builder() {
+
+      }
+
+      private Builder(
+          com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+        super(parent);
+
+      }
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        bitField0_ = 0;
+        if (timestampsBuilder_ == null) {
+          timestamps_ = java.util.Collections.emptyList();
+        } else {
+          timestamps_ = null;
+          timestampsBuilder_.clear();
+        }
+        bitField0_ = (bitField0_ & ~0x00000001);
+        return this;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor
+          getDescriptorForType() {
+        return org.vdaas.vald.api.v1.payload.ValdPayload.internal_static_payload_v1_Remove_TimestampRequest_descriptor;
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.payload.Remove.TimestampRequest getDefaultInstanceForType() {
+        return org.vdaas.vald.api.v1.payload.Remove.TimestampRequest.getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.payload.Remove.TimestampRequest build() {
+        org.vdaas.vald.api.v1.payload.Remove.TimestampRequest result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.payload.Remove.TimestampRequest buildPartial() {
+        org.vdaas.vald.api.v1.payload.Remove.TimestampRequest result = new org.vdaas.vald.api.v1.payload.Remove.TimestampRequest(this);
+        buildPartialRepeatedFields(result);
+        if (bitField0_ != 0) { buildPartial0(result); }
+        onBuilt();
+        return result;
+      }
+
+      private void buildPartialRepeatedFields(org.vdaas.vald.api.v1.payload.Remove.TimestampRequest result) {
+        if (timestampsBuilder_ == null) {
+          if (((bitField0_ & 0x00000001) != 0)) {
+            timestamps_ = java.util.Collections.unmodifiableList(timestamps_);
+            bitField0_ = (bitField0_ & ~0x00000001);
+          }
+          result.timestamps_ = timestamps_;
+        } else {
+          result.timestamps_ = timestampsBuilder_.build();
+        }
+      }
+
+      private void buildPartial0(org.vdaas.vald.api.v1.payload.Remove.TimestampRequest result) {
+        int from_bitField0_ = bitField0_;
+      }
+
+      @java.lang.Override
+      public Builder clone() {
+        return super.clone();
+      }
+      @java.lang.Override
+      public Builder setField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          java.lang.Object value) {
+        return super.setField(field, value);
+      }
+      @java.lang.Override
+      public Builder clearField(
+          com.google.protobuf.Descriptors.FieldDescriptor field) {
+        return super.clearField(field);
+      }
+      @java.lang.Override
+      public Builder clearOneof(
+          com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+        return super.clearOneof(oneof);
+      }
+      @java.lang.Override
+      public Builder setRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          int index, java.lang.Object value) {
+        return super.setRepeatedField(field, index, value);
+      }
+      @java.lang.Override
+      public Builder addRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          java.lang.Object value) {
+        return super.addRepeatedField(field, value);
+      }
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof org.vdaas.vald.api.v1.payload.Remove.TimestampRequest) {
+          return mergeFrom((org.vdaas.vald.api.v1.payload.Remove.TimestampRequest)other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(org.vdaas.vald.api.v1.payload.Remove.TimestampRequest other) {
+        if (other == org.vdaas.vald.api.v1.payload.Remove.TimestampRequest.getDefaultInstance()) return this;
+        if (timestampsBuilder_ == null) {
+          if (!other.timestamps_.isEmpty()) {
+            if (timestamps_.isEmpty()) {
+              timestamps_ = other.timestamps_;
+              bitField0_ = (bitField0_ & ~0x00000001);
+            } else {
+              ensureTimestampsIsMutable();
+              timestamps_.addAll(other.timestamps_);
+            }
+            onChanged();
+          }
+        } else {
+          if (!other.timestamps_.isEmpty()) {
+            if (timestampsBuilder_.isEmpty()) {
+              timestampsBuilder_.dispose();
+              timestampsBuilder_ = null;
+              timestamps_ = other.timestamps_;
+              bitField0_ = (bitField0_ & ~0x00000001);
+              timestampsBuilder_ = 
+                com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders ?
+                   getTimestampsFieldBuilder() : null;
+            } else {
+              timestampsBuilder_.addAllMessages(other.timestamps_);
+            }
+          }
+        }
+        this.mergeUnknownFields(other.getUnknownFields());
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        if (extensionRegistry == null) {
+          throw new java.lang.NullPointerException();
+        }
+        try {
+          boolean done = false;
+          while (!done) {
+            int tag = input.readTag();
+            switch (tag) {
+              case 0:
+                done = true;
+                break;
+              case 10: {
+                org.vdaas.vald.api.v1.payload.Remove.Timestamp m =
+                    input.readMessage(
+                        org.vdaas.vald.api.v1.payload.Remove.Timestamp.parser(),
+                        extensionRegistry);
+                if (timestampsBuilder_ == null) {
+                  ensureTimestampsIsMutable();
+                  timestamps_.add(m);
+                } else {
+                  timestampsBuilder_.addMessage(m);
+                }
+                break;
+              } // case 10
+              default: {
+                if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                  done = true; // was an endgroup tag
+                }
+                break;
+              } // default:
+            } // switch (tag)
+          } // while (!done)
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          throw e.unwrapIOException();
+        } finally {
+          onChanged();
+        } // finally
+        return this;
+      }
+      private int bitField0_;
+
+      private java.util.List timestamps_ =
+        java.util.Collections.emptyList();
+      private void ensureTimestampsIsMutable() {
+        if (!((bitField0_ & 0x00000001) != 0)) {
+          timestamps_ = new java.util.ArrayList(timestamps_);
+          bitField0_ |= 0x00000001;
+         }
+      }
+
+      private com.google.protobuf.RepeatedFieldBuilderV3<
+          org.vdaas.vald.api.v1.payload.Remove.Timestamp, org.vdaas.vald.api.v1.payload.Remove.Timestamp.Builder, org.vdaas.vald.api.v1.payload.Remove.TimestampOrBuilder> timestampsBuilder_;
+
+      /**
+       * 
+       * Represent the multiple remove request contents based on timestamp.
+       * 

+       *
+       * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+       */
+      public java.util.List getTimestampsList() {
+        if (timestampsBuilder_ == null) {
+          return java.util.Collections.unmodifiableList(timestamps_);
+        } else {
+          return timestampsBuilder_.getMessageList();
+        }
+      }
+      /**
+       * 
+       * Represent the multiple remove request contents based on timestamp.
+       * 

+       *
+       * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+       */
+      public int getTimestampsCount() {
+        if (timestampsBuilder_ == null) {
+          return timestamps_.size();
+        } else {
+          return timestampsBuilder_.getCount();
+        }
+      }
+      /**
+       * 
+       * Represent the multiple remove request contents based on timestamp.
+       * 

+       *
+       * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+       */
+      public org.vdaas.vald.api.v1.payload.Remove.Timestamp getTimestamps(int index) {
+        if (timestampsBuilder_ == null) {
+          return timestamps_.get(index);
+        } else {
+          return timestampsBuilder_.getMessage(index);
+        }
+      }
+      /**
+       * 
+       * Represent the multiple remove request contents based on timestamp.
+       * 

+       *
+       * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+       */
+      public Builder setTimestamps(
+          int index, org.vdaas.vald.api.v1.payload.Remove.Timestamp value) {
+        if (timestampsBuilder_ == null) {
+          if (value == null) {
+            throw new NullPointerException();
+          }
+          ensureTimestampsIsMutable();
+          timestamps_.set(index, value);
+          onChanged();
+        } else {
+          timestampsBuilder_.setMessage(index, value);
+        }
+        return this;
+      }
+      /**
+       * 
+       * Represent the multiple remove request contents based on timestamp.
+       * 

+       *
+       * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+       */
+      public Builder setTimestamps(
+          int index, org.vdaas.vald.api.v1.payload.Remove.Timestamp.Builder builderForValue) {
+        if (timestampsBuilder_ == null) {
+          ensureTimestampsIsMutable();
+          timestamps_.set(index, builderForValue.build());
+          onChanged();
+        } else {
+          timestampsBuilder_.setMessage(index, builderForValue.build());
+        }
+        return this;
+      }
+      /**
+       * 
+       * Represent the multiple remove request contents based on timestamp.
+       * 

+       *
+       * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+       */
+      public Builder addTimestamps(org.vdaas.vald.api.v1.payload.Remove.Timestamp value) {
+        if (timestampsBuilder_ == null) {
+          if (value == null) {
+            throw new NullPointerException();
+          }
+          ensureTimestampsIsMutable();
+          timestamps_.add(value);
+          onChanged();
+        } else {
+          timestampsBuilder_.addMessage(value);
+        }
+        return this;
+      }
+      /**
+       * 
+       * Represent the multiple remove request contents based on timestamp.
+       * 

+       *
+       * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+       */
+      public Builder addTimestamps(
+          int index, org.vdaas.vald.api.v1.payload.Remove.Timestamp value) {
+        if (timestampsBuilder_ == null) {
+          if (value == null) {
+            throw new NullPointerException();
+          }
+          ensureTimestampsIsMutable();
+          timestamps_.add(index, value);
+          onChanged();
+        } else {
+          timestampsBuilder_.addMessage(index, value);
+        }
+        return this;
+      }
+      /**
+       * 
+       * Represent the multiple remove request contents based on timestamp.
+       * 

+       *
+       * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+       */
+      public Builder addTimestamps(
+          org.vdaas.vald.api.v1.payload.Remove.Timestamp.Builder builderForValue) {
+        if (timestampsBuilder_ == null) {
+          ensureTimestampsIsMutable();
+          timestamps_.add(builderForValue.build());
+          onChanged();
+        } else {
+          timestampsBuilder_.addMessage(builderForValue.build());
+        }
+        return this;
+      }
+      /**
+       * 
+       * Represent the multiple remove request contents based on timestamp.
+       * 

+       *
+       * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+       */
+      public Builder addTimestamps(
+          int index, org.vdaas.vald.api.v1.payload.Remove.Timestamp.Builder builderForValue) {
+        if (timestampsBuilder_ == null) {
+          ensureTimestampsIsMutable();
+          timestamps_.add(index, builderForValue.build());
+          onChanged();
+        } else {
+          timestampsBuilder_.addMessage(index, builderForValue.build());
+        }
+        return this;
+      }
+      /**
+       * 
+       * Represent the multiple remove request contents based on timestamp.
+       * 

+       *
+       * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+       */
+      public Builder addAllTimestamps(
+          java.lang.Iterable values) {
+        if (timestampsBuilder_ == null) {
+          ensureTimestampsIsMutable();
+          com.google.protobuf.AbstractMessageLite.Builder.addAll(
+              values, timestamps_);
+          onChanged();
+        } else {
+          timestampsBuilder_.addAllMessages(values);
+        }
+        return this;
+      }
+      /**
+       * 
+       * Represent the multiple remove request contents based on timestamp.
+       * 

+       *
+       * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+       */
+      public Builder clearTimestamps() {
+        if (timestampsBuilder_ == null) {
+          timestamps_ = java.util.Collections.emptyList();
+          bitField0_ = (bitField0_ & ~0x00000001);
+          onChanged();
+        } else {
+          timestampsBuilder_.clear();
+        }
+        return this;
+      }
+      /**
+       * 
+       * Represent the multiple remove request contents based on timestamp.
+       * 

+       *
+       * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+       */
+      public Builder removeTimestamps(int index) {
+        if (timestampsBuilder_ == null) {
+          ensureTimestampsIsMutable();
+          timestamps_.remove(index);
+          onChanged();
+        } else {
+          timestampsBuilder_.remove(index);
+        }
+        return this;
+      }
+      /**
+       * 
+       * Represent the multiple remove request contents based on timestamp.
+       * 

+       *
+       * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+       */
+      public org.vdaas.vald.api.v1.payload.Remove.Timestamp.Builder getTimestampsBuilder(
+          int index) {
+        return getTimestampsFieldBuilder().getBuilder(index);
+      }
+      /**
+       * 
+       * Represent the multiple remove request contents based on timestamp.
+       * 

+       *
+       * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+       */
+      public org.vdaas.vald.api.v1.payload.Remove.TimestampOrBuilder getTimestampsOrBuilder(
+          int index) {
+        if (timestampsBuilder_ == null) {
+          return timestamps_.get(index);  } else {
+          return timestampsBuilder_.getMessageOrBuilder(index);
+        }
+      }
+      /**
+       * 
+       * Represent the multiple remove request contents based on timestamp.
+       * 

+       *
+       * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+       */
+      public java.util.List 
+           getTimestampsOrBuilderList() {
+        if (timestampsBuilder_ != null) {
+          return timestampsBuilder_.getMessageOrBuilderList();
+        } else {
+          return java.util.Collections.unmodifiableList(timestamps_);
+        }
+      }
+      /**
+       * 
+       * Represent the multiple remove request contents based on timestamp.
+       * 

+       *
+       * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+       */
+      public org.vdaas.vald.api.v1.payload.Remove.Timestamp.Builder addTimestampsBuilder() {
+        return getTimestampsFieldBuilder().addBuilder(
+            org.vdaas.vald.api.v1.payload.Remove.Timestamp.getDefaultInstance());
+      }
+      /**
+       * 
+       * Represent the multiple remove request contents based on timestamp.
+       * 

+       *
+       * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+       */
+      public org.vdaas.vald.api.v1.payload.Remove.Timestamp.Builder addTimestampsBuilder(
+          int index) {
+        return getTimestampsFieldBuilder().addBuilder(
+            index, org.vdaas.vald.api.v1.payload.Remove.Timestamp.getDefaultInstance());
+      }
+      /**
+       * 
+       * Represent the multiple remove request contents based on timestamp.
+       * 

+       *
+       * repeated .payload.v1.Remove.Timestamp timestamps = 1;
+       */
+      public java.util.List 
+           getTimestampsBuilderList() {
+        return getTimestampsFieldBuilder().getBuilderList();
+      }
+      private com.google.protobuf.RepeatedFieldBuilderV3<
+          org.vdaas.vald.api.v1.payload.Remove.Timestamp, org.vdaas.vald.api.v1.payload.Remove.Timestamp.Builder, org.vdaas.vald.api.v1.payload.Remove.TimestampOrBuilder> 
+          getTimestampsFieldBuilder() {
+        if (timestampsBuilder_ == null) {
+          timestampsBuilder_ = new com.google.protobuf.RepeatedFieldBuilderV3<
+              org.vdaas.vald.api.v1.payload.Remove.Timestamp, org.vdaas.vald.api.v1.payload.Remove.Timestamp.Builder, org.vdaas.vald.api.v1.payload.Remove.TimestampOrBuilder>(
+                  timestamps_,
+                  ((bitField0_ & 0x00000001) != 0),
+                  getParentForChildren(),
+                  isClean());
+          timestamps_ = null;
+        }
+        return timestampsBuilder_;
+      }
+      @java.lang.Override
+      public final Builder setUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.setUnknownFields(unknownFields);
+      }
+
+      @java.lang.Override
+      public final Builder mergeUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.mergeUnknownFields(unknownFields);
+      }
+
+
+      // @@protoc_insertion_point(builder_scope:payload.v1.Remove.TimestampRequest)
+    }
+
+    // @@protoc_insertion_point(class_scope:payload.v1.Remove.TimestampRequest)
+    private static final org.vdaas.vald.api.v1.payload.Remove.TimestampRequest DEFAULT_INSTANCE;
+    static {
+      DEFAULT_INSTANCE = new org.vdaas.vald.api.v1.payload.Remove.TimestampRequest();
+    }
+
+    public static org.vdaas.vald.api.v1.payload.Remove.TimestampRequest getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser
+        PARSER = new com.google.protobuf.AbstractParser() {
+      @java.lang.Override
+      public TimestampRequest parsePartialFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        Builder builder = newBuilder();
+        try {
+          builder.mergeFrom(input, extensionRegistry);
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          throw e.setUnfinishedMessage(builder.buildPartial());
+        } catch (com.google.protobuf.UninitializedMessageException e) {
+          throw e.asInvalidProtocolBufferException().setUnfinishedMessage(builder.buildPartial());
+        } catch (java.io.IOException e) {
+          throw new com.google.protobuf.InvalidProtocolBufferException(e)
+              .setUnfinishedMessage(builder.buildPartial());
+        }
+        return builder.buildPartial();
+      }
+    };
+
+    public static com.google.protobuf.Parser parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.payload.Remove.TimestampRequest getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+
+  }
+
+  public interface TimestampOrBuilder extends
+      // @@protoc_insertion_point(interface_extends:payload.v1.Remove.Timestamp)
+      com.google.protobuf.MessageOrBuilder {
+
+    /**
+     * 
+     * The timestamp.
+     * 

+     *
+     * int64 timestamp = 1;
+     * @return The timestamp.
+     */
+    long getTimestamp();
+
+    /**
+     * 
+     * The conditional operator.
+     * 

+     *
+     * .payload.v1.Remove.Timestamp.Operator operator = 2;
+     * @return The enum numeric value on the wire for operator.
+     */
+    int getOperatorValue();
+    /**
+     * 
+     * The conditional operator.
+     * 

+     *
+     * .payload.v1.Remove.Timestamp.Operator operator = 2;
+     * @return The operator.
+     */
+    org.vdaas.vald.api.v1.payload.Remove.Timestamp.Operator getOperator();
+  }
+  /**
+   * Protobuf type {@code payload.v1.Remove.Timestamp}
+   */
+  public static final class Timestamp extends
+      com.google.protobuf.GeneratedMessageV3 implements
+      // @@protoc_insertion_point(message_implements:payload.v1.Remove.Timestamp)
+      TimestampOrBuilder {
+  private static final long serialVersionUID = 0L;
+    // Use Timestamp.newBuilder() to construct.
+    private Timestamp(com.google.protobuf.GeneratedMessageV3.Builder builder) {
+      super(builder);
+    }
+    private Timestamp() {
+      operator_ = 0;
+    }
+
+    @java.lang.Override
+    @SuppressWarnings({"unused"})
+    protected java.lang.Object newInstance(
+        UnusedPrivateParameter unused) {
+      return new Timestamp();
+    }
+
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return org.vdaas.vald.api.v1.payload.ValdPayload.internal_static_payload_v1_Remove_Timestamp_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return org.vdaas.vald.api.v1.payload.ValdPayload.internal_static_payload_v1_Remove_Timestamp_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              org.vdaas.vald.api.v1.payload.Remove.Timestamp.class, org.vdaas.vald.api.v1.payload.Remove.Timestamp.Builder.class);
+    }
+
+    /**
+     * 
+     * Operator is enum of each conditional operator.
+     * 

+     *
+     * Protobuf enum {@code payload.v1.Remove.Timestamp.Operator}
+     */
+    public enum Operator
+        implements com.google.protobuf.ProtocolMessageEnum {
+      /**
+       * Eq = 0;
+       */
+      Eq(0),
+      /**
+       * Ne = 1;
+       */
+      Ne(1),
+      /**
+       * Ge = 2;
+       */
+      Ge(2),
+      /**
+       * Gt = 3;
+       */
+      Gt(3),
+      /**
+       * Le = 4;
+       */
+      Le(4),
+      /**
+       * Lt = 5;
+       */
+      Lt(5),
+      UNRECOGNIZED(-1),
+      ;
+
+      /**
+       * Eq = 0;
+       */
+      public static final int Eq_VALUE = 0;
+      /**
+       * Ne = 1;
+       */
+      public static final int Ne_VALUE = 1;
+      /**
+       * Ge = 2;
+       */
+      public static final int Ge_VALUE = 2;
+      /**
+       * Gt = 3;
+       */
+      public static final int Gt_VALUE = 3;
+      /**
+       * Le = 4;
+       */
+      public static final int Le_VALUE = 4;
+      /**
+       * Lt = 5;
+       */
+      public static final int Lt_VALUE = 5;
+
+
+      public final int getNumber() {
+        if (this == UNRECOGNIZED) {
+          throw new java.lang.IllegalArgumentException(
+              "Can't get the number of an unknown enum value.");
+        }
+        return value;
+      }
+
+      /**
+       * @param value The numeric wire value of the corresponding enum entry.
+       * @return The enum associated with the given numeric wire value.
+       * @deprecated Use {@link #forNumber(int)} instead.
+       */
+      @java.lang.Deprecated
+      public static Operator valueOf(int value) {
+        return forNumber(value);
+      }
+
+      /**
+       * @param value The numeric wire value of the corresponding enum entry.
+       * @return The enum associated with the given numeric wire value.
+       */
+      public static Operator forNumber(int value) {
+        switch (value) {
+          case 0: return Eq;
+          case 1: return Ne;
+          case 2: return Ge;
+          case 3: return Gt;
+          case 4: return Le;
+          case 5: return Lt;
+          default: return null;
+        }
+      }
+
+      public static com.google.protobuf.Internal.EnumLiteMap
+          internalGetValueMap() {
+        return internalValueMap;
+      }
+      private static final com.google.protobuf.Internal.EnumLiteMap<
+          Operator> internalValueMap =
+            new com.google.protobuf.Internal.EnumLiteMap() {
+              public Operator findValueByNumber(int number) {
+                return Operator.forNumber(number);
+              }
+            };
+
+      public final com.google.protobuf.Descriptors.EnumValueDescriptor
+          getValueDescriptor() {
+        if (this == UNRECOGNIZED) {
+          throw new java.lang.IllegalStateException(
+              "Can't get the descriptor of an unrecognized enum value.");
+        }
+        return getDescriptor().getValues().get(ordinal());
+      }
+      public final com.google.protobuf.Descriptors.EnumDescriptor
+          getDescriptorForType() {
+        return getDescriptor();
+      }
+      public static final com.google.protobuf.Descriptors.EnumDescriptor
+          getDescriptor() {
+        return org.vdaas.vald.api.v1.payload.Remove.Timestamp.getDescriptor().getEnumTypes().get(0);
+      }
+
+      private static final Operator[] VALUES = values();
+
+      public static Operator valueOf(
+          com.google.protobuf.Descriptors.EnumValueDescriptor desc) {
+        if (desc.getType() != getDescriptor()) {
+          throw new java.lang.IllegalArgumentException(
+            "EnumValueDescriptor is not for this type.");
+        }
+        if (desc.getIndex() == -1) {
+          return UNRECOGNIZED;
+        }
+        return VALUES[desc.getIndex()];
+      }
+
+      private final int value;
+
+      private Operator(int value) {
+        this.value = value;
+      }
+
+      // @@protoc_insertion_point(enum_scope:payload.v1.Remove.Timestamp.Operator)
+    }
+
+    public static final int TIMESTAMP_FIELD_NUMBER = 1;
+    private long timestamp_ = 0L;
+    /**
+     * 
+     * The timestamp.
+     * 

+     *
+     * int64 timestamp = 1;
+     * @return The timestamp.
+     */
+    @java.lang.Override
+    public long getTimestamp() {
+      return timestamp_;
+    }
+
+    public static final int OPERATOR_FIELD_NUMBER = 2;
+    private int operator_ = 0;
+    /**
+     * 
+     * The conditional operator.
+     * 

+     *
+     * .payload.v1.Remove.Timestamp.Operator operator = 2;
+     * @return The enum numeric value on the wire for operator.
+     */
+    @java.lang.Override public int getOperatorValue() {
+      return operator_;
+    }
+    /**
+     * 
+     * The conditional operator.
+     * 

+     *
+     * .payload.v1.Remove.Timestamp.Operator operator = 2;
+     * @return The operator.
+     */
+    @java.lang.Override public org.vdaas.vald.api.v1.payload.Remove.Timestamp.Operator getOperator() {
+      org.vdaas.vald.api.v1.payload.Remove.Timestamp.Operator result = org.vdaas.vald.api.v1.payload.Remove.Timestamp.Operator.forNumber(operator_);
+      return result == null ? org.vdaas.vald.api.v1.payload.Remove.Timestamp.Operator.UNRECOGNIZED : result;
+    }
+
+    private byte memoizedIsInitialized = -1;
+    @java.lang.Override
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized == 1) return true;
+      if (isInitialized == 0) return false;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    @java.lang.Override
+    public void writeTo(com.google.protobuf.CodedOutputStream output)
+                        throws java.io.IOException {
+      if (timestamp_ != 0L) {
+        output.writeInt64(1, timestamp_);
+      }
+      if (operator_ != org.vdaas.vald.api.v1.payload.Remove.Timestamp.Operator.Eq.getNumber()) {
+        output.writeEnum(2, operator_);
+      }
+      getUnknownFields().writeTo(output);
+    }
+
+    @java.lang.Override
+    public int getSerializedSize() {
+      int size = memoizedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      if (timestamp_ != 0L) {
+        size += com.google.protobuf.CodedOutputStream
+          .computeInt64Size(1, timestamp_);
+      }
+      if (operator_ != org.vdaas.vald.api.v1.payload.Remove.Timestamp.Operator.Eq.getNumber()) {
+        size += com.google.protobuf.CodedOutputStream
+          .computeEnumSize(2, operator_);
+      }
+      size += getUnknownFields().getSerializedSize();
+      memoizedSize = size;
+      return size;
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+       return true;
+      }
+      if (!(obj instanceof org.vdaas.vald.api.v1.payload.Remove.Timestamp)) {
+        return super.equals(obj);
+      }
+      org.vdaas.vald.api.v1.payload.Remove.Timestamp other = (org.vdaas.vald.api.v1.payload.Remove.Timestamp) obj;
+
+      if (getTimestamp()
+          != other.getTimestamp()) return false;
+      if (operator_ != other.operator_) return false;
+      if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+      return true;
+    }
+
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      hash = (37 * hash) + TIMESTAMP_FIELD_NUMBER;
+      hash = (53 * hash) + com.google.protobuf.Internal.hashLong(
+          getTimestamp());
+      hash = (37 * hash) + OPERATOR_FIELD_NUMBER;
+      hash = (53 * hash) + operator_;
+      hash = (29 * hash) + getUnknownFields().hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static org.vdaas.vald.api.v1.payload.Remove.Timestamp parseFrom(
+        java.nio.ByteBuffer data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.vdaas.vald.api.v1.payload.Remove.Timestamp parseFrom(
+        java.nio.ByteBuffer data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.payload.Remove.Timestamp parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.vdaas.vald.api.v1.payload.Remove.Timestamp parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.payload.Remove.Timestamp parseFrom(byte[] data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.vdaas.vald.api.v1.payload.Remove.Timestamp parseFrom(
+        byte[] data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.payload.Remove.Timestamp parseFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input);
+    }
+    public static org.vdaas.vald.api.v1.payload.Remove.Timestamp parseFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input, extensionRegistry);
+    }
+
+    public static org.vdaas.vald.api.v1.payload.Remove.Timestamp parseDelimitedFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseDelimitedWithIOException(PARSER, input);
+    }
+
+    public static org.vdaas.vald.api.v1.payload.Remove.Timestamp parseDelimitedFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.payload.Remove.Timestamp parseFrom(
+        com.google.protobuf.CodedInputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input);
+    }
+    public static org.vdaas.vald.api.v1.payload.Remove.Timestamp parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() { return newBuilder(); }
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+    public static Builder newBuilder(org.vdaas.vald.api.v1.payload.Remove.Timestamp prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE
+          ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+    /**
+     * Protobuf type {@code payload.v1.Remove.Timestamp}
+     */
+    public static final class Builder extends
+        com.google.protobuf.GeneratedMessageV3.Builder implements
+        // @@protoc_insertion_point(builder_implements:payload.v1.Remove.Timestamp)
+        org.vdaas.vald.api.v1.payload.Remove.TimestampOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor
+          getDescriptor() {
+        return org.vdaas.vald.api.v1.payload.ValdPayload.internal_static_payload_v1_Remove_Timestamp_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return org.vdaas.vald.api.v1.payload.ValdPayload.internal_static_payload_v1_Remove_Timestamp_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                org.vdaas.vald.api.v1.payload.Remove.Timestamp.class, org.vdaas.vald.api.v1.payload.Remove.Timestamp.Builder.class);
+      }
+
+      // Construct using org.vdaas.vald.api.v1.payload.Remove.Timestamp.newBuilder()
+      private Builder() {
+
+      }
+
+      private Builder(
+          com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+        super(parent);
+
+      }
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        bitField0_ = 0;
+        timestamp_ = 0L;
+        operator_ = 0;
+        return this;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor
+          getDescriptorForType() {
+        return org.vdaas.vald.api.v1.payload.ValdPayload.internal_static_payload_v1_Remove_Timestamp_descriptor;
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.payload.Remove.Timestamp getDefaultInstanceForType() {
+        return org.vdaas.vald.api.v1.payload.Remove.Timestamp.getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.payload.Remove.Timestamp build() {
+        org.vdaas.vald.api.v1.payload.Remove.Timestamp result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.payload.Remove.Timestamp buildPartial() {
+        org.vdaas.vald.api.v1.payload.Remove.Timestamp result = new org.vdaas.vald.api.v1.payload.Remove.Timestamp(this);
+        if (bitField0_ != 0) { buildPartial0(result); }
+        onBuilt();
+        return result;
+      }
+
+      private void buildPartial0(org.vdaas.vald.api.v1.payload.Remove.Timestamp result) {
+        int from_bitField0_ = bitField0_;
+        if (((from_bitField0_ & 0x00000001) != 0)) {
+          result.timestamp_ = timestamp_;
+        }
+        if (((from_bitField0_ & 0x00000002) != 0)) {
+          result.operator_ = operator_;
+        }
+      }
+
+      @java.lang.Override
+      public Builder clone() {
+        return super.clone();
+      }
+      @java.lang.Override
+      public Builder setField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          java.lang.Object value) {
+        return super.setField(field, value);
+      }
+      @java.lang.Override
+      public Builder clearField(
+          com.google.protobuf.Descriptors.FieldDescriptor field) {
+        return super.clearField(field);
+      }
+      @java.lang.Override
+      public Builder clearOneof(
+          com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+        return super.clearOneof(oneof);
+      }
+      @java.lang.Override
+      public Builder setRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          int index, java.lang.Object value) {
+        return super.setRepeatedField(field, index, value);
+      }
+      @java.lang.Override
+      public Builder addRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          java.lang.Object value) {
+        return super.addRepeatedField(field, value);
+      }
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof org.vdaas.vald.api.v1.payload.Remove.Timestamp) {
+          return mergeFrom((org.vdaas.vald.api.v1.payload.Remove.Timestamp)other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(org.vdaas.vald.api.v1.payload.Remove.Timestamp other) {
+        if (other == org.vdaas.vald.api.v1.payload.Remove.Timestamp.getDefaultInstance()) return this;
+        if (other.getTimestamp() != 0L) {
+          setTimestamp(other.getTimestamp());
+        }
+        if (other.operator_ != 0) {
+          setOperatorValue(other.getOperatorValue());
+        }
+        this.mergeUnknownFields(other.getUnknownFields());
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        if (extensionRegistry == null) {
+          throw new java.lang.NullPointerException();
+        }
+        try {
+          boolean done = false;
+          while (!done) {
+            int tag = input.readTag();
+            switch (tag) {
+              case 0:
+                done = true;
+                break;
+              case 8: {
+                timestamp_ = input.readInt64();
+                bitField0_ |= 0x00000001;
+                break;
+              } // case 8
+              case 16: {
+                operator_ = input.readEnum();
+                bitField0_ |= 0x00000002;
+                break;
+              } // case 16
+              default: {
+                if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                  done = true; // was an endgroup tag
+                }
+                break;
+              } // default:
+            } // switch (tag)
+          } // while (!done)
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          throw e.unwrapIOException();
+        } finally {
+          onChanged();
+        } // finally
+        return this;
+      }
+      private int bitField0_;
+
+      private long timestamp_ ;
+      /**
+       * 
+       * The timestamp.
+       * 

+       *
+       * int64 timestamp = 1;
+       * @return The timestamp.
+       */
+      @java.lang.Override
+      public long getTimestamp() {
+        return timestamp_;
+      }
+      /**
+       * 
+       * The timestamp.
+       * 

+       *
+       * int64 timestamp = 1;
+       * @param value The timestamp to set.
+       * @return This builder for chaining.
+       */
+      public Builder setTimestamp(long value) {
+
+        timestamp_ = value;
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+      /**
+       * 
+       * The timestamp.
+       * 

+       *
+       * int64 timestamp = 1;
+       * @return This builder for chaining.
+       */
+      public Builder clearTimestamp() {
+        bitField0_ = (bitField0_ & ~0x00000001);
+        timestamp_ = 0L;
+        onChanged();
+        return this;
+      }
+
+      private int operator_ = 0;
+      /**
+       * 
+       * The conditional operator.
+       * 

+       *
+       * .payload.v1.Remove.Timestamp.Operator operator = 2;
+       * @return The enum numeric value on the wire for operator.
+       */
+      @java.lang.Override public int getOperatorValue() {
+        return operator_;
+      }
+      /**
+       * 
+       * The conditional operator.
+       * 

+       *
+       * .payload.v1.Remove.Timestamp.Operator operator = 2;
+       * @param value The enum numeric value on the wire for operator to set.
+       * @return This builder for chaining.
+       */
+      public Builder setOperatorValue(int value) {
+        operator_ = value;
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return this;
+      }
+      /**
+       * 
+       * The conditional operator.
+       * 

+       *
+       * .payload.v1.Remove.Timestamp.Operator operator = 2;
+       * @return The operator.
+       */
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.payload.Remove.Timestamp.Operator getOperator() {
+        org.vdaas.vald.api.v1.payload.Remove.Timestamp.Operator result = org.vdaas.vald.api.v1.payload.Remove.Timestamp.Operator.forNumber(operator_);
+        return result == null ? org.vdaas.vald.api.v1.payload.Remove.Timestamp.Operator.UNRECOGNIZED : result;
+      }
+      /**
+       * 
+       * The conditional operator.
+       * 

+       *
+       * .payload.v1.Remove.Timestamp.Operator operator = 2;
+       * @param value The operator to set.
+       * @return This builder for chaining.
+       */
+      public Builder setOperator(org.vdaas.vald.api.v1.payload.Remove.Timestamp.Operator value) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        bitField0_ |= 0x00000002;
+        operator_ = value.getNumber();
+        onChanged();
+        return this;
+      }
+      /**
+       * 
+       * The conditional operator.
+       * 

+       *
+       * .payload.v1.Remove.Timestamp.Operator operator = 2;
+       * @return This builder for chaining.
+       */
+      public Builder clearOperator() {
+        bitField0_ = (bitField0_ & ~0x00000002);
+        operator_ = 0;
+        onChanged();
+        return this;
+      }
+      @java.lang.Override
+      public final Builder setUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.setUnknownFields(unknownFields);
+      }
+
+      @java.lang.Override
+      public final Builder mergeUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.mergeUnknownFields(unknownFields);
+      }
+
+
+      // @@protoc_insertion_point(builder_scope:payload.v1.Remove.Timestamp)
+    }
+
+    // @@protoc_insertion_point(class_scope:payload.v1.Remove.Timestamp)
+    private static final org.vdaas.vald.api.v1.payload.Remove.Timestamp DEFAULT_INSTANCE;
+    static {
+      DEFAULT_INSTANCE = new org.vdaas.vald.api.v1.payload.Remove.Timestamp();
+    }
+
+    public static org.vdaas.vald.api.v1.payload.Remove.Timestamp getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser
+        PARSER = new com.google.protobuf.AbstractParser() {
+      @java.lang.Override
+      public Timestamp parsePartialFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        Builder builder = newBuilder();
+        try {
+          builder.mergeFrom(input, extensionRegistry);
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          throw e.setUnfinishedMessage(builder.buildPartial());
+        } catch (com.google.protobuf.UninitializedMessageException e) {
+          throw e.asInvalidProtocolBufferException().setUnfinishedMessage(builder.buildPartial());
+        } catch (java.io.IOException e) {
+          throw new com.google.protobuf.InvalidProtocolBufferException(e)
+              .setUnfinishedMessage(builder.buildPartial());
+        }
+        return builder.buildPartial();
+      }
+    };
+
+    public static com.google.protobuf.Parser parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.payload.Remove.Timestamp getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+
+  }
+
   public interface ConfigOrBuilder extends
       // @@protoc_insertion_point(interface_extends:payload.v1.Remove.Config)
       com.google.protobuf.MessageOrBuilder {
diff --git a/src/main/java/org/vdaas/vald/api/v1/payload/Search.java b/src/main/java/org/vdaas/vald/api/v1/payload/Search.java
index 313f659f..c0aaef3a 100644
--- a/src/main/java/org/vdaas/vald/api/v1/payload/Search.java
+++ b/src/main/java/org/vdaas/vald/api/v1/payload/Search.java
@@ -281,9 +281,11 @@ protected java.lang.Object newInstance(
               org.vdaas.vald.api.v1.payload.Search.Request.class, org.vdaas.vald.api.v1.payload.Search.Request.Builder.class);
     }
 
+    private int bitField0_;
     public static final int VECTOR_FIELD_NUMBER = 1;
     @SuppressWarnings("serial")
-    private com.google.protobuf.Internal.FloatList vector_;
+    private com.google.protobuf.Internal.FloatList vector_ =
+        emptyFloatList();
     /**
      * 
      * The vector to be searched.
@@ -334,7 +336,7 @@ public float getVector(int index) {
      */
     @java.lang.Override
     public boolean hasConfig() {
-      return config_ != null;
+      return ((bitField0_ & 0x00000001) != 0);
     }
     /**
      * 
@@ -382,7 +384,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output)
       for (int i = 0; i < vector_.size(); i++) {
         output.writeFloatNoTag(vector_.getFloat(i));
       }
-      if (config_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         output.writeMessage(2, getConfig());
       }
       getUnknownFields().writeTo(output);
@@ -405,7 +407,7 @@ public int getSerializedSize() {
         }
         vectorMemoizedSerializedSize = dataSize;
       }
-      if (config_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(2, getConfig());
       }
@@ -573,13 +575,19 @@ public static final class Builder extends
 
       // Construct using org.vdaas.vald.api.v1.payload.Search.Request.newBuilder()
       private Builder() {
-
+        maybeForceBuilderInitialization();
       }
 
       private Builder(
           com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
         super(parent);
-
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3
+                .alwaysUseFieldBuilders) {
+          getConfigFieldBuilder();
+        }
       }
       @java.lang.Override
       public Builder clear() {
@@ -617,27 +625,25 @@ public org.vdaas.vald.api.v1.payload.Search.Request build() {
       @java.lang.Override
       public org.vdaas.vald.api.v1.payload.Search.Request buildPartial() {
         org.vdaas.vald.api.v1.payload.Search.Request result = new org.vdaas.vald.api.v1.payload.Search.Request(this);
-        buildPartialRepeatedFields(result);
         if (bitField0_ != 0) { buildPartial0(result); }
         onBuilt();
         return result;
       }
 
-      private void buildPartialRepeatedFields(org.vdaas.vald.api.v1.payload.Search.Request result) {
-        if (((bitField0_ & 0x00000001) != 0)) {
-          vector_.makeImmutable();
-          bitField0_ = (bitField0_ & ~0x00000001);
-        }
-        result.vector_ = vector_;
-      }
-
       private void buildPartial0(org.vdaas.vald.api.v1.payload.Search.Request result) {
         int from_bitField0_ = bitField0_;
+        if (((from_bitField0_ & 0x00000001) != 0)) {
+          vector_.makeImmutable();
+          result.vector_ = vector_;
+        }
+        int to_bitField0_ = 0;
         if (((from_bitField0_ & 0x00000002) != 0)) {
           result.config_ = configBuilder_ == null
               ? config_
               : configBuilder_.build();
+          to_bitField0_ |= 0x00000001;
         }
+        result.bitField0_ |= to_bitField0_;
       }
 
       @java.lang.Override
@@ -687,7 +693,8 @@ public Builder mergeFrom(org.vdaas.vald.api.v1.payload.Search.Request other) {
         if (!other.vector_.isEmpty()) {
           if (vector_.isEmpty()) {
             vector_ = other.vector_;
-            bitField0_ = (bitField0_ & ~0x00000001);
+            vector_.makeImmutable();
+            bitField0_ |= 0x00000001;
           } else {
             ensureVectorIsMutable();
             vector_.addAll(other.vector_);
@@ -732,7 +739,8 @@ public Builder mergeFrom(
               case 10: {
                 int length = input.readRawVarint32();
                 int limit = input.pushLimit(length);
-                ensureVectorIsMutable();
+                int alloc = length > 4096 ? 4096 : length;
+                ensureVectorIsMutable(alloc / 4);
                 while (input.getBytesUntilLimit() > 0) {
                   vector_.addFloat(input.readFloat());
                 }
@@ -765,10 +773,16 @@ public Builder mergeFrom(
 
       private com.google.protobuf.Internal.FloatList vector_ = emptyFloatList();
       private void ensureVectorIsMutable() {
-        if (!((bitField0_ & 0x00000001) != 0)) {
-          vector_ = mutableCopy(vector_);
-          bitField0_ |= 0x00000001;
+        if (!vector_.isModifiable()) {
+          vector_ = makeMutableCopy(vector_);
+        }
+        bitField0_ |= 0x00000001;
+      }
+      private void ensureVectorIsMutable(int capacity) {
+        if (!vector_.isModifiable()) {
+          vector_ = makeMutableCopy(vector_, capacity);
         }
+        bitField0_ |= 0x00000001;
       }
       /**
        * 
@@ -780,8 +794,8 @@ private void ensureVectorIsMutable() {
        */
       public java.util.List
           getVectorList() {
-        return ((bitField0_ & 0x00000001) != 0) ?
-                 java.util.Collections.unmodifiableList(vector_) : vector_;
+        vector_.makeImmutable();
+        return vector_;
       }
       /**
        * 
@@ -821,6 +835,7 @@ public Builder setVector(
 
         ensureVectorIsMutable();
         vector_.setFloat(index, value);
+        bitField0_ |= 0x00000001;
         onChanged();
         return this;
       }
@@ -837,6 +852,7 @@ public Builder addVector(float value) {
 
         ensureVectorIsMutable();
         vector_.addFloat(value);
+        bitField0_ |= 0x00000001;
         onChanged();
         return this;
       }
@@ -854,6 +870,7 @@ public Builder addAllVector(
         ensureVectorIsMutable();
         com.google.protobuf.AbstractMessageLite.Builder.addAll(
             values, vector_);
+        bitField0_ |= 0x00000001;
         onChanged();
         return this;
       }
@@ -958,8 +975,10 @@ public Builder mergeConfig(org.vdaas.vald.api.v1.payload.Search.Config value) {
         } else {
           configBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000002;
-        onChanged();
+        if (config_ != null) {
+          bitField0_ |= 0x00000002;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -2083,6 +2102,7 @@ protected java.lang.Object newInstance(
               org.vdaas.vald.api.v1.payload.Search.IDRequest.class, org.vdaas.vald.api.v1.payload.Search.IDRequest.Builder.class);
     }
 
+    private int bitField0_;
     public static final int ID_FIELD_NUMBER = 1;
     @SuppressWarnings("serial")
     private volatile java.lang.Object id_ = "";
@@ -2142,7 +2162,7 @@ public java.lang.String getId() {
      */
     @java.lang.Override
     public boolean hasConfig() {
-      return config_ != null;
+      return ((bitField0_ & 0x00000001) != 0);
     }
     /**
      * 
@@ -2185,7 +2205,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output)
       if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(id_)) {
         com.google.protobuf.GeneratedMessageV3.writeString(output, 1, id_);
       }
-      if (config_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         output.writeMessage(2, getConfig());
       }
       getUnknownFields().writeTo(output);
@@ -2200,7 +2220,7 @@ public int getSerializedSize() {
       if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(id_)) {
         size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, id_);
       }
-      if (config_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(2, getConfig());
       }
@@ -2366,13 +2386,19 @@ public static final class Builder extends
 
       // Construct using org.vdaas.vald.api.v1.payload.Search.IDRequest.newBuilder()
       private Builder() {
-
+        maybeForceBuilderInitialization();
       }
 
       private Builder(
           com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
         super(parent);
-
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3
+                .alwaysUseFieldBuilders) {
+          getConfigFieldBuilder();
+        }
       }
       @java.lang.Override
       public Builder clear() {
@@ -2420,11 +2446,14 @@ private void buildPartial0(org.vdaas.vald.api.v1.payload.Search.IDRequest result
         if (((from_bitField0_ & 0x00000001) != 0)) {
           result.id_ = id_;
         }
+        int to_bitField0_ = 0;
         if (((from_bitField0_ & 0x00000002) != 0)) {
           result.config_ = configBuilder_ == null
               ? config_
               : configBuilder_.build();
+          to_bitField0_ |= 0x00000001;
         }
+        result.bitField0_ |= to_bitField0_;
       }
 
       @java.lang.Override
@@ -2712,8 +2741,10 @@ public Builder mergeConfig(org.vdaas.vald.api.v1.payload.Search.Config value) {
         } else {
           configBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000002;
-        onChanged();
+        if (config_ != null) {
+          bitField0_ |= 0x00000002;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -3854,6 +3885,7 @@ protected java.lang.Object newInstance(
               org.vdaas.vald.api.v1.payload.Search.ObjectRequest.class, org.vdaas.vald.api.v1.payload.Search.ObjectRequest.Builder.class);
     }
 
+    private int bitField0_;
     public static final int OBJECT_FIELD_NUMBER = 1;
     private com.google.protobuf.ByteString object_ = com.google.protobuf.ByteString.EMPTY;
     /**
@@ -3881,7 +3913,7 @@ public com.google.protobuf.ByteString getObject() {
      */
     @java.lang.Override
     public boolean hasConfig() {
-      return config_ != null;
+      return ((bitField0_ & 0x00000001) != 0);
     }
     /**
      * 
@@ -3919,7 +3951,7 @@ public org.vdaas.vald.api.v1.payload.Search.ConfigOrBuilder getConfigOrBuilder()
      */
     @java.lang.Override
     public boolean hasVectorizer() {
-      return vectorizer_ != null;
+      return ((bitField0_ & 0x00000002) != 0);
     }
     /**
      * 
@@ -3962,10 +3994,10 @@ public void writeTo(com.google.protobuf.CodedOutputStream output)
       if (!object_.isEmpty()) {
         output.writeBytes(1, object_);
       }
-      if (config_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         output.writeMessage(2, getConfig());
       }
-      if (vectorizer_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         output.writeMessage(3, getVectorizer());
       }
       getUnknownFields().writeTo(output);
@@ -3981,11 +4013,11 @@ public int getSerializedSize() {
         size += com.google.protobuf.CodedOutputStream
           .computeBytesSize(1, object_);
       }
-      if (config_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(2, getConfig());
       }
-      if (vectorizer_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(3, getVectorizer());
       }
@@ -4160,13 +4192,20 @@ public static final class Builder extends
 
       // Construct using org.vdaas.vald.api.v1.payload.Search.ObjectRequest.newBuilder()
       private Builder() {
-
+        maybeForceBuilderInitialization();
       }
 
       private Builder(
           com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
         super(parent);
-
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3
+                .alwaysUseFieldBuilders) {
+          getConfigFieldBuilder();
+          getVectorizerFieldBuilder();
+        }
       }
       @java.lang.Override
       public Builder clear() {
@@ -4219,16 +4258,20 @@ private void buildPartial0(org.vdaas.vald.api.v1.payload.Search.ObjectRequest re
         if (((from_bitField0_ & 0x00000001) != 0)) {
           result.object_ = object_;
         }
+        int to_bitField0_ = 0;
         if (((from_bitField0_ & 0x00000002) != 0)) {
           result.config_ = configBuilder_ == null
               ? config_
               : configBuilder_.build();
+          to_bitField0_ |= 0x00000001;
         }
         if (((from_bitField0_ & 0x00000004) != 0)) {
           result.vectorizer_ = vectorizerBuilder_ == null
               ? vectorizer_
               : vectorizerBuilder_.build();
+          to_bitField0_ |= 0x00000002;
         }
+        result.bitField0_ |= to_bitField0_;
       }
 
       @java.lang.Override
@@ -4476,8 +4519,10 @@ public Builder mergeConfig(org.vdaas.vald.api.v1.payload.Search.Config value) {
         } else {
           configBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000002;
-        onChanged();
+        if (config_ != null) {
+          bitField0_ |= 0x00000002;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -4631,8 +4676,10 @@ public Builder mergeVectorizer(org.vdaas.vald.api.v1.payload.Filter.Target value
         } else {
           vectorizerBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000004;
-        onChanged();
+        if (vectorizer_ != null) {
+          bitField0_ |= 0x00000004;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -5853,6 +5900,7 @@ protected java.lang.Object newInstance(
               org.vdaas.vald.api.v1.payload.Search.Config.class, org.vdaas.vald.api.v1.payload.Search.Config.Builder.class);
     }
 
+    private int bitField0_;
     public static final int REQUEST_ID_FIELD_NUMBER = 1;
     @SuppressWarnings("serial")
     private volatile java.lang.Object requestId_ = "";
@@ -5972,7 +6020,7 @@ public long getTimeout() {
      */
     @java.lang.Override
     public boolean hasIngressFilters() {
-      return ingressFilters_ != null;
+      return ((bitField0_ & 0x00000001) != 0);
     }
     /**
      * 
@@ -6010,7 +6058,7 @@ public org.vdaas.vald.api.v1.payload.Filter.ConfigOrBuilder getIngressFiltersOrB
      */
     @java.lang.Override
     public boolean hasEgressFilters() {
-      return egressFilters_ != null;
+      return ((bitField0_ & 0x00000002) != 0);
     }
     /**
      * 
@@ -6106,10 +6154,10 @@ public void writeTo(com.google.protobuf.CodedOutputStream output)
       if (timeout_ != 0L) {
         output.writeInt64(5, timeout_);
       }
-      if (ingressFilters_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         output.writeMessage(6, getIngressFilters());
       }
-      if (egressFilters_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         output.writeMessage(7, getEgressFilters());
       }
       if (minNum_ != 0) {
@@ -6146,11 +6194,11 @@ public int getSerializedSize() {
         size += com.google.protobuf.CodedOutputStream
           .computeInt64Size(5, timeout_);
       }
-      if (ingressFilters_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(6, getIngressFilters());
       }
-      if (egressFilters_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(7, getEgressFilters());
       }
@@ -6361,13 +6409,20 @@ public static final class Builder extends
 
       // Construct using org.vdaas.vald.api.v1.payload.Search.Config.newBuilder()
       private Builder() {
-
+        maybeForceBuilderInitialization();
       }
 
       private Builder(
           com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
         super(parent);
-
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3
+                .alwaysUseFieldBuilders) {
+          getIngressFiltersFieldBuilder();
+          getEgressFiltersFieldBuilder();
+        }
       }
       @java.lang.Override
       public Builder clear() {
@@ -6438,15 +6493,18 @@ private void buildPartial0(org.vdaas.vald.api.v1.payload.Search.Config result) {
         if (((from_bitField0_ & 0x00000010) != 0)) {
           result.timeout_ = timeout_;
         }
+        int to_bitField0_ = 0;
         if (((from_bitField0_ & 0x00000020) != 0)) {
           result.ingressFilters_ = ingressFiltersBuilder_ == null
               ? ingressFilters_
               : ingressFiltersBuilder_.build();
+          to_bitField0_ |= 0x00000001;
         }
         if (((from_bitField0_ & 0x00000040) != 0)) {
           result.egressFilters_ = egressFiltersBuilder_ == null
               ? egressFilters_
               : egressFiltersBuilder_.build();
+          to_bitField0_ |= 0x00000002;
         }
         if (((from_bitField0_ & 0x00000080) != 0)) {
           result.minNum_ = minNum_;
@@ -6454,6 +6512,7 @@ private void buildPartial0(org.vdaas.vald.api.v1.payload.Search.Config result) {
         if (((from_bitField0_ & 0x00000100) != 0)) {
           result.aggregationAlgorithm_ = aggregationAlgorithm_;
         }
+        result.bitField0_ |= to_bitField0_;
       }
 
       @java.lang.Override
@@ -6975,8 +7034,10 @@ public Builder mergeIngressFilters(org.vdaas.vald.api.v1.payload.Filter.Config v
         } else {
           ingressFiltersBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000020;
-        onChanged();
+        if (ingressFilters_ != null) {
+          bitField0_ |= 0x00000020;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -7130,8 +7191,10 @@ public Builder mergeEgressFilters(org.vdaas.vald.api.v1.payload.Filter.Config va
         } else {
           egressFiltersBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000040;
-        onChanged();
+        if (egressFilters_ != null) {
+          bitField0_ |= 0x00000040;
+          onChanged();
+        }
         return this;
       }
       /**
diff --git a/src/main/java/org/vdaas/vald/api/v1/payload/Update.java b/src/main/java/org/vdaas/vald/api/v1/payload/Update.java
index 59099ebc..89aaa5e4 100644
--- a/src/main/java/org/vdaas/vald/api/v1/payload/Update.java
+++ b/src/main/java/org/vdaas/vald/api/v1/payload/Update.java
@@ -139,6 +139,7 @@ protected java.lang.Object newInstance(
               org.vdaas.vald.api.v1.payload.Update.Request.class, org.vdaas.vald.api.v1.payload.Update.Request.Builder.class);
     }
 
+    private int bitField0_;
     public static final int VECTOR_FIELD_NUMBER = 1;
     private org.vdaas.vald.api.v1.payload.Object.Vector vector_;
     /**
@@ -151,7 +152,7 @@ protected java.lang.Object newInstance(
      */
     @java.lang.Override
     public boolean hasVector() {
-      return vector_ != null;
+      return ((bitField0_ & 0x00000001) != 0);
     }
     /**
      * 
@@ -189,7 +190,7 @@ public org.vdaas.vald.api.v1.payload.Object.VectorOrBuilder getVectorOrBuilder()
      */
     @java.lang.Override
     public boolean hasConfig() {
-      return config_ != null;
+      return ((bitField0_ & 0x00000002) != 0);
     }
     /**
      * 
@@ -229,10 +230,10 @@ public final boolean isInitialized() {
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output)
                         throws java.io.IOException {
-      if (vector_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         output.writeMessage(1, getVector());
       }
-      if (config_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         output.writeMessage(2, getConfig());
       }
       getUnknownFields().writeTo(output);
@@ -244,11 +245,11 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (vector_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(1, getVector());
       }
-      if (config_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(2, getConfig());
       }
@@ -419,13 +420,20 @@ public static final class Builder extends
 
       // Construct using org.vdaas.vald.api.v1.payload.Update.Request.newBuilder()
       private Builder() {
-
+        maybeForceBuilderInitialization();
       }
 
       private Builder(
           com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
         super(parent);
-
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3
+                .alwaysUseFieldBuilders) {
+          getVectorFieldBuilder();
+          getConfigFieldBuilder();
+        }
       }
       @java.lang.Override
       public Builder clear() {
@@ -474,16 +482,20 @@ public org.vdaas.vald.api.v1.payload.Update.Request buildPartial() {
 
       private void buildPartial0(org.vdaas.vald.api.v1.payload.Update.Request result) {
         int from_bitField0_ = bitField0_;
+        int to_bitField0_ = 0;
         if (((from_bitField0_ & 0x00000001) != 0)) {
           result.vector_ = vectorBuilder_ == null
               ? vector_
               : vectorBuilder_.build();
+          to_bitField0_ |= 0x00000001;
         }
         if (((from_bitField0_ & 0x00000002) != 0)) {
           result.config_ = configBuilder_ == null
               ? config_
               : configBuilder_.build();
+          to_bitField0_ |= 0x00000002;
         }
+        result.bitField0_ |= to_bitField0_;
       }
 
       @java.lang.Override
@@ -679,8 +691,10 @@ public Builder mergeVector(org.vdaas.vald.api.v1.payload.Object.Vector value) {
         } else {
           vectorBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000001;
-        onChanged();
+        if (vector_ != null) {
+          bitField0_ |= 0x00000001;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -834,8 +848,10 @@ public Builder mergeConfig(org.vdaas.vald.api.v1.payload.Update.Config value) {
         } else {
           configBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000002;
-        onChanged();
+        if (config_ != null) {
+          bitField0_ |= 0x00000002;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -1992,6 +2008,7 @@ protected java.lang.Object newInstance(
               org.vdaas.vald.api.v1.payload.Update.ObjectRequest.class, org.vdaas.vald.api.v1.payload.Update.ObjectRequest.Builder.class);
     }
 
+    private int bitField0_;
     public static final int OBJECT_FIELD_NUMBER = 1;
     private org.vdaas.vald.api.v1.payload.Object.Blob object_;
     /**
@@ -2004,7 +2021,7 @@ protected java.lang.Object newInstance(
      */
     @java.lang.Override
     public boolean hasObject() {
-      return object_ != null;
+      return ((bitField0_ & 0x00000001) != 0);
     }
     /**
      * 
@@ -2042,7 +2059,7 @@ public org.vdaas.vald.api.v1.payload.Object.BlobOrBuilder getObjectOrBuilder() {
      */
     @java.lang.Override
     public boolean hasConfig() {
-      return config_ != null;
+      return ((bitField0_ & 0x00000002) != 0);
     }
     /**
      * 
@@ -2080,7 +2097,7 @@ public org.vdaas.vald.api.v1.payload.Update.ConfigOrBuilder getConfigOrBuilder()
      */
     @java.lang.Override
     public boolean hasVectorizer() {
-      return vectorizer_ != null;
+      return ((bitField0_ & 0x00000004) != 0);
     }
     /**
      * 
@@ -2120,13 +2137,13 @@ public final boolean isInitialized() {
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output)
                         throws java.io.IOException {
-      if (object_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         output.writeMessage(1, getObject());
       }
-      if (config_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         output.writeMessage(2, getConfig());
       }
-      if (vectorizer_ != null) {
+      if (((bitField0_ & 0x00000004) != 0)) {
         output.writeMessage(3, getVectorizer());
       }
       getUnknownFields().writeTo(output);
@@ -2138,15 +2155,15 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (object_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(1, getObject());
       }
-      if (config_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(2, getConfig());
       }
-      if (vectorizer_ != null) {
+      if (((bitField0_ & 0x00000004) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(3, getVectorizer());
       }
@@ -2326,13 +2343,21 @@ public static final class Builder extends
 
       // Construct using org.vdaas.vald.api.v1.payload.Update.ObjectRequest.newBuilder()
       private Builder() {
-
+        maybeForceBuilderInitialization();
       }
 
       private Builder(
           com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
         super(parent);
-
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3
+                .alwaysUseFieldBuilders) {
+          getObjectFieldBuilder();
+          getConfigFieldBuilder();
+          getVectorizerFieldBuilder();
+        }
       }
       @java.lang.Override
       public Builder clear() {
@@ -2386,21 +2411,26 @@ public org.vdaas.vald.api.v1.payload.Update.ObjectRequest buildPartial() {
 
       private void buildPartial0(org.vdaas.vald.api.v1.payload.Update.ObjectRequest result) {
         int from_bitField0_ = bitField0_;
+        int to_bitField0_ = 0;
         if (((from_bitField0_ & 0x00000001) != 0)) {
           result.object_ = objectBuilder_ == null
               ? object_
               : objectBuilder_.build();
+          to_bitField0_ |= 0x00000001;
         }
         if (((from_bitField0_ & 0x00000002) != 0)) {
           result.config_ = configBuilder_ == null
               ? config_
               : configBuilder_.build();
+          to_bitField0_ |= 0x00000002;
         }
         if (((from_bitField0_ & 0x00000004) != 0)) {
           result.vectorizer_ = vectorizerBuilder_ == null
               ? vectorizer_
               : vectorizerBuilder_.build();
+          to_bitField0_ |= 0x00000004;
         }
+        result.bitField0_ |= to_bitField0_;
       }
 
       @java.lang.Override
@@ -2606,8 +2636,10 @@ public Builder mergeObject(org.vdaas.vald.api.v1.payload.Object.Blob value) {
         } else {
           objectBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000001;
-        onChanged();
+        if (object_ != null) {
+          bitField0_ |= 0x00000001;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -2761,8 +2793,10 @@ public Builder mergeConfig(org.vdaas.vald.api.v1.payload.Update.Config value) {
         } else {
           configBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000002;
-        onChanged();
+        if (config_ != null) {
+          bitField0_ |= 0x00000002;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -2916,8 +2950,10 @@ public Builder mergeVectorizer(org.vdaas.vald.api.v1.payload.Filter.Target value
         } else {
           vectorizerBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000004;
-        onChanged();
+        if (vectorizer_ != null) {
+          bitField0_ |= 0x00000004;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -4051,6 +4087,7 @@ protected java.lang.Object newInstance(
               org.vdaas.vald.api.v1.payload.Update.Config.class, org.vdaas.vald.api.v1.payload.Update.Config.Builder.class);
     }
 
+    private int bitField0_;
     public static final int SKIP_STRICT_EXIST_CHECK_FIELD_NUMBER = 1;
     private boolean skipStrictExistCheck_ = false;
     /**
@@ -4078,7 +4115,7 @@ public boolean getSkipStrictExistCheck() {
      */
     @java.lang.Override
     public boolean hasFilters() {
-      return filters_ != null;
+      return ((bitField0_ & 0x00000001) != 0);
     }
     /**
      * 
@@ -4152,7 +4189,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output)
       if (skipStrictExistCheck_ != false) {
         output.writeBool(1, skipStrictExistCheck_);
       }
-      if (filters_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         output.writeMessage(2, getFilters());
       }
       if (timestamp_ != 0L) {
@@ -4174,7 +4211,7 @@ public int getSerializedSize() {
         size += com.google.protobuf.CodedOutputStream
           .computeBoolSize(1, skipStrictExistCheck_);
       }
-      if (filters_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(2, getFilters());
       }
@@ -4359,13 +4396,19 @@ public static final class Builder extends
 
       // Construct using org.vdaas.vald.api.v1.payload.Update.Config.newBuilder()
       private Builder() {
-
+        maybeForceBuilderInitialization();
       }
 
       private Builder(
           com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
         super(parent);
-
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3
+                .alwaysUseFieldBuilders) {
+          getFiltersFieldBuilder();
+        }
       }
       @java.lang.Override
       public Builder clear() {
@@ -4415,10 +4458,12 @@ private void buildPartial0(org.vdaas.vald.api.v1.payload.Update.Config result) {
         if (((from_bitField0_ & 0x00000001) != 0)) {
           result.skipStrictExistCheck_ = skipStrictExistCheck_;
         }
+        int to_bitField0_ = 0;
         if (((from_bitField0_ & 0x00000002) != 0)) {
           result.filters_ = filtersBuilder_ == null
               ? filters_
               : filtersBuilder_.build();
+          to_bitField0_ |= 0x00000001;
         }
         if (((from_bitField0_ & 0x00000004) != 0)) {
           result.timestamp_ = timestamp_;
@@ -4426,6 +4471,7 @@ private void buildPartial0(org.vdaas.vald.api.v1.payload.Update.Config result) {
         if (((from_bitField0_ & 0x00000008) != 0)) {
           result.disableBalancedUpdate_ = disableBalancedUpdate_;
         }
+        result.bitField0_ |= to_bitField0_;
       }
 
       @java.lang.Override
@@ -4679,8 +4725,10 @@ public Builder mergeFilters(org.vdaas.vald.api.v1.payload.Filter.Config value) {
         } else {
           filtersBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000002;
-        onChanged();
+        if (filters_ != null) {
+          bitField0_ |= 0x00000002;
+          onChanged();
+        }
         return this;
       }
       /**
diff --git a/src/main/java/org/vdaas/vald/api/v1/payload/Upsert.java b/src/main/java/org/vdaas/vald/api/v1/payload/Upsert.java
index 77bc064e..10ab43f6 100644
--- a/src/main/java/org/vdaas/vald/api/v1/payload/Upsert.java
+++ b/src/main/java/org/vdaas/vald/api/v1/payload/Upsert.java
@@ -139,6 +139,7 @@ protected java.lang.Object newInstance(
               org.vdaas.vald.api.v1.payload.Upsert.Request.class, org.vdaas.vald.api.v1.payload.Upsert.Request.Builder.class);
     }
 
+    private int bitField0_;
     public static final int VECTOR_FIELD_NUMBER = 1;
     private org.vdaas.vald.api.v1.payload.Object.Vector vector_;
     /**
@@ -151,7 +152,7 @@ protected java.lang.Object newInstance(
      */
     @java.lang.Override
     public boolean hasVector() {
-      return vector_ != null;
+      return ((bitField0_ & 0x00000001) != 0);
     }
     /**
      * 
@@ -189,7 +190,7 @@ public org.vdaas.vald.api.v1.payload.Object.VectorOrBuilder getVectorOrBuilder()
      */
     @java.lang.Override
     public boolean hasConfig() {
-      return config_ != null;
+      return ((bitField0_ & 0x00000002) != 0);
     }
     /**
      * 
@@ -229,10 +230,10 @@ public final boolean isInitialized() {
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output)
                         throws java.io.IOException {
-      if (vector_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         output.writeMessage(1, getVector());
       }
-      if (config_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         output.writeMessage(2, getConfig());
       }
       getUnknownFields().writeTo(output);
@@ -244,11 +245,11 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (vector_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(1, getVector());
       }
-      if (config_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(2, getConfig());
       }
@@ -419,13 +420,20 @@ public static final class Builder extends
 
       // Construct using org.vdaas.vald.api.v1.payload.Upsert.Request.newBuilder()
       private Builder() {
-
+        maybeForceBuilderInitialization();
       }
 
       private Builder(
           com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
         super(parent);
-
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3
+                .alwaysUseFieldBuilders) {
+          getVectorFieldBuilder();
+          getConfigFieldBuilder();
+        }
       }
       @java.lang.Override
       public Builder clear() {
@@ -474,16 +482,20 @@ public org.vdaas.vald.api.v1.payload.Upsert.Request buildPartial() {
 
       private void buildPartial0(org.vdaas.vald.api.v1.payload.Upsert.Request result) {
         int from_bitField0_ = bitField0_;
+        int to_bitField0_ = 0;
         if (((from_bitField0_ & 0x00000001) != 0)) {
           result.vector_ = vectorBuilder_ == null
               ? vector_
               : vectorBuilder_.build();
+          to_bitField0_ |= 0x00000001;
         }
         if (((from_bitField0_ & 0x00000002) != 0)) {
           result.config_ = configBuilder_ == null
               ? config_
               : configBuilder_.build();
+          to_bitField0_ |= 0x00000002;
         }
+        result.bitField0_ |= to_bitField0_;
       }
 
       @java.lang.Override
@@ -679,8 +691,10 @@ public Builder mergeVector(org.vdaas.vald.api.v1.payload.Object.Vector value) {
         } else {
           vectorBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000001;
-        onChanged();
+        if (vector_ != null) {
+          bitField0_ |= 0x00000001;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -834,8 +848,10 @@ public Builder mergeConfig(org.vdaas.vald.api.v1.payload.Upsert.Config value) {
         } else {
           configBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000002;
-        onChanged();
+        if (config_ != null) {
+          bitField0_ |= 0x00000002;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -1992,6 +2008,7 @@ protected java.lang.Object newInstance(
               org.vdaas.vald.api.v1.payload.Upsert.ObjectRequest.class, org.vdaas.vald.api.v1.payload.Upsert.ObjectRequest.Builder.class);
     }
 
+    private int bitField0_;
     public static final int OBJECT_FIELD_NUMBER = 1;
     private org.vdaas.vald.api.v1.payload.Object.Blob object_;
     /**
@@ -2004,7 +2021,7 @@ protected java.lang.Object newInstance(
      */
     @java.lang.Override
     public boolean hasObject() {
-      return object_ != null;
+      return ((bitField0_ & 0x00000001) != 0);
     }
     /**
      * 
@@ -2042,7 +2059,7 @@ public org.vdaas.vald.api.v1.payload.Object.BlobOrBuilder getObjectOrBuilder() {
      */
     @java.lang.Override
     public boolean hasConfig() {
-      return config_ != null;
+      return ((bitField0_ & 0x00000002) != 0);
     }
     /**
      * 
@@ -2080,7 +2097,7 @@ public org.vdaas.vald.api.v1.payload.Upsert.ConfigOrBuilder getConfigOrBuilder()
      */
     @java.lang.Override
     public boolean hasVectorizer() {
-      return vectorizer_ != null;
+      return ((bitField0_ & 0x00000004) != 0);
     }
     /**
      * 
@@ -2120,13 +2137,13 @@ public final boolean isInitialized() {
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output)
                         throws java.io.IOException {
-      if (object_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         output.writeMessage(1, getObject());
       }
-      if (config_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         output.writeMessage(2, getConfig());
       }
-      if (vectorizer_ != null) {
+      if (((bitField0_ & 0x00000004) != 0)) {
         output.writeMessage(3, getVectorizer());
       }
       getUnknownFields().writeTo(output);
@@ -2138,15 +2155,15 @@ public int getSerializedSize() {
       if (size != -1) return size;
 
       size = 0;
-      if (object_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(1, getObject());
       }
-      if (config_ != null) {
+      if (((bitField0_ & 0x00000002) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(2, getConfig());
       }
-      if (vectorizer_ != null) {
+      if (((bitField0_ & 0x00000004) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(3, getVectorizer());
       }
@@ -2326,13 +2343,21 @@ public static final class Builder extends
 
       // Construct using org.vdaas.vald.api.v1.payload.Upsert.ObjectRequest.newBuilder()
       private Builder() {
-
+        maybeForceBuilderInitialization();
       }
 
       private Builder(
           com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
         super(parent);
-
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3
+                .alwaysUseFieldBuilders) {
+          getObjectFieldBuilder();
+          getConfigFieldBuilder();
+          getVectorizerFieldBuilder();
+        }
       }
       @java.lang.Override
       public Builder clear() {
@@ -2386,21 +2411,26 @@ public org.vdaas.vald.api.v1.payload.Upsert.ObjectRequest buildPartial() {
 
       private void buildPartial0(org.vdaas.vald.api.v1.payload.Upsert.ObjectRequest result) {
         int from_bitField0_ = bitField0_;
+        int to_bitField0_ = 0;
         if (((from_bitField0_ & 0x00000001) != 0)) {
           result.object_ = objectBuilder_ == null
               ? object_
               : objectBuilder_.build();
+          to_bitField0_ |= 0x00000001;
         }
         if (((from_bitField0_ & 0x00000002) != 0)) {
           result.config_ = configBuilder_ == null
               ? config_
               : configBuilder_.build();
+          to_bitField0_ |= 0x00000002;
         }
         if (((from_bitField0_ & 0x00000004) != 0)) {
           result.vectorizer_ = vectorizerBuilder_ == null
               ? vectorizer_
               : vectorizerBuilder_.build();
+          to_bitField0_ |= 0x00000004;
         }
+        result.bitField0_ |= to_bitField0_;
       }
 
       @java.lang.Override
@@ -2606,8 +2636,10 @@ public Builder mergeObject(org.vdaas.vald.api.v1.payload.Object.Blob value) {
         } else {
           objectBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000001;
-        onChanged();
+        if (object_ != null) {
+          bitField0_ |= 0x00000001;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -2761,8 +2793,10 @@ public Builder mergeConfig(org.vdaas.vald.api.v1.payload.Upsert.Config value) {
         } else {
           configBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000002;
-        onChanged();
+        if (config_ != null) {
+          bitField0_ |= 0x00000002;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -2916,8 +2950,10 @@ public Builder mergeVectorizer(org.vdaas.vald.api.v1.payload.Filter.Target value
         } else {
           vectorizerBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000004;
-        onChanged();
+        if (vectorizer_ != null) {
+          bitField0_ |= 0x00000004;
+          onChanged();
+        }
         return this;
       }
       /**
@@ -4051,6 +4087,7 @@ protected java.lang.Object newInstance(
               org.vdaas.vald.api.v1.payload.Upsert.Config.class, org.vdaas.vald.api.v1.payload.Upsert.Config.Builder.class);
     }
 
+    private int bitField0_;
     public static final int SKIP_STRICT_EXIST_CHECK_FIELD_NUMBER = 1;
     private boolean skipStrictExistCheck_ = false;
     /**
@@ -4078,7 +4115,7 @@ public boolean getSkipStrictExistCheck() {
      */
     @java.lang.Override
     public boolean hasFilters() {
-      return filters_ != null;
+      return ((bitField0_ & 0x00000001) != 0);
     }
     /**
      * 
@@ -4152,7 +4189,7 @@ public void writeTo(com.google.protobuf.CodedOutputStream output)
       if (skipStrictExistCheck_ != false) {
         output.writeBool(1, skipStrictExistCheck_);
       }
-      if (filters_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         output.writeMessage(2, getFilters());
       }
       if (timestamp_ != 0L) {
@@ -4174,7 +4211,7 @@ public int getSerializedSize() {
         size += com.google.protobuf.CodedOutputStream
           .computeBoolSize(1, skipStrictExistCheck_);
       }
-      if (filters_ != null) {
+      if (((bitField0_ & 0x00000001) != 0)) {
         size += com.google.protobuf.CodedOutputStream
           .computeMessageSize(2, getFilters());
       }
@@ -4359,13 +4396,19 @@ public static final class Builder extends
 
       // Construct using org.vdaas.vald.api.v1.payload.Upsert.Config.newBuilder()
       private Builder() {
-
+        maybeForceBuilderInitialization();
       }
 
       private Builder(
           com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
         super(parent);
-
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3
+                .alwaysUseFieldBuilders) {
+          getFiltersFieldBuilder();
+        }
       }
       @java.lang.Override
       public Builder clear() {
@@ -4415,10 +4458,12 @@ private void buildPartial0(org.vdaas.vald.api.v1.payload.Upsert.Config result) {
         if (((from_bitField0_ & 0x00000001) != 0)) {
           result.skipStrictExistCheck_ = skipStrictExistCheck_;
         }
+        int to_bitField0_ = 0;
         if (((from_bitField0_ & 0x00000002) != 0)) {
           result.filters_ = filtersBuilder_ == null
               ? filters_
               : filtersBuilder_.build();
+          to_bitField0_ |= 0x00000001;
         }
         if (((from_bitField0_ & 0x00000004) != 0)) {
           result.timestamp_ = timestamp_;
@@ -4426,6 +4471,7 @@ private void buildPartial0(org.vdaas.vald.api.v1.payload.Upsert.Config result) {
         if (((from_bitField0_ & 0x00000008) != 0)) {
           result.disableBalancedUpdate_ = disableBalancedUpdate_;
         }
+        result.bitField0_ |= to_bitField0_;
       }
 
       @java.lang.Override
@@ -4679,8 +4725,10 @@ public Builder mergeFilters(org.vdaas.vald.api.v1.payload.Filter.Config value) {
         } else {
           filtersBuilder_.mergeFrom(value);
         }
-        bitField0_ |= 0x00000002;
-        onChanged();
+        if (filters_ != null) {
+          bitField0_ |= 0x00000002;
+          onChanged();
+        }
         return this;
       }
       /**
diff --git a/src/main/java/org/vdaas/vald/api/v1/payload/ValdPayload.java b/src/main/java/org/vdaas/vald/api/v1/payload/ValdPayload.java
index 1f935a2a..cd54af4b 100644
--- a/src/main/java/org/vdaas/vald/api/v1/payload/ValdPayload.java
+++ b/src/main/java/org/vdaas/vald/api/v1/payload/ValdPayload.java
@@ -189,6 +189,16 @@ public static void registerAllExtensions(
   static final 
     com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
       internal_static_payload_v1_Remove_MultiRequest_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+    internal_static_payload_v1_Remove_TimestampRequest_descriptor;
+  static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_payload_v1_Remove_TimestampRequest_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+    internal_static_payload_v1_Remove_Timestamp_descriptor;
+  static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_payload_v1_Remove_Timestamp_fieldAccessorTable;
   static final com.google.protobuf.Descriptors.Descriptor
     internal_static_payload_v1_Remove_Config_descriptor;
   static final 
@@ -269,6 +279,21 @@ public static void registerAllExtensions(
   static final 
     com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
       internal_static_payload_v1_Object_Locations_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+    internal_static_payload_v1_Object_List_descriptor;
+  static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_payload_v1_Object_List_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+    internal_static_payload_v1_Object_List_Request_descriptor;
+  static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_payload_v1_Object_List_Request_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+    internal_static_payload_v1_Object_List_Response_descriptor;
+  static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_payload_v1_Object_List_Response_fieldAccessorTable;
   static final com.google.protobuf.Descriptors.Descriptor
     internal_static_payload_v1_Control_descriptor;
   static final 
@@ -372,140 +397,153 @@ public static void registerAllExtensions(
       "ayload.v1\032Agithub.com/envoyproxy/protoc-" +
       "gen-validate/validate/validate.proto\0328gi" +
       "thub.com/googleapis/googleapis/google/rp" +
-      "c/status.proto\"\375\010\n\006Search\032N\n\007Request\022\030\n\006" +
-      "vector\030\001 \003(\002B\010\372B\005\222\001\002\010\002\022)\n\006config\030\002 \001(\0132\031" +
-      ".payload.v1.Search.Config\032<\n\014MultiReques" +
-      "t\022,\n\010requests\030\001 \003(\0132\032.payload.v1.Search." +
-      "Request\032B\n\tIDRequest\022\n\n\002id\030\001 \001(\t\022)\n\006conf" +
-      "ig\030\002 \001(\0132\031.payload.v1.Search.Config\032@\n\016M" +
-      "ultiIDRequest\022.\n\010requests\030\001 \003(\0132\034.payloa" +
-      "d.v1.Search.IDRequest\032y\n\rObjectRequest\022\016" +
-      "\n\006object\030\001 \001(\014\022)\n\006config\030\002 \001(\0132\031.payload" +
-      ".v1.Search.Config\022-\n\nvectorizer\030\003 \001(\0132\031." +
+      "c/status.proto\032]github.com/planetscale/v" +
+      "tprotobuf/include/github.com/planetscale" +
+      "/vtprotobuf/vtproto/ext.proto\"\375\010\n\006Search" +
+      "\032N\n\007Request\022\030\n\006vector\030\001 \003(\002B\010\372B\005\222\001\002\010\002\022)\n" +
+      "\006config\030\002 \001(\0132\031.payload.v1.Search.Config" +
+      "\032<\n\014MultiRequest\022,\n\010requests\030\001 \003(\0132\032.pay" +
+      "load.v1.Search.Request\032B\n\tIDRequest\022\n\n\002i" +
+      "d\030\001 \001(\t\022)\n\006config\030\002 \001(\0132\031.payload.v1.Sea" +
+      "rch.Config\032@\n\016MultiIDRequest\022.\n\010requests" +
+      "\030\001 \003(\0132\034.payload.v1.Search.IDRequest\032y\n\r" +
+      "ObjectRequest\022\016\n\006object\030\001 \001(\014\022)\n\006config\030" +
+      "\002 \001(\0132\031.payload.v1.Search.Config\022-\n\nvect" +
+      "orizer\030\003 \001(\0132\031.payload.v1.Filter.Target\032" +
+      "H\n\022MultiObjectRequest\0222\n\010requests\030\001 \003(\0132" +
+      " .payload.v1.Search.ObjectRequest\032\255\002\n\006Co" +
+      "nfig\022\022\n\nrequest_id\030\001 \001(\t\022\024\n\003num\030\002 \001(\rB\007\372" +
+      "B\004*\002(\001\022\016\n\006radius\030\003 \001(\002\022\017\n\007epsilon\030\004 \001(\002\022" +
+      "\017\n\007timeout\030\005 \001(\003\0222\n\017ingress_filters\030\006 \001(" +
+      "\0132\031.payload.v1.Filter.Config\0221\n\016egress_f" +
+      "ilters\030\007 \001(\0132\031.payload.v1.Filter.Config\022" +
+      "\030\n\007min_num\030\010 \001(\rB\007\372B\004*\002(\000\022F\n\025aggregation" +
+      "_algorithm\030\t \001(\0162\'.payload.v1.Search.Agg" +
+      "regationAlgorithm\032L\n\010Response\022\022\n\nrequest" +
+      "_id\030\001 \001(\t\022,\n\007results\030\002 \003(\0132\033.payload.v1." +
+      "Object.Distance\032;\n\tResponses\022.\n\tresponse" +
+      "s\030\001 \003(\0132\033.payload.v1.Search.Response\032r\n\016" +
+      "StreamResponse\022/\n\010response\030\001 \001(\0132\033.paylo" +
+      "ad.v1.Search.ResponseH\000\022$\n\006status\030\002 \001(\0132" +
+      "\022.google.rpc.StatusH\000B\t\n\007payload\"k\n\024Aggr" +
+      "egationAlgorithm\022\013\n\007Unknown\020\000\022\023\n\017Concurr" +
+      "entQueue\020\001\022\r\n\tSortSlice\020\002\022\021\n\rSortPoolSli" +
+      "ce\020\003\022\017\n\013PairingHeap\020\004\"d\n\006Filter\032$\n\006Targe" +
+      "t\022\014\n\004host\030\001 \001(\t\022\014\n\004port\030\002 \001(\r\0324\n\006Config\022" +
+      "*\n\007targets\030\001 \003(\0132\031.payload.v1.Filter.Tar" +
+      "get\"\372\003\n\006Insert\032i\n\007Request\0223\n\006vector\030\001 \001(" +
+      "\0132\031.payload.v1.Object.VectorB\010\372B\005\222\001\002\010\002\022)" +
+      "\n\006config\030\002 \001(\0132\031.payload.v1.Insert.Confi" +
+      "g\032<\n\014MultiRequest\022,\n\010requests\030\001 \003(\0132\032.pa" +
+      "yload.v1.Insert.Request\032\222\001\n\rObjectReques" +
+      "t\022\'\n\006object\030\001 \001(\0132\027.payload.v1.Object.Bl" +
+      "ob\022)\n\006config\030\002 \001(\0132\031.payload.v1.Insert.C" +
+      "onfig\022-\n\nvectorizer\030\003 \001(\0132\031.payload.v1.F" +
+      "ilter.Target\032H\n\022MultiObjectRequest\0222\n\010re" +
+      "quests\030\001 \003(\0132 .payload.v1.Insert.ObjectR" +
+      "equest\032h\n\006Config\022\037\n\027skip_strict_exist_ch" +
+      "eck\030\001 \001(\010\022*\n\007filters\030\002 \001(\0132\031.payload.v1." +
+      "Filter.Config\022\021\n\ttimestamp\030\003 \001(\003\"\234\004\n\006Upd" +
+      "ate\032i\n\007Request\0223\n\006vector\030\001 \001(\0132\031.payload" +
+      ".v1.Object.VectorB\010\372B\005\222\001\002\010\002\022)\n\006config\030\002 " +
+      "\001(\0132\031.payload.v1.Update.Config\032<\n\014MultiR" +
+      "equest\022,\n\010requests\030\001 \003(\0132\032.payload.v1.Up" +
+      "date.Request\032\222\001\n\rObjectRequest\022\'\n\006object" +
+      "\030\001 \001(\0132\027.payload.v1.Object.Blob\022)\n\006confi" +
+      "g\030\002 \001(\0132\031.payload.v1.Update.Config\022-\n\nve" +
+      "ctorizer\030\003 \001(\0132\031.payload.v1.Filter.Targe" +
+      "t\032H\n\022MultiObjectRequest\0222\n\010requests\030\001 \003(" +
+      "\0132 .payload.v1.Update.ObjectRequest\032\211\001\n\006" +
+      "Config\022\037\n\027skip_strict_exist_check\030\001 \001(\010\022" +
+      "*\n\007filters\030\002 \001(\0132\031.payload.v1.Filter.Con" +
+      "fig\022\021\n\ttimestamp\030\003 \001(\003\022\037\n\027disable_balanc" +
+      "ed_update\030\004 \001(\010\"\234\004\n\006Upsert\032i\n\007Request\0223\n" +
+      "\006vector\030\001 \001(\0132\031.payload.v1.Object.Vector" +
+      "B\010\372B\005\222\001\002\010\002\022)\n\006config\030\002 \001(\0132\031.payload.v1." +
+      "Upsert.Config\032<\n\014MultiRequest\022,\n\010request" +
+      "s\030\001 \003(\0132\032.payload.v1.Upsert.Request\032\222\001\n\r" +
+      "ObjectRequest\022\'\n\006object\030\001 \001(\0132\027.payload." +
+      "v1.Object.Blob\022)\n\006config\030\002 \001(\0132\031.payload" +
+      ".v1.Upsert.Config\022-\n\nvectorizer\030\003 \001(\0132\031." +
       "payload.v1.Filter.Target\032H\n\022MultiObjectR" +
-      "equest\0222\n\010requests\030\001 \003(\0132 .payload.v1.Se" +
-      "arch.ObjectRequest\032\255\002\n\006Config\022\022\n\nrequest" +
-      "_id\030\001 \001(\t\022\024\n\003num\030\002 \001(\rB\007\372B\004*\002(\001\022\016\n\006radiu" +
-      "s\030\003 \001(\002\022\017\n\007epsilon\030\004 \001(\002\022\017\n\007timeout\030\005 \001(" +
-      "\003\0222\n\017ingress_filters\030\006 \001(\0132\031.payload.v1." +
-      "Filter.Config\0221\n\016egress_filters\030\007 \001(\0132\031." +
-      "payload.v1.Filter.Config\022\030\n\007min_num\030\010 \001(" +
-      "\rB\007\372B\004*\002(\000\022F\n\025aggregation_algorithm\030\t \001(" +
-      "\0162\'.payload.v1.Search.AggregationAlgorit" +
-      "hm\032L\n\010Response\022\022\n\nrequest_id\030\001 \001(\t\022,\n\007re" +
-      "sults\030\002 \003(\0132\033.payload.v1.Object.Distance" +
-      "\032;\n\tResponses\022.\n\tresponses\030\001 \003(\0132\033.paylo" +
-      "ad.v1.Search.Response\032r\n\016StreamResponse\022" +
-      "/\n\010response\030\001 \001(\0132\033.payload.v1.Search.Re" +
-      "sponseH\000\022$\n\006status\030\002 \001(\0132\022.google.rpc.St" +
-      "atusH\000B\t\n\007payload\"k\n\024AggregationAlgorith" +
-      "m\022\013\n\007Unknown\020\000\022\023\n\017ConcurrentQueue\020\001\022\r\n\tS" +
-      "ortSlice\020\002\022\021\n\rSortPoolSlice\020\003\022\017\n\013Pairing" +
-      "Heap\020\004\"d\n\006Filter\032$\n\006Target\022\014\n\004host\030\001 \001(\t" +
-      "\022\014\n\004port\030\002 \001(\r\0324\n\006Config\022*\n\007targets\030\001 \003(" +
-      "\0132\031.payload.v1.Filter.Target\"\372\003\n\006Insert\032" +
-      "i\n\007Request\0223\n\006vector\030\001 \001(\0132\031.payload.v1." +
-      "Object.VectorB\010\372B\005\222\001\002\010\002\022)\n\006config\030\002 \001(\0132" +
-      "\031.payload.v1.Insert.Config\032<\n\014MultiReque" +
-      "st\022,\n\010requests\030\001 \003(\0132\032.payload.v1.Insert" +
-      ".Request\032\222\001\n\rObjectRequest\022\'\n\006object\030\001 \001" +
-      "(\0132\027.payload.v1.Object.Blob\022)\n\006config\030\002 " +
-      "\001(\0132\031.payload.v1.Insert.Config\022-\n\nvector" +
-      "izer\030\003 \001(\0132\031.payload.v1.Filter.Target\032H\n" +
-      "\022MultiObjectRequest\0222\n\010requests\030\001 \003(\0132 ." +
-      "payload.v1.Insert.ObjectRequest\032h\n\006Confi" +
-      "g\022\037\n\027skip_strict_exist_check\030\001 \001(\010\022*\n\007fi" +
-      "lters\030\002 \001(\0132\031.payload.v1.Filter.Config\022\021" +
-      "\n\ttimestamp\030\003 \001(\003\"\234\004\n\006Update\032i\n\007Request\022" +
-      "3\n\006vector\030\001 \001(\0132\031.payload.v1.Object.Vect" +
-      "orB\010\372B\005\222\001\002\010\002\022)\n\006config\030\002 \001(\0132\031.payload.v" +
-      "1.Update.Config\032<\n\014MultiRequest\022,\n\010reque" +
-      "sts\030\001 \003(\0132\032.payload.v1.Update.Request\032\222\001" +
-      "\n\rObjectRequest\022\'\n\006object\030\001 \001(\0132\027.payloa" +
-      "d.v1.Object.Blob\022)\n\006config\030\002 \001(\0132\031.paylo" +
-      "ad.v1.Update.Config\022-\n\nvectorizer\030\003 \001(\0132" +
-      "\031.payload.v1.Filter.Target\032H\n\022MultiObjec" +
-      "tRequest\0222\n\010requests\030\001 \003(\0132 .payload.v1." +
-      "Update.ObjectRequest\032\211\001\n\006Config\022\037\n\027skip_" +
-      "strict_exist_check\030\001 \001(\010\022*\n\007filters\030\002 \001(" +
-      "\0132\031.payload.v1.Filter.Config\022\021\n\ttimestam" +
-      "p\030\003 \001(\003\022\037\n\027disable_balanced_update\030\004 \001(\010" +
-      "\"\234\004\n\006Upsert\032i\n\007Request\0223\n\006vector\030\001 \001(\0132\031" +
-      ".payload.v1.Object.VectorB\010\372B\005\222\001\002\010\002\022)\n\006c" +
-      "onfig\030\002 \001(\0132\031.payload.v1.Upsert.Config\032<" +
-      "\n\014MultiRequest\022,\n\010requests\030\001 \003(\0132\032.paylo" +
-      "ad.v1.Upsert.Request\032\222\001\n\rObjectRequest\022\'" +
-      "\n\006object\030\001 \001(\0132\027.payload.v1.Object.Blob\022" +
-      ")\n\006config\030\002 \001(\0132\031.payload.v1.Upsert.Conf" +
-      "ig\022-\n\nvectorizer\030\003 \001(\0132\031.payload.v1.Filt" +
-      "er.Target\032H\n\022MultiObjectRequest\0222\n\010reque" +
-      "sts\030\001 \003(\0132 .payload.v1.Upsert.ObjectRequ" +
-      "est\032\211\001\n\006Config\022\037\n\027skip_strict_exist_chec" +
-      "k\030\001 \001(\010\022*\n\007filters\030\002 \001(\0132\031.payload.v1.Fi" +
-      "lter.Config\022\021\n\ttimestamp\030\003 \001(\003\022\037\n\027disabl" +
-      "e_balanced_update\030\004 \001(\010\"\335\001\n\006Remove\032W\n\007Re" +
-      "quest\022!\n\002id\030\001 \001(\0132\025.payload.v1.Object.ID" +
-      "\022)\n\006config\030\002 \001(\0132\031.payload.v1.Remove.Con" +
-      "fig\032<\n\014MultiRequest\022,\n\010requests\030\001 \003(\0132\032." +
-      "payload.v1.Remove.Request\032<\n\006Config\022\037\n\027s" +
-      "kip_strict_exist_check\030\001 \001(\010\022\021\n\ttimestam" +
-      "p\030\003 \001(\003\"\310\007\n\006Object\032h\n\rVectorRequest\022+\n\002i" +
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-      "\022*\n\007filters\030\002 \001(\0132\031.payload.v1.Filter.Co" +
-      "nfig\032(\n\010Distance\022\n\n\002id\030\001 \001(\t\022\020\n\010distance" +
-      "\030\002 \001(\002\032r\n\016StreamDistance\022/\n\010distance\030\001 \001" +
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-      "ids\030\001 \003(\t\0327\n\006Vector\022\023\n\002id\030\001 \001(\tB\007\372B\004r\002\020\001" +
-      "\022\030\n\006vector\030\002 \003(\002B\010\372B\005\222\001\002\010\002\0325\n\007Vectors\022*\n" +
-      "\007vectors\030\001 \003(\0132\031.payload.v1.Object.Vecto" +
-      "r\032l\n\014StreamVector\022+\n\006vector\030\001 \001(\0132\031.payl" +
-      "oad.v1.Object.VectorH\000\022$\n\006status\030\002 \001(\0132\022" +
-      ".google.rpc.StatusH\000B\t\n\007payload\032.\n\rResha" +
-      "peVector\022\016\n\006object\030\001 \001(\014\022\r\n\005shape\030\002 \003(\005\032" +
-      "+\n\004Blob\022\023\n\002id\030\001 \001(\tB\007\372B\004r\002\020\001\022\016\n\006object\030\002" +
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-      "ogle.rpc.StatusH\000B\t\n\007payload\0323\n\010Location" +
-      "\022\014\n\004name\030\001 \001(\t\022\014\n\004uuid\030\002 \001(\t\022\013\n\003ips\030\003 \003(" +
-      "\t\032r\n\016StreamLocation\022/\n\010location\030\001 \001(\0132\033." +
-      "payload.v1.Object.LocationH\000\022$\n\006status\030\002" +
-      " \001(\0132\022.google.rpc.StatusH\000B\t\n\007payload\032;\n" +
-      "\tLocations\022.\n\tlocations\030\001 \003(\0132\033.payload." +
-      "v1.Object.Location\";\n\007Control\0320\n\022CreateI" +
-      "ndexRequest\022\032\n\tpool_size\030\001 \001(\rB\007\372B\004*\002(\000\"" +
-      "O\n\nDiscoverer\032A\n\007Request\022\025\n\004name\030\001 \001(\tB\007" +
-      "\372B\004r\002\020\001\022\021\n\tnamespace\030\002 \001(\t\022\014\n\004node\030\003 \001(\t" +
-      "\"\210\006\n\004Info\032\227\001\n\005Index\032N\n\005Count\022\016\n\006stored\030\001" +
-      " \001(\r\022\023\n\013uncommitted\030\002 \001(\r\022\020\n\010indexing\030\003 " +
-      "\001(\010\022\016\n\006saving\030\004 \001(\010\032>\n\004UUID\032\031\n\tCommitted" +
-      "\022\014\n\004uuid\030\001 \001(\t\032\033\n\013Uncommitted\022\014\n\004uuid\030\001 " +
-      "\001(\t\032\276\001\n\003Pod\022\020\n\010app_name\030\001 \001(\t\022\014\n\004name\030\002 " +
-      "\001(\t\022\021\n\tnamespace\030\003 \001(\t\022\023\n\002ip\030\004 \001(\tB\007\372B\004r" +
-      "\002x\001\022!\n\003cpu\030\005 \001(\0132\024.payload.v1.Info.CPU\022\'" +
-      "\n\006memory\030\006 \001(\0132\027.payload.v1.Info.Memory\022" +
-      "#\n\004node\030\007 \001(\0132\025.payload.v1.Info.Node\032\263\001\n" +
-      "\004Node\022\014\n\004name\030\001 \001(\t\022\025\n\rinternal_addr\030\002 \001" +
-      "(\t\022\025\n\rexternal_addr\030\003 \001(\t\022!\n\003cpu\030\004 \001(\0132\024" +
-      ".payload.v1.Info.CPU\022\'\n\006memory\030\005 \001(\0132\027.p" +
-      "ayload.v1.Info.Memory\022#\n\004Pods\030\006 \001(\0132\025.pa" +
-      "yload.v1.Info.Pods\0324\n\003CPU\022\r\n\005limit\030\001 \001(\001" +
-      "\022\017\n\007request\030\002 \001(\001\022\r\n\005usage\030\003 \001(\001\0327\n\006Memo" +
-      "ry\022\r\n\005limit\030\001 \001(\001\022\017\n\007request\030\002 \001(\001\022\r\n\005us" +
-      "age\030\003 \001(\001\0324\n\004Pods\022,\n\004pods\030\001 \003(\0132\024.payloa" +
-      "d.v1.Info.PodB\010\372B\005\222\001\002\010\001\0327\n\005Nodes\022.\n\005node" +
-      "s\030\001 \003(\0132\025.payload.v1.Info.NodeB\010\372B\005\222\001\002\010\001" +
-      "\032\021\n\003IPs\022\n\n\002ip\030\001 \003(\t\"\007\n\005EmptyBZ\n\035org.vdaa" +
-      "s.vald.api.v1.payloadB\013ValdPayloadP\001Z*gi" +
-      "thub.com/vdaas/vald/apis/grpc/v1/payload" +
-      "b\006proto3"
+      "equest\0222\n\010requests\030\001 \003(\0132 .payload.v1.Up" +
+      "sert.ObjectRequest\032\211\001\n\006Config\022\037\n\027skip_st" +
+      "rict_exist_check\030\001 \001(\010\022*\n\007filters\030\002 \001(\0132" +
+      "\031.payload.v1.Filter.Config\022\021\n\ttimestamp\030" +
+      "\003 \001(\003\022\037\n\027disable_balanced_update\030\004 \001(\010\"\271" +
+      "\003\n\006Remove\032W\n\007Request\022!\n\002id\030\001 \001(\0132\025.paylo" +
+      "ad.v1.Object.ID\022)\n\006config\030\002 \001(\0132\031.payloa" +
+      "d.v1.Remove.Config\032<\n\014MultiRequest\022,\n\010re" +
+      "quests\030\001 \003(\0132\032.payload.v1.Remove.Request" +
+      "\032D\n\020TimestampRequest\0220\n\ntimestamps\030\001 \003(\013" +
+      "2\034.payload.v1.Remove.Timestamp\032\223\001\n\tTimes" +
+      "tamp\022\021\n\ttimestamp\030\001 \001(\003\0227\n\010operator\030\002 \001(" +
+      "\0162%.payload.v1.Remove.Timestamp.Operator" +
+      "\":\n\010Operator\022\006\n\002Eq\020\000\022\006\n\002Ne\020\001\022\006\n\002Ge\020\002\022\006\n\002" +
+      "Gt\020\003\022\006\n\002Le\020\004\022\006\n\002Lt\020\005\032<\n\006Config\022\037\n\027skip_s" +
+      "trict_exist_check\030\001 \001(\010\022\021\n\ttimestamp\030\003 \001" +
+      "(\003\"\336\010\n\006Object\032h\n\rVectorRequest\022+\n\002id\030\001 \001" +
+      "(\0132\025.payload.v1.Object.IDB\010\372B\005\222\001\002\010\002\022*\n\007f" +
+      "ilters\030\002 \001(\0132\031.payload.v1.Filter.Config\032" +
+      "(\n\010Distance\022\n\n\002id\030\001 \001(\t\022\020\n\010distance\030\002 \001(" +
+      "\002\032r\n\016StreamDistance\022/\n\010distance\030\001 \001(\0132\033." +
+      "payload.v1.Object.DistanceH\000\022$\n\006status\030\002" +
+      " \001(\0132\022.google.rpc.StatusH\000B\t\n\007payload\032\031\n" +
+      "\002ID\022\023\n\002id\030\001 \001(\tB\007\372B\004r\002\020\001\032\022\n\003IDs\022\013\n\003ids\030\001" +
+      " \003(\t\032P\n\006Vector\022\023\n\002id\030\001 \001(\tB\007\372B\004r\002\020\001\022\030\n\006v" +
+      "ector\030\002 \003(\002B\010\372B\005\222\001\002\010\002\022\021\n\ttimestamp\030\003 \001(\003" +
+      ":\004\250\246\037\001\0325\n\007Vectors\022*\n\007vectors\030\001 \003(\0132\031.pay" +
+      "load.v1.Object.Vector\032l\n\014StreamVector\022+\n" +
+      "\006vector\030\001 \001(\0132\031.payload.v1.Object.Vector" +
+      "H\000\022$\n\006status\030\002 \001(\0132\022.google.rpc.StatusH\000" +
+      "B\t\n\007payload\032.\n\rReshapeVector\022\016\n\006object\030\001" +
+      " \001(\014\022\r\n\005shape\030\002 \003(\005\032+\n\004Blob\022\023\n\002id\030\001 \001(\tB" +
+      "\007\372B\004r\002\020\001\022\016\n\006object\030\002 \001(\014\032f\n\nStreamBlob\022\'" +
+      "\n\004blob\030\001 \001(\0132\027.payload.v1.Object.BlobH\000\022" +
+      "$\n\006status\030\002 \001(\0132\022.google.rpc.StatusH\000B\t\n" +
+      "\007payload\0323\n\010Location\022\014\n\004name\030\001 \001(\t\022\014\n\004uu" +
+      "id\030\002 \001(\t\022\013\n\003ips\030\003 \003(\t\032r\n\016StreamLocation\022" +
+      "/\n\010location\030\001 \001(\0132\033.payload.v1.Object.Lo" +
+      "cationH\000\022$\n\006status\030\002 \001(\0132\022.google.rpc.St" +
+      "atusH\000B\t\n\007payload\032;\n\tLocations\022.\n\tlocati" +
+      "ons\030\001 \003(\0132\033.payload.v1.Object.Location\032{" +
+      "\n\004List\032\t\n\007Request\032h\n\010Response\022+\n\006vector\030" +
+      "\001 \001(\0132\031.payload.v1.Object.VectorH\000\022$\n\006st" +
+      "atus\030\002 \001(\0132\022.google.rpc.StatusH\000B\t\n\007payl" +
+      "oad\";\n\007Control\0320\n\022CreateIndexRequest\022\032\n\t" +
+      "pool_size\030\001 \001(\rB\007\372B\004*\002(\000\"O\n\nDiscoverer\032A" +
+      "\n\007Request\022\025\n\004name\030\001 \001(\tB\007\372B\004r\002\020\001\022\021\n\tname" +
+      "space\030\002 \001(\t\022\014\n\004node\030\003 \001(\t\"\210\006\n\004Info\032\227\001\n\005I" +
+      "ndex\032N\n\005Count\022\016\n\006stored\030\001 \001(\r\022\023\n\013uncommi" +
+      "tted\030\002 \001(\r\022\020\n\010indexing\030\003 \001(\010\022\016\n\006saving\030\004" +
+      " \001(\010\032>\n\004UUID\032\031\n\tCommitted\022\014\n\004uuid\030\001 \001(\t\032" +
+      "\033\n\013Uncommitted\022\014\n\004uuid\030\001 \001(\t\032\276\001\n\003Pod\022\020\n\010" +
+      "app_name\030\001 \001(\t\022\014\n\004name\030\002 \001(\t\022\021\n\tnamespac" +
+      "e\030\003 \001(\t\022\023\n\002ip\030\004 \001(\tB\007\372B\004r\002x\001\022!\n\003cpu\030\005 \001(" +
+      "\0132\024.payload.v1.Info.CPU\022\'\n\006memory\030\006 \001(\0132" +
+      "\027.payload.v1.Info.Memory\022#\n\004node\030\007 \001(\0132\025" +
+      ".payload.v1.Info.Node\032\263\001\n\004Node\022\014\n\004name\030\001" +
+      " \001(\t\022\025\n\rinternal_addr\030\002 \001(\t\022\025\n\rexternal_" +
+      "addr\030\003 \001(\t\022!\n\003cpu\030\004 \001(\0132\024.payload.v1.Inf" +
+      "o.CPU\022\'\n\006memory\030\005 \001(\0132\027.payload.v1.Info." +
+      "Memory\022#\n\004Pods\030\006 \001(\0132\025.payload.v1.Info.P" +
+      "ods\0324\n\003CPU\022\r\n\005limit\030\001 \001(\001\022\017\n\007request\030\002 \001" +
+      "(\001\022\r\n\005usage\030\003 \001(\001\0327\n\006Memory\022\r\n\005limit\030\001 \001" +
+      "(\001\022\017\n\007request\030\002 \001(\001\022\r\n\005usage\030\003 \001(\001\0324\n\004Po" +
+      "ds\022,\n\004pods\030\001 \003(\0132\024.payload.v1.Info.PodB\010" +
+      "\372B\005\222\001\002\010\001\0327\n\005Nodes\022.\n\005nodes\030\001 \003(\0132\025.paylo" +
+      "ad.v1.Info.NodeB\010\372B\005\222\001\002\010\001\032\021\n\003IPs\022\n\n\002ip\030\001" +
+      " \003(\t\"\007\n\005EmptyBd\n\035org.vdaas.vald.api.v1.p" +
+      "ayloadB\013ValdPayloadP\001Z*github.com/vdaas/" +
+      "vald/apis/grpc/v1/payload\242\002\007Payloadb\006pro" +
+      "to3"
     };
     descriptor = com.google.protobuf.Descriptors.FileDescriptor
       .internalBuildGeneratedFileFrom(descriptorData,
         new com.google.protobuf.Descriptors.FileDescriptor[] {
           io.envoyproxy.pgv.validate.Validate.getDescriptor(),
           com.google.rpc.StatusProto.getDescriptor(),
+          com.google.protobuf.VTProto.getDescriptor(),
         });
     internal_static_payload_v1_Search_descriptor =
       getDescriptor().getMessageTypes().get(0);
@@ -717,8 +755,20 @@ public static void registerAllExtensions(
       com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
         internal_static_payload_v1_Remove_MultiRequest_descriptor,
         new java.lang.String[] { "Requests", });
-    internal_static_payload_v1_Remove_Config_descriptor =
+    internal_static_payload_v1_Remove_TimestampRequest_descriptor =
       internal_static_payload_v1_Remove_descriptor.getNestedTypes().get(2);
+    internal_static_payload_v1_Remove_TimestampRequest_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_payload_v1_Remove_TimestampRequest_descriptor,
+        new java.lang.String[] { "Timestamps", });
+    internal_static_payload_v1_Remove_Timestamp_descriptor =
+      internal_static_payload_v1_Remove_descriptor.getNestedTypes().get(3);
+    internal_static_payload_v1_Remove_Timestamp_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_payload_v1_Remove_Timestamp_descriptor,
+        new java.lang.String[] { "Timestamp", "Operator", });
+    internal_static_payload_v1_Remove_Config_descriptor =
+      internal_static_payload_v1_Remove_descriptor.getNestedTypes().get(4);
     internal_static_payload_v1_Remove_Config_fieldAccessorTable = new
       com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
         internal_static_payload_v1_Remove_Config_descriptor,
@@ -764,7 +814,7 @@ public static void registerAllExtensions(
     internal_static_payload_v1_Object_Vector_fieldAccessorTable = new
       com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
         internal_static_payload_v1_Object_Vector_descriptor,
-        new java.lang.String[] { "Id", "Vector", });
+        new java.lang.String[] { "Id", "Vector", "Timestamp", });
     internal_static_payload_v1_Object_Vectors_descriptor =
       internal_static_payload_v1_Object_descriptor.getNestedTypes().get(6);
     internal_static_payload_v1_Object_Vectors_fieldAccessorTable = new
@@ -813,6 +863,24 @@ public static void registerAllExtensions(
       com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
         internal_static_payload_v1_Object_Locations_descriptor,
         new java.lang.String[] { "Locations", });
+    internal_static_payload_v1_Object_List_descriptor =
+      internal_static_payload_v1_Object_descriptor.getNestedTypes().get(14);
+    internal_static_payload_v1_Object_List_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_payload_v1_Object_List_descriptor,
+        new java.lang.String[] { });
+    internal_static_payload_v1_Object_List_Request_descriptor =
+      internal_static_payload_v1_Object_List_descriptor.getNestedTypes().get(0);
+    internal_static_payload_v1_Object_List_Request_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_payload_v1_Object_List_Request_descriptor,
+        new java.lang.String[] { });
+    internal_static_payload_v1_Object_List_Response_descriptor =
+      internal_static_payload_v1_Object_List_descriptor.getNestedTypes().get(1);
+    internal_static_payload_v1_Object_List_Response_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_payload_v1_Object_List_Response_descriptor,
+        new java.lang.String[] { "Vector", "Status", "Payload", });
     internal_static_payload_v1_Control_descriptor =
       getDescriptor().getMessageTypes().get(7);
     internal_static_payload_v1_Control_fieldAccessorTable = new
@@ -924,10 +992,12 @@ public static void registerAllExtensions(
     com.google.protobuf.ExtensionRegistry registry =
         com.google.protobuf.ExtensionRegistry.newInstance();
     registry.add(io.envoyproxy.pgv.validate.Validate.rules);
+    registry.add(com.google.protobuf.VTProto.mempool);
     com.google.protobuf.Descriptors.FileDescriptor
         .internalUpdateFileDescriptor(descriptor, registry);
     io.envoyproxy.pgv.validate.Validate.getDescriptor();
     com.google.rpc.StatusProto.getDescriptor();
+    com.google.protobuf.VTProto.getDescriptor();
   }
 
   // @@protoc_insertion_point(outer_class_scope)
diff --git a/src/main/java/org/vdaas/vald/api/v1/rpc/BadRequest.java b/src/main/java/org/vdaas/vald/api/v1/rpc/BadRequest.java
new file mode 100644
index 00000000..1cf8358a
--- /dev/null
+++ b/src/main/java/org/vdaas/vald/api/v1/rpc/BadRequest.java
@@ -0,0 +1,1965 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: apis/proto/v1/rpc/error_details.proto
+
+package org.vdaas.vald.api.v1.rpc;
+
+/**
+ * 
+ * Describes violations in a client request. This error type focuses on the
+ * syntactic aspects of the request.
+ * 

+ *
+ * Protobuf type {@code rpc.v1.BadRequest}
+ */
+public final class BadRequest extends
+    com.google.protobuf.GeneratedMessageV3 implements
+    // @@protoc_insertion_point(message_implements:rpc.v1.BadRequest)
+    BadRequestOrBuilder {
+private static final long serialVersionUID = 0L;
+  // Use BadRequest.newBuilder() to construct.
+  private BadRequest(com.google.protobuf.GeneratedMessageV3.Builder builder) {
+    super(builder);
+  }
+  private BadRequest() {
+    fieldViolations_ = java.util.Collections.emptyList();
+  }
+
+  @java.lang.Override
+  @SuppressWarnings({"unused"})
+  protected java.lang.Object newInstance(
+      UnusedPrivateParameter unused) {
+    return new BadRequest();
+  }
+
+  public static final com.google.protobuf.Descriptors.Descriptor
+      getDescriptor() {
+    return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_BadRequest_descriptor;
+  }
+
+  @java.lang.Override
+  protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internalGetFieldAccessorTable() {
+    return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_BadRequest_fieldAccessorTable
+        .ensureFieldAccessorsInitialized(
+            org.vdaas.vald.api.v1.rpc.BadRequest.class, org.vdaas.vald.api.v1.rpc.BadRequest.Builder.class);
+  }
+
+  public interface FieldViolationOrBuilder extends
+      // @@protoc_insertion_point(interface_extends:rpc.v1.BadRequest.FieldViolation)
+      com.google.protobuf.MessageOrBuilder {
+
+    /**
+     * 
+     * A path that leads to a field in the request body. The value will be a
+     * sequence of dot-separated identifiers that identify a protocol buffer
+     * field.
+     *
+     * Consider the following:
+     *
+     *     message CreateContactRequest {
+     *       message EmailAddress {
+     *         enum Type {
+     *           TYPE_UNSPECIFIED = 0;
+     *           HOME = 1;
+     *           WORK = 2;
+     *         }
+     *
+     *         optional string email = 1;
+     *         repeated EmailType type = 2;
+     *       }
+     *
+     *       string full_name = 1;
+     *       repeated EmailAddress email_addresses = 2;
+     *     }
+     *
+     * In this example, in proto `field` could take one of the following values:
+     *
+     * * `full_name` for a violation in the `full_name` value
+     * * `email_addresses[1].email` for a violation in the `email` field of the
+     *   first `email_addresses` message
+     * * `email_addresses[3].type[2]` for a violation in the second `type`
+     *   value in the third `email_addresses` message.
+     *
+     * In JSON, the same values are represented as:
+     *
+     * * `fullName` for a violation in the `fullName` value
+     * * `emailAddresses[1].email` for a violation in the `email` field of the
+     *   first `emailAddresses` message
+     * * `emailAddresses[3].type[2]` for a violation in the second `type`
+     *   value in the third `emailAddresses` message.
+     * 

+     *
+     * string field = 1;
+     * @return The field.
+     */
+    java.lang.String getField();
+    /**
+     * 
+     * A path that leads to a field in the request body. The value will be a
+     * sequence of dot-separated identifiers that identify a protocol buffer
+     * field.
+     *
+     * Consider the following:
+     *
+     *     message CreateContactRequest {
+     *       message EmailAddress {
+     *         enum Type {
+     *           TYPE_UNSPECIFIED = 0;
+     *           HOME = 1;
+     *           WORK = 2;
+     *         }
+     *
+     *         optional string email = 1;
+     *         repeated EmailType type = 2;
+     *       }
+     *
+     *       string full_name = 1;
+     *       repeated EmailAddress email_addresses = 2;
+     *     }
+     *
+     * In this example, in proto `field` could take one of the following values:
+     *
+     * * `full_name` for a violation in the `full_name` value
+     * * `email_addresses[1].email` for a violation in the `email` field of the
+     *   first `email_addresses` message
+     * * `email_addresses[3].type[2]` for a violation in the second `type`
+     *   value in the third `email_addresses` message.
+     *
+     * In JSON, the same values are represented as:
+     *
+     * * `fullName` for a violation in the `fullName` value
+     * * `emailAddresses[1].email` for a violation in the `email` field of the
+     *   first `emailAddresses` message
+     * * `emailAddresses[3].type[2]` for a violation in the second `type`
+     *   value in the third `emailAddresses` message.
+     * 

+     *
+     * string field = 1;
+     * @return The bytes for field.
+     */
+    com.google.protobuf.ByteString
+        getFieldBytes();
+
+    /**
+     * 
+     * A description of why the request element is bad.
+     * 

+     *
+     * string description = 2;
+     * @return The description.
+     */
+    java.lang.String getDescription();
+    /**
+     * 
+     * A description of why the request element is bad.
+     * 

+     *
+     * string description = 2;
+     * @return The bytes for description.
+     */
+    com.google.protobuf.ByteString
+        getDescriptionBytes();
+  }
+  /**
+   * 
+   * A message type used to describe a single bad request field.
+   * 

+   *
+   * Protobuf type {@code rpc.v1.BadRequest.FieldViolation}
+   */
+  public static final class FieldViolation extends
+      com.google.protobuf.GeneratedMessageV3 implements
+      // @@protoc_insertion_point(message_implements:rpc.v1.BadRequest.FieldViolation)
+      FieldViolationOrBuilder {
+  private static final long serialVersionUID = 0L;
+    // Use FieldViolation.newBuilder() to construct.
+    private FieldViolation(com.google.protobuf.GeneratedMessageV3.Builder builder) {
+      super(builder);
+    }
+    private FieldViolation() {
+      field_ = "";
+      description_ = "";
+    }
+
+    @java.lang.Override
+    @SuppressWarnings({"unused"})
+    protected java.lang.Object newInstance(
+        UnusedPrivateParameter unused) {
+      return new FieldViolation();
+    }
+
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_BadRequest_FieldViolation_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_BadRequest_FieldViolation_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation.class, org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation.Builder.class);
+    }
+
+    public static final int FIELD_FIELD_NUMBER = 1;
+    @SuppressWarnings("serial")
+    private volatile java.lang.Object field_ = "";
+    /**
+     * 
+     * A path that leads to a field in the request body. The value will be a
+     * sequence of dot-separated identifiers that identify a protocol buffer
+     * field.
+     *
+     * Consider the following:
+     *
+     *     message CreateContactRequest {
+     *       message EmailAddress {
+     *         enum Type {
+     *           TYPE_UNSPECIFIED = 0;
+     *           HOME = 1;
+     *           WORK = 2;
+     *         }
+     *
+     *         optional string email = 1;
+     *         repeated EmailType type = 2;
+     *       }
+     *
+     *       string full_name = 1;
+     *       repeated EmailAddress email_addresses = 2;
+     *     }
+     *
+     * In this example, in proto `field` could take one of the following values:
+     *
+     * * `full_name` for a violation in the `full_name` value
+     * * `email_addresses[1].email` for a violation in the `email` field of the
+     *   first `email_addresses` message
+     * * `email_addresses[3].type[2]` for a violation in the second `type`
+     *   value in the third `email_addresses` message.
+     *
+     * In JSON, the same values are represented as:
+     *
+     * * `fullName` for a violation in the `fullName` value
+     * * `emailAddresses[1].email` for a violation in the `email` field of the
+     *   first `emailAddresses` message
+     * * `emailAddresses[3].type[2]` for a violation in the second `type`
+     *   value in the third `emailAddresses` message.
+     * 

+     *
+     * string field = 1;
+     * @return The field.
+     */
+    @java.lang.Override
+    public java.lang.String getField() {
+      java.lang.Object ref = field_;
+      if (ref instanceof java.lang.String) {
+        return (java.lang.String) ref;
+      } else {
+        com.google.protobuf.ByteString bs = 
+            (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        field_ = s;
+        return s;
+      }
+    }
+    /**
+     * 
+     * A path that leads to a field in the request body. The value will be a
+     * sequence of dot-separated identifiers that identify a protocol buffer
+     * field.
+     *
+     * Consider the following:
+     *
+     *     message CreateContactRequest {
+     *       message EmailAddress {
+     *         enum Type {
+     *           TYPE_UNSPECIFIED = 0;
+     *           HOME = 1;
+     *           WORK = 2;
+     *         }
+     *
+     *         optional string email = 1;
+     *         repeated EmailType type = 2;
+     *       }
+     *
+     *       string full_name = 1;
+     *       repeated EmailAddress email_addresses = 2;
+     *     }
+     *
+     * In this example, in proto `field` could take one of the following values:
+     *
+     * * `full_name` for a violation in the `full_name` value
+     * * `email_addresses[1].email` for a violation in the `email` field of the
+     *   first `email_addresses` message
+     * * `email_addresses[3].type[2]` for a violation in the second `type`
+     *   value in the third `email_addresses` message.
+     *
+     * In JSON, the same values are represented as:
+     *
+     * * `fullName` for a violation in the `fullName` value
+     * * `emailAddresses[1].email` for a violation in the `email` field of the
+     *   first `emailAddresses` message
+     * * `emailAddresses[3].type[2]` for a violation in the second `type`
+     *   value in the third `emailAddresses` message.
+     * 

+     *
+     * string field = 1;
+     * @return The bytes for field.
+     */
+    @java.lang.Override
+    public com.google.protobuf.ByteString
+        getFieldBytes() {
+      java.lang.Object ref = field_;
+      if (ref instanceof java.lang.String) {
+        com.google.protobuf.ByteString b = 
+            com.google.protobuf.ByteString.copyFromUtf8(
+                (java.lang.String) ref);
+        field_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+
+    public static final int DESCRIPTION_FIELD_NUMBER = 2;
+    @SuppressWarnings("serial")
+    private volatile java.lang.Object description_ = "";
+    /**
+     * 
+     * A description of why the request element is bad.
+     * 

+     *
+     * string description = 2;
+     * @return The description.
+     */
+    @java.lang.Override
+    public java.lang.String getDescription() {
+      java.lang.Object ref = description_;
+      if (ref instanceof java.lang.String) {
+        return (java.lang.String) ref;
+      } else {
+        com.google.protobuf.ByteString bs = 
+            (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        description_ = s;
+        return s;
+      }
+    }
+    /**
+     * 
+     * A description of why the request element is bad.
+     * 

+     *
+     * string description = 2;
+     * @return The bytes for description.
+     */
+    @java.lang.Override
+    public com.google.protobuf.ByteString
+        getDescriptionBytes() {
+      java.lang.Object ref = description_;
+      if (ref instanceof java.lang.String) {
+        com.google.protobuf.ByteString b = 
+            com.google.protobuf.ByteString.copyFromUtf8(
+                (java.lang.String) ref);
+        description_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+
+    private byte memoizedIsInitialized = -1;
+    @java.lang.Override
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized == 1) return true;
+      if (isInitialized == 0) return false;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    @java.lang.Override
+    public void writeTo(com.google.protobuf.CodedOutputStream output)
+                        throws java.io.IOException {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(field_)) {
+        com.google.protobuf.GeneratedMessageV3.writeString(output, 1, field_);
+      }
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
+        com.google.protobuf.GeneratedMessageV3.writeString(output, 2, description_);
+      }
+      getUnknownFields().writeTo(output);
+    }
+
+    @java.lang.Override
+    public int getSerializedSize() {
+      int size = memoizedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(field_)) {
+        size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, field_);
+      }
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
+        size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, description_);
+      }
+      size += getUnknownFields().getSerializedSize();
+      memoizedSize = size;
+      return size;
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+       return true;
+      }
+      if (!(obj instanceof org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation)) {
+        return super.equals(obj);
+      }
+      org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation other = (org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation) obj;
+
+      if (!getField()
+          .equals(other.getField())) return false;
+      if (!getDescription()
+          .equals(other.getDescription())) return false;
+      if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+      return true;
+    }
+
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      hash = (37 * hash) + FIELD_FIELD_NUMBER;
+      hash = (53 * hash) + getField().hashCode();
+      hash = (37 * hash) + DESCRIPTION_FIELD_NUMBER;
+      hash = (53 * hash) + getDescription().hashCode();
+      hash = (29 * hash) + getUnknownFields().hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation parseFrom(
+        java.nio.ByteBuffer data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation parseFrom(
+        java.nio.ByteBuffer data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation parseFrom(byte[] data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation parseFrom(
+        byte[] data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation parseFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input);
+    }
+    public static org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation parseFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input, extensionRegistry);
+    }
+
+    public static org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation parseDelimitedFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseDelimitedWithIOException(PARSER, input);
+    }
+
+    public static org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation parseDelimitedFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation parseFrom(
+        com.google.protobuf.CodedInputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input);
+    }
+    public static org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() { return newBuilder(); }
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+    public static Builder newBuilder(org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE
+          ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+    /**
+     * 
+     * A message type used to describe a single bad request field.
+     * 

+     *
+     * Protobuf type {@code rpc.v1.BadRequest.FieldViolation}
+     */
+    public static final class Builder extends
+        com.google.protobuf.GeneratedMessageV3.Builder implements
+        // @@protoc_insertion_point(builder_implements:rpc.v1.BadRequest.FieldViolation)
+        org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolationOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor
+          getDescriptor() {
+        return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_BadRequest_FieldViolation_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_BadRequest_FieldViolation_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation.class, org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation.Builder.class);
+      }
+
+      // Construct using org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation.newBuilder()
+      private Builder() {
+
+      }
+
+      private Builder(
+          com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+        super(parent);
+
+      }
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        bitField0_ = 0;
+        field_ = "";
+        description_ = "";
+        return this;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor
+          getDescriptorForType() {
+        return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_BadRequest_FieldViolation_descriptor;
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation getDefaultInstanceForType() {
+        return org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation.getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation build() {
+        org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation buildPartial() {
+        org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation result = new org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation(this);
+        if (bitField0_ != 0) { buildPartial0(result); }
+        onBuilt();
+        return result;
+      }
+
+      private void buildPartial0(org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation result) {
+        int from_bitField0_ = bitField0_;
+        if (((from_bitField0_ & 0x00000001) != 0)) {
+          result.field_ = field_;
+        }
+        if (((from_bitField0_ & 0x00000002) != 0)) {
+          result.description_ = description_;
+        }
+      }
+
+      @java.lang.Override
+      public Builder clone() {
+        return super.clone();
+      }
+      @java.lang.Override
+      public Builder setField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          java.lang.Object value) {
+        return super.setField(field, value);
+      }
+      @java.lang.Override
+      public Builder clearField(
+          com.google.protobuf.Descriptors.FieldDescriptor field) {
+        return super.clearField(field);
+      }
+      @java.lang.Override
+      public Builder clearOneof(
+          com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+        return super.clearOneof(oneof);
+      }
+      @java.lang.Override
+      public Builder setRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          int index, java.lang.Object value) {
+        return super.setRepeatedField(field, index, value);
+      }
+      @java.lang.Override
+      public Builder addRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          java.lang.Object value) {
+        return super.addRepeatedField(field, value);
+      }
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation) {
+          return mergeFrom((org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation)other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation other) {
+        if (other == org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation.getDefaultInstance()) return this;
+        if (!other.getField().isEmpty()) {
+          field_ = other.field_;
+          bitField0_ |= 0x00000001;
+          onChanged();
+        }
+        if (!other.getDescription().isEmpty()) {
+          description_ = other.description_;
+          bitField0_ |= 0x00000002;
+          onChanged();
+        }
+        this.mergeUnknownFields(other.getUnknownFields());
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        if (extensionRegistry == null) {
+          throw new java.lang.NullPointerException();
+        }
+        try {
+          boolean done = false;
+          while (!done) {
+            int tag = input.readTag();
+            switch (tag) {
+              case 0:
+                done = true;
+                break;
+              case 10: {
+                field_ = input.readStringRequireUtf8();
+                bitField0_ |= 0x00000001;
+                break;
+              } // case 10
+              case 18: {
+                description_ = input.readStringRequireUtf8();
+                bitField0_ |= 0x00000002;
+                break;
+              } // case 18
+              default: {
+                if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                  done = true; // was an endgroup tag
+                }
+                break;
+              } // default:
+            } // switch (tag)
+          } // while (!done)
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          throw e.unwrapIOException();
+        } finally {
+          onChanged();
+        } // finally
+        return this;
+      }
+      private int bitField0_;
+
+      private java.lang.Object field_ = "";
+      /**
+       * 
+       * A path that leads to a field in the request body. The value will be a
+       * sequence of dot-separated identifiers that identify a protocol buffer
+       * field.
+       *
+       * Consider the following:
+       *
+       *     message CreateContactRequest {
+       *       message EmailAddress {
+       *         enum Type {
+       *           TYPE_UNSPECIFIED = 0;
+       *           HOME = 1;
+       *           WORK = 2;
+       *         }
+       *
+       *         optional string email = 1;
+       *         repeated EmailType type = 2;
+       *       }
+       *
+       *       string full_name = 1;
+       *       repeated EmailAddress email_addresses = 2;
+       *     }
+       *
+       * In this example, in proto `field` could take one of the following values:
+       *
+       * * `full_name` for a violation in the `full_name` value
+       * * `email_addresses[1].email` for a violation in the `email` field of the
+       *   first `email_addresses` message
+       * * `email_addresses[3].type[2]` for a violation in the second `type`
+       *   value in the third `email_addresses` message.
+       *
+       * In JSON, the same values are represented as:
+       *
+       * * `fullName` for a violation in the `fullName` value
+       * * `emailAddresses[1].email` for a violation in the `email` field of the
+       *   first `emailAddresses` message
+       * * `emailAddresses[3].type[2]` for a violation in the second `type`
+       *   value in the third `emailAddresses` message.
+       * 

+       *
+       * string field = 1;
+       * @return The field.
+       */
+      public java.lang.String getField() {
+        java.lang.Object ref = field_;
+        if (!(ref instanceof java.lang.String)) {
+          com.google.protobuf.ByteString bs =
+              (com.google.protobuf.ByteString) ref;
+          java.lang.String s = bs.toStringUtf8();
+          field_ = s;
+          return s;
+        } else {
+          return (java.lang.String) ref;
+        }
+      }
+      /**
+       * 
+       * A path that leads to a field in the request body. The value will be a
+       * sequence of dot-separated identifiers that identify a protocol buffer
+       * field.
+       *
+       * Consider the following:
+       *
+       *     message CreateContactRequest {
+       *       message EmailAddress {
+       *         enum Type {
+       *           TYPE_UNSPECIFIED = 0;
+       *           HOME = 1;
+       *           WORK = 2;
+       *         }
+       *
+       *         optional string email = 1;
+       *         repeated EmailType type = 2;
+       *       }
+       *
+       *       string full_name = 1;
+       *       repeated EmailAddress email_addresses = 2;
+       *     }
+       *
+       * In this example, in proto `field` could take one of the following values:
+       *
+       * * `full_name` for a violation in the `full_name` value
+       * * `email_addresses[1].email` for a violation in the `email` field of the
+       *   first `email_addresses` message
+       * * `email_addresses[3].type[2]` for a violation in the second `type`
+       *   value in the third `email_addresses` message.
+       *
+       * In JSON, the same values are represented as:
+       *
+       * * `fullName` for a violation in the `fullName` value
+       * * `emailAddresses[1].email` for a violation in the `email` field of the
+       *   first `emailAddresses` message
+       * * `emailAddresses[3].type[2]` for a violation in the second `type`
+       *   value in the third `emailAddresses` message.
+       * 

+       *
+       * string field = 1;
+       * @return The bytes for field.
+       */
+      public com.google.protobuf.ByteString
+          getFieldBytes() {
+        java.lang.Object ref = field_;
+        if (ref instanceof String) {
+          com.google.protobuf.ByteString b = 
+              com.google.protobuf.ByteString.copyFromUtf8(
+                  (java.lang.String) ref);
+          field_ = b;
+          return b;
+        } else {
+          return (com.google.protobuf.ByteString) ref;
+        }
+      }
+      /**
+       * 
+       * A path that leads to a field in the request body. The value will be a
+       * sequence of dot-separated identifiers that identify a protocol buffer
+       * field.
+       *
+       * Consider the following:
+       *
+       *     message CreateContactRequest {
+       *       message EmailAddress {
+       *         enum Type {
+       *           TYPE_UNSPECIFIED = 0;
+       *           HOME = 1;
+       *           WORK = 2;
+       *         }
+       *
+       *         optional string email = 1;
+       *         repeated EmailType type = 2;
+       *       }
+       *
+       *       string full_name = 1;
+       *       repeated EmailAddress email_addresses = 2;
+       *     }
+       *
+       * In this example, in proto `field` could take one of the following values:
+       *
+       * * `full_name` for a violation in the `full_name` value
+       * * `email_addresses[1].email` for a violation in the `email` field of the
+       *   first `email_addresses` message
+       * * `email_addresses[3].type[2]` for a violation in the second `type`
+       *   value in the third `email_addresses` message.
+       *
+       * In JSON, the same values are represented as:
+       *
+       * * `fullName` for a violation in the `fullName` value
+       * * `emailAddresses[1].email` for a violation in the `email` field of the
+       *   first `emailAddresses` message
+       * * `emailAddresses[3].type[2]` for a violation in the second `type`
+       *   value in the third `emailAddresses` message.
+       * 

+       *
+       * string field = 1;
+       * @param value The field to set.
+       * @return This builder for chaining.
+       */
+      public Builder setField(
+          java.lang.String value) {
+        if (value == null) { throw new NullPointerException(); }
+        field_ = value;
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+      /**
+       * 
+       * A path that leads to a field in the request body. The value will be a
+       * sequence of dot-separated identifiers that identify a protocol buffer
+       * field.
+       *
+       * Consider the following:
+       *
+       *     message CreateContactRequest {
+       *       message EmailAddress {
+       *         enum Type {
+       *           TYPE_UNSPECIFIED = 0;
+       *           HOME = 1;
+       *           WORK = 2;
+       *         }
+       *
+       *         optional string email = 1;
+       *         repeated EmailType type = 2;
+       *       }
+       *
+       *       string full_name = 1;
+       *       repeated EmailAddress email_addresses = 2;
+       *     }
+       *
+       * In this example, in proto `field` could take one of the following values:
+       *
+       * * `full_name` for a violation in the `full_name` value
+       * * `email_addresses[1].email` for a violation in the `email` field of the
+       *   first `email_addresses` message
+       * * `email_addresses[3].type[2]` for a violation in the second `type`
+       *   value in the third `email_addresses` message.
+       *
+       * In JSON, the same values are represented as:
+       *
+       * * `fullName` for a violation in the `fullName` value
+       * * `emailAddresses[1].email` for a violation in the `email` field of the
+       *   first `emailAddresses` message
+       * * `emailAddresses[3].type[2]` for a violation in the second `type`
+       *   value in the third `emailAddresses` message.
+       * 

+       *
+       * string field = 1;
+       * @return This builder for chaining.
+       */
+      public Builder clearField() {
+        field_ = getDefaultInstance().getField();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        onChanged();
+        return this;
+      }
+      /**
+       * 
+       * A path that leads to a field in the request body. The value will be a
+       * sequence of dot-separated identifiers that identify a protocol buffer
+       * field.
+       *
+       * Consider the following:
+       *
+       *     message CreateContactRequest {
+       *       message EmailAddress {
+       *         enum Type {
+       *           TYPE_UNSPECIFIED = 0;
+       *           HOME = 1;
+       *           WORK = 2;
+       *         }
+       *
+       *         optional string email = 1;
+       *         repeated EmailType type = 2;
+       *       }
+       *
+       *       string full_name = 1;
+       *       repeated EmailAddress email_addresses = 2;
+       *     }
+       *
+       * In this example, in proto `field` could take one of the following values:
+       *
+       * * `full_name` for a violation in the `full_name` value
+       * * `email_addresses[1].email` for a violation in the `email` field of the
+       *   first `email_addresses` message
+       * * `email_addresses[3].type[2]` for a violation in the second `type`
+       *   value in the third `email_addresses` message.
+       *
+       * In JSON, the same values are represented as:
+       *
+       * * `fullName` for a violation in the `fullName` value
+       * * `emailAddresses[1].email` for a violation in the `email` field of the
+       *   first `emailAddresses` message
+       * * `emailAddresses[3].type[2]` for a violation in the second `type`
+       *   value in the third `emailAddresses` message.
+       * 

+       *
+       * string field = 1;
+       * @param value The bytes for field to set.
+       * @return This builder for chaining.
+       */
+      public Builder setFieldBytes(
+          com.google.protobuf.ByteString value) {
+        if (value == null) { throw new NullPointerException(); }
+        checkByteStringIsUtf8(value);
+        field_ = value;
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+
+      private java.lang.Object description_ = "";
+      /**
+       * 
+       * A description of why the request element is bad.
+       * 

+       *
+       * string description = 2;
+       * @return The description.
+       */
+      public java.lang.String getDescription() {
+        java.lang.Object ref = description_;
+        if (!(ref instanceof java.lang.String)) {
+          com.google.protobuf.ByteString bs =
+              (com.google.protobuf.ByteString) ref;
+          java.lang.String s = bs.toStringUtf8();
+          description_ = s;
+          return s;
+        } else {
+          return (java.lang.String) ref;
+        }
+      }
+      /**
+       * 
+       * A description of why the request element is bad.
+       * 

+       *
+       * string description = 2;
+       * @return The bytes for description.
+       */
+      public com.google.protobuf.ByteString
+          getDescriptionBytes() {
+        java.lang.Object ref = description_;
+        if (ref instanceof String) {
+          com.google.protobuf.ByteString b = 
+              com.google.protobuf.ByteString.copyFromUtf8(
+                  (java.lang.String) ref);
+          description_ = b;
+          return b;
+        } else {
+          return (com.google.protobuf.ByteString) ref;
+        }
+      }
+      /**
+       * 
+       * A description of why the request element is bad.
+       * 

+       *
+       * string description = 2;
+       * @param value The description to set.
+       * @return This builder for chaining.
+       */
+      public Builder setDescription(
+          java.lang.String value) {
+        if (value == null) { throw new NullPointerException(); }
+        description_ = value;
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return this;
+      }
+      /**
+       * 
+       * A description of why the request element is bad.
+       * 

+       *
+       * string description = 2;
+       * @return This builder for chaining.
+       */
+      public Builder clearDescription() {
+        description_ = getDefaultInstance().getDescription();
+        bitField0_ = (bitField0_ & ~0x00000002);
+        onChanged();
+        return this;
+      }
+      /**
+       * 
+       * A description of why the request element is bad.
+       * 

+       *
+       * string description = 2;
+       * @param value The bytes for description to set.
+       * @return This builder for chaining.
+       */
+      public Builder setDescriptionBytes(
+          com.google.protobuf.ByteString value) {
+        if (value == null) { throw new NullPointerException(); }
+        checkByteStringIsUtf8(value);
+        description_ = value;
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return this;
+      }
+      @java.lang.Override
+      public final Builder setUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.setUnknownFields(unknownFields);
+      }
+
+      @java.lang.Override
+      public final Builder mergeUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.mergeUnknownFields(unknownFields);
+      }
+
+
+      // @@protoc_insertion_point(builder_scope:rpc.v1.BadRequest.FieldViolation)
+    }
+
+    // @@protoc_insertion_point(class_scope:rpc.v1.BadRequest.FieldViolation)
+    private static final org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation DEFAULT_INSTANCE;
+    static {
+      DEFAULT_INSTANCE = new org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation();
+    }
+
+    public static org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser
+        PARSER = new com.google.protobuf.AbstractParser() {
+      @java.lang.Override
+      public FieldViolation parsePartialFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        Builder builder = newBuilder();
+        try {
+          builder.mergeFrom(input, extensionRegistry);
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          throw e.setUnfinishedMessage(builder.buildPartial());
+        } catch (com.google.protobuf.UninitializedMessageException e) {
+          throw e.asInvalidProtocolBufferException().setUnfinishedMessage(builder.buildPartial());
+        } catch (java.io.IOException e) {
+          throw new com.google.protobuf.InvalidProtocolBufferException(e)
+              .setUnfinishedMessage(builder.buildPartial());
+        }
+        return builder.buildPartial();
+      }
+    };
+
+    public static com.google.protobuf.Parser parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+
+  }
+
+  public static final int FIELD_VIOLATIONS_FIELD_NUMBER = 1;
+  @SuppressWarnings("serial")
+  private java.util.List fieldViolations_;
+  /**
+   * 
+   * Describes all violations in a client request.
+   * 

+   *
+   * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+   */
+  @java.lang.Override
+  public java.util.List getFieldViolationsList() {
+    return fieldViolations_;
+  }
+  /**
+   * 
+   * Describes all violations in a client request.
+   * 

+   *
+   * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+   */
+  @java.lang.Override
+  public java.util.List 
+      getFieldViolationsOrBuilderList() {
+    return fieldViolations_;
+  }
+  /**
+   * 
+   * Describes all violations in a client request.
+   * 

+   *
+   * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+   */
+  @java.lang.Override
+  public int getFieldViolationsCount() {
+    return fieldViolations_.size();
+  }
+  /**
+   * 
+   * Describes all violations in a client request.
+   * 

+   *
+   * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+   */
+  @java.lang.Override
+  public org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation getFieldViolations(int index) {
+    return fieldViolations_.get(index);
+  }
+  /**
+   * 
+   * Describes all violations in a client request.
+   * 

+   *
+   * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+   */
+  @java.lang.Override
+  public org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolationOrBuilder getFieldViolationsOrBuilder(
+      int index) {
+    return fieldViolations_.get(index);
+  }
+
+  private byte memoizedIsInitialized = -1;
+  @java.lang.Override
+  public final boolean isInitialized() {
+    byte isInitialized = memoizedIsInitialized;
+    if (isInitialized == 1) return true;
+    if (isInitialized == 0) return false;
+
+    memoizedIsInitialized = 1;
+    return true;
+  }
+
+  @java.lang.Override
+  public void writeTo(com.google.protobuf.CodedOutputStream output)
+                      throws java.io.IOException {
+    for (int i = 0; i < fieldViolations_.size(); i++) {
+      output.writeMessage(1, fieldViolations_.get(i));
+    }
+    getUnknownFields().writeTo(output);
+  }
+
+  @java.lang.Override
+  public int getSerializedSize() {
+    int size = memoizedSize;
+    if (size != -1) return size;
+
+    size = 0;
+    for (int i = 0; i < fieldViolations_.size(); i++) {
+      size += com.google.protobuf.CodedOutputStream
+        .computeMessageSize(1, fieldViolations_.get(i));
+    }
+    size += getUnknownFields().getSerializedSize();
+    memoizedSize = size;
+    return size;
+  }
+
+  @java.lang.Override
+  public boolean equals(final java.lang.Object obj) {
+    if (obj == this) {
+     return true;
+    }
+    if (!(obj instanceof org.vdaas.vald.api.v1.rpc.BadRequest)) {
+      return super.equals(obj);
+    }
+    org.vdaas.vald.api.v1.rpc.BadRequest other = (org.vdaas.vald.api.v1.rpc.BadRequest) obj;
+
+    if (!getFieldViolationsList()
+        .equals(other.getFieldViolationsList())) return false;
+    if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+    return true;
+  }
+
+  @java.lang.Override
+  public int hashCode() {
+    if (memoizedHashCode != 0) {
+      return memoizedHashCode;
+    }
+    int hash = 41;
+    hash = (19 * hash) + getDescriptor().hashCode();
+    if (getFieldViolationsCount() > 0) {
+      hash = (37 * hash) + FIELD_VIOLATIONS_FIELD_NUMBER;
+      hash = (53 * hash) + getFieldViolationsList().hashCode();
+    }
+    hash = (29 * hash) + getUnknownFields().hashCode();
+    memoizedHashCode = hash;
+    return hash;
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.BadRequest parseFrom(
+      java.nio.ByteBuffer data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.BadRequest parseFrom(
+      java.nio.ByteBuffer data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.BadRequest parseFrom(
+      com.google.protobuf.ByteString data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.BadRequest parseFrom(
+      com.google.protobuf.ByteString data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.BadRequest parseFrom(byte[] data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.BadRequest parseFrom(
+      byte[] data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.BadRequest parseFrom(java.io.InputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input);
+  }
+  public static org.vdaas.vald.api.v1.rpc.BadRequest parseFrom(
+      java.io.InputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input, extensionRegistry);
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.BadRequest parseDelimitedFrom(java.io.InputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseDelimitedWithIOException(PARSER, input);
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.BadRequest parseDelimitedFrom(
+      java.io.InputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.BadRequest parseFrom(
+      com.google.protobuf.CodedInputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input);
+  }
+  public static org.vdaas.vald.api.v1.rpc.BadRequest parseFrom(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input, extensionRegistry);
+  }
+
+  @java.lang.Override
+  public Builder newBuilderForType() { return newBuilder(); }
+  public static Builder newBuilder() {
+    return DEFAULT_INSTANCE.toBuilder();
+  }
+  public static Builder newBuilder(org.vdaas.vald.api.v1.rpc.BadRequest prototype) {
+    return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+  }
+  @java.lang.Override
+  public Builder toBuilder() {
+    return this == DEFAULT_INSTANCE
+        ? new Builder() : new Builder().mergeFrom(this);
+  }
+
+  @java.lang.Override
+  protected Builder newBuilderForType(
+      com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+    Builder builder = new Builder(parent);
+    return builder;
+  }
+  /**
+   * 
+   * Describes violations in a client request. This error type focuses on the
+   * syntactic aspects of the request.
+   * 

+   *
+   * Protobuf type {@code rpc.v1.BadRequest}
+   */
+  public static final class Builder extends
+      com.google.protobuf.GeneratedMessageV3.Builder implements
+      // @@protoc_insertion_point(builder_implements:rpc.v1.BadRequest)
+      org.vdaas.vald.api.v1.rpc.BadRequestOrBuilder {
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_BadRequest_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_BadRequest_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              org.vdaas.vald.api.v1.rpc.BadRequest.class, org.vdaas.vald.api.v1.rpc.BadRequest.Builder.class);
+    }
+
+    // Construct using org.vdaas.vald.api.v1.rpc.BadRequest.newBuilder()
+    private Builder() {
+
+    }
+
+    private Builder(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      super(parent);
+
+    }
+    @java.lang.Override
+    public Builder clear() {
+      super.clear();
+      bitField0_ = 0;
+      if (fieldViolationsBuilder_ == null) {
+        fieldViolations_ = java.util.Collections.emptyList();
+      } else {
+        fieldViolations_ = null;
+        fieldViolationsBuilder_.clear();
+      }
+      bitField0_ = (bitField0_ & ~0x00000001);
+      return this;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.Descriptor
+        getDescriptorForType() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_BadRequest_descriptor;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.BadRequest getDefaultInstanceForType() {
+      return org.vdaas.vald.api.v1.rpc.BadRequest.getDefaultInstance();
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.BadRequest build() {
+      org.vdaas.vald.api.v1.rpc.BadRequest result = buildPartial();
+      if (!result.isInitialized()) {
+        throw newUninitializedMessageException(result);
+      }
+      return result;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.BadRequest buildPartial() {
+      org.vdaas.vald.api.v1.rpc.BadRequest result = new org.vdaas.vald.api.v1.rpc.BadRequest(this);
+      buildPartialRepeatedFields(result);
+      if (bitField0_ != 0) { buildPartial0(result); }
+      onBuilt();
+      return result;
+    }
+
+    private void buildPartialRepeatedFields(org.vdaas.vald.api.v1.rpc.BadRequest result) {
+      if (fieldViolationsBuilder_ == null) {
+        if (((bitField0_ & 0x00000001) != 0)) {
+          fieldViolations_ = java.util.Collections.unmodifiableList(fieldViolations_);
+          bitField0_ = (bitField0_ & ~0x00000001);
+        }
+        result.fieldViolations_ = fieldViolations_;
+      } else {
+        result.fieldViolations_ = fieldViolationsBuilder_.build();
+      }
+    }
+
+    private void buildPartial0(org.vdaas.vald.api.v1.rpc.BadRequest result) {
+      int from_bitField0_ = bitField0_;
+    }
+
+    @java.lang.Override
+    public Builder clone() {
+      return super.clone();
+    }
+    @java.lang.Override
+    public Builder setField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        java.lang.Object value) {
+      return super.setField(field, value);
+    }
+    @java.lang.Override
+    public Builder clearField(
+        com.google.protobuf.Descriptors.FieldDescriptor field) {
+      return super.clearField(field);
+    }
+    @java.lang.Override
+    public Builder clearOneof(
+        com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+      return super.clearOneof(oneof);
+    }
+    @java.lang.Override
+    public Builder setRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        int index, java.lang.Object value) {
+      return super.setRepeatedField(field, index, value);
+    }
+    @java.lang.Override
+    public Builder addRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        java.lang.Object value) {
+      return super.addRepeatedField(field, value);
+    }
+    @java.lang.Override
+    public Builder mergeFrom(com.google.protobuf.Message other) {
+      if (other instanceof org.vdaas.vald.api.v1.rpc.BadRequest) {
+        return mergeFrom((org.vdaas.vald.api.v1.rpc.BadRequest)other);
+      } else {
+        super.mergeFrom(other);
+        return this;
+      }
+    }
+
+    public Builder mergeFrom(org.vdaas.vald.api.v1.rpc.BadRequest other) {
+      if (other == org.vdaas.vald.api.v1.rpc.BadRequest.getDefaultInstance()) return this;
+      if (fieldViolationsBuilder_ == null) {
+        if (!other.fieldViolations_.isEmpty()) {
+          if (fieldViolations_.isEmpty()) {
+            fieldViolations_ = other.fieldViolations_;
+            bitField0_ = (bitField0_ & ~0x00000001);
+          } else {
+            ensureFieldViolationsIsMutable();
+            fieldViolations_.addAll(other.fieldViolations_);
+          }
+          onChanged();
+        }
+      } else {
+        if (!other.fieldViolations_.isEmpty()) {
+          if (fieldViolationsBuilder_.isEmpty()) {
+            fieldViolationsBuilder_.dispose();
+            fieldViolationsBuilder_ = null;
+            fieldViolations_ = other.fieldViolations_;
+            bitField0_ = (bitField0_ & ~0x00000001);
+            fieldViolationsBuilder_ = 
+              com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders ?
+                 getFieldViolationsFieldBuilder() : null;
+          } else {
+            fieldViolationsBuilder_.addAllMessages(other.fieldViolations_);
+          }
+        }
+      }
+      this.mergeUnknownFields(other.getUnknownFields());
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      return true;
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      if (extensionRegistry == null) {
+        throw new java.lang.NullPointerException();
+      }
+      try {
+        boolean done = false;
+        while (!done) {
+          int tag = input.readTag();
+          switch (tag) {
+            case 0:
+              done = true;
+              break;
+            case 10: {
+              org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation m =
+                  input.readMessage(
+                      org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation.parser(),
+                      extensionRegistry);
+              if (fieldViolationsBuilder_ == null) {
+                ensureFieldViolationsIsMutable();
+                fieldViolations_.add(m);
+              } else {
+                fieldViolationsBuilder_.addMessage(m);
+              }
+              break;
+            } // case 10
+            default: {
+              if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                done = true; // was an endgroup tag
+              }
+              break;
+            } // default:
+          } // switch (tag)
+        } // while (!done)
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.unwrapIOException();
+      } finally {
+        onChanged();
+      } // finally
+      return this;
+    }
+    private int bitField0_;
+
+    private java.util.List fieldViolations_ =
+      java.util.Collections.emptyList();
+    private void ensureFieldViolationsIsMutable() {
+      if (!((bitField0_ & 0x00000001) != 0)) {
+        fieldViolations_ = new java.util.ArrayList(fieldViolations_);
+        bitField0_ |= 0x00000001;
+       }
+    }
+
+    private com.google.protobuf.RepeatedFieldBuilderV3<
+        org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation, org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation.Builder, org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolationOrBuilder> fieldViolationsBuilder_;
+
+    /**
+     * 
+     * Describes all violations in a client request.
+     * 

+     *
+     * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+     */
+    public java.util.List getFieldViolationsList() {
+      if (fieldViolationsBuilder_ == null) {
+        return java.util.Collections.unmodifiableList(fieldViolations_);
+      } else {
+        return fieldViolationsBuilder_.getMessageList();
+      }
+    }
+    /**
+     * 
+     * Describes all violations in a client request.
+     * 

+     *
+     * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+     */
+    public int getFieldViolationsCount() {
+      if (fieldViolationsBuilder_ == null) {
+        return fieldViolations_.size();
+      } else {
+        return fieldViolationsBuilder_.getCount();
+      }
+    }
+    /**
+     * 
+     * Describes all violations in a client request.
+     * 

+     *
+     * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+     */
+    public org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation getFieldViolations(int index) {
+      if (fieldViolationsBuilder_ == null) {
+        return fieldViolations_.get(index);
+      } else {
+        return fieldViolationsBuilder_.getMessage(index);
+      }
+    }
+    /**
+     * 
+     * Describes all violations in a client request.
+     * 

+     *
+     * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+     */
+    public Builder setFieldViolations(
+        int index, org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation value) {
+      if (fieldViolationsBuilder_ == null) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        ensureFieldViolationsIsMutable();
+        fieldViolations_.set(index, value);
+        onChanged();
+      } else {
+        fieldViolationsBuilder_.setMessage(index, value);
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all violations in a client request.
+     * 

+     *
+     * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+     */
+    public Builder setFieldViolations(
+        int index, org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation.Builder builderForValue) {
+      if (fieldViolationsBuilder_ == null) {
+        ensureFieldViolationsIsMutable();
+        fieldViolations_.set(index, builderForValue.build());
+        onChanged();
+      } else {
+        fieldViolationsBuilder_.setMessage(index, builderForValue.build());
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all violations in a client request.
+     * 

+     *
+     * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+     */
+    public Builder addFieldViolations(org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation value) {
+      if (fieldViolationsBuilder_ == null) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        ensureFieldViolationsIsMutable();
+        fieldViolations_.add(value);
+        onChanged();
+      } else {
+        fieldViolationsBuilder_.addMessage(value);
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all violations in a client request.
+     * 

+     *
+     * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+     */
+    public Builder addFieldViolations(
+        int index, org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation value) {
+      if (fieldViolationsBuilder_ == null) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        ensureFieldViolationsIsMutable();
+        fieldViolations_.add(index, value);
+        onChanged();
+      } else {
+        fieldViolationsBuilder_.addMessage(index, value);
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all violations in a client request.
+     * 

+     *
+     * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+     */
+    public Builder addFieldViolations(
+        org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation.Builder builderForValue) {
+      if (fieldViolationsBuilder_ == null) {
+        ensureFieldViolationsIsMutable();
+        fieldViolations_.add(builderForValue.build());
+        onChanged();
+      } else {
+        fieldViolationsBuilder_.addMessage(builderForValue.build());
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all violations in a client request.
+     * 

+     *
+     * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+     */
+    public Builder addFieldViolations(
+        int index, org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation.Builder builderForValue) {
+      if (fieldViolationsBuilder_ == null) {
+        ensureFieldViolationsIsMutable();
+        fieldViolations_.add(index, builderForValue.build());
+        onChanged();
+      } else {
+        fieldViolationsBuilder_.addMessage(index, builderForValue.build());
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all violations in a client request.
+     * 

+     *
+     * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+     */
+    public Builder addAllFieldViolations(
+        java.lang.Iterable values) {
+      if (fieldViolationsBuilder_ == null) {
+        ensureFieldViolationsIsMutable();
+        com.google.protobuf.AbstractMessageLite.Builder.addAll(
+            values, fieldViolations_);
+        onChanged();
+      } else {
+        fieldViolationsBuilder_.addAllMessages(values);
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all violations in a client request.
+     * 

+     *
+     * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+     */
+    public Builder clearFieldViolations() {
+      if (fieldViolationsBuilder_ == null) {
+        fieldViolations_ = java.util.Collections.emptyList();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        onChanged();
+      } else {
+        fieldViolationsBuilder_.clear();
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all violations in a client request.
+     * 

+     *
+     * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+     */
+    public Builder removeFieldViolations(int index) {
+      if (fieldViolationsBuilder_ == null) {
+        ensureFieldViolationsIsMutable();
+        fieldViolations_.remove(index);
+        onChanged();
+      } else {
+        fieldViolationsBuilder_.remove(index);
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all violations in a client request.
+     * 

+     *
+     * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+     */
+    public org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation.Builder getFieldViolationsBuilder(
+        int index) {
+      return getFieldViolationsFieldBuilder().getBuilder(index);
+    }
+    /**
+     * 
+     * Describes all violations in a client request.
+     * 

+     *
+     * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+     */
+    public org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolationOrBuilder getFieldViolationsOrBuilder(
+        int index) {
+      if (fieldViolationsBuilder_ == null) {
+        return fieldViolations_.get(index);  } else {
+        return fieldViolationsBuilder_.getMessageOrBuilder(index);
+      }
+    }
+    /**
+     * 
+     * Describes all violations in a client request.
+     * 

+     *
+     * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+     */
+    public java.util.List 
+         getFieldViolationsOrBuilderList() {
+      if (fieldViolationsBuilder_ != null) {
+        return fieldViolationsBuilder_.getMessageOrBuilderList();
+      } else {
+        return java.util.Collections.unmodifiableList(fieldViolations_);
+      }
+    }
+    /**
+     * 
+     * Describes all violations in a client request.
+     * 

+     *
+     * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+     */
+    public org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation.Builder addFieldViolationsBuilder() {
+      return getFieldViolationsFieldBuilder().addBuilder(
+          org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation.getDefaultInstance());
+    }
+    /**
+     * 
+     * Describes all violations in a client request.
+     * 

+     *
+     * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+     */
+    public org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation.Builder addFieldViolationsBuilder(
+        int index) {
+      return getFieldViolationsFieldBuilder().addBuilder(
+          index, org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation.getDefaultInstance());
+    }
+    /**
+     * 
+     * Describes all violations in a client request.
+     * 

+     *
+     * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+     */
+    public java.util.List 
+         getFieldViolationsBuilderList() {
+      return getFieldViolationsFieldBuilder().getBuilderList();
+    }
+    private com.google.protobuf.RepeatedFieldBuilderV3<
+        org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation, org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation.Builder, org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolationOrBuilder> 
+        getFieldViolationsFieldBuilder() {
+      if (fieldViolationsBuilder_ == null) {
+        fieldViolationsBuilder_ = new com.google.protobuf.RepeatedFieldBuilderV3<
+            org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation, org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation.Builder, org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolationOrBuilder>(
+                fieldViolations_,
+                ((bitField0_ & 0x00000001) != 0),
+                getParentForChildren(),
+                isClean());
+        fieldViolations_ = null;
+      }
+      return fieldViolationsBuilder_;
+    }
+    @java.lang.Override
+    public final Builder setUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.setUnknownFields(unknownFields);
+    }
+
+    @java.lang.Override
+    public final Builder mergeUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.mergeUnknownFields(unknownFields);
+    }
+
+
+    // @@protoc_insertion_point(builder_scope:rpc.v1.BadRequest)
+  }
+
+  // @@protoc_insertion_point(class_scope:rpc.v1.BadRequest)
+  private static final org.vdaas.vald.api.v1.rpc.BadRequest DEFAULT_INSTANCE;
+  static {
+    DEFAULT_INSTANCE = new org.vdaas.vald.api.v1.rpc.BadRequest();
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.BadRequest getDefaultInstance() {
+    return DEFAULT_INSTANCE;
+  }
+
+  private static final com.google.protobuf.Parser
+      PARSER = new com.google.protobuf.AbstractParser() {
+    @java.lang.Override
+    public BadRequest parsePartialFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      Builder builder = newBuilder();
+      try {
+        builder.mergeFrom(input, extensionRegistry);
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(builder.buildPartial());
+      } catch (com.google.protobuf.UninitializedMessageException e) {
+        throw e.asInvalidProtocolBufferException().setUnfinishedMessage(builder.buildPartial());
+      } catch (java.io.IOException e) {
+        throw new com.google.protobuf.InvalidProtocolBufferException(e)
+            .setUnfinishedMessage(builder.buildPartial());
+      }
+      return builder.buildPartial();
+    }
+  };
+
+  public static com.google.protobuf.Parser parser() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.protobuf.Parser getParserForType() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public org.vdaas.vald.api.v1.rpc.BadRequest getDefaultInstanceForType() {
+    return DEFAULT_INSTANCE;
+  }
+
+}
+
diff --git a/src/main/java/org/vdaas/vald/api/v1/rpc/BadRequestOrBuilder.java b/src/main/java/org/vdaas/vald/api/v1/rpc/BadRequestOrBuilder.java
new file mode 100644
index 00000000..92cfacc5
--- /dev/null
+++ b/src/main/java/org/vdaas/vald/api/v1/rpc/BadRequestOrBuilder.java
@@ -0,0 +1,53 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: apis/proto/v1/rpc/error_details.proto
+
+package org.vdaas.vald.api.v1.rpc;
+
+public interface BadRequestOrBuilder extends
+    // @@protoc_insertion_point(interface_extends:rpc.v1.BadRequest)
+    com.google.protobuf.MessageOrBuilder {
+
+  /**
+   * 
+   * Describes all violations in a client request.
+   * 

+   *
+   * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+   */
+  java.util.List 
+      getFieldViolationsList();
+  /**
+   * 
+   * Describes all violations in a client request.
+   * 

+   *
+   * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+   */
+  org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolation getFieldViolations(int index);
+  /**
+   * 
+   * Describes all violations in a client request.
+   * 

+   *
+   * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+   */
+  int getFieldViolationsCount();
+  /**
+   * 
+   * Describes all violations in a client request.
+   * 

+   *
+   * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+   */
+  java.util.List 
+      getFieldViolationsOrBuilderList();
+  /**
+   * 
+   * Describes all violations in a client request.
+   * 

+   *
+   * repeated .rpc.v1.BadRequest.FieldViolation field_violations = 1;
+   */
+  org.vdaas.vald.api.v1.rpc.BadRequest.FieldViolationOrBuilder getFieldViolationsOrBuilder(
+      int index);
+}
diff --git a/src/main/java/org/vdaas/vald/api/v1/rpc/DebugInfo.java b/src/main/java/org/vdaas/vald/api/v1/rpc/DebugInfo.java
new file mode 100644
index 00000000..910143e5
--- /dev/null
+++ b/src/main/java/org/vdaas/vald/api/v1/rpc/DebugInfo.java
@@ -0,0 +1,818 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: apis/proto/v1/rpc/error_details.proto
+
+package org.vdaas.vald.api.v1.rpc;
+
+/**
+ * 
+ * Describes additional debugging info.
+ * 

+ *
+ * Protobuf type {@code rpc.v1.DebugInfo}
+ */
+public final class DebugInfo extends
+    com.google.protobuf.GeneratedMessageV3 implements
+    // @@protoc_insertion_point(message_implements:rpc.v1.DebugInfo)
+    DebugInfoOrBuilder {
+private static final long serialVersionUID = 0L;
+  // Use DebugInfo.newBuilder() to construct.
+  private DebugInfo(com.google.protobuf.GeneratedMessageV3.Builder builder) {
+    super(builder);
+  }
+  private DebugInfo() {
+    stackEntries_ =
+        com.google.protobuf.LazyStringArrayList.emptyList();
+    detail_ = "";
+  }
+
+  @java.lang.Override
+  @SuppressWarnings({"unused"})
+  protected java.lang.Object newInstance(
+      UnusedPrivateParameter unused) {
+    return new DebugInfo();
+  }
+
+  public static final com.google.protobuf.Descriptors.Descriptor
+      getDescriptor() {
+    return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_DebugInfo_descriptor;
+  }
+
+  @java.lang.Override
+  protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internalGetFieldAccessorTable() {
+    return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_DebugInfo_fieldAccessorTable
+        .ensureFieldAccessorsInitialized(
+            org.vdaas.vald.api.v1.rpc.DebugInfo.class, org.vdaas.vald.api.v1.rpc.DebugInfo.Builder.class);
+  }
+
+  public static final int STACK_ENTRIES_FIELD_NUMBER = 1;
+  @SuppressWarnings("serial")
+  private com.google.protobuf.LazyStringArrayList stackEntries_ =
+      com.google.protobuf.LazyStringArrayList.emptyList();
+  /**
+   * 
+   * The stack trace entries indicating where the error occurred.
+   * 

+   *
+   * repeated string stack_entries = 1;
+   * @return A list containing the stackEntries.
+   */
+  public com.google.protobuf.ProtocolStringList
+      getStackEntriesList() {
+    return stackEntries_;
+  }
+  /**
+   * 
+   * The stack trace entries indicating where the error occurred.
+   * 

+   *
+   * repeated string stack_entries = 1;
+   * @return The count of stackEntries.
+   */
+  public int getStackEntriesCount() {
+    return stackEntries_.size();
+  }
+  /**
+   * 
+   * The stack trace entries indicating where the error occurred.
+   * 

+   *
+   * repeated string stack_entries = 1;
+   * @param index The index of the element to return.
+   * @return The stackEntries at the given index.
+   */
+  public java.lang.String getStackEntries(int index) {
+    return stackEntries_.get(index);
+  }
+  /**
+   * 
+   * The stack trace entries indicating where the error occurred.
+   * 

+   *
+   * repeated string stack_entries = 1;
+   * @param index The index of the value to return.
+   * @return The bytes of the stackEntries at the given index.
+   */
+  public com.google.protobuf.ByteString
+      getStackEntriesBytes(int index) {
+    return stackEntries_.getByteString(index);
+  }
+
+  public static final int DETAIL_FIELD_NUMBER = 2;
+  @SuppressWarnings("serial")
+  private volatile java.lang.Object detail_ = "";
+  /**
+   * 
+   * Additional debugging information provided by the server.
+   * 

+   *
+   * string detail = 2;
+   * @return The detail.
+   */
+  @java.lang.Override
+  public java.lang.String getDetail() {
+    java.lang.Object ref = detail_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = 
+          (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      detail_ = s;
+      return s;
+    }
+  }
+  /**
+   * 
+   * Additional debugging information provided by the server.
+   * 

+   *
+   * string detail = 2;
+   * @return The bytes for detail.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString
+      getDetailBytes() {
+    java.lang.Object ref = detail_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b = 
+          com.google.protobuf.ByteString.copyFromUtf8(
+              (java.lang.String) ref);
+      detail_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  private byte memoizedIsInitialized = -1;
+  @java.lang.Override
+  public final boolean isInitialized() {
+    byte isInitialized = memoizedIsInitialized;
+    if (isInitialized == 1) return true;
+    if (isInitialized == 0) return false;
+
+    memoizedIsInitialized = 1;
+    return true;
+  }
+
+  @java.lang.Override
+  public void writeTo(com.google.protobuf.CodedOutputStream output)
+                      throws java.io.IOException {
+    for (int i = 0; i < stackEntries_.size(); i++) {
+      com.google.protobuf.GeneratedMessageV3.writeString(output, 1, stackEntries_.getRaw(i));
+    }
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(detail_)) {
+      com.google.protobuf.GeneratedMessageV3.writeString(output, 2, detail_);
+    }
+    getUnknownFields().writeTo(output);
+  }
+
+  @java.lang.Override
+  public int getSerializedSize() {
+    int size = memoizedSize;
+    if (size != -1) return size;
+
+    size = 0;
+    {
+      int dataSize = 0;
+      for (int i = 0; i < stackEntries_.size(); i++) {
+        dataSize += computeStringSizeNoTag(stackEntries_.getRaw(i));
+      }
+      size += dataSize;
+      size += 1 * getStackEntriesList().size();
+    }
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(detail_)) {
+      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, detail_);
+    }
+    size += getUnknownFields().getSerializedSize();
+    memoizedSize = size;
+    return size;
+  }
+
+  @java.lang.Override
+  public boolean equals(final java.lang.Object obj) {
+    if (obj == this) {
+     return true;
+    }
+    if (!(obj instanceof org.vdaas.vald.api.v1.rpc.DebugInfo)) {
+      return super.equals(obj);
+    }
+    org.vdaas.vald.api.v1.rpc.DebugInfo other = (org.vdaas.vald.api.v1.rpc.DebugInfo) obj;
+
+    if (!getStackEntriesList()
+        .equals(other.getStackEntriesList())) return false;
+    if (!getDetail()
+        .equals(other.getDetail())) return false;
+    if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+    return true;
+  }
+
+  @java.lang.Override
+  public int hashCode() {
+    if (memoizedHashCode != 0) {
+      return memoizedHashCode;
+    }
+    int hash = 41;
+    hash = (19 * hash) + getDescriptor().hashCode();
+    if (getStackEntriesCount() > 0) {
+      hash = (37 * hash) + STACK_ENTRIES_FIELD_NUMBER;
+      hash = (53 * hash) + getStackEntriesList().hashCode();
+    }
+    hash = (37 * hash) + DETAIL_FIELD_NUMBER;
+    hash = (53 * hash) + getDetail().hashCode();
+    hash = (29 * hash) + getUnknownFields().hashCode();
+    memoizedHashCode = hash;
+    return hash;
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.DebugInfo parseFrom(
+      java.nio.ByteBuffer data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.DebugInfo parseFrom(
+      java.nio.ByteBuffer data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.DebugInfo parseFrom(
+      com.google.protobuf.ByteString data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.DebugInfo parseFrom(
+      com.google.protobuf.ByteString data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.DebugInfo parseFrom(byte[] data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.DebugInfo parseFrom(
+      byte[] data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.DebugInfo parseFrom(java.io.InputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input);
+  }
+  public static org.vdaas.vald.api.v1.rpc.DebugInfo parseFrom(
+      java.io.InputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input, extensionRegistry);
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.DebugInfo parseDelimitedFrom(java.io.InputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseDelimitedWithIOException(PARSER, input);
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.DebugInfo parseDelimitedFrom(
+      java.io.InputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.DebugInfo parseFrom(
+      com.google.protobuf.CodedInputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input);
+  }
+  public static org.vdaas.vald.api.v1.rpc.DebugInfo parseFrom(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input, extensionRegistry);
+  }
+
+  @java.lang.Override
+  public Builder newBuilderForType() { return newBuilder(); }
+  public static Builder newBuilder() {
+    return DEFAULT_INSTANCE.toBuilder();
+  }
+  public static Builder newBuilder(org.vdaas.vald.api.v1.rpc.DebugInfo prototype) {
+    return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+  }
+  @java.lang.Override
+  public Builder toBuilder() {
+    return this == DEFAULT_INSTANCE
+        ? new Builder() : new Builder().mergeFrom(this);
+  }
+
+  @java.lang.Override
+  protected Builder newBuilderForType(
+      com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+    Builder builder = new Builder(parent);
+    return builder;
+  }
+  /**
+   * 
+   * Describes additional debugging info.
+   * 

+   *
+   * Protobuf type {@code rpc.v1.DebugInfo}
+   */
+  public static final class Builder extends
+      com.google.protobuf.GeneratedMessageV3.Builder implements
+      // @@protoc_insertion_point(builder_implements:rpc.v1.DebugInfo)
+      org.vdaas.vald.api.v1.rpc.DebugInfoOrBuilder {
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_DebugInfo_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_DebugInfo_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              org.vdaas.vald.api.v1.rpc.DebugInfo.class, org.vdaas.vald.api.v1.rpc.DebugInfo.Builder.class);
+    }
+
+    // Construct using org.vdaas.vald.api.v1.rpc.DebugInfo.newBuilder()
+    private Builder() {
+
+    }
+
+    private Builder(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      super(parent);
+
+    }
+    @java.lang.Override
+    public Builder clear() {
+      super.clear();
+      bitField0_ = 0;
+      stackEntries_ =
+          com.google.protobuf.LazyStringArrayList.emptyList();
+      detail_ = "";
+      return this;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.Descriptor
+        getDescriptorForType() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_DebugInfo_descriptor;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.DebugInfo getDefaultInstanceForType() {
+      return org.vdaas.vald.api.v1.rpc.DebugInfo.getDefaultInstance();
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.DebugInfo build() {
+      org.vdaas.vald.api.v1.rpc.DebugInfo result = buildPartial();
+      if (!result.isInitialized()) {
+        throw newUninitializedMessageException(result);
+      }
+      return result;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.DebugInfo buildPartial() {
+      org.vdaas.vald.api.v1.rpc.DebugInfo result = new org.vdaas.vald.api.v1.rpc.DebugInfo(this);
+      if (bitField0_ != 0) { buildPartial0(result); }
+      onBuilt();
+      return result;
+    }
+
+    private void buildPartial0(org.vdaas.vald.api.v1.rpc.DebugInfo result) {
+      int from_bitField0_ = bitField0_;
+      if (((from_bitField0_ & 0x00000001) != 0)) {
+        stackEntries_.makeImmutable();
+        result.stackEntries_ = stackEntries_;
+      }
+      if (((from_bitField0_ & 0x00000002) != 0)) {
+        result.detail_ = detail_;
+      }
+    }
+
+    @java.lang.Override
+    public Builder clone() {
+      return super.clone();
+    }
+    @java.lang.Override
+    public Builder setField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        java.lang.Object value) {
+      return super.setField(field, value);
+    }
+    @java.lang.Override
+    public Builder clearField(
+        com.google.protobuf.Descriptors.FieldDescriptor field) {
+      return super.clearField(field);
+    }
+    @java.lang.Override
+    public Builder clearOneof(
+        com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+      return super.clearOneof(oneof);
+    }
+    @java.lang.Override
+    public Builder setRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        int index, java.lang.Object value) {
+      return super.setRepeatedField(field, index, value);
+    }
+    @java.lang.Override
+    public Builder addRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        java.lang.Object value) {
+      return super.addRepeatedField(field, value);
+    }
+    @java.lang.Override
+    public Builder mergeFrom(com.google.protobuf.Message other) {
+      if (other instanceof org.vdaas.vald.api.v1.rpc.DebugInfo) {
+        return mergeFrom((org.vdaas.vald.api.v1.rpc.DebugInfo)other);
+      } else {
+        super.mergeFrom(other);
+        return this;
+      }
+    }
+
+    public Builder mergeFrom(org.vdaas.vald.api.v1.rpc.DebugInfo other) {
+      if (other == org.vdaas.vald.api.v1.rpc.DebugInfo.getDefaultInstance()) return this;
+      if (!other.stackEntries_.isEmpty()) {
+        if (stackEntries_.isEmpty()) {
+          stackEntries_ = other.stackEntries_;
+          bitField0_ |= 0x00000001;
+        } else {
+          ensureStackEntriesIsMutable();
+          stackEntries_.addAll(other.stackEntries_);
+        }
+        onChanged();
+      }
+      if (!other.getDetail().isEmpty()) {
+        detail_ = other.detail_;
+        bitField0_ |= 0x00000002;
+        onChanged();
+      }
+      this.mergeUnknownFields(other.getUnknownFields());
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      return true;
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      if (extensionRegistry == null) {
+        throw new java.lang.NullPointerException();
+      }
+      try {
+        boolean done = false;
+        while (!done) {
+          int tag = input.readTag();
+          switch (tag) {
+            case 0:
+              done = true;
+              break;
+            case 10: {
+              java.lang.String s = input.readStringRequireUtf8();
+              ensureStackEntriesIsMutable();
+              stackEntries_.add(s);
+              break;
+            } // case 10
+            case 18: {
+              detail_ = input.readStringRequireUtf8();
+              bitField0_ |= 0x00000002;
+              break;
+            } // case 18
+            default: {
+              if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                done = true; // was an endgroup tag
+              }
+              break;
+            } // default:
+          } // switch (tag)
+        } // while (!done)
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.unwrapIOException();
+      } finally {
+        onChanged();
+      } // finally
+      return this;
+    }
+    private int bitField0_;
+
+    private com.google.protobuf.LazyStringArrayList stackEntries_ =
+        com.google.protobuf.LazyStringArrayList.emptyList();
+    private void ensureStackEntriesIsMutable() {
+      if (!stackEntries_.isModifiable()) {
+        stackEntries_ = new com.google.protobuf.LazyStringArrayList(stackEntries_);
+      }
+      bitField0_ |= 0x00000001;
+    }
+    /**
+     * 
+     * The stack trace entries indicating where the error occurred.
+     * 

+     *
+     * repeated string stack_entries = 1;
+     * @return A list containing the stackEntries.
+     */
+    public com.google.protobuf.ProtocolStringList
+        getStackEntriesList() {
+      stackEntries_.makeImmutable();
+      return stackEntries_;
+    }
+    /**
+     * 
+     * The stack trace entries indicating where the error occurred.
+     * 

+     *
+     * repeated string stack_entries = 1;
+     * @return The count of stackEntries.
+     */
+    public int getStackEntriesCount() {
+      return stackEntries_.size();
+    }
+    /**
+     * 
+     * The stack trace entries indicating where the error occurred.
+     * 

+     *
+     * repeated string stack_entries = 1;
+     * @param index The index of the element to return.
+     * @return The stackEntries at the given index.
+     */
+    public java.lang.String getStackEntries(int index) {
+      return stackEntries_.get(index);
+    }
+    /**
+     * 
+     * The stack trace entries indicating where the error occurred.
+     * 

+     *
+     * repeated string stack_entries = 1;
+     * @param index The index of the value to return.
+     * @return The bytes of the stackEntries at the given index.
+     */
+    public com.google.protobuf.ByteString
+        getStackEntriesBytes(int index) {
+      return stackEntries_.getByteString(index);
+    }
+    /**
+     * 
+     * The stack trace entries indicating where the error occurred.
+     * 

+     *
+     * repeated string stack_entries = 1;
+     * @param index The index to set the value at.
+     * @param value The stackEntries to set.
+     * @return This builder for chaining.
+     */
+    public Builder setStackEntries(
+        int index, java.lang.String value) {
+      if (value == null) { throw new NullPointerException(); }
+      ensureStackEntriesIsMutable();
+      stackEntries_.set(index, value);
+      bitField0_ |= 0x00000001;
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * The stack trace entries indicating where the error occurred.
+     * 

+     *
+     * repeated string stack_entries = 1;
+     * @param value The stackEntries to add.
+     * @return This builder for chaining.
+     */
+    public Builder addStackEntries(
+        java.lang.String value) {
+      if (value == null) { throw new NullPointerException(); }
+      ensureStackEntriesIsMutable();
+      stackEntries_.add(value);
+      bitField0_ |= 0x00000001;
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * The stack trace entries indicating where the error occurred.
+     * 

+     *
+     * repeated string stack_entries = 1;
+     * @param values The stackEntries to add.
+     * @return This builder for chaining.
+     */
+    public Builder addAllStackEntries(
+        java.lang.Iterable values) {
+      ensureStackEntriesIsMutable();
+      com.google.protobuf.AbstractMessageLite.Builder.addAll(
+          values, stackEntries_);
+      bitField0_ |= 0x00000001;
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * The stack trace entries indicating where the error occurred.
+     * 

+     *
+     * repeated string stack_entries = 1;
+     * @return This builder for chaining.
+     */
+    public Builder clearStackEntries() {
+      stackEntries_ =
+        com.google.protobuf.LazyStringArrayList.emptyList();
+      bitField0_ = (bitField0_ & ~0x00000001);;
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * The stack trace entries indicating where the error occurred.
+     * 

+     *
+     * repeated string stack_entries = 1;
+     * @param value The bytes of the stackEntries to add.
+     * @return This builder for chaining.
+     */
+    public Builder addStackEntriesBytes(
+        com.google.protobuf.ByteString value) {
+      if (value == null) { throw new NullPointerException(); }
+      checkByteStringIsUtf8(value);
+      ensureStackEntriesIsMutable();
+      stackEntries_.add(value);
+      bitField0_ |= 0x00000001;
+      onChanged();
+      return this;
+    }
+
+    private java.lang.Object detail_ = "";
+    /**
+     * 
+     * Additional debugging information provided by the server.
+     * 

+     *
+     * string detail = 2;
+     * @return The detail.
+     */
+    public java.lang.String getDetail() {
+      java.lang.Object ref = detail_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs =
+            (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        detail_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     * 
+     * Additional debugging information provided by the server.
+     * 

+     *
+     * string detail = 2;
+     * @return The bytes for detail.
+     */
+    public com.google.protobuf.ByteString
+        getDetailBytes() {
+      java.lang.Object ref = detail_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b = 
+            com.google.protobuf.ByteString.copyFromUtf8(
+                (java.lang.String) ref);
+        detail_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     * 
+     * Additional debugging information provided by the server.
+     * 

+     *
+     * string detail = 2;
+     * @param value The detail to set.
+     * @return This builder for chaining.
+     */
+    public Builder setDetail(
+        java.lang.String value) {
+      if (value == null) { throw new NullPointerException(); }
+      detail_ = value;
+      bitField0_ |= 0x00000002;
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * Additional debugging information provided by the server.
+     * 

+     *
+     * string detail = 2;
+     * @return This builder for chaining.
+     */
+    public Builder clearDetail() {
+      detail_ = getDefaultInstance().getDetail();
+      bitField0_ = (bitField0_ & ~0x00000002);
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * Additional debugging information provided by the server.
+     * 

+     *
+     * string detail = 2;
+     * @param value The bytes for detail to set.
+     * @return This builder for chaining.
+     */
+    public Builder setDetailBytes(
+        com.google.protobuf.ByteString value) {
+      if (value == null) { throw new NullPointerException(); }
+      checkByteStringIsUtf8(value);
+      detail_ = value;
+      bitField0_ |= 0x00000002;
+      onChanged();
+      return this;
+    }
+    @java.lang.Override
+    public final Builder setUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.setUnknownFields(unknownFields);
+    }
+
+    @java.lang.Override
+    public final Builder mergeUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.mergeUnknownFields(unknownFields);
+    }
+
+
+    // @@protoc_insertion_point(builder_scope:rpc.v1.DebugInfo)
+  }
+
+  // @@protoc_insertion_point(class_scope:rpc.v1.DebugInfo)
+  private static final org.vdaas.vald.api.v1.rpc.DebugInfo DEFAULT_INSTANCE;
+  static {
+    DEFAULT_INSTANCE = new org.vdaas.vald.api.v1.rpc.DebugInfo();
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.DebugInfo getDefaultInstance() {
+    return DEFAULT_INSTANCE;
+  }
+
+  private static final com.google.protobuf.Parser
+      PARSER = new com.google.protobuf.AbstractParser() {
+    @java.lang.Override
+    public DebugInfo parsePartialFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      Builder builder = newBuilder();
+      try {
+        builder.mergeFrom(input, extensionRegistry);
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(builder.buildPartial());
+      } catch (com.google.protobuf.UninitializedMessageException e) {
+        throw e.asInvalidProtocolBufferException().setUnfinishedMessage(builder.buildPartial());
+      } catch (java.io.IOException e) {
+        throw new com.google.protobuf.InvalidProtocolBufferException(e)
+            .setUnfinishedMessage(builder.buildPartial());
+      }
+      return builder.buildPartial();
+    }
+  };
+
+  public static com.google.protobuf.Parser parser() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.protobuf.Parser getParserForType() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public org.vdaas.vald.api.v1.rpc.DebugInfo getDefaultInstanceForType() {
+    return DEFAULT_INSTANCE;
+  }
+
+}
+
diff --git a/src/main/java/org/vdaas/vald/api/v1/rpc/DebugInfoOrBuilder.java b/src/main/java/org/vdaas/vald/api/v1/rpc/DebugInfoOrBuilder.java
new file mode 100644
index 00000000..dec7440e
--- /dev/null
+++ b/src/main/java/org/vdaas/vald/api/v1/rpc/DebugInfoOrBuilder.java
@@ -0,0 +1,70 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: apis/proto/v1/rpc/error_details.proto
+
+package org.vdaas.vald.api.v1.rpc;
+
+public interface DebugInfoOrBuilder extends
+    // @@protoc_insertion_point(interface_extends:rpc.v1.DebugInfo)
+    com.google.protobuf.MessageOrBuilder {
+
+  /**
+   * 
+   * The stack trace entries indicating where the error occurred.
+   * 

+   *
+   * repeated string stack_entries = 1;
+   * @return A list containing the stackEntries.
+   */
+  java.util.List
+      getStackEntriesList();
+  /**
+   * 
+   * The stack trace entries indicating where the error occurred.
+   * 

+   *
+   * repeated string stack_entries = 1;
+   * @return The count of stackEntries.
+   */
+  int getStackEntriesCount();
+  /**
+   * 
+   * The stack trace entries indicating where the error occurred.
+   * 

+   *
+   * repeated string stack_entries = 1;
+   * @param index The index of the element to return.
+   * @return The stackEntries at the given index.
+   */
+  java.lang.String getStackEntries(int index);
+  /**
+   * 
+   * The stack trace entries indicating where the error occurred.
+   * 

+   *
+   * repeated string stack_entries = 1;
+   * @param index The index of the value to return.
+   * @return The bytes of the stackEntries at the given index.
+   */
+  com.google.protobuf.ByteString
+      getStackEntriesBytes(int index);
+
+  /**
+   * 
+   * Additional debugging information provided by the server.
+   * 

+   *
+   * string detail = 2;
+   * @return The detail.
+   */
+  java.lang.String getDetail();
+  /**
+   * 
+   * Additional debugging information provided by the server.
+   * 

+   *
+   * string detail = 2;
+   * @return The bytes for detail.
+   */
+  com.google.protobuf.ByteString
+      getDetailBytes();
+}
diff --git a/src/main/java/org/vdaas/vald/api/v1/rpc/ErrorDetailsProto.java b/src/main/java/org/vdaas/vald/api/v1/rpc/ErrorDetailsProto.java
new file mode 100644
index 00000000..3949890b
--- /dev/null
+++ b/src/main/java/org/vdaas/vald/api/v1/rpc/ErrorDetailsProto.java
@@ -0,0 +1,230 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: apis/proto/v1/rpc/error_details.proto
+
+package org.vdaas.vald.api.v1.rpc;
+
+public final class ErrorDetailsProto {
+  private ErrorDetailsProto() {}
+  public static void registerAllExtensions(
+      com.google.protobuf.ExtensionRegistryLite registry) {
+  }
+
+  public static void registerAllExtensions(
+      com.google.protobuf.ExtensionRegistry registry) {
+    registerAllExtensions(
+        (com.google.protobuf.ExtensionRegistryLite) registry);
+  }
+  static final com.google.protobuf.Descriptors.Descriptor
+    internal_static_rpc_v1_ErrorInfo_descriptor;
+  static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_rpc_v1_ErrorInfo_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+    internal_static_rpc_v1_ErrorInfo_MetadataEntry_descriptor;
+  static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_rpc_v1_ErrorInfo_MetadataEntry_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+    internal_static_rpc_v1_RetryInfo_descriptor;
+  static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_rpc_v1_RetryInfo_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+    internal_static_rpc_v1_DebugInfo_descriptor;
+  static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_rpc_v1_DebugInfo_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+    internal_static_rpc_v1_QuotaFailure_descriptor;
+  static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_rpc_v1_QuotaFailure_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+    internal_static_rpc_v1_QuotaFailure_Violation_descriptor;
+  static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_rpc_v1_QuotaFailure_Violation_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+    internal_static_rpc_v1_PreconditionFailure_descriptor;
+  static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_rpc_v1_PreconditionFailure_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+    internal_static_rpc_v1_PreconditionFailure_Violation_descriptor;
+  static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_rpc_v1_PreconditionFailure_Violation_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+    internal_static_rpc_v1_BadRequest_descriptor;
+  static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_rpc_v1_BadRequest_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+    internal_static_rpc_v1_BadRequest_FieldViolation_descriptor;
+  static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_rpc_v1_BadRequest_FieldViolation_fieldAccessorTable;
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+    internal_static_rpc_v1_RequestInfo_descriptor;
+  static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_rpc_v1_RequestInfo_fieldAccessorTable;
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+    internal_static_rpc_v1_ResourceInfo_descriptor;
+  static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_rpc_v1_ResourceInfo_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+    internal_static_rpc_v1_Help_descriptor;
+  static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_rpc_v1_Help_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+    internal_static_rpc_v1_Help_Link_descriptor;
+  static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_rpc_v1_Help_Link_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+    internal_static_rpc_v1_LocalizedMessage_descriptor;
+  static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_rpc_v1_LocalizedMessage_fieldAccessorTable;
+
+  public static com.google.protobuf.Descriptors.FileDescriptor
+      getDescriptor() {
+    return descriptor;
+  }
+  private static  com.google.protobuf.Descriptors.FileDescriptor
+      descriptor;
+  static {
+    java.lang.String[] descriptorData = {
+      "\n%apis/proto/v1/rpc/error_details.proto\022" +
+      "\006rpc.v1\032\036google/protobuf/duration.proto\"" +
+      "\217\001\n\tErrorInfo\022\016\n\006reason\030\001 \001(\t\022\016\n\006domain\030" +
+      "\002 \001(\t\0221\n\010metadata\030\003 \003(\0132\037.rpc.v1.ErrorIn" +
+      "fo.MetadataEntry\032/\n\rMetadataEntry\022\013\n\003key" +
+      "\030\001 \001(\t\022\r\n\005value\030\002 \001(\t:\0028\001\";\n\tRetryInfo\022." +
+      "\n\013retry_delay\030\001 \001(\0132\031.google.protobuf.Du" +
+      "ration\"2\n\tDebugInfo\022\025\n\rstack_entries\030\001 \003" +
+      "(\t\022\016\n\006detail\030\002 \001(\t\"u\n\014QuotaFailure\0222\n\nvi" +
+      "olations\030\001 \003(\0132\036.rpc.v1.QuotaFailure.Vio" +
+      "lation\0321\n\tViolation\022\017\n\007subject\030\001 \001(\t\022\023\n\013" +
+      "description\030\002 \001(\t\"\221\001\n\023PreconditionFailur" +
+      "e\0229\n\nviolations\030\001 \003(\0132%.rpc.v1.Precondit" +
+      "ionFailure.Violation\032?\n\tViolation\022\014\n\004typ" +
+      "e\030\001 \001(\t\022\017\n\007subject\030\002 \001(\t\022\023\n\013description\030" +
+      "\003 \001(\t\"\177\n\nBadRequest\022;\n\020field_violations\030" +
+      "\001 \003(\0132!.rpc.v1.BadRequest.FieldViolation" +
+      "\0324\n\016FieldViolation\022\r\n\005field\030\001 \001(\t\022\023\n\013des" +
+      "cription\030\002 \001(\t\"7\n\013RequestInfo\022\022\n\nrequest" +
+      "_id\030\001 \001(\t\022\024\n\014serving_data\030\002 \001(\t\"`\n\014Resou" +
+      "rceInfo\022\025\n\rresource_type\030\001 \001(\t\022\025\n\rresour" +
+      "ce_name\030\002 \001(\t\022\r\n\005owner\030\003 \001(\t\022\023\n\013descript" +
+      "ion\030\004 \001(\t\"R\n\004Help\022 \n\005links\030\001 \003(\0132\021.rpc.v" +
+      "1.Help.Link\032(\n\004Link\022\023\n\013description\030\001 \001(\t" +
+      "\022\013\n\003url\030\002 \001(\t\"3\n\020LocalizedMessage\022\016\n\006loc" +
+      "ale\030\001 \001(\t\022\017\n\007message\030\002 \001(\tBi\n\031org.vdaas." +
+      "vald.api.v1.rpcB\021ErrorDetailsProtoP\001Z1gi" +
+      "thub.com/vdaas/vald/apis/grpc/v1/rpc/err" +
+      "details\242\002\003RPCb\006proto3"
+    };
+    descriptor = com.google.protobuf.Descriptors.FileDescriptor
+      .internalBuildGeneratedFileFrom(descriptorData,
+        new com.google.protobuf.Descriptors.FileDescriptor[] {
+          com.google.protobuf.DurationProto.getDescriptor(),
+        });
+    internal_static_rpc_v1_ErrorInfo_descriptor =
+      getDescriptor().getMessageTypes().get(0);
+    internal_static_rpc_v1_ErrorInfo_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_rpc_v1_ErrorInfo_descriptor,
+        new java.lang.String[] { "Reason", "Domain", "Metadata", });
+    internal_static_rpc_v1_ErrorInfo_MetadataEntry_descriptor =
+      internal_static_rpc_v1_ErrorInfo_descriptor.getNestedTypes().get(0);
+    internal_static_rpc_v1_ErrorInfo_MetadataEntry_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_rpc_v1_ErrorInfo_MetadataEntry_descriptor,
+        new java.lang.String[] { "Key", "Value", });
+    internal_static_rpc_v1_RetryInfo_descriptor =
+      getDescriptor().getMessageTypes().get(1);
+    internal_static_rpc_v1_RetryInfo_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_rpc_v1_RetryInfo_descriptor,
+        new java.lang.String[] { "RetryDelay", });
+    internal_static_rpc_v1_DebugInfo_descriptor =
+      getDescriptor().getMessageTypes().get(2);
+    internal_static_rpc_v1_DebugInfo_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_rpc_v1_DebugInfo_descriptor,
+        new java.lang.String[] { "StackEntries", "Detail", });
+    internal_static_rpc_v1_QuotaFailure_descriptor =
+      getDescriptor().getMessageTypes().get(3);
+    internal_static_rpc_v1_QuotaFailure_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_rpc_v1_QuotaFailure_descriptor,
+        new java.lang.String[] { "Violations", });
+    internal_static_rpc_v1_QuotaFailure_Violation_descriptor =
+      internal_static_rpc_v1_QuotaFailure_descriptor.getNestedTypes().get(0);
+    internal_static_rpc_v1_QuotaFailure_Violation_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_rpc_v1_QuotaFailure_Violation_descriptor,
+        new java.lang.String[] { "Subject", "Description", });
+    internal_static_rpc_v1_PreconditionFailure_descriptor =
+      getDescriptor().getMessageTypes().get(4);
+    internal_static_rpc_v1_PreconditionFailure_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_rpc_v1_PreconditionFailure_descriptor,
+        new java.lang.String[] { "Violations", });
+    internal_static_rpc_v1_PreconditionFailure_Violation_descriptor =
+      internal_static_rpc_v1_PreconditionFailure_descriptor.getNestedTypes().get(0);
+    internal_static_rpc_v1_PreconditionFailure_Violation_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_rpc_v1_PreconditionFailure_Violation_descriptor,
+        new java.lang.String[] { "Type", "Subject", "Description", });
+    internal_static_rpc_v1_BadRequest_descriptor =
+      getDescriptor().getMessageTypes().get(5);
+    internal_static_rpc_v1_BadRequest_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_rpc_v1_BadRequest_descriptor,
+        new java.lang.String[] { "FieldViolations", });
+    internal_static_rpc_v1_BadRequest_FieldViolation_descriptor =
+      internal_static_rpc_v1_BadRequest_descriptor.getNestedTypes().get(0);
+    internal_static_rpc_v1_BadRequest_FieldViolation_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_rpc_v1_BadRequest_FieldViolation_descriptor,
+        new java.lang.String[] { "Field", "Description", });
+    internal_static_rpc_v1_RequestInfo_descriptor =
+      getDescriptor().getMessageTypes().get(6);
+    internal_static_rpc_v1_RequestInfo_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_rpc_v1_RequestInfo_descriptor,
+        new java.lang.String[] { "RequestId", "ServingData", });
+    internal_static_rpc_v1_ResourceInfo_descriptor =
+      getDescriptor().getMessageTypes().get(7);
+    internal_static_rpc_v1_ResourceInfo_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_rpc_v1_ResourceInfo_descriptor,
+        new java.lang.String[] { "ResourceType", "ResourceName", "Owner", "Description", });
+    internal_static_rpc_v1_Help_descriptor =
+      getDescriptor().getMessageTypes().get(8);
+    internal_static_rpc_v1_Help_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_rpc_v1_Help_descriptor,
+        new java.lang.String[] { "Links", });
+    internal_static_rpc_v1_Help_Link_descriptor =
+      internal_static_rpc_v1_Help_descriptor.getNestedTypes().get(0);
+    internal_static_rpc_v1_Help_Link_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_rpc_v1_Help_Link_descriptor,
+        new java.lang.String[] { "Description", "Url", });
+    internal_static_rpc_v1_LocalizedMessage_descriptor =
+      getDescriptor().getMessageTypes().get(9);
+    internal_static_rpc_v1_LocalizedMessage_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_rpc_v1_LocalizedMessage_descriptor,
+        new java.lang.String[] { "Locale", "Message", });
+    com.google.protobuf.DurationProto.getDescriptor();
+  }
+
+  // @@protoc_insertion_point(outer_class_scope)
+}
diff --git a/src/main/java/org/vdaas/vald/api/v1/rpc/ErrorInfo.java b/src/main/java/org/vdaas/vald/api/v1/rpc/ErrorInfo.java
new file mode 100644
index 00000000..f3725c6b
--- /dev/null
+++ b/src/main/java/org/vdaas/vald/api/v1/rpc/ErrorInfo.java
@@ -0,0 +1,1250 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: apis/proto/v1/rpc/error_details.proto
+
+package org.vdaas.vald.api.v1.rpc;
+
+/**
+ * 
+ * Describes the cause of the error with structured details.
+ *
+ * Example of an error when contacting the "pubsub.googleapis.com" API when it
+ * is not enabled:
+ *
+ *     { "reason": "API_DISABLED"
+ *       "domain": "googleapis.com"
+ *       "metadata": {
+ *         "resource": "projects/123",
+ *         "service": "pubsub.googleapis.com"
+ *       }
+ *     }
+ *
+ * This response indicates that the pubsub.googleapis.com API is not enabled.
+ *
+ * Example of an error that is returned when attempting to create a Spanner
+ * instance in a region that is out of stock:
+ *
+ *     { "reason": "STOCKOUT"
+ *       "domain": "spanner.googleapis.com",
+ *       "metadata": {
+ *         "availableRegions": "us-central1,us-east2"
+ *       }
+ *     }
+ * 

+ *
+ * Protobuf type {@code rpc.v1.ErrorInfo}
+ */
+public final class ErrorInfo extends
+    com.google.protobuf.GeneratedMessageV3 implements
+    // @@protoc_insertion_point(message_implements:rpc.v1.ErrorInfo)
+    ErrorInfoOrBuilder {
+private static final long serialVersionUID = 0L;
+  // Use ErrorInfo.newBuilder() to construct.
+  private ErrorInfo(com.google.protobuf.GeneratedMessageV3.Builder builder) {
+    super(builder);
+  }
+  private ErrorInfo() {
+    reason_ = "";
+    domain_ = "";
+  }
+
+  @java.lang.Override
+  @SuppressWarnings({"unused"})
+  protected java.lang.Object newInstance(
+      UnusedPrivateParameter unused) {
+    return new ErrorInfo();
+  }
+
+  public static final com.google.protobuf.Descriptors.Descriptor
+      getDescriptor() {
+    return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_ErrorInfo_descriptor;
+  }
+
+  @SuppressWarnings({"rawtypes"})
+  @java.lang.Override
+  protected com.google.protobuf.MapField internalGetMapField(
+      int number) {
+    switch (number) {
+      case 3:
+        return internalGetMetadata();
+      default:
+        throw new RuntimeException(
+            "Invalid map field number: " + number);
+    }
+  }
+  @java.lang.Override
+  protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internalGetFieldAccessorTable() {
+    return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_ErrorInfo_fieldAccessorTable
+        .ensureFieldAccessorsInitialized(
+            org.vdaas.vald.api.v1.rpc.ErrorInfo.class, org.vdaas.vald.api.v1.rpc.ErrorInfo.Builder.class);
+  }
+
+  public static final int REASON_FIELD_NUMBER = 1;
+  @SuppressWarnings("serial")
+  private volatile java.lang.Object reason_ = "";
+  /**
+   * 
+   * The reason of the error. This is a constant value that identifies the
+   * proximate cause of the error. Error reasons are unique within a particular
+   * domain of errors. This should be at most 63 characters and match a
+   * regular expression of `[A-Z][A-Z0-9_]+[A-Z0-9]`, which represents
+   * UPPER_SNAKE_CASE.
+   * 

+   *
+   * string reason = 1;
+   * @return The reason.
+   */
+  @java.lang.Override
+  public java.lang.String getReason() {
+    java.lang.Object ref = reason_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = 
+          (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      reason_ = s;
+      return s;
+    }
+  }
+  /**
+   * 
+   * The reason of the error. This is a constant value that identifies the
+   * proximate cause of the error. Error reasons are unique within a particular
+   * domain of errors. This should be at most 63 characters and match a
+   * regular expression of `[A-Z][A-Z0-9_]+[A-Z0-9]`, which represents
+   * UPPER_SNAKE_CASE.
+   * 

+   *
+   * string reason = 1;
+   * @return The bytes for reason.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString
+      getReasonBytes() {
+    java.lang.Object ref = reason_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b = 
+          com.google.protobuf.ByteString.copyFromUtf8(
+              (java.lang.String) ref);
+      reason_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  public static final int DOMAIN_FIELD_NUMBER = 2;
+  @SuppressWarnings("serial")
+  private volatile java.lang.Object domain_ = "";
+  /**
+   * 
+   * The logical grouping to which the "reason" belongs. The error domain
+   * is typically the registered service name of the tool or product that
+   * generates the error. Example: "pubsub.googleapis.com". If the error is
+   * generated by some common infrastructure, the error domain must be a
+   * globally unique value that identifies the infrastructure. For Google API
+   * infrastructure, the error domain is "googleapis.com".
+   * 

+   *
+   * string domain = 2;
+   * @return The domain.
+   */
+  @java.lang.Override
+  public java.lang.String getDomain() {
+    java.lang.Object ref = domain_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = 
+          (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      domain_ = s;
+      return s;
+    }
+  }
+  /**
+   * 
+   * The logical grouping to which the "reason" belongs. The error domain
+   * is typically the registered service name of the tool or product that
+   * generates the error. Example: "pubsub.googleapis.com". If the error is
+   * generated by some common infrastructure, the error domain must be a
+   * globally unique value that identifies the infrastructure. For Google API
+   * infrastructure, the error domain is "googleapis.com".
+   * 

+   *
+   * string domain = 2;
+   * @return The bytes for domain.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString
+      getDomainBytes() {
+    java.lang.Object ref = domain_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b = 
+          com.google.protobuf.ByteString.copyFromUtf8(
+              (java.lang.String) ref);
+      domain_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  public static final int METADATA_FIELD_NUMBER = 3;
+  private static final class MetadataDefaultEntryHolder {
+    static final com.google.protobuf.MapEntry<
+        java.lang.String, java.lang.String> defaultEntry =
+            com.google.protobuf.MapEntry
+            .newDefaultInstance(
+                org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_ErrorInfo_MetadataEntry_descriptor, 
+                com.google.protobuf.WireFormat.FieldType.STRING,
+                "",
+                com.google.protobuf.WireFormat.FieldType.STRING,
+                "");
+  }
+  @SuppressWarnings("serial")
+  private com.google.protobuf.MapField<
+      java.lang.String, java.lang.String> metadata_;
+  private com.google.protobuf.MapField
+  internalGetMetadata() {
+    if (metadata_ == null) {
+      return com.google.protobuf.MapField.emptyMapField(
+          MetadataDefaultEntryHolder.defaultEntry);
+    }
+    return metadata_;
+  }
+  public int getMetadataCount() {
+    return internalGetMetadata().getMap().size();
+  }
+  /**
+   * 
+   * Additional structured details about this error.
+   *
+   * Keys should match /[a-zA-Z0-9-_]/ and be limited to 64 characters in
+   * length. When identifying the current value of an exceeded limit, the units
+   * should be contained in the key, not the value.  For example, rather than
+   * {"instanceLimit": "100/request"}, should be returned as,
+   * {"instanceLimitPerRequest": "100"}, if the client exceeds the number of
+   * instances that can be created in a single (batch) request.
+   * 

+   *
+   * map<string, string> metadata = 3;
+   */
+  @java.lang.Override
+  public boolean containsMetadata(
+      java.lang.String key) {
+    if (key == null) { throw new NullPointerException("map key"); }
+    return internalGetMetadata().getMap().containsKey(key);
+  }
+  /**
+   * Use {@link #getMetadataMap()} instead.
+   */
+  @java.lang.Override
+  @java.lang.Deprecated
+  public java.util.Map getMetadata() {
+    return getMetadataMap();
+  }
+  /**
+   * 
+   * Additional structured details about this error.
+   *
+   * Keys should match /[a-zA-Z0-9-_]/ and be limited to 64 characters in
+   * length. When identifying the current value of an exceeded limit, the units
+   * should be contained in the key, not the value.  For example, rather than
+   * {"instanceLimit": "100/request"}, should be returned as,
+   * {"instanceLimitPerRequest": "100"}, if the client exceeds the number of
+   * instances that can be created in a single (batch) request.
+   * 

+   *
+   * map<string, string> metadata = 3;
+   */
+  @java.lang.Override
+  public java.util.Map getMetadataMap() {
+    return internalGetMetadata().getMap();
+  }
+  /**
+   * 
+   * Additional structured details about this error.
+   *
+   * Keys should match /[a-zA-Z0-9-_]/ and be limited to 64 characters in
+   * length. When identifying the current value of an exceeded limit, the units
+   * should be contained in the key, not the value.  For example, rather than
+   * {"instanceLimit": "100/request"}, should be returned as,
+   * {"instanceLimitPerRequest": "100"}, if the client exceeds the number of
+   * instances that can be created in a single (batch) request.
+   * 

+   *
+   * map<string, string> metadata = 3;
+   */
+  @java.lang.Override
+  public /* nullable */
+java.lang.String getMetadataOrDefault(
+      java.lang.String key,
+      /* nullable */
+java.lang.String defaultValue) {
+    if (key == null) { throw new NullPointerException("map key"); }
+    java.util.Map map =
+        internalGetMetadata().getMap();
+    return map.containsKey(key) ? map.get(key) : defaultValue;
+  }
+  /**
+   * 
+   * Additional structured details about this error.
+   *
+   * Keys should match /[a-zA-Z0-9-_]/ and be limited to 64 characters in
+   * length. When identifying the current value of an exceeded limit, the units
+   * should be contained in the key, not the value.  For example, rather than
+   * {"instanceLimit": "100/request"}, should be returned as,
+   * {"instanceLimitPerRequest": "100"}, if the client exceeds the number of
+   * instances that can be created in a single (batch) request.
+   * 

+   *
+   * map<string, string> metadata = 3;
+   */
+  @java.lang.Override
+  public java.lang.String getMetadataOrThrow(
+      java.lang.String key) {
+    if (key == null) { throw new NullPointerException("map key"); }
+    java.util.Map map =
+        internalGetMetadata().getMap();
+    if (!map.containsKey(key)) {
+      throw new java.lang.IllegalArgumentException();
+    }
+    return map.get(key);
+  }
+
+  private byte memoizedIsInitialized = -1;
+  @java.lang.Override
+  public final boolean isInitialized() {
+    byte isInitialized = memoizedIsInitialized;
+    if (isInitialized == 1) return true;
+    if (isInitialized == 0) return false;
+
+    memoizedIsInitialized = 1;
+    return true;
+  }
+
+  @java.lang.Override
+  public void writeTo(com.google.protobuf.CodedOutputStream output)
+                      throws java.io.IOException {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(reason_)) {
+      com.google.protobuf.GeneratedMessageV3.writeString(output, 1, reason_);
+    }
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(domain_)) {
+      com.google.protobuf.GeneratedMessageV3.writeString(output, 2, domain_);
+    }
+    com.google.protobuf.GeneratedMessageV3
+      .serializeStringMapTo(
+        output,
+        internalGetMetadata(),
+        MetadataDefaultEntryHolder.defaultEntry,
+        3);
+    getUnknownFields().writeTo(output);
+  }
+
+  @java.lang.Override
+  public int getSerializedSize() {
+    int size = memoizedSize;
+    if (size != -1) return size;
+
+    size = 0;
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(reason_)) {
+      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, reason_);
+    }
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(domain_)) {
+      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, domain_);
+    }
+    for (java.util.Map.Entry entry
+         : internalGetMetadata().getMap().entrySet()) {
+      com.google.protobuf.MapEntry
+      metadata__ = MetadataDefaultEntryHolder.defaultEntry.newBuilderForType()
+          .setKey(entry.getKey())
+          .setValue(entry.getValue())
+          .build();
+      size += com.google.protobuf.CodedOutputStream
+          .computeMessageSize(3, metadata__);
+    }
+    size += getUnknownFields().getSerializedSize();
+    memoizedSize = size;
+    return size;
+  }
+
+  @java.lang.Override
+  public boolean equals(final java.lang.Object obj) {
+    if (obj == this) {
+     return true;
+    }
+    if (!(obj instanceof org.vdaas.vald.api.v1.rpc.ErrorInfo)) {
+      return super.equals(obj);
+    }
+    org.vdaas.vald.api.v1.rpc.ErrorInfo other = (org.vdaas.vald.api.v1.rpc.ErrorInfo) obj;
+
+    if (!getReason()
+        .equals(other.getReason())) return false;
+    if (!getDomain()
+        .equals(other.getDomain())) return false;
+    if (!internalGetMetadata().equals(
+        other.internalGetMetadata())) return false;
+    if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+    return true;
+  }
+
+  @java.lang.Override
+  public int hashCode() {
+    if (memoizedHashCode != 0) {
+      return memoizedHashCode;
+    }
+    int hash = 41;
+    hash = (19 * hash) + getDescriptor().hashCode();
+    hash = (37 * hash) + REASON_FIELD_NUMBER;
+    hash = (53 * hash) + getReason().hashCode();
+    hash = (37 * hash) + DOMAIN_FIELD_NUMBER;
+    hash = (53 * hash) + getDomain().hashCode();
+    if (!internalGetMetadata().getMap().isEmpty()) {
+      hash = (37 * hash) + METADATA_FIELD_NUMBER;
+      hash = (53 * hash) + internalGetMetadata().hashCode();
+    }
+    hash = (29 * hash) + getUnknownFields().hashCode();
+    memoizedHashCode = hash;
+    return hash;
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.ErrorInfo parseFrom(
+      java.nio.ByteBuffer data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.ErrorInfo parseFrom(
+      java.nio.ByteBuffer data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.ErrorInfo parseFrom(
+      com.google.protobuf.ByteString data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.ErrorInfo parseFrom(
+      com.google.protobuf.ByteString data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.ErrorInfo parseFrom(byte[] data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.ErrorInfo parseFrom(
+      byte[] data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.ErrorInfo parseFrom(java.io.InputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input);
+  }
+  public static org.vdaas.vald.api.v1.rpc.ErrorInfo parseFrom(
+      java.io.InputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input, extensionRegistry);
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.ErrorInfo parseDelimitedFrom(java.io.InputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseDelimitedWithIOException(PARSER, input);
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.ErrorInfo parseDelimitedFrom(
+      java.io.InputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.ErrorInfo parseFrom(
+      com.google.protobuf.CodedInputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input);
+  }
+  public static org.vdaas.vald.api.v1.rpc.ErrorInfo parseFrom(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input, extensionRegistry);
+  }
+
+  @java.lang.Override
+  public Builder newBuilderForType() { return newBuilder(); }
+  public static Builder newBuilder() {
+    return DEFAULT_INSTANCE.toBuilder();
+  }
+  public static Builder newBuilder(org.vdaas.vald.api.v1.rpc.ErrorInfo prototype) {
+    return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+  }
+  @java.lang.Override
+  public Builder toBuilder() {
+    return this == DEFAULT_INSTANCE
+        ? new Builder() : new Builder().mergeFrom(this);
+  }
+
+  @java.lang.Override
+  protected Builder newBuilderForType(
+      com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+    Builder builder = new Builder(parent);
+    return builder;
+  }
+  /**
+   * 
+   * Describes the cause of the error with structured details.
+   *
+   * Example of an error when contacting the "pubsub.googleapis.com" API when it
+   * is not enabled:
+   *
+   *     { "reason": "API_DISABLED"
+   *       "domain": "googleapis.com"
+   *       "metadata": {
+   *         "resource": "projects/123",
+   *         "service": "pubsub.googleapis.com"
+   *       }
+   *     }
+   *
+   * This response indicates that the pubsub.googleapis.com API is not enabled.
+   *
+   * Example of an error that is returned when attempting to create a Spanner
+   * instance in a region that is out of stock:
+   *
+   *     { "reason": "STOCKOUT"
+   *       "domain": "spanner.googleapis.com",
+   *       "metadata": {
+   *         "availableRegions": "us-central1,us-east2"
+   *       }
+   *     }
+   * 

+   *
+   * Protobuf type {@code rpc.v1.ErrorInfo}
+   */
+  public static final class Builder extends
+      com.google.protobuf.GeneratedMessageV3.Builder implements
+      // @@protoc_insertion_point(builder_implements:rpc.v1.ErrorInfo)
+      org.vdaas.vald.api.v1.rpc.ErrorInfoOrBuilder {
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_ErrorInfo_descriptor;
+    }
+
+    @SuppressWarnings({"rawtypes"})
+    protected com.google.protobuf.MapField internalGetMapField(
+        int number) {
+      switch (number) {
+        case 3:
+          return internalGetMetadata();
+        default:
+          throw new RuntimeException(
+              "Invalid map field number: " + number);
+      }
+    }
+    @SuppressWarnings({"rawtypes"})
+    protected com.google.protobuf.MapField internalGetMutableMapField(
+        int number) {
+      switch (number) {
+        case 3:
+          return internalGetMutableMetadata();
+        default:
+          throw new RuntimeException(
+              "Invalid map field number: " + number);
+      }
+    }
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_ErrorInfo_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              org.vdaas.vald.api.v1.rpc.ErrorInfo.class, org.vdaas.vald.api.v1.rpc.ErrorInfo.Builder.class);
+    }
+
+    // Construct using org.vdaas.vald.api.v1.rpc.ErrorInfo.newBuilder()
+    private Builder() {
+
+    }
+
+    private Builder(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      super(parent);
+
+    }
+    @java.lang.Override
+    public Builder clear() {
+      super.clear();
+      bitField0_ = 0;
+      reason_ = "";
+      domain_ = "";
+      internalGetMutableMetadata().clear();
+      return this;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.Descriptor
+        getDescriptorForType() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_ErrorInfo_descriptor;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.ErrorInfo getDefaultInstanceForType() {
+      return org.vdaas.vald.api.v1.rpc.ErrorInfo.getDefaultInstance();
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.ErrorInfo build() {
+      org.vdaas.vald.api.v1.rpc.ErrorInfo result = buildPartial();
+      if (!result.isInitialized()) {
+        throw newUninitializedMessageException(result);
+      }
+      return result;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.ErrorInfo buildPartial() {
+      org.vdaas.vald.api.v1.rpc.ErrorInfo result = new org.vdaas.vald.api.v1.rpc.ErrorInfo(this);
+      if (bitField0_ != 0) { buildPartial0(result); }
+      onBuilt();
+      return result;
+    }
+
+    private void buildPartial0(org.vdaas.vald.api.v1.rpc.ErrorInfo result) {
+      int from_bitField0_ = bitField0_;
+      if (((from_bitField0_ & 0x00000001) != 0)) {
+        result.reason_ = reason_;
+      }
+      if (((from_bitField0_ & 0x00000002) != 0)) {
+        result.domain_ = domain_;
+      }
+      if (((from_bitField0_ & 0x00000004) != 0)) {
+        result.metadata_ = internalGetMetadata();
+        result.metadata_.makeImmutable();
+      }
+    }
+
+    @java.lang.Override
+    public Builder clone() {
+      return super.clone();
+    }
+    @java.lang.Override
+    public Builder setField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        java.lang.Object value) {
+      return super.setField(field, value);
+    }
+    @java.lang.Override
+    public Builder clearField(
+        com.google.protobuf.Descriptors.FieldDescriptor field) {
+      return super.clearField(field);
+    }
+    @java.lang.Override
+    public Builder clearOneof(
+        com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+      return super.clearOneof(oneof);
+    }
+    @java.lang.Override
+    public Builder setRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        int index, java.lang.Object value) {
+      return super.setRepeatedField(field, index, value);
+    }
+    @java.lang.Override
+    public Builder addRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        java.lang.Object value) {
+      return super.addRepeatedField(field, value);
+    }
+    @java.lang.Override
+    public Builder mergeFrom(com.google.protobuf.Message other) {
+      if (other instanceof org.vdaas.vald.api.v1.rpc.ErrorInfo) {
+        return mergeFrom((org.vdaas.vald.api.v1.rpc.ErrorInfo)other);
+      } else {
+        super.mergeFrom(other);
+        return this;
+      }
+    }
+
+    public Builder mergeFrom(org.vdaas.vald.api.v1.rpc.ErrorInfo other) {
+      if (other == org.vdaas.vald.api.v1.rpc.ErrorInfo.getDefaultInstance()) return this;
+      if (!other.getReason().isEmpty()) {
+        reason_ = other.reason_;
+        bitField0_ |= 0x00000001;
+        onChanged();
+      }
+      if (!other.getDomain().isEmpty()) {
+        domain_ = other.domain_;
+        bitField0_ |= 0x00000002;
+        onChanged();
+      }
+      internalGetMutableMetadata().mergeFrom(
+          other.internalGetMetadata());
+      bitField0_ |= 0x00000004;
+      this.mergeUnknownFields(other.getUnknownFields());
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      return true;
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      if (extensionRegistry == null) {
+        throw new java.lang.NullPointerException();
+      }
+      try {
+        boolean done = false;
+        while (!done) {
+          int tag = input.readTag();
+          switch (tag) {
+            case 0:
+              done = true;
+              break;
+            case 10: {
+              reason_ = input.readStringRequireUtf8();
+              bitField0_ |= 0x00000001;
+              break;
+            } // case 10
+            case 18: {
+              domain_ = input.readStringRequireUtf8();
+              bitField0_ |= 0x00000002;
+              break;
+            } // case 18
+            case 26: {
+              com.google.protobuf.MapEntry
+              metadata__ = input.readMessage(
+                  MetadataDefaultEntryHolder.defaultEntry.getParserForType(), extensionRegistry);
+              internalGetMutableMetadata().getMutableMap().put(
+                  metadata__.getKey(), metadata__.getValue());
+              bitField0_ |= 0x00000004;
+              break;
+            } // case 26
+            default: {
+              if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                done = true; // was an endgroup tag
+              }
+              break;
+            } // default:
+          } // switch (tag)
+        } // while (!done)
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.unwrapIOException();
+      } finally {
+        onChanged();
+      } // finally
+      return this;
+    }
+    private int bitField0_;
+
+    private java.lang.Object reason_ = "";
+    /**
+     * 
+     * The reason of the error. This is a constant value that identifies the
+     * proximate cause of the error. Error reasons are unique within a particular
+     * domain of errors. This should be at most 63 characters and match a
+     * regular expression of `[A-Z][A-Z0-9_]+[A-Z0-9]`, which represents
+     * UPPER_SNAKE_CASE.
+     * 

+     *
+     * string reason = 1;
+     * @return The reason.
+     */
+    public java.lang.String getReason() {
+      java.lang.Object ref = reason_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs =
+            (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        reason_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     * 
+     * The reason of the error. This is a constant value that identifies the
+     * proximate cause of the error. Error reasons are unique within a particular
+     * domain of errors. This should be at most 63 characters and match a
+     * regular expression of `[A-Z][A-Z0-9_]+[A-Z0-9]`, which represents
+     * UPPER_SNAKE_CASE.
+     * 

+     *
+     * string reason = 1;
+     * @return The bytes for reason.
+     */
+    public com.google.protobuf.ByteString
+        getReasonBytes() {
+      java.lang.Object ref = reason_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b = 
+            com.google.protobuf.ByteString.copyFromUtf8(
+                (java.lang.String) ref);
+        reason_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     * 
+     * The reason of the error. This is a constant value that identifies the
+     * proximate cause of the error. Error reasons are unique within a particular
+     * domain of errors. This should be at most 63 characters and match a
+     * regular expression of `[A-Z][A-Z0-9_]+[A-Z0-9]`, which represents
+     * UPPER_SNAKE_CASE.
+     * 

+     *
+     * string reason = 1;
+     * @param value The reason to set.
+     * @return This builder for chaining.
+     */
+    public Builder setReason(
+        java.lang.String value) {
+      if (value == null) { throw new NullPointerException(); }
+      reason_ = value;
+      bitField0_ |= 0x00000001;
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * The reason of the error. This is a constant value that identifies the
+     * proximate cause of the error. Error reasons are unique within a particular
+     * domain of errors. This should be at most 63 characters and match a
+     * regular expression of `[A-Z][A-Z0-9_]+[A-Z0-9]`, which represents
+     * UPPER_SNAKE_CASE.
+     * 

+     *
+     * string reason = 1;
+     * @return This builder for chaining.
+     */
+    public Builder clearReason() {
+      reason_ = getDefaultInstance().getReason();
+      bitField0_ = (bitField0_ & ~0x00000001);
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * The reason of the error. This is a constant value that identifies the
+     * proximate cause of the error. Error reasons are unique within a particular
+     * domain of errors. This should be at most 63 characters and match a
+     * regular expression of `[A-Z][A-Z0-9_]+[A-Z0-9]`, which represents
+     * UPPER_SNAKE_CASE.
+     * 

+     *
+     * string reason = 1;
+     * @param value The bytes for reason to set.
+     * @return This builder for chaining.
+     */
+    public Builder setReasonBytes(
+        com.google.protobuf.ByteString value) {
+      if (value == null) { throw new NullPointerException(); }
+      checkByteStringIsUtf8(value);
+      reason_ = value;
+      bitField0_ |= 0x00000001;
+      onChanged();
+      return this;
+    }
+
+    private java.lang.Object domain_ = "";
+    /**
+     * 
+     * The logical grouping to which the "reason" belongs. The error domain
+     * is typically the registered service name of the tool or product that
+     * generates the error. Example: "pubsub.googleapis.com". If the error is
+     * generated by some common infrastructure, the error domain must be a
+     * globally unique value that identifies the infrastructure. For Google API
+     * infrastructure, the error domain is "googleapis.com".
+     * 

+     *
+     * string domain = 2;
+     * @return The domain.
+     */
+    public java.lang.String getDomain() {
+      java.lang.Object ref = domain_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs =
+            (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        domain_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     * 
+     * The logical grouping to which the "reason" belongs. The error domain
+     * is typically the registered service name of the tool or product that
+     * generates the error. Example: "pubsub.googleapis.com". If the error is
+     * generated by some common infrastructure, the error domain must be a
+     * globally unique value that identifies the infrastructure. For Google API
+     * infrastructure, the error domain is "googleapis.com".
+     * 

+     *
+     * string domain = 2;
+     * @return The bytes for domain.
+     */
+    public com.google.protobuf.ByteString
+        getDomainBytes() {
+      java.lang.Object ref = domain_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b = 
+            com.google.protobuf.ByteString.copyFromUtf8(
+                (java.lang.String) ref);
+        domain_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     * 
+     * The logical grouping to which the "reason" belongs. The error domain
+     * is typically the registered service name of the tool or product that
+     * generates the error. Example: "pubsub.googleapis.com". If the error is
+     * generated by some common infrastructure, the error domain must be a
+     * globally unique value that identifies the infrastructure. For Google API
+     * infrastructure, the error domain is "googleapis.com".
+     * 

+     *
+     * string domain = 2;
+     * @param value The domain to set.
+     * @return This builder for chaining.
+     */
+    public Builder setDomain(
+        java.lang.String value) {
+      if (value == null) { throw new NullPointerException(); }
+      domain_ = value;
+      bitField0_ |= 0x00000002;
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * The logical grouping to which the "reason" belongs. The error domain
+     * is typically the registered service name of the tool or product that
+     * generates the error. Example: "pubsub.googleapis.com". If the error is
+     * generated by some common infrastructure, the error domain must be a
+     * globally unique value that identifies the infrastructure. For Google API
+     * infrastructure, the error domain is "googleapis.com".
+     * 

+     *
+     * string domain = 2;
+     * @return This builder for chaining.
+     */
+    public Builder clearDomain() {
+      domain_ = getDefaultInstance().getDomain();
+      bitField0_ = (bitField0_ & ~0x00000002);
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * The logical grouping to which the "reason" belongs. The error domain
+     * is typically the registered service name of the tool or product that
+     * generates the error. Example: "pubsub.googleapis.com". If the error is
+     * generated by some common infrastructure, the error domain must be a
+     * globally unique value that identifies the infrastructure. For Google API
+     * infrastructure, the error domain is "googleapis.com".
+     * 

+     *
+     * string domain = 2;
+     * @param value The bytes for domain to set.
+     * @return This builder for chaining.
+     */
+    public Builder setDomainBytes(
+        com.google.protobuf.ByteString value) {
+      if (value == null) { throw new NullPointerException(); }
+      checkByteStringIsUtf8(value);
+      domain_ = value;
+      bitField0_ |= 0x00000002;
+      onChanged();
+      return this;
+    }
+
+    private com.google.protobuf.MapField<
+        java.lang.String, java.lang.String> metadata_;
+    private com.google.protobuf.MapField
+        internalGetMetadata() {
+      if (metadata_ == null) {
+        return com.google.protobuf.MapField.emptyMapField(
+            MetadataDefaultEntryHolder.defaultEntry);
+      }
+      return metadata_;
+    }
+    private com.google.protobuf.MapField
+        internalGetMutableMetadata() {
+      if (metadata_ == null) {
+        metadata_ = com.google.protobuf.MapField.newMapField(
+            MetadataDefaultEntryHolder.defaultEntry);
+      }
+      if (!metadata_.isMutable()) {
+        metadata_ = metadata_.copy();
+      }
+      bitField0_ |= 0x00000004;
+      onChanged();
+      return metadata_;
+    }
+    public int getMetadataCount() {
+      return internalGetMetadata().getMap().size();
+    }
+    /**
+     * 
+     * Additional structured details about this error.
+     *
+     * Keys should match /[a-zA-Z0-9-_]/ and be limited to 64 characters in
+     * length. When identifying the current value of an exceeded limit, the units
+     * should be contained in the key, not the value.  For example, rather than
+     * {"instanceLimit": "100/request"}, should be returned as,
+     * {"instanceLimitPerRequest": "100"}, if the client exceeds the number of
+     * instances that can be created in a single (batch) request.
+     * 

+     *
+     * map<string, string> metadata = 3;
+     */
+    @java.lang.Override
+    public boolean containsMetadata(
+        java.lang.String key) {
+      if (key == null) { throw new NullPointerException("map key"); }
+      return internalGetMetadata().getMap().containsKey(key);
+    }
+    /**
+     * Use {@link #getMetadataMap()} instead.
+     */
+    @java.lang.Override
+    @java.lang.Deprecated
+    public java.util.Map getMetadata() {
+      return getMetadataMap();
+    }
+    /**
+     * 
+     * Additional structured details about this error.
+     *
+     * Keys should match /[a-zA-Z0-9-_]/ and be limited to 64 characters in
+     * length. When identifying the current value of an exceeded limit, the units
+     * should be contained in the key, not the value.  For example, rather than
+     * {"instanceLimit": "100/request"}, should be returned as,
+     * {"instanceLimitPerRequest": "100"}, if the client exceeds the number of
+     * instances that can be created in a single (batch) request.
+     * 

+     *
+     * map<string, string> metadata = 3;
+     */
+    @java.lang.Override
+    public java.util.Map getMetadataMap() {
+      return internalGetMetadata().getMap();
+    }
+    /**
+     * 
+     * Additional structured details about this error.
+     *
+     * Keys should match /[a-zA-Z0-9-_]/ and be limited to 64 characters in
+     * length. When identifying the current value of an exceeded limit, the units
+     * should be contained in the key, not the value.  For example, rather than
+     * {"instanceLimit": "100/request"}, should be returned as,
+     * {"instanceLimitPerRequest": "100"}, if the client exceeds the number of
+     * instances that can be created in a single (batch) request.
+     * 

+     *
+     * map<string, string> metadata = 3;
+     */
+    @java.lang.Override
+    public /* nullable */
+java.lang.String getMetadataOrDefault(
+        java.lang.String key,
+        /* nullable */
+java.lang.String defaultValue) {
+      if (key == null) { throw new NullPointerException("map key"); }
+      java.util.Map map =
+          internalGetMetadata().getMap();
+      return map.containsKey(key) ? map.get(key) : defaultValue;
+    }
+    /**
+     * 
+     * Additional structured details about this error.
+     *
+     * Keys should match /[a-zA-Z0-9-_]/ and be limited to 64 characters in
+     * length. When identifying the current value of an exceeded limit, the units
+     * should be contained in the key, not the value.  For example, rather than
+     * {"instanceLimit": "100/request"}, should be returned as,
+     * {"instanceLimitPerRequest": "100"}, if the client exceeds the number of
+     * instances that can be created in a single (batch) request.
+     * 

+     *
+     * map<string, string> metadata = 3;
+     */
+    @java.lang.Override
+    public java.lang.String getMetadataOrThrow(
+        java.lang.String key) {
+      if (key == null) { throw new NullPointerException("map key"); }
+      java.util.Map map =
+          internalGetMetadata().getMap();
+      if (!map.containsKey(key)) {
+        throw new java.lang.IllegalArgumentException();
+      }
+      return map.get(key);
+    }
+    public Builder clearMetadata() {
+      bitField0_ = (bitField0_ & ~0x00000004);
+      internalGetMutableMetadata().getMutableMap()
+          .clear();
+      return this;
+    }
+    /**
+     * 
+     * Additional structured details about this error.
+     *
+     * Keys should match /[a-zA-Z0-9-_]/ and be limited to 64 characters in
+     * length. When identifying the current value of an exceeded limit, the units
+     * should be contained in the key, not the value.  For example, rather than
+     * {"instanceLimit": "100/request"}, should be returned as,
+     * {"instanceLimitPerRequest": "100"}, if the client exceeds the number of
+     * instances that can be created in a single (batch) request.
+     * 

+     *
+     * map<string, string> metadata = 3;
+     */
+    public Builder removeMetadata(
+        java.lang.String key) {
+      if (key == null) { throw new NullPointerException("map key"); }
+      internalGetMutableMetadata().getMutableMap()
+          .remove(key);
+      return this;
+    }
+    /**
+     * Use alternate mutation accessors instead.
+     */
+    @java.lang.Deprecated
+    public java.util.Map
+        getMutableMetadata() {
+      bitField0_ |= 0x00000004;
+      return internalGetMutableMetadata().getMutableMap();
+    }
+    /**
+     * 
+     * Additional structured details about this error.
+     *
+     * Keys should match /[a-zA-Z0-9-_]/ and be limited to 64 characters in
+     * length. When identifying the current value of an exceeded limit, the units
+     * should be contained in the key, not the value.  For example, rather than
+     * {"instanceLimit": "100/request"}, should be returned as,
+     * {"instanceLimitPerRequest": "100"}, if the client exceeds the number of
+     * instances that can be created in a single (batch) request.
+     * 

+     *
+     * map<string, string> metadata = 3;
+     */
+    public Builder putMetadata(
+        java.lang.String key,
+        java.lang.String value) {
+      if (key == null) { throw new NullPointerException("map key"); }
+      if (value == null) { throw new NullPointerException("map value"); }
+      internalGetMutableMetadata().getMutableMap()
+          .put(key, value);
+      bitField0_ |= 0x00000004;
+      return this;
+    }
+    /**
+     * 
+     * Additional structured details about this error.
+     *
+     * Keys should match /[a-zA-Z0-9-_]/ and be limited to 64 characters in
+     * length. When identifying the current value of an exceeded limit, the units
+     * should be contained in the key, not the value.  For example, rather than
+     * {"instanceLimit": "100/request"}, should be returned as,
+     * {"instanceLimitPerRequest": "100"}, if the client exceeds the number of
+     * instances that can be created in a single (batch) request.
+     * 

+     *
+     * map<string, string> metadata = 3;
+     */
+    public Builder putAllMetadata(
+        java.util.Map values) {
+      internalGetMutableMetadata().getMutableMap()
+          .putAll(values);
+      bitField0_ |= 0x00000004;
+      return this;
+    }
+    @java.lang.Override
+    public final Builder setUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.setUnknownFields(unknownFields);
+    }
+
+    @java.lang.Override
+    public final Builder mergeUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.mergeUnknownFields(unknownFields);
+    }
+
+
+    // @@protoc_insertion_point(builder_scope:rpc.v1.ErrorInfo)
+  }
+
+  // @@protoc_insertion_point(class_scope:rpc.v1.ErrorInfo)
+  private static final org.vdaas.vald.api.v1.rpc.ErrorInfo DEFAULT_INSTANCE;
+  static {
+    DEFAULT_INSTANCE = new org.vdaas.vald.api.v1.rpc.ErrorInfo();
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.ErrorInfo getDefaultInstance() {
+    return DEFAULT_INSTANCE;
+  }
+
+  private static final com.google.protobuf.Parser
+      PARSER = new com.google.protobuf.AbstractParser() {
+    @java.lang.Override
+    public ErrorInfo parsePartialFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      Builder builder = newBuilder();
+      try {
+        builder.mergeFrom(input, extensionRegistry);
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(builder.buildPartial());
+      } catch (com.google.protobuf.UninitializedMessageException e) {
+        throw e.asInvalidProtocolBufferException().setUnfinishedMessage(builder.buildPartial());
+      } catch (java.io.IOException e) {
+        throw new com.google.protobuf.InvalidProtocolBufferException(e)
+            .setUnfinishedMessage(builder.buildPartial());
+      }
+      return builder.buildPartial();
+    }
+  };
+
+  public static com.google.protobuf.Parser parser() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.protobuf.Parser getParserForType() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public org.vdaas.vald.api.v1.rpc.ErrorInfo getDefaultInstanceForType() {
+    return DEFAULT_INSTANCE;
+  }
+
+}
+
diff --git a/src/main/java/org/vdaas/vald/api/v1/rpc/ErrorInfoOrBuilder.java b/src/main/java/org/vdaas/vald/api/v1/rpc/ErrorInfoOrBuilder.java
new file mode 100644
index 00000000..aee84967
--- /dev/null
+++ b/src/main/java/org/vdaas/vald/api/v1/rpc/ErrorInfoOrBuilder.java
@@ -0,0 +1,156 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: apis/proto/v1/rpc/error_details.proto
+
+package org.vdaas.vald.api.v1.rpc;
+
+public interface ErrorInfoOrBuilder extends
+    // @@protoc_insertion_point(interface_extends:rpc.v1.ErrorInfo)
+    com.google.protobuf.MessageOrBuilder {
+
+  /**
+   * 
+   * The reason of the error. This is a constant value that identifies the
+   * proximate cause of the error. Error reasons are unique within a particular
+   * domain of errors. This should be at most 63 characters and match a
+   * regular expression of `[A-Z][A-Z0-9_]+[A-Z0-9]`, which represents
+   * UPPER_SNAKE_CASE.
+   * 

+   *
+   * string reason = 1;
+   * @return The reason.
+   */
+  java.lang.String getReason();
+  /**
+   * 
+   * The reason of the error. This is a constant value that identifies the
+   * proximate cause of the error. Error reasons are unique within a particular
+   * domain of errors. This should be at most 63 characters and match a
+   * regular expression of `[A-Z][A-Z0-9_]+[A-Z0-9]`, which represents
+   * UPPER_SNAKE_CASE.
+   * 

+   *
+   * string reason = 1;
+   * @return The bytes for reason.
+   */
+  com.google.protobuf.ByteString
+      getReasonBytes();
+
+  /**
+   * 
+   * The logical grouping to which the "reason" belongs. The error domain
+   * is typically the registered service name of the tool or product that
+   * generates the error. Example: "pubsub.googleapis.com". If the error is
+   * generated by some common infrastructure, the error domain must be a
+   * globally unique value that identifies the infrastructure. For Google API
+   * infrastructure, the error domain is "googleapis.com".
+   * 

+   *
+   * string domain = 2;
+   * @return The domain.
+   */
+  java.lang.String getDomain();
+  /**
+   * 
+   * The logical grouping to which the "reason" belongs. The error domain
+   * is typically the registered service name of the tool or product that
+   * generates the error. Example: "pubsub.googleapis.com". If the error is
+   * generated by some common infrastructure, the error domain must be a
+   * globally unique value that identifies the infrastructure. For Google API
+   * infrastructure, the error domain is "googleapis.com".
+   * 

+   *
+   * string domain = 2;
+   * @return The bytes for domain.
+   */
+  com.google.protobuf.ByteString
+      getDomainBytes();
+
+  /**
+   * 
+   * Additional structured details about this error.
+   *
+   * Keys should match /[a-zA-Z0-9-_]/ and be limited to 64 characters in
+   * length. When identifying the current value of an exceeded limit, the units
+   * should be contained in the key, not the value.  For example, rather than
+   * {"instanceLimit": "100/request"}, should be returned as,
+   * {"instanceLimitPerRequest": "100"}, if the client exceeds the number of
+   * instances that can be created in a single (batch) request.
+   * 

+   *
+   * map<string, string> metadata = 3;
+   */
+  int getMetadataCount();
+  /**
+   * 
+   * Additional structured details about this error.
+   *
+   * Keys should match /[a-zA-Z0-9-_]/ and be limited to 64 characters in
+   * length. When identifying the current value of an exceeded limit, the units
+   * should be contained in the key, not the value.  For example, rather than
+   * {"instanceLimit": "100/request"}, should be returned as,
+   * {"instanceLimitPerRequest": "100"}, if the client exceeds the number of
+   * instances that can be created in a single (batch) request.
+   * 

+   *
+   * map<string, string> metadata = 3;
+   */
+  boolean containsMetadata(
+      java.lang.String key);
+  /**
+   * Use {@link #getMetadataMap()} instead.
+   */
+  @java.lang.Deprecated
+  java.util.Map
+  getMetadata();
+  /**
+   * 
+   * Additional structured details about this error.
+   *
+   * Keys should match /[a-zA-Z0-9-_]/ and be limited to 64 characters in
+   * length. When identifying the current value of an exceeded limit, the units
+   * should be contained in the key, not the value.  For example, rather than
+   * {"instanceLimit": "100/request"}, should be returned as,
+   * {"instanceLimitPerRequest": "100"}, if the client exceeds the number of
+   * instances that can be created in a single (batch) request.
+   * 

+   *
+   * map<string, string> metadata = 3;
+   */
+  java.util.Map
+  getMetadataMap();
+  /**
+   * 
+   * Additional structured details about this error.
+   *
+   * Keys should match /[a-zA-Z0-9-_]/ and be limited to 64 characters in
+   * length. When identifying the current value of an exceeded limit, the units
+   * should be contained in the key, not the value.  For example, rather than
+   * {"instanceLimit": "100/request"}, should be returned as,
+   * {"instanceLimitPerRequest": "100"}, if the client exceeds the number of
+   * instances that can be created in a single (batch) request.
+   * 

+   *
+   * map<string, string> metadata = 3;
+   */
+  /* nullable */
+java.lang.String getMetadataOrDefault(
+      java.lang.String key,
+      /* nullable */
+java.lang.String defaultValue);
+  /**
+   * 
+   * Additional structured details about this error.
+   *
+   * Keys should match /[a-zA-Z0-9-_]/ and be limited to 64 characters in
+   * length. When identifying the current value of an exceeded limit, the units
+   * should be contained in the key, not the value.  For example, rather than
+   * {"instanceLimit": "100/request"}, should be returned as,
+   * {"instanceLimitPerRequest": "100"}, if the client exceeds the number of
+   * instances that can be created in a single (batch) request.
+   * 

+   *
+   * map<string, string> metadata = 3;
+   */
+  java.lang.String getMetadataOrThrow(
+      java.lang.String key);
+}
diff --git a/src/main/java/org/vdaas/vald/api/v1/rpc/Help.java b/src/main/java/org/vdaas/vald/api/v1/rpc/Help.java
new file mode 100644
index 00000000..f97ed2d8
--- /dev/null
+++ b/src/main/java/org/vdaas/vald/api/v1/rpc/Help.java
@@ -0,0 +1,1647 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: apis/proto/v1/rpc/error_details.proto
+
+package org.vdaas.vald.api.v1.rpc;
+
+/**
+ * 
+ * Provides links to documentation or for performing an out of band action.
+ *
+ * For example, if a quota check failed with an error indicating the calling
+ * project hasn't enabled the accessed service, this can contain a URL pointing
+ * directly to the right place in the developer console to flip the bit.
+ * 

+ *
+ * Protobuf type {@code rpc.v1.Help}
+ */
+public final class Help extends
+    com.google.protobuf.GeneratedMessageV3 implements
+    // @@protoc_insertion_point(message_implements:rpc.v1.Help)
+    HelpOrBuilder {
+private static final long serialVersionUID = 0L;
+  // Use Help.newBuilder() to construct.
+  private Help(com.google.protobuf.GeneratedMessageV3.Builder builder) {
+    super(builder);
+  }
+  private Help() {
+    links_ = java.util.Collections.emptyList();
+  }
+
+  @java.lang.Override
+  @SuppressWarnings({"unused"})
+  protected java.lang.Object newInstance(
+      UnusedPrivateParameter unused) {
+    return new Help();
+  }
+
+  public static final com.google.protobuf.Descriptors.Descriptor
+      getDescriptor() {
+    return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_Help_descriptor;
+  }
+
+  @java.lang.Override
+  protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internalGetFieldAccessorTable() {
+    return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_Help_fieldAccessorTable
+        .ensureFieldAccessorsInitialized(
+            org.vdaas.vald.api.v1.rpc.Help.class, org.vdaas.vald.api.v1.rpc.Help.Builder.class);
+  }
+
+  public interface LinkOrBuilder extends
+      // @@protoc_insertion_point(interface_extends:rpc.v1.Help.Link)
+      com.google.protobuf.MessageOrBuilder {
+
+    /**
+     * 
+     * Describes what the link offers.
+     * 

+     *
+     * string description = 1;
+     * @return The description.
+     */
+    java.lang.String getDescription();
+    /**
+     * 
+     * Describes what the link offers.
+     * 

+     *
+     * string description = 1;
+     * @return The bytes for description.
+     */
+    com.google.protobuf.ByteString
+        getDescriptionBytes();
+
+    /**
+     * 
+     * The URL of the link.
+     * 

+     *
+     * string url = 2;
+     * @return The url.
+     */
+    java.lang.String getUrl();
+    /**
+     * 
+     * The URL of the link.
+     * 

+     *
+     * string url = 2;
+     * @return The bytes for url.
+     */
+    com.google.protobuf.ByteString
+        getUrlBytes();
+  }
+  /**
+   * 
+   * Describes a URL link.
+   * 

+   *
+   * Protobuf type {@code rpc.v1.Help.Link}
+   */
+  public static final class Link extends
+      com.google.protobuf.GeneratedMessageV3 implements
+      // @@protoc_insertion_point(message_implements:rpc.v1.Help.Link)
+      LinkOrBuilder {
+  private static final long serialVersionUID = 0L;
+    // Use Link.newBuilder() to construct.
+    private Link(com.google.protobuf.GeneratedMessageV3.Builder builder) {
+      super(builder);
+    }
+    private Link() {
+      description_ = "";
+      url_ = "";
+    }
+
+    @java.lang.Override
+    @SuppressWarnings({"unused"})
+    protected java.lang.Object newInstance(
+        UnusedPrivateParameter unused) {
+      return new Link();
+    }
+
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_Help_Link_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_Help_Link_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              org.vdaas.vald.api.v1.rpc.Help.Link.class, org.vdaas.vald.api.v1.rpc.Help.Link.Builder.class);
+    }
+
+    public static final int DESCRIPTION_FIELD_NUMBER = 1;
+    @SuppressWarnings("serial")
+    private volatile java.lang.Object description_ = "";
+    /**
+     * 
+     * Describes what the link offers.
+     * 

+     *
+     * string description = 1;
+     * @return The description.
+     */
+    @java.lang.Override
+    public java.lang.String getDescription() {
+      java.lang.Object ref = description_;
+      if (ref instanceof java.lang.String) {
+        return (java.lang.String) ref;
+      } else {
+        com.google.protobuf.ByteString bs = 
+            (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        description_ = s;
+        return s;
+      }
+    }
+    /**
+     * 
+     * Describes what the link offers.
+     * 

+     *
+     * string description = 1;
+     * @return The bytes for description.
+     */
+    @java.lang.Override
+    public com.google.protobuf.ByteString
+        getDescriptionBytes() {
+      java.lang.Object ref = description_;
+      if (ref instanceof java.lang.String) {
+        com.google.protobuf.ByteString b = 
+            com.google.protobuf.ByteString.copyFromUtf8(
+                (java.lang.String) ref);
+        description_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+
+    public static final int URL_FIELD_NUMBER = 2;
+    @SuppressWarnings("serial")
+    private volatile java.lang.Object url_ = "";
+    /**
+     * 
+     * The URL of the link.
+     * 

+     *
+     * string url = 2;
+     * @return The url.
+     */
+    @java.lang.Override
+    public java.lang.String getUrl() {
+      java.lang.Object ref = url_;
+      if (ref instanceof java.lang.String) {
+        return (java.lang.String) ref;
+      } else {
+        com.google.protobuf.ByteString bs = 
+            (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        url_ = s;
+        return s;
+      }
+    }
+    /**
+     * 
+     * The URL of the link.
+     * 

+     *
+     * string url = 2;
+     * @return The bytes for url.
+     */
+    @java.lang.Override
+    public com.google.protobuf.ByteString
+        getUrlBytes() {
+      java.lang.Object ref = url_;
+      if (ref instanceof java.lang.String) {
+        com.google.protobuf.ByteString b = 
+            com.google.protobuf.ByteString.copyFromUtf8(
+                (java.lang.String) ref);
+        url_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+
+    private byte memoizedIsInitialized = -1;
+    @java.lang.Override
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized == 1) return true;
+      if (isInitialized == 0) return false;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    @java.lang.Override
+    public void writeTo(com.google.protobuf.CodedOutputStream output)
+                        throws java.io.IOException {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
+        com.google.protobuf.GeneratedMessageV3.writeString(output, 1, description_);
+      }
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(url_)) {
+        com.google.protobuf.GeneratedMessageV3.writeString(output, 2, url_);
+      }
+      getUnknownFields().writeTo(output);
+    }
+
+    @java.lang.Override
+    public int getSerializedSize() {
+      int size = memoizedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
+        size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, description_);
+      }
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(url_)) {
+        size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, url_);
+      }
+      size += getUnknownFields().getSerializedSize();
+      memoizedSize = size;
+      return size;
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+       return true;
+      }
+      if (!(obj instanceof org.vdaas.vald.api.v1.rpc.Help.Link)) {
+        return super.equals(obj);
+      }
+      org.vdaas.vald.api.v1.rpc.Help.Link other = (org.vdaas.vald.api.v1.rpc.Help.Link) obj;
+
+      if (!getDescription()
+          .equals(other.getDescription())) return false;
+      if (!getUrl()
+          .equals(other.getUrl())) return false;
+      if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+      return true;
+    }
+
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      hash = (37 * hash) + DESCRIPTION_FIELD_NUMBER;
+      hash = (53 * hash) + getDescription().hashCode();
+      hash = (37 * hash) + URL_FIELD_NUMBER;
+      hash = (53 * hash) + getUrl().hashCode();
+      hash = (29 * hash) + getUnknownFields().hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static org.vdaas.vald.api.v1.rpc.Help.Link parseFrom(
+        java.nio.ByteBuffer data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.vdaas.vald.api.v1.rpc.Help.Link parseFrom(
+        java.nio.ByteBuffer data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.rpc.Help.Link parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.vdaas.vald.api.v1.rpc.Help.Link parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.rpc.Help.Link parseFrom(byte[] data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.vdaas.vald.api.v1.rpc.Help.Link parseFrom(
+        byte[] data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.rpc.Help.Link parseFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input);
+    }
+    public static org.vdaas.vald.api.v1.rpc.Help.Link parseFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input, extensionRegistry);
+    }
+
+    public static org.vdaas.vald.api.v1.rpc.Help.Link parseDelimitedFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseDelimitedWithIOException(PARSER, input);
+    }
+
+    public static org.vdaas.vald.api.v1.rpc.Help.Link parseDelimitedFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.rpc.Help.Link parseFrom(
+        com.google.protobuf.CodedInputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input);
+    }
+    public static org.vdaas.vald.api.v1.rpc.Help.Link parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() { return newBuilder(); }
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+    public static Builder newBuilder(org.vdaas.vald.api.v1.rpc.Help.Link prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE
+          ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+    /**
+     * 
+     * Describes a URL link.
+     * 

+     *
+     * Protobuf type {@code rpc.v1.Help.Link}
+     */
+    public static final class Builder extends
+        com.google.protobuf.GeneratedMessageV3.Builder implements
+        // @@protoc_insertion_point(builder_implements:rpc.v1.Help.Link)
+        org.vdaas.vald.api.v1.rpc.Help.LinkOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor
+          getDescriptor() {
+        return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_Help_Link_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_Help_Link_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                org.vdaas.vald.api.v1.rpc.Help.Link.class, org.vdaas.vald.api.v1.rpc.Help.Link.Builder.class);
+      }
+
+      // Construct using org.vdaas.vald.api.v1.rpc.Help.Link.newBuilder()
+      private Builder() {
+
+      }
+
+      private Builder(
+          com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+        super(parent);
+
+      }
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        bitField0_ = 0;
+        description_ = "";
+        url_ = "";
+        return this;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor
+          getDescriptorForType() {
+        return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_Help_Link_descriptor;
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.rpc.Help.Link getDefaultInstanceForType() {
+        return org.vdaas.vald.api.v1.rpc.Help.Link.getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.rpc.Help.Link build() {
+        org.vdaas.vald.api.v1.rpc.Help.Link result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.rpc.Help.Link buildPartial() {
+        org.vdaas.vald.api.v1.rpc.Help.Link result = new org.vdaas.vald.api.v1.rpc.Help.Link(this);
+        if (bitField0_ != 0) { buildPartial0(result); }
+        onBuilt();
+        return result;
+      }
+
+      private void buildPartial0(org.vdaas.vald.api.v1.rpc.Help.Link result) {
+        int from_bitField0_ = bitField0_;
+        if (((from_bitField0_ & 0x00000001) != 0)) {
+          result.description_ = description_;
+        }
+        if (((from_bitField0_ & 0x00000002) != 0)) {
+          result.url_ = url_;
+        }
+      }
+
+      @java.lang.Override
+      public Builder clone() {
+        return super.clone();
+      }
+      @java.lang.Override
+      public Builder setField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          java.lang.Object value) {
+        return super.setField(field, value);
+      }
+      @java.lang.Override
+      public Builder clearField(
+          com.google.protobuf.Descriptors.FieldDescriptor field) {
+        return super.clearField(field);
+      }
+      @java.lang.Override
+      public Builder clearOneof(
+          com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+        return super.clearOneof(oneof);
+      }
+      @java.lang.Override
+      public Builder setRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          int index, java.lang.Object value) {
+        return super.setRepeatedField(field, index, value);
+      }
+      @java.lang.Override
+      public Builder addRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          java.lang.Object value) {
+        return super.addRepeatedField(field, value);
+      }
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof org.vdaas.vald.api.v1.rpc.Help.Link) {
+          return mergeFrom((org.vdaas.vald.api.v1.rpc.Help.Link)other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(org.vdaas.vald.api.v1.rpc.Help.Link other) {
+        if (other == org.vdaas.vald.api.v1.rpc.Help.Link.getDefaultInstance()) return this;
+        if (!other.getDescription().isEmpty()) {
+          description_ = other.description_;
+          bitField0_ |= 0x00000001;
+          onChanged();
+        }
+        if (!other.getUrl().isEmpty()) {
+          url_ = other.url_;
+          bitField0_ |= 0x00000002;
+          onChanged();
+        }
+        this.mergeUnknownFields(other.getUnknownFields());
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        if (extensionRegistry == null) {
+          throw new java.lang.NullPointerException();
+        }
+        try {
+          boolean done = false;
+          while (!done) {
+            int tag = input.readTag();
+            switch (tag) {
+              case 0:
+                done = true;
+                break;
+              case 10: {
+                description_ = input.readStringRequireUtf8();
+                bitField0_ |= 0x00000001;
+                break;
+              } // case 10
+              case 18: {
+                url_ = input.readStringRequireUtf8();
+                bitField0_ |= 0x00000002;
+                break;
+              } // case 18
+              default: {
+                if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                  done = true; // was an endgroup tag
+                }
+                break;
+              } // default:
+            } // switch (tag)
+          } // while (!done)
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          throw e.unwrapIOException();
+        } finally {
+          onChanged();
+        } // finally
+        return this;
+      }
+      private int bitField0_;
+
+      private java.lang.Object description_ = "";
+      /**
+       * 
+       * Describes what the link offers.
+       * 

+       *
+       * string description = 1;
+       * @return The description.
+       */
+      public java.lang.String getDescription() {
+        java.lang.Object ref = description_;
+        if (!(ref instanceof java.lang.String)) {
+          com.google.protobuf.ByteString bs =
+              (com.google.protobuf.ByteString) ref;
+          java.lang.String s = bs.toStringUtf8();
+          description_ = s;
+          return s;
+        } else {
+          return (java.lang.String) ref;
+        }
+      }
+      /**
+       * 
+       * Describes what the link offers.
+       * 

+       *
+       * string description = 1;
+       * @return The bytes for description.
+       */
+      public com.google.protobuf.ByteString
+          getDescriptionBytes() {
+        java.lang.Object ref = description_;
+        if (ref instanceof String) {
+          com.google.protobuf.ByteString b = 
+              com.google.protobuf.ByteString.copyFromUtf8(
+                  (java.lang.String) ref);
+          description_ = b;
+          return b;
+        } else {
+          return (com.google.protobuf.ByteString) ref;
+        }
+      }
+      /**
+       * 
+       * Describes what the link offers.
+       * 

+       *
+       * string description = 1;
+       * @param value The description to set.
+       * @return This builder for chaining.
+       */
+      public Builder setDescription(
+          java.lang.String value) {
+        if (value == null) { throw new NullPointerException(); }
+        description_ = value;
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+      /**
+       * 
+       * Describes what the link offers.
+       * 

+       *
+       * string description = 1;
+       * @return This builder for chaining.
+       */
+      public Builder clearDescription() {
+        description_ = getDefaultInstance().getDescription();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        onChanged();
+        return this;
+      }
+      /**
+       * 
+       * Describes what the link offers.
+       * 

+       *
+       * string description = 1;
+       * @param value The bytes for description to set.
+       * @return This builder for chaining.
+       */
+      public Builder setDescriptionBytes(
+          com.google.protobuf.ByteString value) {
+        if (value == null) { throw new NullPointerException(); }
+        checkByteStringIsUtf8(value);
+        description_ = value;
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+
+      private java.lang.Object url_ = "";
+      /**
+       * 
+       * The URL of the link.
+       * 

+       *
+       * string url = 2;
+       * @return The url.
+       */
+      public java.lang.String getUrl() {
+        java.lang.Object ref = url_;
+        if (!(ref instanceof java.lang.String)) {
+          com.google.protobuf.ByteString bs =
+              (com.google.protobuf.ByteString) ref;
+          java.lang.String s = bs.toStringUtf8();
+          url_ = s;
+          return s;
+        } else {
+          return (java.lang.String) ref;
+        }
+      }
+      /**
+       * 
+       * The URL of the link.
+       * 

+       *
+       * string url = 2;
+       * @return The bytes for url.
+       */
+      public com.google.protobuf.ByteString
+          getUrlBytes() {
+        java.lang.Object ref = url_;
+        if (ref instanceof String) {
+          com.google.protobuf.ByteString b = 
+              com.google.protobuf.ByteString.copyFromUtf8(
+                  (java.lang.String) ref);
+          url_ = b;
+          return b;
+        } else {
+          return (com.google.protobuf.ByteString) ref;
+        }
+      }
+      /**
+       * 
+       * The URL of the link.
+       * 

+       *
+       * string url = 2;
+       * @param value The url to set.
+       * @return This builder for chaining.
+       */
+      public Builder setUrl(
+          java.lang.String value) {
+        if (value == null) { throw new NullPointerException(); }
+        url_ = value;
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return this;
+      }
+      /**
+       * 
+       * The URL of the link.
+       * 

+       *
+       * string url = 2;
+       * @return This builder for chaining.
+       */
+      public Builder clearUrl() {
+        url_ = getDefaultInstance().getUrl();
+        bitField0_ = (bitField0_ & ~0x00000002);
+        onChanged();
+        return this;
+      }
+      /**
+       * 
+       * The URL of the link.
+       * 

+       *
+       * string url = 2;
+       * @param value The bytes for url to set.
+       * @return This builder for chaining.
+       */
+      public Builder setUrlBytes(
+          com.google.protobuf.ByteString value) {
+        if (value == null) { throw new NullPointerException(); }
+        checkByteStringIsUtf8(value);
+        url_ = value;
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return this;
+      }
+      @java.lang.Override
+      public final Builder setUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.setUnknownFields(unknownFields);
+      }
+
+      @java.lang.Override
+      public final Builder mergeUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.mergeUnknownFields(unknownFields);
+      }
+
+
+      // @@protoc_insertion_point(builder_scope:rpc.v1.Help.Link)
+    }
+
+    // @@protoc_insertion_point(class_scope:rpc.v1.Help.Link)
+    private static final org.vdaas.vald.api.v1.rpc.Help.Link DEFAULT_INSTANCE;
+    static {
+      DEFAULT_INSTANCE = new org.vdaas.vald.api.v1.rpc.Help.Link();
+    }
+
+    public static org.vdaas.vald.api.v1.rpc.Help.Link getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser
+        PARSER = new com.google.protobuf.AbstractParser() {
+      @java.lang.Override
+      public Link parsePartialFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        Builder builder = newBuilder();
+        try {
+          builder.mergeFrom(input, extensionRegistry);
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          throw e.setUnfinishedMessage(builder.buildPartial());
+        } catch (com.google.protobuf.UninitializedMessageException e) {
+          throw e.asInvalidProtocolBufferException().setUnfinishedMessage(builder.buildPartial());
+        } catch (java.io.IOException e) {
+          throw new com.google.protobuf.InvalidProtocolBufferException(e)
+              .setUnfinishedMessage(builder.buildPartial());
+        }
+        return builder.buildPartial();
+      }
+    };
+
+    public static com.google.protobuf.Parser parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.Help.Link getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+
+  }
+
+  public static final int LINKS_FIELD_NUMBER = 1;
+  @SuppressWarnings("serial")
+  private java.util.List links_;
+  /**
+   * 
+   * URL(s) pointing to additional information on handling the current error.
+   * 

+   *
+   * repeated .rpc.v1.Help.Link links = 1;
+   */
+  @java.lang.Override
+  public java.util.List getLinksList() {
+    return links_;
+  }
+  /**
+   * 
+   * URL(s) pointing to additional information on handling the current error.
+   * 

+   *
+   * repeated .rpc.v1.Help.Link links = 1;
+   */
+  @java.lang.Override
+  public java.util.List 
+      getLinksOrBuilderList() {
+    return links_;
+  }
+  /**
+   * 
+   * URL(s) pointing to additional information on handling the current error.
+   * 

+   *
+   * repeated .rpc.v1.Help.Link links = 1;
+   */
+  @java.lang.Override
+  public int getLinksCount() {
+    return links_.size();
+  }
+  /**
+   * 
+   * URL(s) pointing to additional information on handling the current error.
+   * 

+   *
+   * repeated .rpc.v1.Help.Link links = 1;
+   */
+  @java.lang.Override
+  public org.vdaas.vald.api.v1.rpc.Help.Link getLinks(int index) {
+    return links_.get(index);
+  }
+  /**
+   * 
+   * URL(s) pointing to additional information on handling the current error.
+   * 

+   *
+   * repeated .rpc.v1.Help.Link links = 1;
+   */
+  @java.lang.Override
+  public org.vdaas.vald.api.v1.rpc.Help.LinkOrBuilder getLinksOrBuilder(
+      int index) {
+    return links_.get(index);
+  }
+
+  private byte memoizedIsInitialized = -1;
+  @java.lang.Override
+  public final boolean isInitialized() {
+    byte isInitialized = memoizedIsInitialized;
+    if (isInitialized == 1) return true;
+    if (isInitialized == 0) return false;
+
+    memoizedIsInitialized = 1;
+    return true;
+  }
+
+  @java.lang.Override
+  public void writeTo(com.google.protobuf.CodedOutputStream output)
+                      throws java.io.IOException {
+    for (int i = 0; i < links_.size(); i++) {
+      output.writeMessage(1, links_.get(i));
+    }
+    getUnknownFields().writeTo(output);
+  }
+
+  @java.lang.Override
+  public int getSerializedSize() {
+    int size = memoizedSize;
+    if (size != -1) return size;
+
+    size = 0;
+    for (int i = 0; i < links_.size(); i++) {
+      size += com.google.protobuf.CodedOutputStream
+        .computeMessageSize(1, links_.get(i));
+    }
+    size += getUnknownFields().getSerializedSize();
+    memoizedSize = size;
+    return size;
+  }
+
+  @java.lang.Override
+  public boolean equals(final java.lang.Object obj) {
+    if (obj == this) {
+     return true;
+    }
+    if (!(obj instanceof org.vdaas.vald.api.v1.rpc.Help)) {
+      return super.equals(obj);
+    }
+    org.vdaas.vald.api.v1.rpc.Help other = (org.vdaas.vald.api.v1.rpc.Help) obj;
+
+    if (!getLinksList()
+        .equals(other.getLinksList())) return false;
+    if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+    return true;
+  }
+
+  @java.lang.Override
+  public int hashCode() {
+    if (memoizedHashCode != 0) {
+      return memoizedHashCode;
+    }
+    int hash = 41;
+    hash = (19 * hash) + getDescriptor().hashCode();
+    if (getLinksCount() > 0) {
+      hash = (37 * hash) + LINKS_FIELD_NUMBER;
+      hash = (53 * hash) + getLinksList().hashCode();
+    }
+    hash = (29 * hash) + getUnknownFields().hashCode();
+    memoizedHashCode = hash;
+    return hash;
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.Help parseFrom(
+      java.nio.ByteBuffer data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.Help parseFrom(
+      java.nio.ByteBuffer data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.Help parseFrom(
+      com.google.protobuf.ByteString data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.Help parseFrom(
+      com.google.protobuf.ByteString data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.Help parseFrom(byte[] data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.Help parseFrom(
+      byte[] data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.Help parseFrom(java.io.InputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input);
+  }
+  public static org.vdaas.vald.api.v1.rpc.Help parseFrom(
+      java.io.InputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input, extensionRegistry);
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.Help parseDelimitedFrom(java.io.InputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseDelimitedWithIOException(PARSER, input);
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.Help parseDelimitedFrom(
+      java.io.InputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.Help parseFrom(
+      com.google.protobuf.CodedInputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input);
+  }
+  public static org.vdaas.vald.api.v1.rpc.Help parseFrom(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input, extensionRegistry);
+  }
+
+  @java.lang.Override
+  public Builder newBuilderForType() { return newBuilder(); }
+  public static Builder newBuilder() {
+    return DEFAULT_INSTANCE.toBuilder();
+  }
+  public static Builder newBuilder(org.vdaas.vald.api.v1.rpc.Help prototype) {
+    return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+  }
+  @java.lang.Override
+  public Builder toBuilder() {
+    return this == DEFAULT_INSTANCE
+        ? new Builder() : new Builder().mergeFrom(this);
+  }
+
+  @java.lang.Override
+  protected Builder newBuilderForType(
+      com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+    Builder builder = new Builder(parent);
+    return builder;
+  }
+  /**
+   * 
+   * Provides links to documentation or for performing an out of band action.
+   *
+   * For example, if a quota check failed with an error indicating the calling
+   * project hasn't enabled the accessed service, this can contain a URL pointing
+   * directly to the right place in the developer console to flip the bit.
+   * 

+   *
+   * Protobuf type {@code rpc.v1.Help}
+   */
+  public static final class Builder extends
+      com.google.protobuf.GeneratedMessageV3.Builder implements
+      // @@protoc_insertion_point(builder_implements:rpc.v1.Help)
+      org.vdaas.vald.api.v1.rpc.HelpOrBuilder {
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_Help_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_Help_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              org.vdaas.vald.api.v1.rpc.Help.class, org.vdaas.vald.api.v1.rpc.Help.Builder.class);
+    }
+
+    // Construct using org.vdaas.vald.api.v1.rpc.Help.newBuilder()
+    private Builder() {
+
+    }
+
+    private Builder(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      super(parent);
+
+    }
+    @java.lang.Override
+    public Builder clear() {
+      super.clear();
+      bitField0_ = 0;
+      if (linksBuilder_ == null) {
+        links_ = java.util.Collections.emptyList();
+      } else {
+        links_ = null;
+        linksBuilder_.clear();
+      }
+      bitField0_ = (bitField0_ & ~0x00000001);
+      return this;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.Descriptor
+        getDescriptorForType() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_Help_descriptor;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.Help getDefaultInstanceForType() {
+      return org.vdaas.vald.api.v1.rpc.Help.getDefaultInstance();
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.Help build() {
+      org.vdaas.vald.api.v1.rpc.Help result = buildPartial();
+      if (!result.isInitialized()) {
+        throw newUninitializedMessageException(result);
+      }
+      return result;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.Help buildPartial() {
+      org.vdaas.vald.api.v1.rpc.Help result = new org.vdaas.vald.api.v1.rpc.Help(this);
+      buildPartialRepeatedFields(result);
+      if (bitField0_ != 0) { buildPartial0(result); }
+      onBuilt();
+      return result;
+    }
+
+    private void buildPartialRepeatedFields(org.vdaas.vald.api.v1.rpc.Help result) {
+      if (linksBuilder_ == null) {
+        if (((bitField0_ & 0x00000001) != 0)) {
+          links_ = java.util.Collections.unmodifiableList(links_);
+          bitField0_ = (bitField0_ & ~0x00000001);
+        }
+        result.links_ = links_;
+      } else {
+        result.links_ = linksBuilder_.build();
+      }
+    }
+
+    private void buildPartial0(org.vdaas.vald.api.v1.rpc.Help result) {
+      int from_bitField0_ = bitField0_;
+    }
+
+    @java.lang.Override
+    public Builder clone() {
+      return super.clone();
+    }
+    @java.lang.Override
+    public Builder setField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        java.lang.Object value) {
+      return super.setField(field, value);
+    }
+    @java.lang.Override
+    public Builder clearField(
+        com.google.protobuf.Descriptors.FieldDescriptor field) {
+      return super.clearField(field);
+    }
+    @java.lang.Override
+    public Builder clearOneof(
+        com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+      return super.clearOneof(oneof);
+    }
+    @java.lang.Override
+    public Builder setRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        int index, java.lang.Object value) {
+      return super.setRepeatedField(field, index, value);
+    }
+    @java.lang.Override
+    public Builder addRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        java.lang.Object value) {
+      return super.addRepeatedField(field, value);
+    }
+    @java.lang.Override
+    public Builder mergeFrom(com.google.protobuf.Message other) {
+      if (other instanceof org.vdaas.vald.api.v1.rpc.Help) {
+        return mergeFrom((org.vdaas.vald.api.v1.rpc.Help)other);
+      } else {
+        super.mergeFrom(other);
+        return this;
+      }
+    }
+
+    public Builder mergeFrom(org.vdaas.vald.api.v1.rpc.Help other) {
+      if (other == org.vdaas.vald.api.v1.rpc.Help.getDefaultInstance()) return this;
+      if (linksBuilder_ == null) {
+        if (!other.links_.isEmpty()) {
+          if (links_.isEmpty()) {
+            links_ = other.links_;
+            bitField0_ = (bitField0_ & ~0x00000001);
+          } else {
+            ensureLinksIsMutable();
+            links_.addAll(other.links_);
+          }
+          onChanged();
+        }
+      } else {
+        if (!other.links_.isEmpty()) {
+          if (linksBuilder_.isEmpty()) {
+            linksBuilder_.dispose();
+            linksBuilder_ = null;
+            links_ = other.links_;
+            bitField0_ = (bitField0_ & ~0x00000001);
+            linksBuilder_ = 
+              com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders ?
+                 getLinksFieldBuilder() : null;
+          } else {
+            linksBuilder_.addAllMessages(other.links_);
+          }
+        }
+      }
+      this.mergeUnknownFields(other.getUnknownFields());
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      return true;
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      if (extensionRegistry == null) {
+        throw new java.lang.NullPointerException();
+      }
+      try {
+        boolean done = false;
+        while (!done) {
+          int tag = input.readTag();
+          switch (tag) {
+            case 0:
+              done = true;
+              break;
+            case 10: {
+              org.vdaas.vald.api.v1.rpc.Help.Link m =
+                  input.readMessage(
+                      org.vdaas.vald.api.v1.rpc.Help.Link.parser(),
+                      extensionRegistry);
+              if (linksBuilder_ == null) {
+                ensureLinksIsMutable();
+                links_.add(m);
+              } else {
+                linksBuilder_.addMessage(m);
+              }
+              break;
+            } // case 10
+            default: {
+              if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                done = true; // was an endgroup tag
+              }
+              break;
+            } // default:
+          } // switch (tag)
+        } // while (!done)
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.unwrapIOException();
+      } finally {
+        onChanged();
+      } // finally
+      return this;
+    }
+    private int bitField0_;
+
+    private java.util.List links_ =
+      java.util.Collections.emptyList();
+    private void ensureLinksIsMutable() {
+      if (!((bitField0_ & 0x00000001) != 0)) {
+        links_ = new java.util.ArrayList(links_);
+        bitField0_ |= 0x00000001;
+       }
+    }
+
+    private com.google.protobuf.RepeatedFieldBuilderV3<
+        org.vdaas.vald.api.v1.rpc.Help.Link, org.vdaas.vald.api.v1.rpc.Help.Link.Builder, org.vdaas.vald.api.v1.rpc.Help.LinkOrBuilder> linksBuilder_;
+
+    /**
+     * 
+     * URL(s) pointing to additional information on handling the current error.
+     * 

+     *
+     * repeated .rpc.v1.Help.Link links = 1;
+     */
+    public java.util.List getLinksList() {
+      if (linksBuilder_ == null) {
+        return java.util.Collections.unmodifiableList(links_);
+      } else {
+        return linksBuilder_.getMessageList();
+      }
+    }
+    /**
+     * 
+     * URL(s) pointing to additional information on handling the current error.
+     * 

+     *
+     * repeated .rpc.v1.Help.Link links = 1;
+     */
+    public int getLinksCount() {
+      if (linksBuilder_ == null) {
+        return links_.size();
+      } else {
+        return linksBuilder_.getCount();
+      }
+    }
+    /**
+     * 
+     * URL(s) pointing to additional information on handling the current error.
+     * 

+     *
+     * repeated .rpc.v1.Help.Link links = 1;
+     */
+    public org.vdaas.vald.api.v1.rpc.Help.Link getLinks(int index) {
+      if (linksBuilder_ == null) {
+        return links_.get(index);
+      } else {
+        return linksBuilder_.getMessage(index);
+      }
+    }
+    /**
+     * 
+     * URL(s) pointing to additional information on handling the current error.
+     * 

+     *
+     * repeated .rpc.v1.Help.Link links = 1;
+     */
+    public Builder setLinks(
+        int index, org.vdaas.vald.api.v1.rpc.Help.Link value) {
+      if (linksBuilder_ == null) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        ensureLinksIsMutable();
+        links_.set(index, value);
+        onChanged();
+      } else {
+        linksBuilder_.setMessage(index, value);
+      }
+      return this;
+    }
+    /**
+     * 
+     * URL(s) pointing to additional information on handling the current error.
+     * 

+     *
+     * repeated .rpc.v1.Help.Link links = 1;
+     */
+    public Builder setLinks(
+        int index, org.vdaas.vald.api.v1.rpc.Help.Link.Builder builderForValue) {
+      if (linksBuilder_ == null) {
+        ensureLinksIsMutable();
+        links_.set(index, builderForValue.build());
+        onChanged();
+      } else {
+        linksBuilder_.setMessage(index, builderForValue.build());
+      }
+      return this;
+    }
+    /**
+     * 
+     * URL(s) pointing to additional information on handling the current error.
+     * 

+     *
+     * repeated .rpc.v1.Help.Link links = 1;
+     */
+    public Builder addLinks(org.vdaas.vald.api.v1.rpc.Help.Link value) {
+      if (linksBuilder_ == null) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        ensureLinksIsMutable();
+        links_.add(value);
+        onChanged();
+      } else {
+        linksBuilder_.addMessage(value);
+      }
+      return this;
+    }
+    /**
+     * 
+     * URL(s) pointing to additional information on handling the current error.
+     * 

+     *
+     * repeated .rpc.v1.Help.Link links = 1;
+     */
+    public Builder addLinks(
+        int index, org.vdaas.vald.api.v1.rpc.Help.Link value) {
+      if (linksBuilder_ == null) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        ensureLinksIsMutable();
+        links_.add(index, value);
+        onChanged();
+      } else {
+        linksBuilder_.addMessage(index, value);
+      }
+      return this;
+    }
+    /**
+     * 
+     * URL(s) pointing to additional information on handling the current error.
+     * 

+     *
+     * repeated .rpc.v1.Help.Link links = 1;
+     */
+    public Builder addLinks(
+        org.vdaas.vald.api.v1.rpc.Help.Link.Builder builderForValue) {
+      if (linksBuilder_ == null) {
+        ensureLinksIsMutable();
+        links_.add(builderForValue.build());
+        onChanged();
+      } else {
+        linksBuilder_.addMessage(builderForValue.build());
+      }
+      return this;
+    }
+    /**
+     * 
+     * URL(s) pointing to additional information on handling the current error.
+     * 

+     *
+     * repeated .rpc.v1.Help.Link links = 1;
+     */
+    public Builder addLinks(
+        int index, org.vdaas.vald.api.v1.rpc.Help.Link.Builder builderForValue) {
+      if (linksBuilder_ == null) {
+        ensureLinksIsMutable();
+        links_.add(index, builderForValue.build());
+        onChanged();
+      } else {
+        linksBuilder_.addMessage(index, builderForValue.build());
+      }
+      return this;
+    }
+    /**
+     * 
+     * URL(s) pointing to additional information on handling the current error.
+     * 

+     *
+     * repeated .rpc.v1.Help.Link links = 1;
+     */
+    public Builder addAllLinks(
+        java.lang.Iterable values) {
+      if (linksBuilder_ == null) {
+        ensureLinksIsMutable();
+        com.google.protobuf.AbstractMessageLite.Builder.addAll(
+            values, links_);
+        onChanged();
+      } else {
+        linksBuilder_.addAllMessages(values);
+      }
+      return this;
+    }
+    /**
+     * 
+     * URL(s) pointing to additional information on handling the current error.
+     * 

+     *
+     * repeated .rpc.v1.Help.Link links = 1;
+     */
+    public Builder clearLinks() {
+      if (linksBuilder_ == null) {
+        links_ = java.util.Collections.emptyList();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        onChanged();
+      } else {
+        linksBuilder_.clear();
+      }
+      return this;
+    }
+    /**
+     * 
+     * URL(s) pointing to additional information on handling the current error.
+     * 

+     *
+     * repeated .rpc.v1.Help.Link links = 1;
+     */
+    public Builder removeLinks(int index) {
+      if (linksBuilder_ == null) {
+        ensureLinksIsMutable();
+        links_.remove(index);
+        onChanged();
+      } else {
+        linksBuilder_.remove(index);
+      }
+      return this;
+    }
+    /**
+     * 
+     * URL(s) pointing to additional information on handling the current error.
+     * 

+     *
+     * repeated .rpc.v1.Help.Link links = 1;
+     */
+    public org.vdaas.vald.api.v1.rpc.Help.Link.Builder getLinksBuilder(
+        int index) {
+      return getLinksFieldBuilder().getBuilder(index);
+    }
+    /**
+     * 
+     * URL(s) pointing to additional information on handling the current error.
+     * 

+     *
+     * repeated .rpc.v1.Help.Link links = 1;
+     */
+    public org.vdaas.vald.api.v1.rpc.Help.LinkOrBuilder getLinksOrBuilder(
+        int index) {
+      if (linksBuilder_ == null) {
+        return links_.get(index);  } else {
+        return linksBuilder_.getMessageOrBuilder(index);
+      }
+    }
+    /**
+     * 
+     * URL(s) pointing to additional information on handling the current error.
+     * 

+     *
+     * repeated .rpc.v1.Help.Link links = 1;
+     */
+    public java.util.List 
+         getLinksOrBuilderList() {
+      if (linksBuilder_ != null) {
+        return linksBuilder_.getMessageOrBuilderList();
+      } else {
+        return java.util.Collections.unmodifiableList(links_);
+      }
+    }
+    /**
+     * 
+     * URL(s) pointing to additional information on handling the current error.
+     * 

+     *
+     * repeated .rpc.v1.Help.Link links = 1;
+     */
+    public org.vdaas.vald.api.v1.rpc.Help.Link.Builder addLinksBuilder() {
+      return getLinksFieldBuilder().addBuilder(
+          org.vdaas.vald.api.v1.rpc.Help.Link.getDefaultInstance());
+    }
+    /**
+     * 
+     * URL(s) pointing to additional information on handling the current error.
+     * 

+     *
+     * repeated .rpc.v1.Help.Link links = 1;
+     */
+    public org.vdaas.vald.api.v1.rpc.Help.Link.Builder addLinksBuilder(
+        int index) {
+      return getLinksFieldBuilder().addBuilder(
+          index, org.vdaas.vald.api.v1.rpc.Help.Link.getDefaultInstance());
+    }
+    /**
+     * 
+     * URL(s) pointing to additional information on handling the current error.
+     * 

+     *
+     * repeated .rpc.v1.Help.Link links = 1;
+     */
+    public java.util.List 
+         getLinksBuilderList() {
+      return getLinksFieldBuilder().getBuilderList();
+    }
+    private com.google.protobuf.RepeatedFieldBuilderV3<
+        org.vdaas.vald.api.v1.rpc.Help.Link, org.vdaas.vald.api.v1.rpc.Help.Link.Builder, org.vdaas.vald.api.v1.rpc.Help.LinkOrBuilder> 
+        getLinksFieldBuilder() {
+      if (linksBuilder_ == null) {
+        linksBuilder_ = new com.google.protobuf.RepeatedFieldBuilderV3<
+            org.vdaas.vald.api.v1.rpc.Help.Link, org.vdaas.vald.api.v1.rpc.Help.Link.Builder, org.vdaas.vald.api.v1.rpc.Help.LinkOrBuilder>(
+                links_,
+                ((bitField0_ & 0x00000001) != 0),
+                getParentForChildren(),
+                isClean());
+        links_ = null;
+      }
+      return linksBuilder_;
+    }
+    @java.lang.Override
+    public final Builder setUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.setUnknownFields(unknownFields);
+    }
+
+    @java.lang.Override
+    public final Builder mergeUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.mergeUnknownFields(unknownFields);
+    }
+
+
+    // @@protoc_insertion_point(builder_scope:rpc.v1.Help)
+  }
+
+  // @@protoc_insertion_point(class_scope:rpc.v1.Help)
+  private static final org.vdaas.vald.api.v1.rpc.Help DEFAULT_INSTANCE;
+  static {
+    DEFAULT_INSTANCE = new org.vdaas.vald.api.v1.rpc.Help();
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.Help getDefaultInstance() {
+    return DEFAULT_INSTANCE;
+  }
+
+  private static final com.google.protobuf.Parser
+      PARSER = new com.google.protobuf.AbstractParser() {
+    @java.lang.Override
+    public Help parsePartialFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      Builder builder = newBuilder();
+      try {
+        builder.mergeFrom(input, extensionRegistry);
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(builder.buildPartial());
+      } catch (com.google.protobuf.UninitializedMessageException e) {
+        throw e.asInvalidProtocolBufferException().setUnfinishedMessage(builder.buildPartial());
+      } catch (java.io.IOException e) {
+        throw new com.google.protobuf.InvalidProtocolBufferException(e)
+            .setUnfinishedMessage(builder.buildPartial());
+      }
+      return builder.buildPartial();
+    }
+  };
+
+  public static com.google.protobuf.Parser parser() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.protobuf.Parser getParserForType() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public org.vdaas.vald.api.v1.rpc.Help getDefaultInstanceForType() {
+    return DEFAULT_INSTANCE;
+  }
+
+}
+
diff --git a/src/main/java/org/vdaas/vald/api/v1/rpc/HelpOrBuilder.java b/src/main/java/org/vdaas/vald/api/v1/rpc/HelpOrBuilder.java
new file mode 100644
index 00000000..ce1dcbc4
--- /dev/null
+++ b/src/main/java/org/vdaas/vald/api/v1/rpc/HelpOrBuilder.java
@@ -0,0 +1,53 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: apis/proto/v1/rpc/error_details.proto
+
+package org.vdaas.vald.api.v1.rpc;
+
+public interface HelpOrBuilder extends
+    // @@protoc_insertion_point(interface_extends:rpc.v1.Help)
+    com.google.protobuf.MessageOrBuilder {
+
+  /**
+   * 
+   * URL(s) pointing to additional information on handling the current error.
+   * 

+   *
+   * repeated .rpc.v1.Help.Link links = 1;
+   */
+  java.util.List 
+      getLinksList();
+  /**
+   * 
+   * URL(s) pointing to additional information on handling the current error.
+   * 

+   *
+   * repeated .rpc.v1.Help.Link links = 1;
+   */
+  org.vdaas.vald.api.v1.rpc.Help.Link getLinks(int index);
+  /**
+   * 
+   * URL(s) pointing to additional information on handling the current error.
+   * 

+   *
+   * repeated .rpc.v1.Help.Link links = 1;
+   */
+  int getLinksCount();
+  /**
+   * 
+   * URL(s) pointing to additional information on handling the current error.
+   * 

+   *
+   * repeated .rpc.v1.Help.Link links = 1;
+   */
+  java.util.List 
+      getLinksOrBuilderList();
+  /**
+   * 
+   * URL(s) pointing to additional information on handling the current error.
+   * 

+   *
+   * repeated .rpc.v1.Help.Link links = 1;
+   */
+  org.vdaas.vald.api.v1.rpc.Help.LinkOrBuilder getLinksOrBuilder(
+      int index);
+}
diff --git a/src/main/java/org/vdaas/vald/api/v1/rpc/LocalizedMessage.java b/src/main/java/org/vdaas/vald/api/v1/rpc/LocalizedMessage.java
new file mode 100644
index 00000000..f41b900e
--- /dev/null
+++ b/src/main/java/org/vdaas/vald/api/v1/rpc/LocalizedMessage.java
@@ -0,0 +1,757 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: apis/proto/v1/rpc/error_details.proto
+
+package org.vdaas.vald.api.v1.rpc;
+
+/**
+ * 
+ * Provides a localized error message that is safe to return to the user
+ * which can be attached to an RPC error.
+ * 

+ *
+ * Protobuf type {@code rpc.v1.LocalizedMessage}
+ */
+public final class LocalizedMessage extends
+    com.google.protobuf.GeneratedMessageV3 implements
+    // @@protoc_insertion_point(message_implements:rpc.v1.LocalizedMessage)
+    LocalizedMessageOrBuilder {
+private static final long serialVersionUID = 0L;
+  // Use LocalizedMessage.newBuilder() to construct.
+  private LocalizedMessage(com.google.protobuf.GeneratedMessageV3.Builder builder) {
+    super(builder);
+  }
+  private LocalizedMessage() {
+    locale_ = "";
+    message_ = "";
+  }
+
+  @java.lang.Override
+  @SuppressWarnings({"unused"})
+  protected java.lang.Object newInstance(
+      UnusedPrivateParameter unused) {
+    return new LocalizedMessage();
+  }
+
+  public static final com.google.protobuf.Descriptors.Descriptor
+      getDescriptor() {
+    return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_LocalizedMessage_descriptor;
+  }
+
+  @java.lang.Override
+  protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internalGetFieldAccessorTable() {
+    return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_LocalizedMessage_fieldAccessorTable
+        .ensureFieldAccessorsInitialized(
+            org.vdaas.vald.api.v1.rpc.LocalizedMessage.class, org.vdaas.vald.api.v1.rpc.LocalizedMessage.Builder.class);
+  }
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+  /**
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+   * The locale used following the specification defined at
+   * https://www.rfc-editor.org/rfc/bcp/bcp47.txt.
+   * Examples are: "en-US", "fr-CH", "es-MX"
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+   * @return The locale.
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+  public java.lang.String getLocale() {
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+      java.lang.String s = bs.toStringUtf8();
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+  /**
+   * 
+   * The locale used following the specification defined at
+   * https://www.rfc-editor.org/rfc/bcp/bcp47.txt.
+   * Examples are: "en-US", "fr-CH", "es-MX"
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+  public com.google.protobuf.ByteString
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+  /**
+   * 
+   * The localized error message in the above locale.
+   * 

+   *
+   * string message = 2;
+   * @return The message.
+   */
+  @java.lang.Override
+  public java.lang.String getMessage() {
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+    } else {
+      com.google.protobuf.ByteString bs = 
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+      java.lang.String s = bs.toStringUtf8();
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+   * The localized error message in the above locale.
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+   * @return The bytes for message.
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+  public com.google.protobuf.ByteString
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+      com.google.protobuf.ByteString b = 
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+    byte isInitialized = memoizedIsInitialized;
+    if (isInitialized == 1) return true;
+    if (isInitialized == 0) return false;
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+    memoizedIsInitialized = 1;
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+  @java.lang.Override
+  public void writeTo(com.google.protobuf.CodedOutputStream output)
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+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(locale_)) {
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+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(message_)) {
+      com.google.protobuf.GeneratedMessageV3.writeString(output, 2, message_);
+    }
+    getUnknownFields().writeTo(output);
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+
+  @java.lang.Override
+  public int getSerializedSize() {
+    int size = memoizedSize;
+    if (size != -1) return size;
+
+    size = 0;
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(locale_)) {
+      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, locale_);
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+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(message_)) {
+      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, message_);
+    }
+    size += getUnknownFields().getSerializedSize();
+    memoizedSize = size;
+    return size;
+  }
+
+  @java.lang.Override
+  public boolean equals(final java.lang.Object obj) {
+    if (obj == this) {
+     return true;
+    }
+    if (!(obj instanceof org.vdaas.vald.api.v1.rpc.LocalizedMessage)) {
+      return super.equals(obj);
+    }
+    org.vdaas.vald.api.v1.rpc.LocalizedMessage other = (org.vdaas.vald.api.v1.rpc.LocalizedMessage) obj;
+
+    if (!getLocale()
+        .equals(other.getLocale())) return false;
+    if (!getMessage()
+        .equals(other.getMessage())) return false;
+    if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+    return true;
+  }
+
+  @java.lang.Override
+  public int hashCode() {
+    if (memoizedHashCode != 0) {
+      return memoizedHashCode;
+    }
+    int hash = 41;
+    hash = (19 * hash) + getDescriptor().hashCode();
+    hash = (37 * hash) + LOCALE_FIELD_NUMBER;
+    hash = (53 * hash) + getLocale().hashCode();
+    hash = (37 * hash) + MESSAGE_FIELD_NUMBER;
+    hash = (53 * hash) + getMessage().hashCode();
+    hash = (29 * hash) + getUnknownFields().hashCode();
+    memoizedHashCode = hash;
+    return hash;
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.LocalizedMessage parseFrom(
+      java.nio.ByteBuffer data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
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+  public static org.vdaas.vald.api.v1.rpc.LocalizedMessage parseFrom(
+      java.nio.ByteBuffer data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.LocalizedMessage parseFrom(
+      com.google.protobuf.ByteString data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.LocalizedMessage parseFrom(
+      com.google.protobuf.ByteString data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.LocalizedMessage parseFrom(byte[] data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.LocalizedMessage parseFrom(
+      byte[] data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.LocalizedMessage parseFrom(java.io.InputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input);
+  }
+  public static org.vdaas.vald.api.v1.rpc.LocalizedMessage parseFrom(
+      java.io.InputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input, extensionRegistry);
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.LocalizedMessage parseDelimitedFrom(java.io.InputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseDelimitedWithIOException(PARSER, input);
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.LocalizedMessage parseDelimitedFrom(
+      java.io.InputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.LocalizedMessage parseFrom(
+      com.google.protobuf.CodedInputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input);
+  }
+  public static org.vdaas.vald.api.v1.rpc.LocalizedMessage parseFrom(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input, extensionRegistry);
+  }
+
+  @java.lang.Override
+  public Builder newBuilderForType() { return newBuilder(); }
+  public static Builder newBuilder() {
+    return DEFAULT_INSTANCE.toBuilder();
+  }
+  public static Builder newBuilder(org.vdaas.vald.api.v1.rpc.LocalizedMessage prototype) {
+    return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+  }
+  @java.lang.Override
+  public Builder toBuilder() {
+    return this == DEFAULT_INSTANCE
+        ? new Builder() : new Builder().mergeFrom(this);
+  }
+
+  @java.lang.Override
+  protected Builder newBuilderForType(
+      com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+    Builder builder = new Builder(parent);
+    return builder;
+  }
+  /**
+   * 
+   * Provides a localized error message that is safe to return to the user
+   * which can be attached to an RPC error.
+   * 

+   *
+   * Protobuf type {@code rpc.v1.LocalizedMessage}
+   */
+  public static final class Builder extends
+      com.google.protobuf.GeneratedMessageV3.Builder implements
+      // @@protoc_insertion_point(builder_implements:rpc.v1.LocalizedMessage)
+      org.vdaas.vald.api.v1.rpc.LocalizedMessageOrBuilder {
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_LocalizedMessage_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_LocalizedMessage_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              org.vdaas.vald.api.v1.rpc.LocalizedMessage.class, org.vdaas.vald.api.v1.rpc.LocalizedMessage.Builder.class);
+    }
+
+    // Construct using org.vdaas.vald.api.v1.rpc.LocalizedMessage.newBuilder()
+    private Builder() {
+
+    }
+
+    private Builder(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      super(parent);
+
+    }
+    @java.lang.Override
+    public Builder clear() {
+      super.clear();
+      bitField0_ = 0;
+      locale_ = "";
+      message_ = "";
+      return this;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.Descriptor
+        getDescriptorForType() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_LocalizedMessage_descriptor;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.LocalizedMessage getDefaultInstanceForType() {
+      return org.vdaas.vald.api.v1.rpc.LocalizedMessage.getDefaultInstance();
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.LocalizedMessage build() {
+      org.vdaas.vald.api.v1.rpc.LocalizedMessage result = buildPartial();
+      if (!result.isInitialized()) {
+        throw newUninitializedMessageException(result);
+      }
+      return result;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.LocalizedMessage buildPartial() {
+      org.vdaas.vald.api.v1.rpc.LocalizedMessage result = new org.vdaas.vald.api.v1.rpc.LocalizedMessage(this);
+      if (bitField0_ != 0) { buildPartial0(result); }
+      onBuilt();
+      return result;
+    }
+
+    private void buildPartial0(org.vdaas.vald.api.v1.rpc.LocalizedMessage result) {
+      int from_bitField0_ = bitField0_;
+      if (((from_bitField0_ & 0x00000001) != 0)) {
+        result.locale_ = locale_;
+      }
+      if (((from_bitField0_ & 0x00000002) != 0)) {
+        result.message_ = message_;
+      }
+    }
+
+    @java.lang.Override
+    public Builder clone() {
+      return super.clone();
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+    @java.lang.Override
+    public Builder setField(
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+        java.lang.Object value) {
+      return super.setField(field, value);
+    }
+    @java.lang.Override
+    public Builder clearField(
+        com.google.protobuf.Descriptors.FieldDescriptor field) {
+      return super.clearField(field);
+    }
+    @java.lang.Override
+    public Builder clearOneof(
+        com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+      return super.clearOneof(oneof);
+    }
+    @java.lang.Override
+    public Builder setRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        int index, java.lang.Object value) {
+      return super.setRepeatedField(field, index, value);
+    }
+    @java.lang.Override
+    public Builder addRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        java.lang.Object value) {
+      return super.addRepeatedField(field, value);
+    }
+    @java.lang.Override
+    public Builder mergeFrom(com.google.protobuf.Message other) {
+      if (other instanceof org.vdaas.vald.api.v1.rpc.LocalizedMessage) {
+        return mergeFrom((org.vdaas.vald.api.v1.rpc.LocalizedMessage)other);
+      } else {
+        super.mergeFrom(other);
+        return this;
+      }
+    }
+
+    public Builder mergeFrom(org.vdaas.vald.api.v1.rpc.LocalizedMessage other) {
+      if (other == org.vdaas.vald.api.v1.rpc.LocalizedMessage.getDefaultInstance()) return this;
+      if (!other.getLocale().isEmpty()) {
+        locale_ = other.locale_;
+        bitField0_ |= 0x00000001;
+        onChanged();
+      }
+      if (!other.getMessage().isEmpty()) {
+        message_ = other.message_;
+        bitField0_ |= 0x00000002;
+        onChanged();
+      }
+      this.mergeUnknownFields(other.getUnknownFields());
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      return true;
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      if (extensionRegistry == null) {
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+              done = true;
+              break;
+            case 10: {
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+              bitField0_ |= 0x00000001;
+              break;
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+            case 18: {
+              message_ = input.readStringRequireUtf8();
+              bitField0_ |= 0x00000002;
+              break;
+            } // case 18
+            default: {
+              if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                done = true; // was an endgroup tag
+              }
+              break;
+            } // default:
+          } // switch (tag)
+        } // while (!done)
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.unwrapIOException();
+      } finally {
+        onChanged();
+      } // finally
+      return this;
+    }
+    private int bitField0_;
+
+    private java.lang.Object locale_ = "";
+    /**
+     * 
+     * The locale used following the specification defined at
+     * https://www.rfc-editor.org/rfc/bcp/bcp47.txt.
+     * Examples are: "en-US", "fr-CH", "es-MX"
+     * 

+     *
+     * string locale = 1;
+     * @return The locale.
+     */
+    public java.lang.String getLocale() {
+      java.lang.Object ref = locale_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs =
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+        java.lang.String s = bs.toStringUtf8();
+        locale_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
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+    /**
+     * 
+     * The locale used following the specification defined at
+     * https://www.rfc-editor.org/rfc/bcp/bcp47.txt.
+     * Examples are: "en-US", "fr-CH", "es-MX"
+     * 

+     *
+     * string locale = 1;
+     * @return The bytes for locale.
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+    public com.google.protobuf.ByteString
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+      java.lang.Object ref = locale_;
+      if (ref instanceof String) {
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+    }
+    /**
+     * 
+     * The locale used following the specification defined at
+     * https://www.rfc-editor.org/rfc/bcp/bcp47.txt.
+     * Examples are: "en-US", "fr-CH", "es-MX"
+     * 

+     *
+     * string locale = 1;
+     * @param value The locale to set.
+     * @return This builder for chaining.
+     */
+    public Builder setLocale(
+        java.lang.String value) {
+      if (value == null) { throw new NullPointerException(); }
+      locale_ = value;
+      bitField0_ |= 0x00000001;
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * The locale used following the specification defined at
+     * https://www.rfc-editor.org/rfc/bcp/bcp47.txt.
+     * Examples are: "en-US", "fr-CH", "es-MX"
+     * 

+     *
+     * string locale = 1;
+     * @return This builder for chaining.
+     */
+    public Builder clearLocale() {
+      locale_ = getDefaultInstance().getLocale();
+      bitField0_ = (bitField0_ & ~0x00000001);
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * The locale used following the specification defined at
+     * https://www.rfc-editor.org/rfc/bcp/bcp47.txt.
+     * Examples are: "en-US", "fr-CH", "es-MX"
+     * 

+     *
+     * string locale = 1;
+     * @param value The bytes for locale to set.
+     * @return This builder for chaining.
+     */
+    public Builder setLocaleBytes(
+        com.google.protobuf.ByteString value) {
+      if (value == null) { throw new NullPointerException(); }
+      checkByteStringIsUtf8(value);
+      locale_ = value;
+      bitField0_ |= 0x00000001;
+      onChanged();
+      return this;
+    }
+
+    private java.lang.Object message_ = "";
+    /**
+     * 
+     * The localized error message in the above locale.
+     * 

+     *
+     * string message = 2;
+     * @return The message.
+     */
+    public java.lang.String getMessage() {
+      java.lang.Object ref = message_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs =
+            (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        message_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     * 
+     * The localized error message in the above locale.
+     * 

+     *
+     * string message = 2;
+     * @return The bytes for message.
+     */
+    public com.google.protobuf.ByteString
+        getMessageBytes() {
+      java.lang.Object ref = message_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b = 
+            com.google.protobuf.ByteString.copyFromUtf8(
+                (java.lang.String) ref);
+        message_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     * 
+     * The localized error message in the above locale.
+     * 

+     *
+     * string message = 2;
+     * @param value The message to set.
+     * @return This builder for chaining.
+     */
+    public Builder setMessage(
+        java.lang.String value) {
+      if (value == null) { throw new NullPointerException(); }
+      message_ = value;
+      bitField0_ |= 0x00000002;
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * The localized error message in the above locale.
+     * 

+     *
+     * string message = 2;
+     * @return This builder for chaining.
+     */
+    public Builder clearMessage() {
+      message_ = getDefaultInstance().getMessage();
+      bitField0_ = (bitField0_ & ~0x00000002);
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * The localized error message in the above locale.
+     * 

+     *
+     * string message = 2;
+     * @param value The bytes for message to set.
+     * @return This builder for chaining.
+     */
+    public Builder setMessageBytes(
+        com.google.protobuf.ByteString value) {
+      if (value == null) { throw new NullPointerException(); }
+      checkByteStringIsUtf8(value);
+      message_ = value;
+      bitField0_ |= 0x00000002;
+      onChanged();
+      return this;
+    }
+    @java.lang.Override
+    public final Builder setUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.setUnknownFields(unknownFields);
+    }
+
+    @java.lang.Override
+    public final Builder mergeUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.mergeUnknownFields(unknownFields);
+    }
+
+
+    // @@protoc_insertion_point(builder_scope:rpc.v1.LocalizedMessage)
+  }
+
+  // @@protoc_insertion_point(class_scope:rpc.v1.LocalizedMessage)
+  private static final org.vdaas.vald.api.v1.rpc.LocalizedMessage DEFAULT_INSTANCE;
+  static {
+    DEFAULT_INSTANCE = new org.vdaas.vald.api.v1.rpc.LocalizedMessage();
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.LocalizedMessage getDefaultInstance() {
+    return DEFAULT_INSTANCE;
+  }
+
+  private static final com.google.protobuf.Parser
+      PARSER = new com.google.protobuf.AbstractParser() {
+    @java.lang.Override
+    public LocalizedMessage parsePartialFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      Builder builder = newBuilder();
+      try {
+        builder.mergeFrom(input, extensionRegistry);
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(builder.buildPartial());
+      } catch (com.google.protobuf.UninitializedMessageException e) {
+        throw e.asInvalidProtocolBufferException().setUnfinishedMessage(builder.buildPartial());
+      } catch (java.io.IOException e) {
+        throw new com.google.protobuf.InvalidProtocolBufferException(e)
+            .setUnfinishedMessage(builder.buildPartial());
+      }
+      return builder.buildPartial();
+    }
+  };
+
+  public static com.google.protobuf.Parser parser() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.protobuf.Parser getParserForType() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public org.vdaas.vald.api.v1.rpc.LocalizedMessage getDefaultInstanceForType() {
+    return DEFAULT_INSTANCE;
+  }
+
+}
+
diff --git a/src/main/java/org/vdaas/vald/api/v1/rpc/LocalizedMessageOrBuilder.java b/src/main/java/org/vdaas/vald/api/v1/rpc/LocalizedMessageOrBuilder.java
new file mode 100644
index 00000000..e2f83ed1
--- /dev/null
+++ b/src/main/java/org/vdaas/vald/api/v1/rpc/LocalizedMessageOrBuilder.java
@@ -0,0 +1,53 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: apis/proto/v1/rpc/error_details.proto
+
+package org.vdaas.vald.api.v1.rpc;
+
+public interface LocalizedMessageOrBuilder extends
+    // @@protoc_insertion_point(interface_extends:rpc.v1.LocalizedMessage)
+    com.google.protobuf.MessageOrBuilder {
+
+  /**
+   * 
+   * The locale used following the specification defined at
+   * https://www.rfc-editor.org/rfc/bcp/bcp47.txt.
+   * Examples are: "en-US", "fr-CH", "es-MX"
+   * 

+   *
+   * string locale = 1;
+   * @return The locale.
+   */
+  java.lang.String getLocale();
+  /**
+   * 
+   * The locale used following the specification defined at
+   * https://www.rfc-editor.org/rfc/bcp/bcp47.txt.
+   * Examples are: "en-US", "fr-CH", "es-MX"
+   * 

+   *
+   * string locale = 1;
+   * @return The bytes for locale.
+   */
+  com.google.protobuf.ByteString
+      getLocaleBytes();
+
+  /**
+   * 
+   * The localized error message in the above locale.
+   * 

+   *
+   * string message = 2;
+   * @return The message.
+   */
+  java.lang.String getMessage();
+  /**
+   * 
+   * The localized error message in the above locale.
+   * 

+   *
+   * string message = 2;
+   * @return The bytes for message.
+   */
+  com.google.protobuf.ByteString
+      getMessageBytes();
+}
diff --git a/src/main/java/org/vdaas/vald/api/v1/rpc/PreconditionFailure.java b/src/main/java/org/vdaas/vald/api/v1/rpc/PreconditionFailure.java
new file mode 100644
index 00000000..dfa30fed
--- /dev/null
+++ b/src/main/java/org/vdaas/vald/api/v1/rpc/PreconditionFailure.java
@@ -0,0 +1,1894 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: apis/proto/v1/rpc/error_details.proto
+
+package org.vdaas.vald.api.v1.rpc;
+
+/**
+ * 
+ * Describes what preconditions have failed.
+ *
+ * For example, if an RPC failed because it required the Terms of Service to be
+ * acknowledged, it could list the terms of service violation in the
+ * PreconditionFailure message.
+ * 

+ *
+ * Protobuf type {@code rpc.v1.PreconditionFailure}
+ */
+public final class PreconditionFailure extends
+    com.google.protobuf.GeneratedMessageV3 implements
+    // @@protoc_insertion_point(message_implements:rpc.v1.PreconditionFailure)
+    PreconditionFailureOrBuilder {
+private static final long serialVersionUID = 0L;
+  // Use PreconditionFailure.newBuilder() to construct.
+  private PreconditionFailure(com.google.protobuf.GeneratedMessageV3.Builder builder) {
+    super(builder);
+  }
+  private PreconditionFailure() {
+    violations_ = java.util.Collections.emptyList();
+  }
+
+  @java.lang.Override
+  @SuppressWarnings({"unused"})
+  protected java.lang.Object newInstance(
+      UnusedPrivateParameter unused) {
+    return new PreconditionFailure();
+  }
+
+  public static final com.google.protobuf.Descriptors.Descriptor
+      getDescriptor() {
+    return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_PreconditionFailure_descriptor;
+  }
+
+  @java.lang.Override
+  protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internalGetFieldAccessorTable() {
+    return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_PreconditionFailure_fieldAccessorTable
+        .ensureFieldAccessorsInitialized(
+            org.vdaas.vald.api.v1.rpc.PreconditionFailure.class, org.vdaas.vald.api.v1.rpc.PreconditionFailure.Builder.class);
+  }
+
+  public interface ViolationOrBuilder extends
+      // @@protoc_insertion_point(interface_extends:rpc.v1.PreconditionFailure.Violation)
+      com.google.protobuf.MessageOrBuilder {
+
+    /**
+     * 
+     * The type of PreconditionFailure. We recommend using a service-specific
+     * enum type to define the supported precondition violation subjects. For
+     * example, "TOS" for "Terms of Service violation".
+     * 

+     *
+     * string type = 1;
+     * @return The type.
+     */
+    java.lang.String getType();
+    /**
+     * 
+     * The type of PreconditionFailure. We recommend using a service-specific
+     * enum type to define the supported precondition violation subjects. For
+     * example, "TOS" for "Terms of Service violation".
+     * 

+     *
+     * string type = 1;
+     * @return The bytes for type.
+     */
+    com.google.protobuf.ByteString
+        getTypeBytes();
+
+    /**
+     * 
+     * The subject, relative to the type, that failed.
+     * For example, "google.com/cloud" relative to the "TOS" type would indicate
+     * which terms of service is being referenced.
+     * 

+     *
+     * string subject = 2;
+     * @return The subject.
+     */
+    java.lang.String getSubject();
+    /**
+     * 
+     * The subject, relative to the type, that failed.
+     * For example, "google.com/cloud" relative to the "TOS" type would indicate
+     * which terms of service is being referenced.
+     * 

+     *
+     * string subject = 2;
+     * @return The bytes for subject.
+     */
+    com.google.protobuf.ByteString
+        getSubjectBytes();
+
+    /**
+     * 
+     * A description of how the precondition failed. Developers can use this
+     * description to understand how to fix the failure.
+     *
+     * For example: "Terms of service not accepted".
+     * 

+     *
+     * string description = 3;
+     * @return The description.
+     */
+    java.lang.String getDescription();
+    /**
+     * 
+     * A description of how the precondition failed. Developers can use this
+     * description to understand how to fix the failure.
+     *
+     * For example: "Terms of service not accepted".
+     * 

+     *
+     * string description = 3;
+     * @return The bytes for description.
+     */
+    com.google.protobuf.ByteString
+        getDescriptionBytes();
+  }
+  /**
+   * 
+   * A message type used to describe a single precondition failure.
+   * 

+   *
+   * Protobuf type {@code rpc.v1.PreconditionFailure.Violation}
+   */
+  public static final class Violation extends
+      com.google.protobuf.GeneratedMessageV3 implements
+      // @@protoc_insertion_point(message_implements:rpc.v1.PreconditionFailure.Violation)
+      ViolationOrBuilder {
+  private static final long serialVersionUID = 0L;
+    // Use Violation.newBuilder() to construct.
+    private Violation(com.google.protobuf.GeneratedMessageV3.Builder builder) {
+      super(builder);
+    }
+    private Violation() {
+      type_ = "";
+      subject_ = "";
+      description_ = "";
+    }
+
+    @java.lang.Override
+    @SuppressWarnings({"unused"})
+    protected java.lang.Object newInstance(
+        UnusedPrivateParameter unused) {
+      return new Violation();
+    }
+
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_PreconditionFailure_Violation_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_PreconditionFailure_Violation_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation.class, org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation.Builder.class);
+    }
+
+    public static final int TYPE_FIELD_NUMBER = 1;
+    @SuppressWarnings("serial")
+    private volatile java.lang.Object type_ = "";
+    /**
+     * 
+     * The type of PreconditionFailure. We recommend using a service-specific
+     * enum type to define the supported precondition violation subjects. For
+     * example, "TOS" for "Terms of Service violation".
+     * 

+     *
+     * string type = 1;
+     * @return The type.
+     */
+    @java.lang.Override
+    public java.lang.String getType() {
+      java.lang.Object ref = type_;
+      if (ref instanceof java.lang.String) {
+        return (java.lang.String) ref;
+      } else {
+        com.google.protobuf.ByteString bs = 
+            (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        type_ = s;
+        return s;
+      }
+    }
+    /**
+     * 
+     * The type of PreconditionFailure. We recommend using a service-specific
+     * enum type to define the supported precondition violation subjects. For
+     * example, "TOS" for "Terms of Service violation".
+     * 

+     *
+     * string type = 1;
+     * @return The bytes for type.
+     */
+    @java.lang.Override
+    public com.google.protobuf.ByteString
+        getTypeBytes() {
+      java.lang.Object ref = type_;
+      if (ref instanceof java.lang.String) {
+        com.google.protobuf.ByteString b = 
+            com.google.protobuf.ByteString.copyFromUtf8(
+                (java.lang.String) ref);
+        type_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+
+    public static final int SUBJECT_FIELD_NUMBER = 2;
+    @SuppressWarnings("serial")
+    private volatile java.lang.Object subject_ = "";
+    /**
+     * 
+     * The subject, relative to the type, that failed.
+     * For example, "google.com/cloud" relative to the "TOS" type would indicate
+     * which terms of service is being referenced.
+     * 

+     *
+     * string subject = 2;
+     * @return The subject.
+     */
+    @java.lang.Override
+    public java.lang.String getSubject() {
+      java.lang.Object ref = subject_;
+      if (ref instanceof java.lang.String) {
+        return (java.lang.String) ref;
+      } else {
+        com.google.protobuf.ByteString bs = 
+            (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        subject_ = s;
+        return s;
+      }
+    }
+    /**
+     * 
+     * The subject, relative to the type, that failed.
+     * For example, "google.com/cloud" relative to the "TOS" type would indicate
+     * which terms of service is being referenced.
+     * 

+     *
+     * string subject = 2;
+     * @return The bytes for subject.
+     */
+    @java.lang.Override
+    public com.google.protobuf.ByteString
+        getSubjectBytes() {
+      java.lang.Object ref = subject_;
+      if (ref instanceof java.lang.String) {
+        com.google.protobuf.ByteString b = 
+            com.google.protobuf.ByteString.copyFromUtf8(
+                (java.lang.String) ref);
+        subject_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+
+    public static final int DESCRIPTION_FIELD_NUMBER = 3;
+    @SuppressWarnings("serial")
+    private volatile java.lang.Object description_ = "";
+    /**
+     * 
+     * A description of how the precondition failed. Developers can use this
+     * description to understand how to fix the failure.
+     *
+     * For example: "Terms of service not accepted".
+     * 

+     *
+     * string description = 3;
+     * @return The description.
+     */
+    @java.lang.Override
+    public java.lang.String getDescription() {
+      java.lang.Object ref = description_;
+      if (ref instanceof java.lang.String) {
+        return (java.lang.String) ref;
+      } else {
+        com.google.protobuf.ByteString bs = 
+            (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        description_ = s;
+        return s;
+      }
+    }
+    /**
+     * 
+     * A description of how the precondition failed. Developers can use this
+     * description to understand how to fix the failure.
+     *
+     * For example: "Terms of service not accepted".
+     * 

+     *
+     * string description = 3;
+     * @return The bytes for description.
+     */
+    @java.lang.Override
+    public com.google.protobuf.ByteString
+        getDescriptionBytes() {
+      java.lang.Object ref = description_;
+      if (ref instanceof java.lang.String) {
+        com.google.protobuf.ByteString b = 
+            com.google.protobuf.ByteString.copyFromUtf8(
+                (java.lang.String) ref);
+        description_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+
+    private byte memoizedIsInitialized = -1;
+    @java.lang.Override
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized == 1) return true;
+      if (isInitialized == 0) return false;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    @java.lang.Override
+    public void writeTo(com.google.protobuf.CodedOutputStream output)
+                        throws java.io.IOException {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(type_)) {
+        com.google.protobuf.GeneratedMessageV3.writeString(output, 1, type_);
+      }
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(subject_)) {
+        com.google.protobuf.GeneratedMessageV3.writeString(output, 2, subject_);
+      }
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
+        com.google.protobuf.GeneratedMessageV3.writeString(output, 3, description_);
+      }
+      getUnknownFields().writeTo(output);
+    }
+
+    @java.lang.Override
+    public int getSerializedSize() {
+      int size = memoizedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(type_)) {
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+      size += getUnknownFields().getSerializedSize();
+      memoizedSize = size;
+      return size;
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+       return true;
+      }
+      if (!(obj instanceof org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation)) {
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+
+      if (!getType()
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+      if (!getSubject()
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+      if (!getDescription()
+          .equals(other.getDescription())) return false;
+      if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+      return true;
+    }
+
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      hash = (37 * hash) + TYPE_FIELD_NUMBER;
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+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation parseFrom(
+        java.nio.ByteBuffer data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation parseFrom(
+        java.nio.ByteBuffer data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation parseFrom(byte[] data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation parseFrom(
+        byte[] data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation parseFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input);
+    }
+    public static org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation parseFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input, extensionRegistry);
+    }
+
+    public static org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation parseDelimitedFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseDelimitedWithIOException(PARSER, input);
+    }
+
+    public static org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation parseDelimitedFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation parseFrom(
+        com.google.protobuf.CodedInputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input);
+    }
+    public static org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() { return newBuilder(); }
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+    public static Builder newBuilder(org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE
+          ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+    /**
+     * 
+     * A message type used to describe a single precondition failure.
+     * 

+     *
+     * Protobuf type {@code rpc.v1.PreconditionFailure.Violation}
+     */
+    public static final class Builder extends
+        com.google.protobuf.GeneratedMessageV3.Builder implements
+        // @@protoc_insertion_point(builder_implements:rpc.v1.PreconditionFailure.Violation)
+        org.vdaas.vald.api.v1.rpc.PreconditionFailure.ViolationOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor
+          getDescriptor() {
+        return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_PreconditionFailure_Violation_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_PreconditionFailure_Violation_fieldAccessorTable
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+      }
+
+      // Construct using org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation.newBuilder()
+      private Builder() {
+
+      }
+
+      private Builder(
+          com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+        super(parent);
+
+      }
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        bitField0_ = 0;
+        type_ = "";
+        subject_ = "";
+        description_ = "";
+        return this;
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+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor
+          getDescriptorForType() {
+        return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_PreconditionFailure_Violation_descriptor;
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation getDefaultInstanceForType() {
+        return org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation.getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation build() {
+        org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation buildPartial() {
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+        if (bitField0_ != 0) { buildPartial0(result); }
+        onBuilt();
+        return result;
+      }
+
+      private void buildPartial0(org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation result) {
+        int from_bitField0_ = bitField0_;
+        if (((from_bitField0_ & 0x00000001) != 0)) {
+          result.type_ = type_;
+        }
+        if (((from_bitField0_ & 0x00000002) != 0)) {
+          result.subject_ = subject_;
+        }
+        if (((from_bitField0_ & 0x00000004) != 0)) {
+          result.description_ = description_;
+        }
+      }
+
+      @java.lang.Override
+      public Builder clone() {
+        return super.clone();
+      }
+      @java.lang.Override
+      public Builder setField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          java.lang.Object value) {
+        return super.setField(field, value);
+      }
+      @java.lang.Override
+      public Builder clearField(
+          com.google.protobuf.Descriptors.FieldDescriptor field) {
+        return super.clearField(field);
+      }
+      @java.lang.Override
+      public Builder clearOneof(
+          com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+        return super.clearOneof(oneof);
+      }
+      @java.lang.Override
+      public Builder setRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          int index, java.lang.Object value) {
+        return super.setRepeatedField(field, index, value);
+      }
+      @java.lang.Override
+      public Builder addRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          java.lang.Object value) {
+        return super.addRepeatedField(field, value);
+      }
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation) {
+          return mergeFrom((org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation)other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation other) {
+        if (other == org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation.getDefaultInstance()) return this;
+        if (!other.getType().isEmpty()) {
+          type_ = other.type_;
+          bitField0_ |= 0x00000001;
+          onChanged();
+        }
+        if (!other.getSubject().isEmpty()) {
+          subject_ = other.subject_;
+          bitField0_ |= 0x00000002;
+          onChanged();
+        }
+        if (!other.getDescription().isEmpty()) {
+          description_ = other.description_;
+          bitField0_ |= 0x00000004;
+          onChanged();
+        }
+        this.mergeUnknownFields(other.getUnknownFields());
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        if (extensionRegistry == null) {
+          throw new java.lang.NullPointerException();
+        }
+        try {
+          boolean done = false;
+          while (!done) {
+            int tag = input.readTag();
+            switch (tag) {
+              case 0:
+                done = true;
+                break;
+              case 10: {
+                type_ = input.readStringRequireUtf8();
+                bitField0_ |= 0x00000001;
+                break;
+              } // case 10
+              case 18: {
+                subject_ = input.readStringRequireUtf8();
+                bitField0_ |= 0x00000002;
+                break;
+              } // case 18
+              case 26: {
+                description_ = input.readStringRequireUtf8();
+                bitField0_ |= 0x00000004;
+                break;
+              } // case 26
+              default: {
+                if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                  done = true; // was an endgroup tag
+                }
+                break;
+              } // default:
+            } // switch (tag)
+          } // while (!done)
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          throw e.unwrapIOException();
+        } finally {
+          onChanged();
+        } // finally
+        return this;
+      }
+      private int bitField0_;
+
+      private java.lang.Object type_ = "";
+      /**
+       * 
+       * The type of PreconditionFailure. We recommend using a service-specific
+       * enum type to define the supported precondition violation subjects. For
+       * example, "TOS" for "Terms of Service violation".
+       * 

+       *
+       * string type = 1;
+       * @return The type.
+       */
+      public java.lang.String getType() {
+        java.lang.Object ref = type_;
+        if (!(ref instanceof java.lang.String)) {
+          com.google.protobuf.ByteString bs =
+              (com.google.protobuf.ByteString) ref;
+          java.lang.String s = bs.toStringUtf8();
+          type_ = s;
+          return s;
+        } else {
+          return (java.lang.String) ref;
+        }
+      }
+      /**
+       * 
+       * The type of PreconditionFailure. We recommend using a service-specific
+       * enum type to define the supported precondition violation subjects. For
+       * example, "TOS" for "Terms of Service violation".
+       * 

+       *
+       * string type = 1;
+       * @return The bytes for type.
+       */
+      public com.google.protobuf.ByteString
+          getTypeBytes() {
+        java.lang.Object ref = type_;
+        if (ref instanceof String) {
+          com.google.protobuf.ByteString b = 
+              com.google.protobuf.ByteString.copyFromUtf8(
+                  (java.lang.String) ref);
+          type_ = b;
+          return b;
+        } else {
+          return (com.google.protobuf.ByteString) ref;
+        }
+      }
+      /**
+       * 
+       * The type of PreconditionFailure. We recommend using a service-specific
+       * enum type to define the supported precondition violation subjects. For
+       * example, "TOS" for "Terms of Service violation".
+       * 

+       *
+       * string type = 1;
+       * @param value The type to set.
+       * @return This builder for chaining.
+       */
+      public Builder setType(
+          java.lang.String value) {
+        if (value == null) { throw new NullPointerException(); }
+        type_ = value;
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+      /**
+       * 
+       * The type of PreconditionFailure. We recommend using a service-specific
+       * enum type to define the supported precondition violation subjects. For
+       * example, "TOS" for "Terms of Service violation".
+       * 

+       *
+       * string type = 1;
+       * @return This builder for chaining.
+       */
+      public Builder clearType() {
+        type_ = getDefaultInstance().getType();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        onChanged();
+        return this;
+      }
+      /**
+       * 
+       * The type of PreconditionFailure. We recommend using a service-specific
+       * enum type to define the supported precondition violation subjects. For
+       * example, "TOS" for "Terms of Service violation".
+       * 

+       *
+       * string type = 1;
+       * @param value The bytes for type to set.
+       * @return This builder for chaining.
+       */
+      public Builder setTypeBytes(
+          com.google.protobuf.ByteString value) {
+        if (value == null) { throw new NullPointerException(); }
+        checkByteStringIsUtf8(value);
+        type_ = value;
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+
+      private java.lang.Object subject_ = "";
+      /**
+       * 
+       * The subject, relative to the type, that failed.
+       * For example, "google.com/cloud" relative to the "TOS" type would indicate
+       * which terms of service is being referenced.
+       * 

+       *
+       * string subject = 2;
+       * @return The subject.
+       */
+      public java.lang.String getSubject() {
+        java.lang.Object ref = subject_;
+        if (!(ref instanceof java.lang.String)) {
+          com.google.protobuf.ByteString bs =
+              (com.google.protobuf.ByteString) ref;
+          java.lang.String s = bs.toStringUtf8();
+          subject_ = s;
+          return s;
+        } else {
+          return (java.lang.String) ref;
+        }
+      }
+      /**
+       * 
+       * The subject, relative to the type, that failed.
+       * For example, "google.com/cloud" relative to the "TOS" type would indicate
+       * which terms of service is being referenced.
+       * 

+       *
+       * string subject = 2;
+       * @return The bytes for subject.
+       */
+      public com.google.protobuf.ByteString
+          getSubjectBytes() {
+        java.lang.Object ref = subject_;
+        if (ref instanceof String) {
+          com.google.protobuf.ByteString b = 
+              com.google.protobuf.ByteString.copyFromUtf8(
+                  (java.lang.String) ref);
+          subject_ = b;
+          return b;
+        } else {
+          return (com.google.protobuf.ByteString) ref;
+        }
+      }
+      /**
+       * 
+       * The subject, relative to the type, that failed.
+       * For example, "google.com/cloud" relative to the "TOS" type would indicate
+       * which terms of service is being referenced.
+       * 

+       *
+       * string subject = 2;
+       * @param value The subject to set.
+       * @return This builder for chaining.
+       */
+      public Builder setSubject(
+          java.lang.String value) {
+        if (value == null) { throw new NullPointerException(); }
+        subject_ = value;
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return this;
+      }
+      /**
+       * 
+       * The subject, relative to the type, that failed.
+       * For example, "google.com/cloud" relative to the "TOS" type would indicate
+       * which terms of service is being referenced.
+       * 

+       *
+       * string subject = 2;
+       * @return This builder for chaining.
+       */
+      public Builder clearSubject() {
+        subject_ = getDefaultInstance().getSubject();
+        bitField0_ = (bitField0_ & ~0x00000002);
+        onChanged();
+        return this;
+      }
+      /**
+       * 
+       * The subject, relative to the type, that failed.
+       * For example, "google.com/cloud" relative to the "TOS" type would indicate
+       * which terms of service is being referenced.
+       * 

+       *
+       * string subject = 2;
+       * @param value The bytes for subject to set.
+       * @return This builder for chaining.
+       */
+      public Builder setSubjectBytes(
+          com.google.protobuf.ByteString value) {
+        if (value == null) { throw new NullPointerException(); }
+        checkByteStringIsUtf8(value);
+        subject_ = value;
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return this;
+      }
+
+      private java.lang.Object description_ = "";
+      /**
+       * 
+       * A description of how the precondition failed. Developers can use this
+       * description to understand how to fix the failure.
+       *
+       * For example: "Terms of service not accepted".
+       * 

+       *
+       * string description = 3;
+       * @return The description.
+       */
+      public java.lang.String getDescription() {
+        java.lang.Object ref = description_;
+        if (!(ref instanceof java.lang.String)) {
+          com.google.protobuf.ByteString bs =
+              (com.google.protobuf.ByteString) ref;
+          java.lang.String s = bs.toStringUtf8();
+          description_ = s;
+          return s;
+        } else {
+          return (java.lang.String) ref;
+        }
+      }
+      /**
+       * 
+       * A description of how the precondition failed. Developers can use this
+       * description to understand how to fix the failure.
+       *
+       * For example: "Terms of service not accepted".
+       * 

+       *
+       * string description = 3;
+       * @return The bytes for description.
+       */
+      public com.google.protobuf.ByteString
+          getDescriptionBytes() {
+        java.lang.Object ref = description_;
+        if (ref instanceof String) {
+          com.google.protobuf.ByteString b = 
+              com.google.protobuf.ByteString.copyFromUtf8(
+                  (java.lang.String) ref);
+          description_ = b;
+          return b;
+        } else {
+          return (com.google.protobuf.ByteString) ref;
+        }
+      }
+      /**
+       * 
+       * A description of how the precondition failed. Developers can use this
+       * description to understand how to fix the failure.
+       *
+       * For example: "Terms of service not accepted".
+       * 

+       *
+       * string description = 3;
+       * @param value The description to set.
+       * @return This builder for chaining.
+       */
+      public Builder setDescription(
+          java.lang.String value) {
+        if (value == null) { throw new NullPointerException(); }
+        description_ = value;
+        bitField0_ |= 0x00000004;
+        onChanged();
+        return this;
+      }
+      /**
+       * 
+       * A description of how the precondition failed. Developers can use this
+       * description to understand how to fix the failure.
+       *
+       * For example: "Terms of service not accepted".
+       * 

+       *
+       * string description = 3;
+       * @return This builder for chaining.
+       */
+      public Builder clearDescription() {
+        description_ = getDefaultInstance().getDescription();
+        bitField0_ = (bitField0_ & ~0x00000004);
+        onChanged();
+        return this;
+      }
+      /**
+       * 
+       * A description of how the precondition failed. Developers can use this
+       * description to understand how to fix the failure.
+       *
+       * For example: "Terms of service not accepted".
+       * 

+       *
+       * string description = 3;
+       * @param value The bytes for description to set.
+       * @return This builder for chaining.
+       */
+      public Builder setDescriptionBytes(
+          com.google.protobuf.ByteString value) {
+        if (value == null) { throw new NullPointerException(); }
+        checkByteStringIsUtf8(value);
+        description_ = value;
+        bitField0_ |= 0x00000004;
+        onChanged();
+        return this;
+      }
+      @java.lang.Override
+      public final Builder setUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.setUnknownFields(unknownFields);
+      }
+
+      @java.lang.Override
+      public final Builder mergeUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.mergeUnknownFields(unknownFields);
+      }
+
+
+      // @@protoc_insertion_point(builder_scope:rpc.v1.PreconditionFailure.Violation)
+    }
+
+    // @@protoc_insertion_point(class_scope:rpc.v1.PreconditionFailure.Violation)
+    private static final org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation DEFAULT_INSTANCE;
+    static {
+      DEFAULT_INSTANCE = new org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation();
+    }
+
+    public static org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser
+        PARSER = new com.google.protobuf.AbstractParser() {
+      @java.lang.Override
+      public Violation parsePartialFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        Builder builder = newBuilder();
+        try {
+          builder.mergeFrom(input, extensionRegistry);
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          throw e.setUnfinishedMessage(builder.buildPartial());
+        } catch (com.google.protobuf.UninitializedMessageException e) {
+          throw e.asInvalidProtocolBufferException().setUnfinishedMessage(builder.buildPartial());
+        } catch (java.io.IOException e) {
+          throw new com.google.protobuf.InvalidProtocolBufferException(e)
+              .setUnfinishedMessage(builder.buildPartial());
+        }
+        return builder.buildPartial();
+      }
+    };
+
+    public static com.google.protobuf.Parser parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+
+  }
+
+  public static final int VIOLATIONS_FIELD_NUMBER = 1;
+  @SuppressWarnings("serial")
+  private java.util.List violations_;
+  /**
+   * 
+   * Describes all precondition violations.
+   * 

+   *
+   * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+   */
+  @java.lang.Override
+  public java.util.List getViolationsList() {
+    return violations_;
+  }
+  /**
+   * 
+   * Describes all precondition violations.
+   * 

+   *
+   * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+   */
+  @java.lang.Override
+  public java.util.List 
+      getViolationsOrBuilderList() {
+    return violations_;
+  }
+  /**
+   * 
+   * Describes all precondition violations.
+   * 

+   *
+   * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+   */
+  @java.lang.Override
+  public int getViolationsCount() {
+    return violations_.size();
+  }
+  /**
+   * 
+   * Describes all precondition violations.
+   * 

+   *
+   * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+   */
+  @java.lang.Override
+  public org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation getViolations(int index) {
+    return violations_.get(index);
+  }
+  /**
+   * 
+   * Describes all precondition violations.
+   * 

+   *
+   * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+   */
+  @java.lang.Override
+  public org.vdaas.vald.api.v1.rpc.PreconditionFailure.ViolationOrBuilder getViolationsOrBuilder(
+      int index) {
+    return violations_.get(index);
+  }
+
+  private byte memoizedIsInitialized = -1;
+  @java.lang.Override
+  public final boolean isInitialized() {
+    byte isInitialized = memoizedIsInitialized;
+    if (isInitialized == 1) return true;
+    if (isInitialized == 0) return false;
+
+    memoizedIsInitialized = 1;
+    return true;
+  }
+
+  @java.lang.Override
+  public void writeTo(com.google.protobuf.CodedOutputStream output)
+                      throws java.io.IOException {
+    for (int i = 0; i < violations_.size(); i++) {
+      output.writeMessage(1, violations_.get(i));
+    }
+    getUnknownFields().writeTo(output);
+  }
+
+  @java.lang.Override
+  public int getSerializedSize() {
+    int size = memoizedSize;
+    if (size != -1) return size;
+
+    size = 0;
+    for (int i = 0; i < violations_.size(); i++) {
+      size += com.google.protobuf.CodedOutputStream
+        .computeMessageSize(1, violations_.get(i));
+    }
+    size += getUnknownFields().getSerializedSize();
+    memoizedSize = size;
+    return size;
+  }
+
+  @java.lang.Override
+  public boolean equals(final java.lang.Object obj) {
+    if (obj == this) {
+     return true;
+    }
+    if (!(obj instanceof org.vdaas.vald.api.v1.rpc.PreconditionFailure)) {
+      return super.equals(obj);
+    }
+    org.vdaas.vald.api.v1.rpc.PreconditionFailure other = (org.vdaas.vald.api.v1.rpc.PreconditionFailure) obj;
+
+    if (!getViolationsList()
+        .equals(other.getViolationsList())) return false;
+    if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+    return true;
+  }
+
+  @java.lang.Override
+  public int hashCode() {
+    if (memoizedHashCode != 0) {
+      return memoizedHashCode;
+    }
+    int hash = 41;
+    hash = (19 * hash) + getDescriptor().hashCode();
+    if (getViolationsCount() > 0) {
+      hash = (37 * hash) + VIOLATIONS_FIELD_NUMBER;
+      hash = (53 * hash) + getViolationsList().hashCode();
+    }
+    hash = (29 * hash) + getUnknownFields().hashCode();
+    memoizedHashCode = hash;
+    return hash;
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.PreconditionFailure parseFrom(
+      java.nio.ByteBuffer data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.PreconditionFailure parseFrom(
+      java.nio.ByteBuffer data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.PreconditionFailure parseFrom(
+      com.google.protobuf.ByteString data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.PreconditionFailure parseFrom(
+      com.google.protobuf.ByteString data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.PreconditionFailure parseFrom(byte[] data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.PreconditionFailure parseFrom(
+      byte[] data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.PreconditionFailure parseFrom(java.io.InputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input);
+  }
+  public static org.vdaas.vald.api.v1.rpc.PreconditionFailure parseFrom(
+      java.io.InputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input, extensionRegistry);
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.PreconditionFailure parseDelimitedFrom(java.io.InputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseDelimitedWithIOException(PARSER, input);
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.PreconditionFailure parseDelimitedFrom(
+      java.io.InputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.PreconditionFailure parseFrom(
+      com.google.protobuf.CodedInputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input);
+  }
+  public static org.vdaas.vald.api.v1.rpc.PreconditionFailure parseFrom(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input, extensionRegistry);
+  }
+
+  @java.lang.Override
+  public Builder newBuilderForType() { return newBuilder(); }
+  public static Builder newBuilder() {
+    return DEFAULT_INSTANCE.toBuilder();
+  }
+  public static Builder newBuilder(org.vdaas.vald.api.v1.rpc.PreconditionFailure prototype) {
+    return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+  }
+  @java.lang.Override
+  public Builder toBuilder() {
+    return this == DEFAULT_INSTANCE
+        ? new Builder() : new Builder().mergeFrom(this);
+  }
+
+  @java.lang.Override
+  protected Builder newBuilderForType(
+      com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+    Builder builder = new Builder(parent);
+    return builder;
+  }
+  /**
+   * 
+   * Describes what preconditions have failed.
+   *
+   * For example, if an RPC failed because it required the Terms of Service to be
+   * acknowledged, it could list the terms of service violation in the
+   * PreconditionFailure message.
+   * 

+   *
+   * Protobuf type {@code rpc.v1.PreconditionFailure}
+   */
+  public static final class Builder extends
+      com.google.protobuf.GeneratedMessageV3.Builder implements
+      // @@protoc_insertion_point(builder_implements:rpc.v1.PreconditionFailure)
+      org.vdaas.vald.api.v1.rpc.PreconditionFailureOrBuilder {
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_PreconditionFailure_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_PreconditionFailure_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              org.vdaas.vald.api.v1.rpc.PreconditionFailure.class, org.vdaas.vald.api.v1.rpc.PreconditionFailure.Builder.class);
+    }
+
+    // Construct using org.vdaas.vald.api.v1.rpc.PreconditionFailure.newBuilder()
+    private Builder() {
+
+    }
+
+    private Builder(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      super(parent);
+
+    }
+    @java.lang.Override
+    public Builder clear() {
+      super.clear();
+      bitField0_ = 0;
+      if (violationsBuilder_ == null) {
+        violations_ = java.util.Collections.emptyList();
+      } else {
+        violations_ = null;
+        violationsBuilder_.clear();
+      }
+      bitField0_ = (bitField0_ & ~0x00000001);
+      return this;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.Descriptor
+        getDescriptorForType() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_PreconditionFailure_descriptor;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.PreconditionFailure getDefaultInstanceForType() {
+      return org.vdaas.vald.api.v1.rpc.PreconditionFailure.getDefaultInstance();
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.PreconditionFailure build() {
+      org.vdaas.vald.api.v1.rpc.PreconditionFailure result = buildPartial();
+      if (!result.isInitialized()) {
+        throw newUninitializedMessageException(result);
+      }
+      return result;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.PreconditionFailure buildPartial() {
+      org.vdaas.vald.api.v1.rpc.PreconditionFailure result = new org.vdaas.vald.api.v1.rpc.PreconditionFailure(this);
+      buildPartialRepeatedFields(result);
+      if (bitField0_ != 0) { buildPartial0(result); }
+      onBuilt();
+      return result;
+    }
+
+    private void buildPartialRepeatedFields(org.vdaas.vald.api.v1.rpc.PreconditionFailure result) {
+      if (violationsBuilder_ == null) {
+        if (((bitField0_ & 0x00000001) != 0)) {
+          violations_ = java.util.Collections.unmodifiableList(violations_);
+          bitField0_ = (bitField0_ & ~0x00000001);
+        }
+        result.violations_ = violations_;
+      } else {
+        result.violations_ = violationsBuilder_.build();
+      }
+    }
+
+    private void buildPartial0(org.vdaas.vald.api.v1.rpc.PreconditionFailure result) {
+      int from_bitField0_ = bitField0_;
+    }
+
+    @java.lang.Override
+    public Builder clone() {
+      return super.clone();
+    }
+    @java.lang.Override
+    public Builder setField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        java.lang.Object value) {
+      return super.setField(field, value);
+    }
+    @java.lang.Override
+    public Builder clearField(
+        com.google.protobuf.Descriptors.FieldDescriptor field) {
+      return super.clearField(field);
+    }
+    @java.lang.Override
+    public Builder clearOneof(
+        com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+      return super.clearOneof(oneof);
+    }
+    @java.lang.Override
+    public Builder setRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        int index, java.lang.Object value) {
+      return super.setRepeatedField(field, index, value);
+    }
+    @java.lang.Override
+    public Builder addRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        java.lang.Object value) {
+      return super.addRepeatedField(field, value);
+    }
+    @java.lang.Override
+    public Builder mergeFrom(com.google.protobuf.Message other) {
+      if (other instanceof org.vdaas.vald.api.v1.rpc.PreconditionFailure) {
+        return mergeFrom((org.vdaas.vald.api.v1.rpc.PreconditionFailure)other);
+      } else {
+        super.mergeFrom(other);
+        return this;
+      }
+    }
+
+    public Builder mergeFrom(org.vdaas.vald.api.v1.rpc.PreconditionFailure other) {
+      if (other == org.vdaas.vald.api.v1.rpc.PreconditionFailure.getDefaultInstance()) return this;
+      if (violationsBuilder_ == null) {
+        if (!other.violations_.isEmpty()) {
+          if (violations_.isEmpty()) {
+            violations_ = other.violations_;
+            bitField0_ = (bitField0_ & ~0x00000001);
+          } else {
+            ensureViolationsIsMutable();
+            violations_.addAll(other.violations_);
+          }
+          onChanged();
+        }
+      } else {
+        if (!other.violations_.isEmpty()) {
+          if (violationsBuilder_.isEmpty()) {
+            violationsBuilder_.dispose();
+            violationsBuilder_ = null;
+            violations_ = other.violations_;
+            bitField0_ = (bitField0_ & ~0x00000001);
+            violationsBuilder_ = 
+              com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders ?
+                 getViolationsFieldBuilder() : null;
+          } else {
+            violationsBuilder_.addAllMessages(other.violations_);
+          }
+        }
+      }
+      this.mergeUnknownFields(other.getUnknownFields());
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      return true;
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      if (extensionRegistry == null) {
+        throw new java.lang.NullPointerException();
+      }
+      try {
+        boolean done = false;
+        while (!done) {
+          int tag = input.readTag();
+          switch (tag) {
+            case 0:
+              done = true;
+              break;
+            case 10: {
+              org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation m =
+                  input.readMessage(
+                      org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation.parser(),
+                      extensionRegistry);
+              if (violationsBuilder_ == null) {
+                ensureViolationsIsMutable();
+                violations_.add(m);
+              } else {
+                violationsBuilder_.addMessage(m);
+              }
+              break;
+            } // case 10
+            default: {
+              if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                done = true; // was an endgroup tag
+              }
+              break;
+            } // default:
+          } // switch (tag)
+        } // while (!done)
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.unwrapIOException();
+      } finally {
+        onChanged();
+      } // finally
+      return this;
+    }
+    private int bitField0_;
+
+    private java.util.List violations_ =
+      java.util.Collections.emptyList();
+    private void ensureViolationsIsMutable() {
+      if (!((bitField0_ & 0x00000001) != 0)) {
+        violations_ = new java.util.ArrayList(violations_);
+        bitField0_ |= 0x00000001;
+       }
+    }
+
+    private com.google.protobuf.RepeatedFieldBuilderV3<
+        org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation, org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation.Builder, org.vdaas.vald.api.v1.rpc.PreconditionFailure.ViolationOrBuilder> violationsBuilder_;
+
+    /**
+     * 
+     * Describes all precondition violations.
+     * 

+     *
+     * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+     */
+    public java.util.List getViolationsList() {
+      if (violationsBuilder_ == null) {
+        return java.util.Collections.unmodifiableList(violations_);
+      } else {
+        return violationsBuilder_.getMessageList();
+      }
+    }
+    /**
+     * 
+     * Describes all precondition violations.
+     * 

+     *
+     * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+     */
+    public int getViolationsCount() {
+      if (violationsBuilder_ == null) {
+        return violations_.size();
+      } else {
+        return violationsBuilder_.getCount();
+      }
+    }
+    /**
+     * 
+     * Describes all precondition violations.
+     * 

+     *
+     * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+     */
+    public org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation getViolations(int index) {
+      if (violationsBuilder_ == null) {
+        return violations_.get(index);
+      } else {
+        return violationsBuilder_.getMessage(index);
+      }
+    }
+    /**
+     * 
+     * Describes all precondition violations.
+     * 

+     *
+     * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+     */
+    public Builder setViolations(
+        int index, org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation value) {
+      if (violationsBuilder_ == null) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        ensureViolationsIsMutable();
+        violations_.set(index, value);
+        onChanged();
+      } else {
+        violationsBuilder_.setMessage(index, value);
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all precondition violations.
+     * 

+     *
+     * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+     */
+    public Builder setViolations(
+        int index, org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation.Builder builderForValue) {
+      if (violationsBuilder_ == null) {
+        ensureViolationsIsMutable();
+        violations_.set(index, builderForValue.build());
+        onChanged();
+      } else {
+        violationsBuilder_.setMessage(index, builderForValue.build());
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all precondition violations.
+     * 

+     *
+     * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+     */
+    public Builder addViolations(org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation value) {
+      if (violationsBuilder_ == null) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        ensureViolationsIsMutable();
+        violations_.add(value);
+        onChanged();
+      } else {
+        violationsBuilder_.addMessage(value);
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all precondition violations.
+     * 

+     *
+     * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+     */
+    public Builder addViolations(
+        int index, org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation value) {
+      if (violationsBuilder_ == null) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        ensureViolationsIsMutable();
+        violations_.add(index, value);
+        onChanged();
+      } else {
+        violationsBuilder_.addMessage(index, value);
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all precondition violations.
+     * 

+     *
+     * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+     */
+    public Builder addViolations(
+        org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation.Builder builderForValue) {
+      if (violationsBuilder_ == null) {
+        ensureViolationsIsMutable();
+        violations_.add(builderForValue.build());
+        onChanged();
+      } else {
+        violationsBuilder_.addMessage(builderForValue.build());
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all precondition violations.
+     * 

+     *
+     * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+     */
+    public Builder addViolations(
+        int index, org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation.Builder builderForValue) {
+      if (violationsBuilder_ == null) {
+        ensureViolationsIsMutable();
+        violations_.add(index, builderForValue.build());
+        onChanged();
+      } else {
+        violationsBuilder_.addMessage(index, builderForValue.build());
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all precondition violations.
+     * 

+     *
+     * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+     */
+    public Builder addAllViolations(
+        java.lang.Iterable values) {
+      if (violationsBuilder_ == null) {
+        ensureViolationsIsMutable();
+        com.google.protobuf.AbstractMessageLite.Builder.addAll(
+            values, violations_);
+        onChanged();
+      } else {
+        violationsBuilder_.addAllMessages(values);
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all precondition violations.
+     * 

+     *
+     * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+     */
+    public Builder clearViolations() {
+      if (violationsBuilder_ == null) {
+        violations_ = java.util.Collections.emptyList();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        onChanged();
+      } else {
+        violationsBuilder_.clear();
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all precondition violations.
+     * 

+     *
+     * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+     */
+    public Builder removeViolations(int index) {
+      if (violationsBuilder_ == null) {
+        ensureViolationsIsMutable();
+        violations_.remove(index);
+        onChanged();
+      } else {
+        violationsBuilder_.remove(index);
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all precondition violations.
+     * 

+     *
+     * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+     */
+    public org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation.Builder getViolationsBuilder(
+        int index) {
+      return getViolationsFieldBuilder().getBuilder(index);
+    }
+    /**
+     * 
+     * Describes all precondition violations.
+     * 

+     *
+     * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+     */
+    public org.vdaas.vald.api.v1.rpc.PreconditionFailure.ViolationOrBuilder getViolationsOrBuilder(
+        int index) {
+      if (violationsBuilder_ == null) {
+        return violations_.get(index);  } else {
+        return violationsBuilder_.getMessageOrBuilder(index);
+      }
+    }
+    /**
+     * 
+     * Describes all precondition violations.
+     * 

+     *
+     * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+     */
+    public java.util.List 
+         getViolationsOrBuilderList() {
+      if (violationsBuilder_ != null) {
+        return violationsBuilder_.getMessageOrBuilderList();
+      } else {
+        return java.util.Collections.unmodifiableList(violations_);
+      }
+    }
+    /**
+     * 
+     * Describes all precondition violations.
+     * 

+     *
+     * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+     */
+    public org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation.Builder addViolationsBuilder() {
+      return getViolationsFieldBuilder().addBuilder(
+          org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation.getDefaultInstance());
+    }
+    /**
+     * 
+     * Describes all precondition violations.
+     * 

+     *
+     * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+     */
+    public org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation.Builder addViolationsBuilder(
+        int index) {
+      return getViolationsFieldBuilder().addBuilder(
+          index, org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation.getDefaultInstance());
+    }
+    /**
+     * 
+     * Describes all precondition violations.
+     * 

+     *
+     * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+     */
+    public java.util.List 
+         getViolationsBuilderList() {
+      return getViolationsFieldBuilder().getBuilderList();
+    }
+    private com.google.protobuf.RepeatedFieldBuilderV3<
+        org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation, org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation.Builder, org.vdaas.vald.api.v1.rpc.PreconditionFailure.ViolationOrBuilder> 
+        getViolationsFieldBuilder() {
+      if (violationsBuilder_ == null) {
+        violationsBuilder_ = new com.google.protobuf.RepeatedFieldBuilderV3<
+            org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation, org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation.Builder, org.vdaas.vald.api.v1.rpc.PreconditionFailure.ViolationOrBuilder>(
+                violations_,
+                ((bitField0_ & 0x00000001) != 0),
+                getParentForChildren(),
+                isClean());
+        violations_ = null;
+      }
+      return violationsBuilder_;
+    }
+    @java.lang.Override
+    public final Builder setUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.setUnknownFields(unknownFields);
+    }
+
+    @java.lang.Override
+    public final Builder mergeUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.mergeUnknownFields(unknownFields);
+    }
+
+
+    // @@protoc_insertion_point(builder_scope:rpc.v1.PreconditionFailure)
+  }
+
+  // @@protoc_insertion_point(class_scope:rpc.v1.PreconditionFailure)
+  private static final org.vdaas.vald.api.v1.rpc.PreconditionFailure DEFAULT_INSTANCE;
+  static {
+    DEFAULT_INSTANCE = new org.vdaas.vald.api.v1.rpc.PreconditionFailure();
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.PreconditionFailure getDefaultInstance() {
+    return DEFAULT_INSTANCE;
+  }
+
+  private static final com.google.protobuf.Parser
+      PARSER = new com.google.protobuf.AbstractParser() {
+    @java.lang.Override
+    public PreconditionFailure parsePartialFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      Builder builder = newBuilder();
+      try {
+        builder.mergeFrom(input, extensionRegistry);
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(builder.buildPartial());
+      } catch (com.google.protobuf.UninitializedMessageException e) {
+        throw e.asInvalidProtocolBufferException().setUnfinishedMessage(builder.buildPartial());
+      } catch (java.io.IOException e) {
+        throw new com.google.protobuf.InvalidProtocolBufferException(e)
+            .setUnfinishedMessage(builder.buildPartial());
+      }
+      return builder.buildPartial();
+    }
+  };
+
+  public static com.google.protobuf.Parser parser() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.protobuf.Parser getParserForType() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public org.vdaas.vald.api.v1.rpc.PreconditionFailure getDefaultInstanceForType() {
+    return DEFAULT_INSTANCE;
+  }
+
+}
+
diff --git a/src/main/java/org/vdaas/vald/api/v1/rpc/PreconditionFailureOrBuilder.java b/src/main/java/org/vdaas/vald/api/v1/rpc/PreconditionFailureOrBuilder.java
new file mode 100644
index 00000000..f9d484cb
--- /dev/null
+++ b/src/main/java/org/vdaas/vald/api/v1/rpc/PreconditionFailureOrBuilder.java
@@ -0,0 +1,53 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: apis/proto/v1/rpc/error_details.proto
+
+package org.vdaas.vald.api.v1.rpc;
+
+public interface PreconditionFailureOrBuilder extends
+    // @@protoc_insertion_point(interface_extends:rpc.v1.PreconditionFailure)
+    com.google.protobuf.MessageOrBuilder {
+
+  /**
+   * 
+   * Describes all precondition violations.
+   * 

+   *
+   * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+   */
+  java.util.List 
+      getViolationsList();
+  /**
+   * 
+   * Describes all precondition violations.
+   * 

+   *
+   * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+   */
+  org.vdaas.vald.api.v1.rpc.PreconditionFailure.Violation getViolations(int index);
+  /**
+   * 
+   * Describes all precondition violations.
+   * 

+   *
+   * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+   */
+  int getViolationsCount();
+  /**
+   * 
+   * Describes all precondition violations.
+   * 

+   *
+   * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+   */
+  java.util.List 
+      getViolationsOrBuilderList();
+  /**
+   * 
+   * Describes all precondition violations.
+   * 

+   *
+   * repeated .rpc.v1.PreconditionFailure.Violation violations = 1;
+   */
+  org.vdaas.vald.api.v1.rpc.PreconditionFailure.ViolationOrBuilder getViolationsOrBuilder(
+      int index);
+}
diff --git a/src/main/java/org/vdaas/vald/api/v1/rpc/QuotaFailure.java b/src/main/java/org/vdaas/vald/api/v1/rpc/QuotaFailure.java
new file mode 100644
index 00000000..8cbacf6f
--- /dev/null
+++ b/src/main/java/org/vdaas/vald/api/v1/rpc/QuotaFailure.java
@@ -0,0 +1,1733 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: apis/proto/v1/rpc/error_details.proto
+
+package org.vdaas.vald.api.v1.rpc;
+
+/**
+ * 
+ * Describes how a quota check failed.
+ *
+ * For example if a daily limit was exceeded for the calling project,
+ * a service could respond with a QuotaFailure detail containing the project
+ * id and the description of the quota limit that was exceeded.  If the
+ * calling project hasn't enabled the service in the developer console, then
+ * a service could respond with the project id and set `service_disabled`
+ * to true.
+ *
+ * Also see RetryInfo and Help types for other details about handling a
+ * quota failure.
+ * 

+ *
+ * Protobuf type {@code rpc.v1.QuotaFailure}
+ */
+public final class QuotaFailure extends
+    com.google.protobuf.GeneratedMessageV3 implements
+    // @@protoc_insertion_point(message_implements:rpc.v1.QuotaFailure)
+    QuotaFailureOrBuilder {
+private static final long serialVersionUID = 0L;
+  // Use QuotaFailure.newBuilder() to construct.
+  private QuotaFailure(com.google.protobuf.GeneratedMessageV3.Builder builder) {
+    super(builder);
+  }
+  private QuotaFailure() {
+    violations_ = java.util.Collections.emptyList();
+  }
+
+  @java.lang.Override
+  @SuppressWarnings({"unused"})
+  protected java.lang.Object newInstance(
+      UnusedPrivateParameter unused) {
+    return new QuotaFailure();
+  }
+
+  public static final com.google.protobuf.Descriptors.Descriptor
+      getDescriptor() {
+    return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_QuotaFailure_descriptor;
+  }
+
+  @java.lang.Override
+  protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internalGetFieldAccessorTable() {
+    return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_QuotaFailure_fieldAccessorTable
+        .ensureFieldAccessorsInitialized(
+            org.vdaas.vald.api.v1.rpc.QuotaFailure.class, org.vdaas.vald.api.v1.rpc.QuotaFailure.Builder.class);
+  }
+
+  public interface ViolationOrBuilder extends
+      // @@protoc_insertion_point(interface_extends:rpc.v1.QuotaFailure.Violation)
+      com.google.protobuf.MessageOrBuilder {
+
+    /**
+     * 
+     * The subject on which the quota check failed.
+     * For example, "clientip:<ip address of client>" or "project:<Google
+     * developer project id>".
+     * 

+     *
+     * string subject = 1;
+     * @return The subject.
+     */
+    java.lang.String getSubject();
+    /**
+     * 
+     * The subject on which the quota check failed.
+     * For example, "clientip:<ip address of client>" or "project:<Google
+     * developer project id>".
+     * 

+     *
+     * string subject = 1;
+     * @return The bytes for subject.
+     */
+    com.google.protobuf.ByteString
+        getSubjectBytes();
+
+    /**
+     * 
+     * A description of how the quota check failed. Clients can use this
+     * description to find more about the quota configuration in the service's
+     * public documentation, or find the relevant quota limit to adjust through
+     * developer console.
+     *
+     * For example: "Service disabled" or "Daily Limit for read operations
+     * exceeded".
+     * 

+     *
+     * string description = 2;
+     * @return The description.
+     */
+    java.lang.String getDescription();
+    /**
+     * 
+     * A description of how the quota check failed. Clients can use this
+     * description to find more about the quota configuration in the service's
+     * public documentation, or find the relevant quota limit to adjust through
+     * developer console.
+     *
+     * For example: "Service disabled" or "Daily Limit for read operations
+     * exceeded".
+     * 

+     *
+     * string description = 2;
+     * @return The bytes for description.
+     */
+    com.google.protobuf.ByteString
+        getDescriptionBytes();
+  }
+  /**
+   * 
+   * A message type used to describe a single quota violation.  For example, a
+   * daily quota or a custom quota that was exceeded.
+   * 

+   *
+   * Protobuf type {@code rpc.v1.QuotaFailure.Violation}
+   */
+  public static final class Violation extends
+      com.google.protobuf.GeneratedMessageV3 implements
+      // @@protoc_insertion_point(message_implements:rpc.v1.QuotaFailure.Violation)
+      ViolationOrBuilder {
+  private static final long serialVersionUID = 0L;
+    // Use Violation.newBuilder() to construct.
+    private Violation(com.google.protobuf.GeneratedMessageV3.Builder builder) {
+      super(builder);
+    }
+    private Violation() {
+      subject_ = "";
+      description_ = "";
+    }
+
+    @java.lang.Override
+    @SuppressWarnings({"unused"})
+    protected java.lang.Object newInstance(
+        UnusedPrivateParameter unused) {
+      return new Violation();
+    }
+
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_QuotaFailure_Violation_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_QuotaFailure_Violation_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation.class, org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation.Builder.class);
+    }
+
+    public static final int SUBJECT_FIELD_NUMBER = 1;
+    @SuppressWarnings("serial")
+    private volatile java.lang.Object subject_ = "";
+    /**
+     * 
+     * The subject on which the quota check failed.
+     * For example, "clientip:<ip address of client>" or "project:<Google
+     * developer project id>".
+     * 

+     *
+     * string subject = 1;
+     * @return The subject.
+     */
+    @java.lang.Override
+    public java.lang.String getSubject() {
+      java.lang.Object ref = subject_;
+      if (ref instanceof java.lang.String) {
+        return (java.lang.String) ref;
+      } else {
+        com.google.protobuf.ByteString bs = 
+            (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        subject_ = s;
+        return s;
+      }
+    }
+    /**
+     * 
+     * The subject on which the quota check failed.
+     * For example, "clientip:<ip address of client>" or "project:<Google
+     * developer project id>".
+     * 

+     *
+     * string subject = 1;
+     * @return The bytes for subject.
+     */
+    @java.lang.Override
+    public com.google.protobuf.ByteString
+        getSubjectBytes() {
+      java.lang.Object ref = subject_;
+      if (ref instanceof java.lang.String) {
+        com.google.protobuf.ByteString b = 
+            com.google.protobuf.ByteString.copyFromUtf8(
+                (java.lang.String) ref);
+        subject_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+
+    public static final int DESCRIPTION_FIELD_NUMBER = 2;
+    @SuppressWarnings("serial")
+    private volatile java.lang.Object description_ = "";
+    /**
+     * 
+     * A description of how the quota check failed. Clients can use this
+     * description to find more about the quota configuration in the service's
+     * public documentation, or find the relevant quota limit to adjust through
+     * developer console.
+     *
+     * For example: "Service disabled" or "Daily Limit for read operations
+     * exceeded".
+     * 

+     *
+     * string description = 2;
+     * @return The description.
+     */
+    @java.lang.Override
+    public java.lang.String getDescription() {
+      java.lang.Object ref = description_;
+      if (ref instanceof java.lang.String) {
+        return (java.lang.String) ref;
+      } else {
+        com.google.protobuf.ByteString bs = 
+            (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        description_ = s;
+        return s;
+      }
+    }
+    /**
+     * 
+     * A description of how the quota check failed. Clients can use this
+     * description to find more about the quota configuration in the service's
+     * public documentation, or find the relevant quota limit to adjust through
+     * developer console.
+     *
+     * For example: "Service disabled" or "Daily Limit for read operations
+     * exceeded".
+     * 

+     *
+     * string description = 2;
+     * @return The bytes for description.
+     */
+    @java.lang.Override
+    public com.google.protobuf.ByteString
+        getDescriptionBytes() {
+      java.lang.Object ref = description_;
+      if (ref instanceof java.lang.String) {
+        com.google.protobuf.ByteString b = 
+            com.google.protobuf.ByteString.copyFromUtf8(
+                (java.lang.String) ref);
+        description_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
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+    @java.lang.Override
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+      memoizedIsInitialized = 1;
+      return true;
+    }
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+    @java.lang.Override
+    public void writeTo(com.google.protobuf.CodedOutputStream output)
+                        throws java.io.IOException {
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(subject_)) {
+        com.google.protobuf.GeneratedMessageV3.writeString(output, 1, subject_);
+      }
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
+        com.google.protobuf.GeneratedMessageV3.writeString(output, 2, description_);
+      }
+      getUnknownFields().writeTo(output);
+    }
+
+    @java.lang.Override
+    public int getSerializedSize() {
+      int size = memoizedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(subject_)) {
+        size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, subject_);
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+      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(description_)) {
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+      }
+      size += getUnknownFields().getSerializedSize();
+      memoizedSize = size;
+      return size;
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+       return true;
+      }
+      if (!(obj instanceof org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation)) {
+        return super.equals(obj);
+      }
+      org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation other = (org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation) obj;
+
+      if (!getSubject()
+          .equals(other.getSubject())) return false;
+      if (!getDescription()
+          .equals(other.getDescription())) return false;
+      if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+      return true;
+    }
+
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      hash = (37 * hash) + SUBJECT_FIELD_NUMBER;
+      hash = (53 * hash) + getSubject().hashCode();
+      hash = (37 * hash) + DESCRIPTION_FIELD_NUMBER;
+      hash = (53 * hash) + getDescription().hashCode();
+      hash = (29 * hash) + getUnknownFields().hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation parseFrom(
+        java.nio.ByteBuffer data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation parseFrom(
+        java.nio.ByteBuffer data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation parseFrom(byte[] data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation parseFrom(
+        byte[] data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation parseFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input);
+    }
+    public static org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation parseFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input, extensionRegistry);
+    }
+
+    public static org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation parseDelimitedFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseDelimitedWithIOException(PARSER, input);
+    }
+
+    public static org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation parseDelimitedFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
+    }
+    public static org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation parseFrom(
+        com.google.protobuf.CodedInputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input);
+    }
+    public static org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() { return newBuilder(); }
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+    public static Builder newBuilder(org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE
+          ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+    /**
+     * 
+     * A message type used to describe a single quota violation.  For example, a
+     * daily quota or a custom quota that was exceeded.
+     * 

+     *
+     * Protobuf type {@code rpc.v1.QuotaFailure.Violation}
+     */
+    public static final class Builder extends
+        com.google.protobuf.GeneratedMessageV3.Builder implements
+        // @@protoc_insertion_point(builder_implements:rpc.v1.QuotaFailure.Violation)
+        org.vdaas.vald.api.v1.rpc.QuotaFailure.ViolationOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor
+          getDescriptor() {
+        return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_QuotaFailure_Violation_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_QuotaFailure_Violation_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation.class, org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation.Builder.class);
+      }
+
+      // Construct using org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation.newBuilder()
+      private Builder() {
+
+      }
+
+      private Builder(
+          com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+        super(parent);
+
+      }
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        bitField0_ = 0;
+        subject_ = "";
+        description_ = "";
+        return this;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor
+          getDescriptorForType() {
+        return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_QuotaFailure_Violation_descriptor;
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation getDefaultInstanceForType() {
+        return org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation.getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation build() {
+        org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation buildPartial() {
+        org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation result = new org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation(this);
+        if (bitField0_ != 0) { buildPartial0(result); }
+        onBuilt();
+        return result;
+      }
+
+      private void buildPartial0(org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation result) {
+        int from_bitField0_ = bitField0_;
+        if (((from_bitField0_ & 0x00000001) != 0)) {
+          result.subject_ = subject_;
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+        if (((from_bitField0_ & 0x00000002) != 0)) {
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+      @java.lang.Override
+      public Builder clone() {
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+      @java.lang.Override
+      public Builder setField(
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+          java.lang.Object value) {
+        return super.setField(field, value);
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+      @java.lang.Override
+      public Builder clearField(
+          com.google.protobuf.Descriptors.FieldDescriptor field) {
+        return super.clearField(field);
+      }
+      @java.lang.Override
+      public Builder clearOneof(
+          com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+        return super.clearOneof(oneof);
+      }
+      @java.lang.Override
+      public Builder setRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          int index, java.lang.Object value) {
+        return super.setRepeatedField(field, index, value);
+      }
+      @java.lang.Override
+      public Builder addRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          java.lang.Object value) {
+        return super.addRepeatedField(field, value);
+      }
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation) {
+          return mergeFrom((org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation)other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation other) {
+        if (other == org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation.getDefaultInstance()) return this;
+        if (!other.getSubject().isEmpty()) {
+          subject_ = other.subject_;
+          bitField0_ |= 0x00000001;
+          onChanged();
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+        if (!other.getDescription().isEmpty()) {
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+        this.mergeUnknownFields(other.getUnknownFields());
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
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+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        if (extensionRegistry == null) {
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+        try {
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+          while (!done) {
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+                done = true;
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+              case 10: {
+                subject_ = input.readStringRequireUtf8();
+                bitField0_ |= 0x00000001;
+                break;
+              } // case 10
+              case 18: {
+                description_ = input.readStringRequireUtf8();
+                bitField0_ |= 0x00000002;
+                break;
+              } // case 18
+              default: {
+                if (!super.parseUnknownField(input, extensionRegistry, tag)) {
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+                break;
+              } // default:
+            } // switch (tag)
+          } // while (!done)
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          throw e.unwrapIOException();
+        } finally {
+          onChanged();
+        } // finally
+        return this;
+      }
+      private int bitField0_;
+
+      private java.lang.Object subject_ = "";
+      /**
+       * 
+       * The subject on which the quota check failed.
+       * For example, "clientip:<ip address of client>" or "project:<Google
+       * developer project id>".
+       * 

+       *
+       * string subject = 1;
+       * @return The subject.
+       */
+      public java.lang.String getSubject() {
+        java.lang.Object ref = subject_;
+        if (!(ref instanceof java.lang.String)) {
+          com.google.protobuf.ByteString bs =
+              (com.google.protobuf.ByteString) ref;
+          java.lang.String s = bs.toStringUtf8();
+          subject_ = s;
+          return s;
+        } else {
+          return (java.lang.String) ref;
+        }
+      }
+      /**
+       * 
+       * The subject on which the quota check failed.
+       * For example, "clientip:<ip address of client>" or "project:<Google
+       * developer project id>".
+       * 

+       *
+       * string subject = 1;
+       * @return The bytes for subject.
+       */
+      public com.google.protobuf.ByteString
+          getSubjectBytes() {
+        java.lang.Object ref = subject_;
+        if (ref instanceof String) {
+          com.google.protobuf.ByteString b = 
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+          subject_ = b;
+          return b;
+        } else {
+          return (com.google.protobuf.ByteString) ref;
+        }
+      }
+      /**
+       * 
+       * The subject on which the quota check failed.
+       * For example, "clientip:<ip address of client>" or "project:<Google
+       * developer project id>".
+       * 

+       *
+       * string subject = 1;
+       * @param value The subject to set.
+       * @return This builder for chaining.
+       */
+      public Builder setSubject(
+          java.lang.String value) {
+        if (value == null) { throw new NullPointerException(); }
+        subject_ = value;
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+      /**
+       * 
+       * The subject on which the quota check failed.
+       * For example, "clientip:<ip address of client>" or "project:<Google
+       * developer project id>".
+       * 

+       *
+       * string subject = 1;
+       * @return This builder for chaining.
+       */
+      public Builder clearSubject() {
+        subject_ = getDefaultInstance().getSubject();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        onChanged();
+        return this;
+      }
+      /**
+       * 
+       * The subject on which the quota check failed.
+       * For example, "clientip:<ip address of client>" or "project:<Google
+       * developer project id>".
+       * 

+       *
+       * string subject = 1;
+       * @param value The bytes for subject to set.
+       * @return This builder for chaining.
+       */
+      public Builder setSubjectBytes(
+          com.google.protobuf.ByteString value) {
+        if (value == null) { throw new NullPointerException(); }
+        checkByteStringIsUtf8(value);
+        subject_ = value;
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return this;
+      }
+
+      private java.lang.Object description_ = "";
+      /**
+       * 
+       * A description of how the quota check failed. Clients can use this
+       * description to find more about the quota configuration in the service's
+       * public documentation, or find the relevant quota limit to adjust through
+       * developer console.
+       *
+       * For example: "Service disabled" or "Daily Limit for read operations
+       * exceeded".
+       * 

+       *
+       * string description = 2;
+       * @return The description.
+       */
+      public java.lang.String getDescription() {
+        java.lang.Object ref = description_;
+        if (!(ref instanceof java.lang.String)) {
+          com.google.protobuf.ByteString bs =
+              (com.google.protobuf.ByteString) ref;
+          java.lang.String s = bs.toStringUtf8();
+          description_ = s;
+          return s;
+        } else {
+          return (java.lang.String) ref;
+        }
+      }
+      /**
+       * 
+       * A description of how the quota check failed. Clients can use this
+       * description to find more about the quota configuration in the service's
+       * public documentation, or find the relevant quota limit to adjust through
+       * developer console.
+       *
+       * For example: "Service disabled" or "Daily Limit for read operations
+       * exceeded".
+       * 

+       *
+       * string description = 2;
+       * @return The bytes for description.
+       */
+      public com.google.protobuf.ByteString
+          getDescriptionBytes() {
+        java.lang.Object ref = description_;
+        if (ref instanceof String) {
+          com.google.protobuf.ByteString b = 
+              com.google.protobuf.ByteString.copyFromUtf8(
+                  (java.lang.String) ref);
+          description_ = b;
+          return b;
+        } else {
+          return (com.google.protobuf.ByteString) ref;
+        }
+      }
+      /**
+       * 
+       * A description of how the quota check failed. Clients can use this
+       * description to find more about the quota configuration in the service's
+       * public documentation, or find the relevant quota limit to adjust through
+       * developer console.
+       *
+       * For example: "Service disabled" or "Daily Limit for read operations
+       * exceeded".
+       * 

+       *
+       * string description = 2;
+       * @param value The description to set.
+       * @return This builder for chaining.
+       */
+      public Builder setDescription(
+          java.lang.String value) {
+        if (value == null) { throw new NullPointerException(); }
+        description_ = value;
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return this;
+      }
+      /**
+       * 
+       * A description of how the quota check failed. Clients can use this
+       * description to find more about the quota configuration in the service's
+       * public documentation, or find the relevant quota limit to adjust through
+       * developer console.
+       *
+       * For example: "Service disabled" or "Daily Limit for read operations
+       * exceeded".
+       * 

+       *
+       * string description = 2;
+       * @return This builder for chaining.
+       */
+      public Builder clearDescription() {
+        description_ = getDefaultInstance().getDescription();
+        bitField0_ = (bitField0_ & ~0x00000002);
+        onChanged();
+        return this;
+      }
+      /**
+       * 
+       * A description of how the quota check failed. Clients can use this
+       * description to find more about the quota configuration in the service's
+       * public documentation, or find the relevant quota limit to adjust through
+       * developer console.
+       *
+       * For example: "Service disabled" or "Daily Limit for read operations
+       * exceeded".
+       * 

+       *
+       * string description = 2;
+       * @param value The bytes for description to set.
+       * @return This builder for chaining.
+       */
+      public Builder setDescriptionBytes(
+          com.google.protobuf.ByteString value) {
+        if (value == null) { throw new NullPointerException(); }
+        checkByteStringIsUtf8(value);
+        description_ = value;
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return this;
+      }
+      @java.lang.Override
+      public final Builder setUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.setUnknownFields(unknownFields);
+      }
+
+      @java.lang.Override
+      public final Builder mergeUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.mergeUnknownFields(unknownFields);
+      }
+
+
+      // @@protoc_insertion_point(builder_scope:rpc.v1.QuotaFailure.Violation)
+    }
+
+    // @@protoc_insertion_point(class_scope:rpc.v1.QuotaFailure.Violation)
+    private static final org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation DEFAULT_INSTANCE;
+    static {
+      DEFAULT_INSTANCE = new org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation();
+    }
+
+    public static org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser
+        PARSER = new com.google.protobuf.AbstractParser() {
+      @java.lang.Override
+      public Violation parsePartialFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        Builder builder = newBuilder();
+        try {
+          builder.mergeFrom(input, extensionRegistry);
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          throw e.setUnfinishedMessage(builder.buildPartial());
+        } catch (com.google.protobuf.UninitializedMessageException e) {
+          throw e.asInvalidProtocolBufferException().setUnfinishedMessage(builder.buildPartial());
+        } catch (java.io.IOException e) {
+          throw new com.google.protobuf.InvalidProtocolBufferException(e)
+              .setUnfinishedMessage(builder.buildPartial());
+        }
+        return builder.buildPartial();
+      }
+    };
+
+    public static com.google.protobuf.Parser parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+
+  }
+
+  public static final int VIOLATIONS_FIELD_NUMBER = 1;
+  @SuppressWarnings("serial")
+  private java.util.List violations_;
+  /**
+   * 
+   * Describes all quota violations.
+   * 

+   *
+   * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+   */
+  @java.lang.Override
+  public java.util.List getViolationsList() {
+    return violations_;
+  }
+  /**
+   * 
+   * Describes all quota violations.
+   * 

+   *
+   * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+   */
+  @java.lang.Override
+  public java.util.List 
+      getViolationsOrBuilderList() {
+    return violations_;
+  }
+  /**
+   * 
+   * Describes all quota violations.
+   * 

+   *
+   * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+   */
+  @java.lang.Override
+  public int getViolationsCount() {
+    return violations_.size();
+  }
+  /**
+   * 
+   * Describes all quota violations.
+   * 

+   *
+   * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+   */
+  @java.lang.Override
+  public org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation getViolations(int index) {
+    return violations_.get(index);
+  }
+  /**
+   * 
+   * Describes all quota violations.
+   * 

+   *
+   * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+   */
+  @java.lang.Override
+  public org.vdaas.vald.api.v1.rpc.QuotaFailure.ViolationOrBuilder getViolationsOrBuilder(
+      int index) {
+    return violations_.get(index);
+  }
+
+  private byte memoizedIsInitialized = -1;
+  @java.lang.Override
+  public final boolean isInitialized() {
+    byte isInitialized = memoizedIsInitialized;
+    if (isInitialized == 1) return true;
+    if (isInitialized == 0) return false;
+
+    memoizedIsInitialized = 1;
+    return true;
+  }
+
+  @java.lang.Override
+  public void writeTo(com.google.protobuf.CodedOutputStream output)
+                      throws java.io.IOException {
+    for (int i = 0; i < violations_.size(); i++) {
+      output.writeMessage(1, violations_.get(i));
+    }
+    getUnknownFields().writeTo(output);
+  }
+
+  @java.lang.Override
+  public int getSerializedSize() {
+    int size = memoizedSize;
+    if (size != -1) return size;
+
+    size = 0;
+    for (int i = 0; i < violations_.size(); i++) {
+      size += com.google.protobuf.CodedOutputStream
+        .computeMessageSize(1, violations_.get(i));
+    }
+    size += getUnknownFields().getSerializedSize();
+    memoizedSize = size;
+    return size;
+  }
+
+  @java.lang.Override
+  public boolean equals(final java.lang.Object obj) {
+    if (obj == this) {
+     return true;
+    }
+    if (!(obj instanceof org.vdaas.vald.api.v1.rpc.QuotaFailure)) {
+      return super.equals(obj);
+    }
+    org.vdaas.vald.api.v1.rpc.QuotaFailure other = (org.vdaas.vald.api.v1.rpc.QuotaFailure) obj;
+
+    if (!getViolationsList()
+        .equals(other.getViolationsList())) return false;
+    if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+    return true;
+  }
+
+  @java.lang.Override
+  public int hashCode() {
+    if (memoizedHashCode != 0) {
+      return memoizedHashCode;
+    }
+    int hash = 41;
+    hash = (19 * hash) + getDescriptor().hashCode();
+    if (getViolationsCount() > 0) {
+      hash = (37 * hash) + VIOLATIONS_FIELD_NUMBER;
+      hash = (53 * hash) + getViolationsList().hashCode();
+    }
+    hash = (29 * hash) + getUnknownFields().hashCode();
+    memoizedHashCode = hash;
+    return hash;
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.QuotaFailure parseFrom(
+      java.nio.ByteBuffer data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.QuotaFailure parseFrom(
+      java.nio.ByteBuffer data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.QuotaFailure parseFrom(
+      com.google.protobuf.ByteString data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.QuotaFailure parseFrom(
+      com.google.protobuf.ByteString data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.QuotaFailure parseFrom(byte[] data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.QuotaFailure parseFrom(
+      byte[] data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.QuotaFailure parseFrom(java.io.InputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input);
+  }
+  public static org.vdaas.vald.api.v1.rpc.QuotaFailure parseFrom(
+      java.io.InputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input, extensionRegistry);
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.QuotaFailure parseDelimitedFrom(java.io.InputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseDelimitedWithIOException(PARSER, input);
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.QuotaFailure parseDelimitedFrom(
+      java.io.InputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.QuotaFailure parseFrom(
+      com.google.protobuf.CodedInputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input);
+  }
+  public static org.vdaas.vald.api.v1.rpc.QuotaFailure parseFrom(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input, extensionRegistry);
+  }
+
+  @java.lang.Override
+  public Builder newBuilderForType() { return newBuilder(); }
+  public static Builder newBuilder() {
+    return DEFAULT_INSTANCE.toBuilder();
+  }
+  public static Builder newBuilder(org.vdaas.vald.api.v1.rpc.QuotaFailure prototype) {
+    return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+  }
+  @java.lang.Override
+  public Builder toBuilder() {
+    return this == DEFAULT_INSTANCE
+        ? new Builder() : new Builder().mergeFrom(this);
+  }
+
+  @java.lang.Override
+  protected Builder newBuilderForType(
+      com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+    Builder builder = new Builder(parent);
+    return builder;
+  }
+  /**
+   * 
+   * Describes how a quota check failed.
+   *
+   * For example if a daily limit was exceeded for the calling project,
+   * a service could respond with a QuotaFailure detail containing the project
+   * id and the description of the quota limit that was exceeded.  If the
+   * calling project hasn't enabled the service in the developer console, then
+   * a service could respond with the project id and set `service_disabled`
+   * to true.
+   *
+   * Also see RetryInfo and Help types for other details about handling a
+   * quota failure.
+   * 

+   *
+   * Protobuf type {@code rpc.v1.QuotaFailure}
+   */
+  public static final class Builder extends
+      com.google.protobuf.GeneratedMessageV3.Builder implements
+      // @@protoc_insertion_point(builder_implements:rpc.v1.QuotaFailure)
+      org.vdaas.vald.api.v1.rpc.QuotaFailureOrBuilder {
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_QuotaFailure_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_QuotaFailure_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              org.vdaas.vald.api.v1.rpc.QuotaFailure.class, org.vdaas.vald.api.v1.rpc.QuotaFailure.Builder.class);
+    }
+
+    // Construct using org.vdaas.vald.api.v1.rpc.QuotaFailure.newBuilder()
+    private Builder() {
+
+    }
+
+    private Builder(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      super(parent);
+
+    }
+    @java.lang.Override
+    public Builder clear() {
+      super.clear();
+      bitField0_ = 0;
+      if (violationsBuilder_ == null) {
+        violations_ = java.util.Collections.emptyList();
+      } else {
+        violations_ = null;
+        violationsBuilder_.clear();
+      }
+      bitField0_ = (bitField0_ & ~0x00000001);
+      return this;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.Descriptor
+        getDescriptorForType() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_QuotaFailure_descriptor;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.QuotaFailure getDefaultInstanceForType() {
+      return org.vdaas.vald.api.v1.rpc.QuotaFailure.getDefaultInstance();
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.QuotaFailure build() {
+      org.vdaas.vald.api.v1.rpc.QuotaFailure result = buildPartial();
+      if (!result.isInitialized()) {
+        throw newUninitializedMessageException(result);
+      }
+      return result;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.QuotaFailure buildPartial() {
+      org.vdaas.vald.api.v1.rpc.QuotaFailure result = new org.vdaas.vald.api.v1.rpc.QuotaFailure(this);
+      buildPartialRepeatedFields(result);
+      if (bitField0_ != 0) { buildPartial0(result); }
+      onBuilt();
+      return result;
+    }
+
+    private void buildPartialRepeatedFields(org.vdaas.vald.api.v1.rpc.QuotaFailure result) {
+      if (violationsBuilder_ == null) {
+        if (((bitField0_ & 0x00000001) != 0)) {
+          violations_ = java.util.Collections.unmodifiableList(violations_);
+          bitField0_ = (bitField0_ & ~0x00000001);
+        }
+        result.violations_ = violations_;
+      } else {
+        result.violations_ = violationsBuilder_.build();
+      }
+    }
+
+    private void buildPartial0(org.vdaas.vald.api.v1.rpc.QuotaFailure result) {
+      int from_bitField0_ = bitField0_;
+    }
+
+    @java.lang.Override
+    public Builder clone() {
+      return super.clone();
+    }
+    @java.lang.Override
+    public Builder setField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        java.lang.Object value) {
+      return super.setField(field, value);
+    }
+    @java.lang.Override
+    public Builder clearField(
+        com.google.protobuf.Descriptors.FieldDescriptor field) {
+      return super.clearField(field);
+    }
+    @java.lang.Override
+    public Builder clearOneof(
+        com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+      return super.clearOneof(oneof);
+    }
+    @java.lang.Override
+    public Builder setRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        int index, java.lang.Object value) {
+      return super.setRepeatedField(field, index, value);
+    }
+    @java.lang.Override
+    public Builder addRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        java.lang.Object value) {
+      return super.addRepeatedField(field, value);
+    }
+    @java.lang.Override
+    public Builder mergeFrom(com.google.protobuf.Message other) {
+      if (other instanceof org.vdaas.vald.api.v1.rpc.QuotaFailure) {
+        return mergeFrom((org.vdaas.vald.api.v1.rpc.QuotaFailure)other);
+      } else {
+        super.mergeFrom(other);
+        return this;
+      }
+    }
+
+    public Builder mergeFrom(org.vdaas.vald.api.v1.rpc.QuotaFailure other) {
+      if (other == org.vdaas.vald.api.v1.rpc.QuotaFailure.getDefaultInstance()) return this;
+      if (violationsBuilder_ == null) {
+        if (!other.violations_.isEmpty()) {
+          if (violations_.isEmpty()) {
+            violations_ = other.violations_;
+            bitField0_ = (bitField0_ & ~0x00000001);
+          } else {
+            ensureViolationsIsMutable();
+            violations_.addAll(other.violations_);
+          }
+          onChanged();
+        }
+      } else {
+        if (!other.violations_.isEmpty()) {
+          if (violationsBuilder_.isEmpty()) {
+            violationsBuilder_.dispose();
+            violationsBuilder_ = null;
+            violations_ = other.violations_;
+            bitField0_ = (bitField0_ & ~0x00000001);
+            violationsBuilder_ = 
+              com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders ?
+                 getViolationsFieldBuilder() : null;
+          } else {
+            violationsBuilder_.addAllMessages(other.violations_);
+          }
+        }
+      }
+      this.mergeUnknownFields(other.getUnknownFields());
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      return true;
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      if (extensionRegistry == null) {
+        throw new java.lang.NullPointerException();
+      }
+      try {
+        boolean done = false;
+        while (!done) {
+          int tag = input.readTag();
+          switch (tag) {
+            case 0:
+              done = true;
+              break;
+            case 10: {
+              org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation m =
+                  input.readMessage(
+                      org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation.parser(),
+                      extensionRegistry);
+              if (violationsBuilder_ == null) {
+                ensureViolationsIsMutable();
+                violations_.add(m);
+              } else {
+                violationsBuilder_.addMessage(m);
+              }
+              break;
+            } // case 10
+            default: {
+              if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                done = true; // was an endgroup tag
+              }
+              break;
+            } // default:
+          } // switch (tag)
+        } // while (!done)
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.unwrapIOException();
+      } finally {
+        onChanged();
+      } // finally
+      return this;
+    }
+    private int bitField0_;
+
+    private java.util.List violations_ =
+      java.util.Collections.emptyList();
+    private void ensureViolationsIsMutable() {
+      if (!((bitField0_ & 0x00000001) != 0)) {
+        violations_ = new java.util.ArrayList(violations_);
+        bitField0_ |= 0x00000001;
+       }
+    }
+
+    private com.google.protobuf.RepeatedFieldBuilderV3<
+        org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation, org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation.Builder, org.vdaas.vald.api.v1.rpc.QuotaFailure.ViolationOrBuilder> violationsBuilder_;
+
+    /**
+     * 
+     * Describes all quota violations.
+     * 

+     *
+     * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+     */
+    public java.util.List getViolationsList() {
+      if (violationsBuilder_ == null) {
+        return java.util.Collections.unmodifiableList(violations_);
+      } else {
+        return violationsBuilder_.getMessageList();
+      }
+    }
+    /**
+     * 
+     * Describes all quota violations.
+     * 

+     *
+     * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+     */
+    public int getViolationsCount() {
+      if (violationsBuilder_ == null) {
+        return violations_.size();
+      } else {
+        return violationsBuilder_.getCount();
+      }
+    }
+    /**
+     * 
+     * Describes all quota violations.
+     * 

+     *
+     * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+     */
+    public org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation getViolations(int index) {
+      if (violationsBuilder_ == null) {
+        return violations_.get(index);
+      } else {
+        return violationsBuilder_.getMessage(index);
+      }
+    }
+    /**
+     * 
+     * Describes all quota violations.
+     * 

+     *
+     * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+     */
+    public Builder setViolations(
+        int index, org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation value) {
+      if (violationsBuilder_ == null) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        ensureViolationsIsMutable();
+        violations_.set(index, value);
+        onChanged();
+      } else {
+        violationsBuilder_.setMessage(index, value);
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all quota violations.
+     * 

+     *
+     * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+     */
+    public Builder setViolations(
+        int index, org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation.Builder builderForValue) {
+      if (violationsBuilder_ == null) {
+        ensureViolationsIsMutable();
+        violations_.set(index, builderForValue.build());
+        onChanged();
+      } else {
+        violationsBuilder_.setMessage(index, builderForValue.build());
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all quota violations.
+     * 

+     *
+     * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+     */
+    public Builder addViolations(org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation value) {
+      if (violationsBuilder_ == null) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        ensureViolationsIsMutable();
+        violations_.add(value);
+        onChanged();
+      } else {
+        violationsBuilder_.addMessage(value);
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all quota violations.
+     * 

+     *
+     * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+     */
+    public Builder addViolations(
+        int index, org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation value) {
+      if (violationsBuilder_ == null) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        ensureViolationsIsMutable();
+        violations_.add(index, value);
+        onChanged();
+      } else {
+        violationsBuilder_.addMessage(index, value);
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all quota violations.
+     * 

+     *
+     * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+     */
+    public Builder addViolations(
+        org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation.Builder builderForValue) {
+      if (violationsBuilder_ == null) {
+        ensureViolationsIsMutable();
+        violations_.add(builderForValue.build());
+        onChanged();
+      } else {
+        violationsBuilder_.addMessage(builderForValue.build());
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all quota violations.
+     * 

+     *
+     * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+     */
+    public Builder addViolations(
+        int index, org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation.Builder builderForValue) {
+      if (violationsBuilder_ == null) {
+        ensureViolationsIsMutable();
+        violations_.add(index, builderForValue.build());
+        onChanged();
+      } else {
+        violationsBuilder_.addMessage(index, builderForValue.build());
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all quota violations.
+     * 

+     *
+     * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+     */
+    public Builder addAllViolations(
+        java.lang.Iterable values) {
+      if (violationsBuilder_ == null) {
+        ensureViolationsIsMutable();
+        com.google.protobuf.AbstractMessageLite.Builder.addAll(
+            values, violations_);
+        onChanged();
+      } else {
+        violationsBuilder_.addAllMessages(values);
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all quota violations.
+     * 

+     *
+     * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+     */
+    public Builder clearViolations() {
+      if (violationsBuilder_ == null) {
+        violations_ = java.util.Collections.emptyList();
+        bitField0_ = (bitField0_ & ~0x00000001);
+        onChanged();
+      } else {
+        violationsBuilder_.clear();
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all quota violations.
+     * 

+     *
+     * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+     */
+    public Builder removeViolations(int index) {
+      if (violationsBuilder_ == null) {
+        ensureViolationsIsMutable();
+        violations_.remove(index);
+        onChanged();
+      } else {
+        violationsBuilder_.remove(index);
+      }
+      return this;
+    }
+    /**
+     * 
+     * Describes all quota violations.
+     * 

+     *
+     * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+     */
+    public org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation.Builder getViolationsBuilder(
+        int index) {
+      return getViolationsFieldBuilder().getBuilder(index);
+    }
+    /**
+     * 
+     * Describes all quota violations.
+     * 

+     *
+     * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+     */
+    public org.vdaas.vald.api.v1.rpc.QuotaFailure.ViolationOrBuilder getViolationsOrBuilder(
+        int index) {
+      if (violationsBuilder_ == null) {
+        return violations_.get(index);  } else {
+        return violationsBuilder_.getMessageOrBuilder(index);
+      }
+    }
+    /**
+     * 
+     * Describes all quota violations.
+     * 

+     *
+     * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+     */
+    public java.util.List 
+         getViolationsOrBuilderList() {
+      if (violationsBuilder_ != null) {
+        return violationsBuilder_.getMessageOrBuilderList();
+      } else {
+        return java.util.Collections.unmodifiableList(violations_);
+      }
+    }
+    /**
+     * 
+     * Describes all quota violations.
+     * 

+     *
+     * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+     */
+    public org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation.Builder addViolationsBuilder() {
+      return getViolationsFieldBuilder().addBuilder(
+          org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation.getDefaultInstance());
+    }
+    /**
+     * 
+     * Describes all quota violations.
+     * 

+     *
+     * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+     */
+    public org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation.Builder addViolationsBuilder(
+        int index) {
+      return getViolationsFieldBuilder().addBuilder(
+          index, org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation.getDefaultInstance());
+    }
+    /**
+     * 
+     * Describes all quota violations.
+     * 

+     *
+     * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+     */
+    public java.util.List 
+         getViolationsBuilderList() {
+      return getViolationsFieldBuilder().getBuilderList();
+    }
+    private com.google.protobuf.RepeatedFieldBuilderV3<
+        org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation, org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation.Builder, org.vdaas.vald.api.v1.rpc.QuotaFailure.ViolationOrBuilder> 
+        getViolationsFieldBuilder() {
+      if (violationsBuilder_ == null) {
+        violationsBuilder_ = new com.google.protobuf.RepeatedFieldBuilderV3<
+            org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation, org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation.Builder, org.vdaas.vald.api.v1.rpc.QuotaFailure.ViolationOrBuilder>(
+                violations_,
+                ((bitField0_ & 0x00000001) != 0),
+                getParentForChildren(),
+                isClean());
+        violations_ = null;
+      }
+      return violationsBuilder_;
+    }
+    @java.lang.Override
+    public final Builder setUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.setUnknownFields(unknownFields);
+    }
+
+    @java.lang.Override
+    public final Builder mergeUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.mergeUnknownFields(unknownFields);
+    }
+
+
+    // @@protoc_insertion_point(builder_scope:rpc.v1.QuotaFailure)
+  }
+
+  // @@protoc_insertion_point(class_scope:rpc.v1.QuotaFailure)
+  private static final org.vdaas.vald.api.v1.rpc.QuotaFailure DEFAULT_INSTANCE;
+  static {
+    DEFAULT_INSTANCE = new org.vdaas.vald.api.v1.rpc.QuotaFailure();
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.QuotaFailure getDefaultInstance() {
+    return DEFAULT_INSTANCE;
+  }
+
+  private static final com.google.protobuf.Parser
+      PARSER = new com.google.protobuf.AbstractParser() {
+    @java.lang.Override
+    public QuotaFailure parsePartialFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      Builder builder = newBuilder();
+      try {
+        builder.mergeFrom(input, extensionRegistry);
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(builder.buildPartial());
+      } catch (com.google.protobuf.UninitializedMessageException e) {
+        throw e.asInvalidProtocolBufferException().setUnfinishedMessage(builder.buildPartial());
+      } catch (java.io.IOException e) {
+        throw new com.google.protobuf.InvalidProtocolBufferException(e)
+            .setUnfinishedMessage(builder.buildPartial());
+      }
+      return builder.buildPartial();
+    }
+  };
+
+  public static com.google.protobuf.Parser parser() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.protobuf.Parser getParserForType() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public org.vdaas.vald.api.v1.rpc.QuotaFailure getDefaultInstanceForType() {
+    return DEFAULT_INSTANCE;
+  }
+
+}
+
diff --git a/src/main/java/org/vdaas/vald/api/v1/rpc/QuotaFailureOrBuilder.java b/src/main/java/org/vdaas/vald/api/v1/rpc/QuotaFailureOrBuilder.java
new file mode 100644
index 00000000..50adf17d
--- /dev/null
+++ b/src/main/java/org/vdaas/vald/api/v1/rpc/QuotaFailureOrBuilder.java
@@ -0,0 +1,53 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: apis/proto/v1/rpc/error_details.proto
+
+package org.vdaas.vald.api.v1.rpc;
+
+public interface QuotaFailureOrBuilder extends
+    // @@protoc_insertion_point(interface_extends:rpc.v1.QuotaFailure)
+    com.google.protobuf.MessageOrBuilder {
+
+  /**
+   * 
+   * Describes all quota violations.
+   * 

+   *
+   * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+   */
+  java.util.List 
+      getViolationsList();
+  /**
+   * 
+   * Describes all quota violations.
+   * 

+   *
+   * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+   */
+  org.vdaas.vald.api.v1.rpc.QuotaFailure.Violation getViolations(int index);
+  /**
+   * 
+   * Describes all quota violations.
+   * 

+   *
+   * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+   */
+  int getViolationsCount();
+  /**
+   * 
+   * Describes all quota violations.
+   * 

+   *
+   * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+   */
+  java.util.List 
+      getViolationsOrBuilderList();
+  /**
+   * 
+   * Describes all quota violations.
+   * 

+   *
+   * repeated .rpc.v1.QuotaFailure.Violation violations = 1;
+   */
+  org.vdaas.vald.api.v1.rpc.QuotaFailure.ViolationOrBuilder getViolationsOrBuilder(
+      int index);
+}
diff --git a/src/main/java/org/vdaas/vald/api/v1/rpc/RequestInfo.java b/src/main/java/org/vdaas/vald/api/v1/rpc/RequestInfo.java
new file mode 100644
index 00000000..fce68028
--- /dev/null
+++ b/src/main/java/org/vdaas/vald/api/v1/rpc/RequestInfo.java
@@ -0,0 +1,757 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: apis/proto/v1/rpc/error_details.proto
+
+package org.vdaas.vald.api.v1.rpc;
+
+/**
+ * 
+ * Contains metadata about the request that clients can attach when filing a bug
+ * or providing other forms of feedback.
+ * 

+ *
+ * Protobuf type {@code rpc.v1.RequestInfo}
+ */
+public final class RequestInfo extends
+    com.google.protobuf.GeneratedMessageV3 implements
+    // @@protoc_insertion_point(message_implements:rpc.v1.RequestInfo)
+    RequestInfoOrBuilder {
+private static final long serialVersionUID = 0L;
+  // Use RequestInfo.newBuilder() to construct.
+  private RequestInfo(com.google.protobuf.GeneratedMessageV3.Builder builder) {
+    super(builder);
+  }
+  private RequestInfo() {
+    requestId_ = "";
+    servingData_ = "";
+  }
+
+  @java.lang.Override
+  @SuppressWarnings({"unused"})
+  protected java.lang.Object newInstance(
+      UnusedPrivateParameter unused) {
+    return new RequestInfo();
+  }
+
+  public static final com.google.protobuf.Descriptors.Descriptor
+      getDescriptor() {
+    return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_RequestInfo_descriptor;
+  }
+
+  @java.lang.Override
+  protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internalGetFieldAccessorTable() {
+    return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_RequestInfo_fieldAccessorTable
+        .ensureFieldAccessorsInitialized(
+            org.vdaas.vald.api.v1.rpc.RequestInfo.class, org.vdaas.vald.api.v1.rpc.RequestInfo.Builder.class);
+  }
+
+  public static final int REQUEST_ID_FIELD_NUMBER = 1;
+  @SuppressWarnings("serial")
+  private volatile java.lang.Object requestId_ = "";
+  /**
+   * 
+   * An opaque string that should only be interpreted by the service generating
+   * it. For example, it can be used to identify requests in the service's logs.
+   * 

+   *
+   * string request_id = 1;
+   * @return The requestId.
+   */
+  @java.lang.Override
+  public java.lang.String getRequestId() {
+    java.lang.Object ref = requestId_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = 
+          (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      requestId_ = s;
+      return s;
+    }
+  }
+  /**
+   * 
+   * An opaque string that should only be interpreted by the service generating
+   * it. For example, it can be used to identify requests in the service's logs.
+   * 

+   *
+   * string request_id = 1;
+   * @return The bytes for requestId.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString
+      getRequestIdBytes() {
+    java.lang.Object ref = requestId_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b = 
+          com.google.protobuf.ByteString.copyFromUtf8(
+              (java.lang.String) ref);
+      requestId_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  public static final int SERVING_DATA_FIELD_NUMBER = 2;
+  @SuppressWarnings("serial")
+  private volatile java.lang.Object servingData_ = "";
+  /**
+   * 
+   * Any data that was used to serve this request. For example, an encrypted
+   * stack trace that can be sent back to the service provider for debugging.
+   * 

+   *
+   * string serving_data = 2;
+   * @return The servingData.
+   */
+  @java.lang.Override
+  public java.lang.String getServingData() {
+    java.lang.Object ref = servingData_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = 
+          (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      servingData_ = s;
+      return s;
+    }
+  }
+  /**
+   * 
+   * Any data that was used to serve this request. For example, an encrypted
+   * stack trace that can be sent back to the service provider for debugging.
+   * 

+   *
+   * string serving_data = 2;
+   * @return The bytes for servingData.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString
+      getServingDataBytes() {
+    java.lang.Object ref = servingData_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b = 
+          com.google.protobuf.ByteString.copyFromUtf8(
+              (java.lang.String) ref);
+      servingData_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  private byte memoizedIsInitialized = -1;
+  @java.lang.Override
+  public final boolean isInitialized() {
+    byte isInitialized = memoizedIsInitialized;
+    if (isInitialized == 1) return true;
+    if (isInitialized == 0) return false;
+
+    memoizedIsInitialized = 1;
+    return true;
+  }
+
+  @java.lang.Override
+  public void writeTo(com.google.protobuf.CodedOutputStream output)
+                      throws java.io.IOException {
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
+      com.google.protobuf.GeneratedMessageV3.writeString(output, 1, requestId_);
+    }
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(servingData_)) {
+      com.google.protobuf.GeneratedMessageV3.writeString(output, 2, servingData_);
+    }
+    getUnknownFields().writeTo(output);
+  }
+
+  @java.lang.Override
+  public int getSerializedSize() {
+    int size = memoizedSize;
+    if (size != -1) return size;
+
+    size = 0;
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
+      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(1, requestId_);
+    }
+    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(servingData_)) {
+      size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, servingData_);
+    }
+    size += getUnknownFields().getSerializedSize();
+    memoizedSize = size;
+    return size;
+  }
+
+  @java.lang.Override
+  public boolean equals(final java.lang.Object obj) {
+    if (obj == this) {
+     return true;
+    }
+    if (!(obj instanceof org.vdaas.vald.api.v1.rpc.RequestInfo)) {
+      return super.equals(obj);
+    }
+    org.vdaas.vald.api.v1.rpc.RequestInfo other = (org.vdaas.vald.api.v1.rpc.RequestInfo) obj;
+
+    if (!getRequestId()
+        .equals(other.getRequestId())) return false;
+    if (!getServingData()
+        .equals(other.getServingData())) return false;
+    if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+    return true;
+  }
+
+  @java.lang.Override
+  public int hashCode() {
+    if (memoizedHashCode != 0) {
+      return memoizedHashCode;
+    }
+    int hash = 41;
+    hash = (19 * hash) + getDescriptor().hashCode();
+    hash = (37 * hash) + REQUEST_ID_FIELD_NUMBER;
+    hash = (53 * hash) + getRequestId().hashCode();
+    hash = (37 * hash) + SERVING_DATA_FIELD_NUMBER;
+    hash = (53 * hash) + getServingData().hashCode();
+    hash = (29 * hash) + getUnknownFields().hashCode();
+    memoizedHashCode = hash;
+    return hash;
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.RequestInfo parseFrom(
+      java.nio.ByteBuffer data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.RequestInfo parseFrom(
+      java.nio.ByteBuffer data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.RequestInfo parseFrom(
+      com.google.protobuf.ByteString data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.RequestInfo parseFrom(
+      com.google.protobuf.ByteString data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.RequestInfo parseFrom(byte[] data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.RequestInfo parseFrom(
+      byte[] data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.RequestInfo parseFrom(java.io.InputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input);
+  }
+  public static org.vdaas.vald.api.v1.rpc.RequestInfo parseFrom(
+      java.io.InputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input, extensionRegistry);
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.RequestInfo parseDelimitedFrom(java.io.InputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseDelimitedWithIOException(PARSER, input);
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.RequestInfo parseDelimitedFrom(
+      java.io.InputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.RequestInfo parseFrom(
+      com.google.protobuf.CodedInputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input);
+  }
+  public static org.vdaas.vald.api.v1.rpc.RequestInfo parseFrom(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input, extensionRegistry);
+  }
+
+  @java.lang.Override
+  public Builder newBuilderForType() { return newBuilder(); }
+  public static Builder newBuilder() {
+    return DEFAULT_INSTANCE.toBuilder();
+  }
+  public static Builder newBuilder(org.vdaas.vald.api.v1.rpc.RequestInfo prototype) {
+    return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+  }
+  @java.lang.Override
+  public Builder toBuilder() {
+    return this == DEFAULT_INSTANCE
+        ? new Builder() : new Builder().mergeFrom(this);
+  }
+
+  @java.lang.Override
+  protected Builder newBuilderForType(
+      com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+    Builder builder = new Builder(parent);
+    return builder;
+  }
+  /**
+   * 
+   * Contains metadata about the request that clients can attach when filing a bug
+   * or providing other forms of feedback.
+   * 

+   *
+   * Protobuf type {@code rpc.v1.RequestInfo}
+   */
+  public static final class Builder extends
+      com.google.protobuf.GeneratedMessageV3.Builder implements
+      // @@protoc_insertion_point(builder_implements:rpc.v1.RequestInfo)
+      org.vdaas.vald.api.v1.rpc.RequestInfoOrBuilder {
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_RequestInfo_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_RequestInfo_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              org.vdaas.vald.api.v1.rpc.RequestInfo.class, org.vdaas.vald.api.v1.rpc.RequestInfo.Builder.class);
+    }
+
+    // Construct using org.vdaas.vald.api.v1.rpc.RequestInfo.newBuilder()
+    private Builder() {
+
+    }
+
+    private Builder(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      super(parent);
+
+    }
+    @java.lang.Override
+    public Builder clear() {
+      super.clear();
+      bitField0_ = 0;
+      requestId_ = "";
+      servingData_ = "";
+      return this;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.Descriptor
+        getDescriptorForType() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_RequestInfo_descriptor;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.RequestInfo getDefaultInstanceForType() {
+      return org.vdaas.vald.api.v1.rpc.RequestInfo.getDefaultInstance();
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.RequestInfo build() {
+      org.vdaas.vald.api.v1.rpc.RequestInfo result = buildPartial();
+      if (!result.isInitialized()) {
+        throw newUninitializedMessageException(result);
+      }
+      return result;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.RequestInfo buildPartial() {
+      org.vdaas.vald.api.v1.rpc.RequestInfo result = new org.vdaas.vald.api.v1.rpc.RequestInfo(this);
+      if (bitField0_ != 0) { buildPartial0(result); }
+      onBuilt();
+      return result;
+    }
+
+    private void buildPartial0(org.vdaas.vald.api.v1.rpc.RequestInfo result) {
+      int from_bitField0_ = bitField0_;
+      if (((from_bitField0_ & 0x00000001) != 0)) {
+        result.requestId_ = requestId_;
+      }
+      if (((from_bitField0_ & 0x00000002) != 0)) {
+        result.servingData_ = servingData_;
+      }
+    }
+
+    @java.lang.Override
+    public Builder clone() {
+      return super.clone();
+    }
+    @java.lang.Override
+    public Builder setField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        java.lang.Object value) {
+      return super.setField(field, value);
+    }
+    @java.lang.Override
+    public Builder clearField(
+        com.google.protobuf.Descriptors.FieldDescriptor field) {
+      return super.clearField(field);
+    }
+    @java.lang.Override
+    public Builder clearOneof(
+        com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+      return super.clearOneof(oneof);
+    }
+    @java.lang.Override
+    public Builder setRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        int index, java.lang.Object value) {
+      return super.setRepeatedField(field, index, value);
+    }
+    @java.lang.Override
+    public Builder addRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        java.lang.Object value) {
+      return super.addRepeatedField(field, value);
+    }
+    @java.lang.Override
+    public Builder mergeFrom(com.google.protobuf.Message other) {
+      if (other instanceof org.vdaas.vald.api.v1.rpc.RequestInfo) {
+        return mergeFrom((org.vdaas.vald.api.v1.rpc.RequestInfo)other);
+      } else {
+        super.mergeFrom(other);
+        return this;
+      }
+    }
+
+    public Builder mergeFrom(org.vdaas.vald.api.v1.rpc.RequestInfo other) {
+      if (other == org.vdaas.vald.api.v1.rpc.RequestInfo.getDefaultInstance()) return this;
+      if (!other.getRequestId().isEmpty()) {
+        requestId_ = other.requestId_;
+        bitField0_ |= 0x00000001;
+        onChanged();
+      }
+      if (!other.getServingData().isEmpty()) {
+        servingData_ = other.servingData_;
+        bitField0_ |= 0x00000002;
+        onChanged();
+      }
+      this.mergeUnknownFields(other.getUnknownFields());
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      return true;
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      if (extensionRegistry == null) {
+        throw new java.lang.NullPointerException();
+      }
+      try {
+        boolean done = false;
+        while (!done) {
+          int tag = input.readTag();
+          switch (tag) {
+            case 0:
+              done = true;
+              break;
+            case 10: {
+              requestId_ = input.readStringRequireUtf8();
+              bitField0_ |= 0x00000001;
+              break;
+            } // case 10
+            case 18: {
+              servingData_ = input.readStringRequireUtf8();
+              bitField0_ |= 0x00000002;
+              break;
+            } // case 18
+            default: {
+              if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                done = true; // was an endgroup tag
+              }
+              break;
+            } // default:
+          } // switch (tag)
+        } // while (!done)
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.unwrapIOException();
+      } finally {
+        onChanged();
+      } // finally
+      return this;
+    }
+    private int bitField0_;
+
+    private java.lang.Object requestId_ = "";
+    /**
+     * 
+     * An opaque string that should only be interpreted by the service generating
+     * it. For example, it can be used to identify requests in the service's logs.
+     * 

+     *
+     * string request_id = 1;
+     * @return The requestId.
+     */
+    public java.lang.String getRequestId() {
+      java.lang.Object ref = requestId_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs =
+            (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        requestId_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     * 
+     * An opaque string that should only be interpreted by the service generating
+     * it. For example, it can be used to identify requests in the service's logs.
+     * 

+     *
+     * string request_id = 1;
+     * @return The bytes for requestId.
+     */
+    public com.google.protobuf.ByteString
+        getRequestIdBytes() {
+      java.lang.Object ref = requestId_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b = 
+            com.google.protobuf.ByteString.copyFromUtf8(
+                (java.lang.String) ref);
+        requestId_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     * 
+     * An opaque string that should only be interpreted by the service generating
+     * it. For example, it can be used to identify requests in the service's logs.
+     * 

+     *
+     * string request_id = 1;
+     * @param value The requestId to set.
+     * @return This builder for chaining.
+     */
+    public Builder setRequestId(
+        java.lang.String value) {
+      if (value == null) { throw new NullPointerException(); }
+      requestId_ = value;
+      bitField0_ |= 0x00000001;
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * An opaque string that should only be interpreted by the service generating
+     * it. For example, it can be used to identify requests in the service's logs.
+     * 

+     *
+     * string request_id = 1;
+     * @return This builder for chaining.
+     */
+    public Builder clearRequestId() {
+      requestId_ = getDefaultInstance().getRequestId();
+      bitField0_ = (bitField0_ & ~0x00000001);
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * An opaque string that should only be interpreted by the service generating
+     * it. For example, it can be used to identify requests in the service's logs.
+     * 

+     *
+     * string request_id = 1;
+     * @param value The bytes for requestId to set.
+     * @return This builder for chaining.
+     */
+    public Builder setRequestIdBytes(
+        com.google.protobuf.ByteString value) {
+      if (value == null) { throw new NullPointerException(); }
+      checkByteStringIsUtf8(value);
+      requestId_ = value;
+      bitField0_ |= 0x00000001;
+      onChanged();
+      return this;
+    }
+
+    private java.lang.Object servingData_ = "";
+    /**
+     * 
+     * Any data that was used to serve this request. For example, an encrypted
+     * stack trace that can be sent back to the service provider for debugging.
+     * 

+     *
+     * string serving_data = 2;
+     * @return The servingData.
+     */
+    public java.lang.String getServingData() {
+      java.lang.Object ref = servingData_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs =
+            (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        servingData_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     * 
+     * Any data that was used to serve this request. For example, an encrypted
+     * stack trace that can be sent back to the service provider for debugging.
+     * 

+     *
+     * string serving_data = 2;
+     * @return The bytes for servingData.
+     */
+    public com.google.protobuf.ByteString
+        getServingDataBytes() {
+      java.lang.Object ref = servingData_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b = 
+            com.google.protobuf.ByteString.copyFromUtf8(
+                (java.lang.String) ref);
+        servingData_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     * 
+     * Any data that was used to serve this request. For example, an encrypted
+     * stack trace that can be sent back to the service provider for debugging.
+     * 

+     *
+     * string serving_data = 2;
+     * @param value The servingData to set.
+     * @return This builder for chaining.
+     */
+    public Builder setServingData(
+        java.lang.String value) {
+      if (value == null) { throw new NullPointerException(); }
+      servingData_ = value;
+      bitField0_ |= 0x00000002;
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * Any data that was used to serve this request. For example, an encrypted
+     * stack trace that can be sent back to the service provider for debugging.
+     * 

+     *
+     * string serving_data = 2;
+     * @return This builder for chaining.
+     */
+    public Builder clearServingData() {
+      servingData_ = getDefaultInstance().getServingData();
+      bitField0_ = (bitField0_ & ~0x00000002);
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * Any data that was used to serve this request. For example, an encrypted
+     * stack trace that can be sent back to the service provider for debugging.
+     * 

+     *
+     * string serving_data = 2;
+     * @param value The bytes for servingData to set.
+     * @return This builder for chaining.
+     */
+    public Builder setServingDataBytes(
+        com.google.protobuf.ByteString value) {
+      if (value == null) { throw new NullPointerException(); }
+      checkByteStringIsUtf8(value);
+      servingData_ = value;
+      bitField0_ |= 0x00000002;
+      onChanged();
+      return this;
+    }
+    @java.lang.Override
+    public final Builder setUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.setUnknownFields(unknownFields);
+    }
+
+    @java.lang.Override
+    public final Builder mergeUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.mergeUnknownFields(unknownFields);
+    }
+
+
+    // @@protoc_insertion_point(builder_scope:rpc.v1.RequestInfo)
+  }
+
+  // @@protoc_insertion_point(class_scope:rpc.v1.RequestInfo)
+  private static final org.vdaas.vald.api.v1.rpc.RequestInfo DEFAULT_INSTANCE;
+  static {
+    DEFAULT_INSTANCE = new org.vdaas.vald.api.v1.rpc.RequestInfo();
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.RequestInfo getDefaultInstance() {
+    return DEFAULT_INSTANCE;
+  }
+
+  private static final com.google.protobuf.Parser
+      PARSER = new com.google.protobuf.AbstractParser() {
+    @java.lang.Override
+    public RequestInfo parsePartialFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      Builder builder = newBuilder();
+      try {
+        builder.mergeFrom(input, extensionRegistry);
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(builder.buildPartial());
+      } catch (com.google.protobuf.UninitializedMessageException e) {
+        throw e.asInvalidProtocolBufferException().setUnfinishedMessage(builder.buildPartial());
+      } catch (java.io.IOException e) {
+        throw new com.google.protobuf.InvalidProtocolBufferException(e)
+            .setUnfinishedMessage(builder.buildPartial());
+      }
+      return builder.buildPartial();
+    }
+  };
+
+  public static com.google.protobuf.Parser parser() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.protobuf.Parser getParserForType() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public org.vdaas.vald.api.v1.rpc.RequestInfo getDefaultInstanceForType() {
+    return DEFAULT_INSTANCE;
+  }
+
+}
+
diff --git a/src/main/java/org/vdaas/vald/api/v1/rpc/RequestInfoOrBuilder.java b/src/main/java/org/vdaas/vald/api/v1/rpc/RequestInfoOrBuilder.java
new file mode 100644
index 00000000..5f261410
--- /dev/null
+++ b/src/main/java/org/vdaas/vald/api/v1/rpc/RequestInfoOrBuilder.java
@@ -0,0 +1,53 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: apis/proto/v1/rpc/error_details.proto
+
+package org.vdaas.vald.api.v1.rpc;
+
+public interface RequestInfoOrBuilder extends
+    // @@protoc_insertion_point(interface_extends:rpc.v1.RequestInfo)
+    com.google.protobuf.MessageOrBuilder {
+
+  /**
+   * 
+   * An opaque string that should only be interpreted by the service generating
+   * it. For example, it can be used to identify requests in the service's logs.
+   * 

+   *
+   * string request_id = 1;
+   * @return The requestId.
+   */
+  java.lang.String getRequestId();
+  /**
+   * 
+   * An opaque string that should only be interpreted by the service generating
+   * it. For example, it can be used to identify requests in the service's logs.
+   * 

+   *
+   * string request_id = 1;
+   * @return The bytes for requestId.
+   */
+  com.google.protobuf.ByteString
+      getRequestIdBytes();
+
+  /**
+   * 
+   * Any data that was used to serve this request. For example, an encrypted
+   * stack trace that can be sent back to the service provider for debugging.
+   * 

+   *
+   * string serving_data = 2;
+   * @return The servingData.
+   */
+  java.lang.String getServingData();
+  /**
+   * 
+   * Any data that was used to serve this request. For example, an encrypted
+   * stack trace that can be sent back to the service provider for debugging.
+   * 

+   *
+   * string serving_data = 2;
+   * @return The bytes for servingData.
+   */
+  com.google.protobuf.ByteString
+      getServingDataBytes();
+}
diff --git a/src/main/java/org/vdaas/vald/api/v1/rpc/ResourceInfo.java b/src/main/java/org/vdaas/vald/api/v1/rpc/ResourceInfo.java
new file mode 100644
index 00000000..1338f7b1
--- /dev/null
+++ b/src/main/java/org/vdaas/vald/api/v1/rpc/ResourceInfo.java
@@ -0,0 +1,1132 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: apis/proto/v1/rpc/error_details.proto
+
+package org.vdaas.vald.api.v1.rpc;
+
+/**
+ * 
+ * Describes the resource that is being accessed.
+ * 

+ *
+ * Protobuf type {@code rpc.v1.ResourceInfo}
+ */
+public final class ResourceInfo extends
+    com.google.protobuf.GeneratedMessageV3 implements
+    // @@protoc_insertion_point(message_implements:rpc.v1.ResourceInfo)
+    ResourceInfoOrBuilder {
+private static final long serialVersionUID = 0L;
+  // Use ResourceInfo.newBuilder() to construct.
+  private ResourceInfo(com.google.protobuf.GeneratedMessageV3.Builder builder) {
+    super(builder);
+  }
+  private ResourceInfo() {
+    resourceType_ = "";
+    resourceName_ = "";
+    owner_ = "";
+    description_ = "";
+  }
+
+  @java.lang.Override
+  @SuppressWarnings({"unused"})
+  protected java.lang.Object newInstance(
+      UnusedPrivateParameter unused) {
+    return new ResourceInfo();
+  }
+
+  public static final com.google.protobuf.Descriptors.Descriptor
+      getDescriptor() {
+    return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_ResourceInfo_descriptor;
+  }
+
+  @java.lang.Override
+  protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internalGetFieldAccessorTable() {
+    return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_ResourceInfo_fieldAccessorTable
+        .ensureFieldAccessorsInitialized(
+            org.vdaas.vald.api.v1.rpc.ResourceInfo.class, org.vdaas.vald.api.v1.rpc.ResourceInfo.Builder.class);
+  }
+
+  public static final int RESOURCE_TYPE_FIELD_NUMBER = 1;
+  @SuppressWarnings("serial")
+  private volatile java.lang.Object resourceType_ = "";
+  /**
+   * 
+   * A name for the type of resource being accessed, e.g. "sql table",
+   * "cloud storage bucket", "file", "Google calendar"; or the type URL
+   * of the resource: e.g. "type.googleapis.com/google.pubsub.v1.Topic".
+   * 

+   *
+   * string resource_type = 1;
+   * @return The resourceType.
+   */
+  @java.lang.Override
+  public java.lang.String getResourceType() {
+    java.lang.Object ref = resourceType_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = 
+          (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      resourceType_ = s;
+      return s;
+    }
+  }
+  /**
+   * 
+   * A name for the type of resource being accessed, e.g. "sql table",
+   * "cloud storage bucket", "file", "Google calendar"; or the type URL
+   * of the resource: e.g. "type.googleapis.com/google.pubsub.v1.Topic".
+   * 

+   *
+   * string resource_type = 1;
+   * @return The bytes for resourceType.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString
+      getResourceTypeBytes() {
+    java.lang.Object ref = resourceType_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b = 
+          com.google.protobuf.ByteString.copyFromUtf8(
+              (java.lang.String) ref);
+      resourceType_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  public static final int RESOURCE_NAME_FIELD_NUMBER = 2;
+  @SuppressWarnings("serial")
+  private volatile java.lang.Object resourceName_ = "";
+  /**
+   * 
+   * The name of the resource being accessed.  For example, a shared calendar
+   * name: "example.com_4fghdhgsrgh@group.calendar.google.com", if the current
+   * error is
+   * [google.rpc.Code.PERMISSION_DENIED][google.rpc.Code.PERMISSION_DENIED].
+   * 

+   *
+   * string resource_name = 2;
+   * @return The resourceName.
+   */
+  @java.lang.Override
+  public java.lang.String getResourceName() {
+    java.lang.Object ref = resourceName_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = 
+          (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      resourceName_ = s;
+      return s;
+    }
+  }
+  /**
+   * 
+   * The name of the resource being accessed.  For example, a shared calendar
+   * name: "example.com_4fghdhgsrgh@group.calendar.google.com", if the current
+   * error is
+   * [google.rpc.Code.PERMISSION_DENIED][google.rpc.Code.PERMISSION_DENIED].
+   * 

+   *
+   * string resource_name = 2;
+   * @return The bytes for resourceName.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString
+      getResourceNameBytes() {
+    java.lang.Object ref = resourceName_;
+    if (ref instanceof java.lang.String) {
+      com.google.protobuf.ByteString b = 
+          com.google.protobuf.ByteString.copyFromUtf8(
+              (java.lang.String) ref);
+      resourceName_ = b;
+      return b;
+    } else {
+      return (com.google.protobuf.ByteString) ref;
+    }
+  }
+
+  public static final int OWNER_FIELD_NUMBER = 3;
+  @SuppressWarnings("serial")
+  private volatile java.lang.Object owner_ = "";
+  /**
+   * 
+   * The owner of the resource (optional).
+   * For example, "user:<owner email>" or "project:<Google developer project
+   * id>".
+   * 

+   *
+   * string owner = 3;
+   * @return The owner.
+   */
+  @java.lang.Override
+  public java.lang.String getOwner() {
+    java.lang.Object ref = owner_;
+    if (ref instanceof java.lang.String) {
+      return (java.lang.String) ref;
+    } else {
+      com.google.protobuf.ByteString bs = 
+          (com.google.protobuf.ByteString) ref;
+      java.lang.String s = bs.toStringUtf8();
+      owner_ = s;
+      return s;
+    }
+  }
+  /**
+   * 
+   * The owner of the resource (optional).
+   * For example, "user:<owner email>" or "project:<Google developer project
+   * id>".
+   * 

+   *
+   * string owner = 3;
+   * @return The bytes for owner.
+   */
+  @java.lang.Override
+  public com.google.protobuf.ByteString
+      getOwnerBytes() {
+    java.lang.Object ref = owner_;
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+   * For example, updating a cloud project may require the `writer` permission
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+   * Describes what error is encountered when accessing this resource.
+   * For example, updating a cloud project may require the `writer` permission
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+  public boolean equals(final java.lang.Object obj) {
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+    if (!getDescription()
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+  public int hashCode() {
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+      java.nio.ByteBuffer data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
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+  public static org.vdaas.vald.api.v1.rpc.ResourceInfo parseFrom(
+      java.nio.ByteBuffer data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
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+  public static org.vdaas.vald.api.v1.rpc.ResourceInfo parseFrom(
+      com.google.protobuf.ByteString data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
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+  public static org.vdaas.vald.api.v1.rpc.ResourceInfo parseFrom(
+      com.google.protobuf.ByteString data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
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+  public static org.vdaas.vald.api.v1.rpc.ResourceInfo parseFrom(byte[] data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.ResourceInfo parseFrom(
+      byte[] data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
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+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
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+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input, extensionRegistry);
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+  public static org.vdaas.vald.api.v1.rpc.ResourceInfo parseDelimitedFrom(java.io.InputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseDelimitedWithIOException(PARSER, input);
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+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
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+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input);
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+  public static org.vdaas.vald.api.v1.rpc.ResourceInfo parseFrom(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
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+  @java.lang.Override
+  public Builder newBuilderForType() { return newBuilder(); }
+  public static Builder newBuilder() {
+    return DEFAULT_INSTANCE.toBuilder();
+  }
+  public static Builder newBuilder(org.vdaas.vald.api.v1.rpc.ResourceInfo prototype) {
+    return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+  }
+  @java.lang.Override
+  public Builder toBuilder() {
+    return this == DEFAULT_INSTANCE
+        ? new Builder() : new Builder().mergeFrom(this);
+  }
+
+  @java.lang.Override
+  protected Builder newBuilderForType(
+      com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+    Builder builder = new Builder(parent);
+    return builder;
+  }
+  /**
+   * 
+   * Describes the resource that is being accessed.
+   * 

+   *
+   * Protobuf type {@code rpc.v1.ResourceInfo}
+   */
+  public static final class Builder extends
+      com.google.protobuf.GeneratedMessageV3.Builder implements
+      // @@protoc_insertion_point(builder_implements:rpc.v1.ResourceInfo)
+      org.vdaas.vald.api.v1.rpc.ResourceInfoOrBuilder {
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_ResourceInfo_descriptor;
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+    // Construct using org.vdaas.vald.api.v1.rpc.ResourceInfo.newBuilder()
+    private Builder() {
+
+    }
+
+    private Builder(
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+    }
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+      resourceType_ = "";
+      resourceName_ = "";
+      owner_ = "";
+      description_ = "";
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+    public com.google.protobuf.Descriptors.Descriptor
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+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_ResourceInfo_descriptor;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.ResourceInfo getDefaultInstanceForType() {
+      return org.vdaas.vald.api.v1.rpc.ResourceInfo.getDefaultInstance();
+    }
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+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.ResourceInfo build() {
+      org.vdaas.vald.api.v1.rpc.ResourceInfo result = buildPartial();
+      if (!result.isInitialized()) {
+        throw newUninitializedMessageException(result);
+      }
+      return result;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.ResourceInfo buildPartial() {
+      org.vdaas.vald.api.v1.rpc.ResourceInfo result = new org.vdaas.vald.api.v1.rpc.ResourceInfo(this);
+      if (bitField0_ != 0) { buildPartial0(result); }
+      onBuilt();
+      return result;
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+
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+    public Builder clone() {
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+    public Builder setField(
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+    @java.lang.Override
+    public Builder clearField(
+        com.google.protobuf.Descriptors.FieldDescriptor field) {
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+    @java.lang.Override
+    public Builder clearOneof(
+        com.google.protobuf.Descriptors.OneofDescriptor oneof) {
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+    public Builder addRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        java.lang.Object value) {
+      return super.addRepeatedField(field, value);
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+    @java.lang.Override
+    public Builder mergeFrom(com.google.protobuf.Message other) {
+      if (other instanceof org.vdaas.vald.api.v1.rpc.ResourceInfo) {
+        return mergeFrom((org.vdaas.vald.api.v1.rpc.ResourceInfo)other);
+      } else {
+        super.mergeFrom(other);
+        return this;
+      }
+    }
+
+    public Builder mergeFrom(org.vdaas.vald.api.v1.rpc.ResourceInfo other) {
+      if (other == org.vdaas.vald.api.v1.rpc.ResourceInfo.getDefaultInstance()) return this;
+      if (!other.getResourceType().isEmpty()) {
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+        bitField0_ |= 0x00000001;
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+      if (!other.getResourceName().isEmpty()) {
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+      return this;
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+    @java.lang.Override
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+
+    @java.lang.Override
+    public Builder mergeFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      if (extensionRegistry == null) {
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+      try {
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+              break;
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+              break;
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+            case 18: {
+              resourceName_ = input.readStringRequireUtf8();
+              bitField0_ |= 0x00000002;
+              break;
+            } // case 18
+            case 26: {
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+              bitField0_ |= 0x00000004;
+              break;
+            } // case 26
+            case 34: {
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+              bitField0_ |= 0x00000008;
+              break;
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+      return this;
+    }
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+    private java.lang.Object resourceType_ = "";
+    /**
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+     * A name for the type of resource being accessed, e.g. "sql table",
+     * "cloud storage bucket", "file", "Google calendar"; or the type URL
+     * of the resource: e.g. "type.googleapis.com/google.pubsub.v1.Topic".
+     * 

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+     * A name for the type of resource being accessed, e.g. "sql table",
+     * "cloud storage bucket", "file", "Google calendar"; or the type URL
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+     * 

+     *
+     * string resource_type = 1;
+     * @return The bytes for resourceType.
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+    public com.google.protobuf.ByteString
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+      java.lang.Object ref = resourceType_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b = 
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+        resourceType_ = b;
+        return b;
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+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     * 
+     * A name for the type of resource being accessed, e.g. "sql table",
+     * "cloud storage bucket", "file", "Google calendar"; or the type URL
+     * of the resource: e.g. "type.googleapis.com/google.pubsub.v1.Topic".
+     * 

+     *
+     * string resource_type = 1;
+     * @param value The resourceType to set.
+     * @return This builder for chaining.
+     */
+    public Builder setResourceType(
+        java.lang.String value) {
+      if (value == null) { throw new NullPointerException(); }
+      resourceType_ = value;
+      bitField0_ |= 0x00000001;
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * A name for the type of resource being accessed, e.g. "sql table",
+     * "cloud storage bucket", "file", "Google calendar"; or the type URL
+     * of the resource: e.g. "type.googleapis.com/google.pubsub.v1.Topic".
+     * 

+     *
+     * string resource_type = 1;
+     * @return This builder for chaining.
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+    public Builder clearResourceType() {
+      resourceType_ = getDefaultInstance().getResourceType();
+      bitField0_ = (bitField0_ & ~0x00000001);
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * A name for the type of resource being accessed, e.g. "sql table",
+     * "cloud storage bucket", "file", "Google calendar"; or the type URL
+     * of the resource: e.g. "type.googleapis.com/google.pubsub.v1.Topic".
+     * 

+     *
+     * string resource_type = 1;
+     * @param value The bytes for resourceType to set.
+     * @return This builder for chaining.
+     */
+    public Builder setResourceTypeBytes(
+        com.google.protobuf.ByteString value) {
+      if (value == null) { throw new NullPointerException(); }
+      checkByteStringIsUtf8(value);
+      resourceType_ = value;
+      bitField0_ |= 0x00000001;
+      onChanged();
+      return this;
+    }
+
+    private java.lang.Object resourceName_ = "";
+    /**
+     * 
+     * The name of the resource being accessed.  For example, a shared calendar
+     * name: "example.com_4fghdhgsrgh@group.calendar.google.com", if the current
+     * error is
+     * [google.rpc.Code.PERMISSION_DENIED][google.rpc.Code.PERMISSION_DENIED].
+     * 

+     *
+     * string resource_name = 2;
+     * @return The resourceName.
+     */
+    public java.lang.String getResourceName() {
+      java.lang.Object ref = resourceName_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs =
+            (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        resourceName_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     * 
+     * The name of the resource being accessed.  For example, a shared calendar
+     * name: "example.com_4fghdhgsrgh@group.calendar.google.com", if the current
+     * error is
+     * [google.rpc.Code.PERMISSION_DENIED][google.rpc.Code.PERMISSION_DENIED].
+     * 

+     *
+     * string resource_name = 2;
+     * @return The bytes for resourceName.
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+    public com.google.protobuf.ByteString
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+      java.lang.Object ref = resourceName_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b = 
+            com.google.protobuf.ByteString.copyFromUtf8(
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+        resourceName_ = b;
+        return b;
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+     * 
+     * The name of the resource being accessed.  For example, a shared calendar
+     * name: "example.com_4fghdhgsrgh@group.calendar.google.com", if the current
+     * error is
+     * [google.rpc.Code.PERMISSION_DENIED][google.rpc.Code.PERMISSION_DENIED].
+     * 

+     *
+     * string resource_name = 2;
+     * @param value The resourceName to set.
+     * @return This builder for chaining.
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+    public Builder setResourceName(
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+      if (value == null) { throw new NullPointerException(); }
+      resourceName_ = value;
+      bitField0_ |= 0x00000002;
+      onChanged();
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+     * The name of the resource being accessed.  For example, a shared calendar
+     * name: "example.com_4fghdhgsrgh@group.calendar.google.com", if the current
+     * error is
+     * [google.rpc.Code.PERMISSION_DENIED][google.rpc.Code.PERMISSION_DENIED].
+     * 

+     *
+     * string resource_name = 2;
+     * @return This builder for chaining.
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+    public Builder clearResourceName() {
+      resourceName_ = getDefaultInstance().getResourceName();
+      bitField0_ = (bitField0_ & ~0x00000002);
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * The name of the resource being accessed.  For example, a shared calendar
+     * name: "example.com_4fghdhgsrgh@group.calendar.google.com", if the current
+     * error is
+     * [google.rpc.Code.PERMISSION_DENIED][google.rpc.Code.PERMISSION_DENIED].
+     * 

+     *
+     * string resource_name = 2;
+     * @param value The bytes for resourceName to set.
+     * @return This builder for chaining.
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+    public Builder setResourceNameBytes(
+        com.google.protobuf.ByteString value) {
+      if (value == null) { throw new NullPointerException(); }
+      checkByteStringIsUtf8(value);
+      resourceName_ = value;
+      bitField0_ |= 0x00000002;
+      onChanged();
+      return this;
+    }
+
+    private java.lang.Object owner_ = "";
+    /**
+     * 
+     * The owner of the resource (optional).
+     * For example, "user:<owner email>" or "project:<Google developer project
+     * id>".
+     * 

+     *
+     * string owner = 3;
+     * @return The owner.
+     */
+    public java.lang.String getOwner() {
+      java.lang.Object ref = owner_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs =
+            (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        owner_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     * 
+     * The owner of the resource (optional).
+     * For example, "user:<owner email>" or "project:<Google developer project
+     * id>".
+     * 

+     *
+     * string owner = 3;
+     * @return The bytes for owner.
+     */
+    public com.google.protobuf.ByteString
+        getOwnerBytes() {
+      java.lang.Object ref = owner_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b = 
+            com.google.protobuf.ByteString.copyFromUtf8(
+                (java.lang.String) ref);
+        owner_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     * 
+     * The owner of the resource (optional).
+     * For example, "user:<owner email>" or "project:<Google developer project
+     * id>".
+     * 

+     *
+     * string owner = 3;
+     * @param value The owner to set.
+     * @return This builder for chaining.
+     */
+    public Builder setOwner(
+        java.lang.String value) {
+      if (value == null) { throw new NullPointerException(); }
+      owner_ = value;
+      bitField0_ |= 0x00000004;
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * The owner of the resource (optional).
+     * For example, "user:<owner email>" or "project:<Google developer project
+     * id>".
+     * 

+     *
+     * string owner = 3;
+     * @return This builder for chaining.
+     */
+    public Builder clearOwner() {
+      owner_ = getDefaultInstance().getOwner();
+      bitField0_ = (bitField0_ & ~0x00000004);
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * The owner of the resource (optional).
+     * For example, "user:<owner email>" or "project:<Google developer project
+     * id>".
+     * 

+     *
+     * string owner = 3;
+     * @param value The bytes for owner to set.
+     * @return This builder for chaining.
+     */
+    public Builder setOwnerBytes(
+        com.google.protobuf.ByteString value) {
+      if (value == null) { throw new NullPointerException(); }
+      checkByteStringIsUtf8(value);
+      owner_ = value;
+      bitField0_ |= 0x00000004;
+      onChanged();
+      return this;
+    }
+
+    private java.lang.Object description_ = "";
+    /**
+     * 
+     * Describes what error is encountered when accessing this resource.
+     * For example, updating a cloud project may require the `writer` permission
+     * on the developer console project.
+     * 

+     *
+     * string description = 4;
+     * @return The description.
+     */
+    public java.lang.String getDescription() {
+      java.lang.Object ref = description_;
+      if (!(ref instanceof java.lang.String)) {
+        com.google.protobuf.ByteString bs =
+            (com.google.protobuf.ByteString) ref;
+        java.lang.String s = bs.toStringUtf8();
+        description_ = s;
+        return s;
+      } else {
+        return (java.lang.String) ref;
+      }
+    }
+    /**
+     * 
+     * Describes what error is encountered when accessing this resource.
+     * For example, updating a cloud project may require the `writer` permission
+     * on the developer console project.
+     * 

+     *
+     * string description = 4;
+     * @return The bytes for description.
+     */
+    public com.google.protobuf.ByteString
+        getDescriptionBytes() {
+      java.lang.Object ref = description_;
+      if (ref instanceof String) {
+        com.google.protobuf.ByteString b = 
+            com.google.protobuf.ByteString.copyFromUtf8(
+                (java.lang.String) ref);
+        description_ = b;
+        return b;
+      } else {
+        return (com.google.protobuf.ByteString) ref;
+      }
+    }
+    /**
+     * 
+     * Describes what error is encountered when accessing this resource.
+     * For example, updating a cloud project may require the `writer` permission
+     * on the developer console project.
+     * 

+     *
+     * string description = 4;
+     * @param value The description to set.
+     * @return This builder for chaining.
+     */
+    public Builder setDescription(
+        java.lang.String value) {
+      if (value == null) { throw new NullPointerException(); }
+      description_ = value;
+      bitField0_ |= 0x00000008;
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * Describes what error is encountered when accessing this resource.
+     * For example, updating a cloud project may require the `writer` permission
+     * on the developer console project.
+     * 

+     *
+     * string description = 4;
+     * @return This builder for chaining.
+     */
+    public Builder clearDescription() {
+      description_ = getDefaultInstance().getDescription();
+      bitField0_ = (bitField0_ & ~0x00000008);
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * Describes what error is encountered when accessing this resource.
+     * For example, updating a cloud project may require the `writer` permission
+     * on the developer console project.
+     * 

+     *
+     * string description = 4;
+     * @param value The bytes for description to set.
+     * @return This builder for chaining.
+     */
+    public Builder setDescriptionBytes(
+        com.google.protobuf.ByteString value) {
+      if (value == null) { throw new NullPointerException(); }
+      checkByteStringIsUtf8(value);
+      description_ = value;
+      bitField0_ |= 0x00000008;
+      onChanged();
+      return this;
+    }
+    @java.lang.Override
+    public final Builder setUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.setUnknownFields(unknownFields);
+    }
+
+    @java.lang.Override
+    public final Builder mergeUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.mergeUnknownFields(unknownFields);
+    }
+
+
+    // @@protoc_insertion_point(builder_scope:rpc.v1.ResourceInfo)
+  }
+
+  // @@protoc_insertion_point(class_scope:rpc.v1.ResourceInfo)
+  private static final org.vdaas.vald.api.v1.rpc.ResourceInfo DEFAULT_INSTANCE;
+  static {
+    DEFAULT_INSTANCE = new org.vdaas.vald.api.v1.rpc.ResourceInfo();
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.ResourceInfo getDefaultInstance() {
+    return DEFAULT_INSTANCE;
+  }
+
+  private static final com.google.protobuf.Parser
+      PARSER = new com.google.protobuf.AbstractParser() {
+    @java.lang.Override
+    public ResourceInfo parsePartialFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      Builder builder = newBuilder();
+      try {
+        builder.mergeFrom(input, extensionRegistry);
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(builder.buildPartial());
+      } catch (com.google.protobuf.UninitializedMessageException e) {
+        throw e.asInvalidProtocolBufferException().setUnfinishedMessage(builder.buildPartial());
+      } catch (java.io.IOException e) {
+        throw new com.google.protobuf.InvalidProtocolBufferException(e)
+            .setUnfinishedMessage(builder.buildPartial());
+      }
+      return builder.buildPartial();
+    }
+  };
+
+  public static com.google.protobuf.Parser parser() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.protobuf.Parser getParserForType() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public org.vdaas.vald.api.v1.rpc.ResourceInfo getDefaultInstanceForType() {
+    return DEFAULT_INSTANCE;
+  }
+
+}
+
diff --git a/src/main/java/org/vdaas/vald/api/v1/rpc/ResourceInfoOrBuilder.java b/src/main/java/org/vdaas/vald/api/v1/rpc/ResourceInfoOrBuilder.java
new file mode 100644
index 00000000..90e9033b
--- /dev/null
+++ b/src/main/java/org/vdaas/vald/api/v1/rpc/ResourceInfoOrBuilder.java
@@ -0,0 +1,107 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: apis/proto/v1/rpc/error_details.proto
+
+package org.vdaas.vald.api.v1.rpc;
+
+public interface ResourceInfoOrBuilder extends
+    // @@protoc_insertion_point(interface_extends:rpc.v1.ResourceInfo)
+    com.google.protobuf.MessageOrBuilder {
+
+  /**
+   * 
+   * A name for the type of resource being accessed, e.g. "sql table",
+   * "cloud storage bucket", "file", "Google calendar"; or the type URL
+   * of the resource: e.g. "type.googleapis.com/google.pubsub.v1.Topic".
+   * 

+   *
+   * string resource_type = 1;
+   * @return The resourceType.
+   */
+  java.lang.String getResourceType();
+  /**
+   * 
+   * A name for the type of resource being accessed, e.g. "sql table",
+   * "cloud storage bucket", "file", "Google calendar"; or the type URL
+   * of the resource: e.g. "type.googleapis.com/google.pubsub.v1.Topic".
+   * 

+   *
+   * string resource_type = 1;
+   * @return The bytes for resourceType.
+   */
+  com.google.protobuf.ByteString
+      getResourceTypeBytes();
+
+  /**
+   * 
+   * The name of the resource being accessed.  For example, a shared calendar
+   * name: "example.com_4fghdhgsrgh@group.calendar.google.com", if the current
+   * error is
+   * [google.rpc.Code.PERMISSION_DENIED][google.rpc.Code.PERMISSION_DENIED].
+   * 

+   *
+   * string resource_name = 2;
+   * @return The resourceName.
+   */
+  java.lang.String getResourceName();
+  /**
+   * 
+   * The name of the resource being accessed.  For example, a shared calendar
+   * name: "example.com_4fghdhgsrgh@group.calendar.google.com", if the current
+   * error is
+   * [google.rpc.Code.PERMISSION_DENIED][google.rpc.Code.PERMISSION_DENIED].
+   * 

+   *
+   * string resource_name = 2;
+   * @return The bytes for resourceName.
+   */
+  com.google.protobuf.ByteString
+      getResourceNameBytes();
+
+  /**
+   * 
+   * The owner of the resource (optional).
+   * For example, "user:<owner email>" or "project:<Google developer project
+   * id>".
+   * 

+   *
+   * string owner = 3;
+   * @return The owner.
+   */
+  java.lang.String getOwner();
+  /**
+   * 
+   * The owner of the resource (optional).
+   * For example, "user:<owner email>" or "project:<Google developer project
+   * id>".
+   * 

+   *
+   * string owner = 3;
+   * @return The bytes for owner.
+   */
+  com.google.protobuf.ByteString
+      getOwnerBytes();
+
+  /**
+   * 
+   * Describes what error is encountered when accessing this resource.
+   * For example, updating a cloud project may require the `writer` permission
+   * on the developer console project.
+   * 

+   *
+   * string description = 4;
+   * @return The description.
+   */
+  java.lang.String getDescription();
+  /**
+   * 
+   * Describes what error is encountered when accessing this resource.
+   * For example, updating a cloud project may require the `writer` permission
+   * on the developer console project.
+   * 

+   *
+   * string description = 4;
+   * @return The bytes for description.
+   */
+  com.google.protobuf.ByteString
+      getDescriptionBytes();
+}
diff --git a/src/main/java/org/vdaas/vald/api/v1/rpc/RetryInfo.java b/src/main/java/org/vdaas/vald/api/v1/rpc/RetryInfo.java
new file mode 100644
index 00000000..3bfd547d
--- /dev/null
+++ b/src/main/java/org/vdaas/vald/api/v1/rpc/RetryInfo.java
@@ -0,0 +1,678 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: apis/proto/v1/rpc/error_details.proto
+
+package org.vdaas.vald.api.v1.rpc;
+
+/**
+ * 
+ * Describes when the clients can retry a failed request. Clients could ignore
+ * the recommendation here or retry when this information is missing from error
+ * responses.
+ *
+ * It's always recommended that clients should use exponential backoff when
+ * retrying.
+ *
+ * Clients should wait until `retry_delay` amount of time has passed since
+ * receiving the error response before retrying.  If retrying requests also
+ * fail, clients should use an exponential backoff scheme to gradually increase
+ * the delay between retries based on `retry_delay`, until either a maximum
+ * number of retries have been reached or a maximum retry delay cap has been
+ * reached.
+ * 

+ *
+ * Protobuf type {@code rpc.v1.RetryInfo}
+ */
+public final class RetryInfo extends
+    com.google.protobuf.GeneratedMessageV3 implements
+    // @@protoc_insertion_point(message_implements:rpc.v1.RetryInfo)
+    RetryInfoOrBuilder {
+private static final long serialVersionUID = 0L;
+  // Use RetryInfo.newBuilder() to construct.
+  private RetryInfo(com.google.protobuf.GeneratedMessageV3.Builder builder) {
+    super(builder);
+  }
+  private RetryInfo() {
+  }
+
+  @java.lang.Override
+  @SuppressWarnings({"unused"})
+  protected java.lang.Object newInstance(
+      UnusedPrivateParameter unused) {
+    return new RetryInfo();
+  }
+
+  public static final com.google.protobuf.Descriptors.Descriptor
+      getDescriptor() {
+    return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_RetryInfo_descriptor;
+  }
+
+  @java.lang.Override
+  protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internalGetFieldAccessorTable() {
+    return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_RetryInfo_fieldAccessorTable
+        .ensureFieldAccessorsInitialized(
+            org.vdaas.vald.api.v1.rpc.RetryInfo.class, org.vdaas.vald.api.v1.rpc.RetryInfo.Builder.class);
+  }
+
+  private int bitField0_;
+  public static final int RETRY_DELAY_FIELD_NUMBER = 1;
+  private com.google.protobuf.Duration retryDelay_;
+  /**
+   * 
+   * Clients should wait at least this long between retrying the same request.
+   * 

+   *
+   * .google.protobuf.Duration retry_delay = 1;
+   * @return Whether the retryDelay field is set.
+   */
+  @java.lang.Override
+  public boolean hasRetryDelay() {
+    return ((bitField0_ & 0x00000001) != 0);
+  }
+  /**
+   * 
+   * Clients should wait at least this long between retrying the same request.
+   * 

+   *
+   * .google.protobuf.Duration retry_delay = 1;
+   * @return The retryDelay.
+   */
+  @java.lang.Override
+  public com.google.protobuf.Duration getRetryDelay() {
+    return retryDelay_ == null ? com.google.protobuf.Duration.getDefaultInstance() : retryDelay_;
+  }
+  /**
+   * 
+   * Clients should wait at least this long between retrying the same request.
+   * 

+   *
+   * .google.protobuf.Duration retry_delay = 1;
+   */
+  @java.lang.Override
+  public com.google.protobuf.DurationOrBuilder getRetryDelayOrBuilder() {
+    return retryDelay_ == null ? com.google.protobuf.Duration.getDefaultInstance() : retryDelay_;
+  }
+
+  private byte memoizedIsInitialized = -1;
+  @java.lang.Override
+  public final boolean isInitialized() {
+    byte isInitialized = memoizedIsInitialized;
+    if (isInitialized == 1) return true;
+    if (isInitialized == 0) return false;
+
+    memoizedIsInitialized = 1;
+    return true;
+  }
+
+  @java.lang.Override
+  public void writeTo(com.google.protobuf.CodedOutputStream output)
+                      throws java.io.IOException {
+    if (((bitField0_ & 0x00000001) != 0)) {
+      output.writeMessage(1, getRetryDelay());
+    }
+    getUnknownFields().writeTo(output);
+  }
+
+  @java.lang.Override
+  public int getSerializedSize() {
+    int size = memoizedSize;
+    if (size != -1) return size;
+
+    size = 0;
+    if (((bitField0_ & 0x00000001) != 0)) {
+      size += com.google.protobuf.CodedOutputStream
+        .computeMessageSize(1, getRetryDelay());
+    }
+    size += getUnknownFields().getSerializedSize();
+    memoizedSize = size;
+    return size;
+  }
+
+  @java.lang.Override
+  public boolean equals(final java.lang.Object obj) {
+    if (obj == this) {
+     return true;
+    }
+    if (!(obj instanceof org.vdaas.vald.api.v1.rpc.RetryInfo)) {
+      return super.equals(obj);
+    }
+    org.vdaas.vald.api.v1.rpc.RetryInfo other = (org.vdaas.vald.api.v1.rpc.RetryInfo) obj;
+
+    if (hasRetryDelay() != other.hasRetryDelay()) return false;
+    if (hasRetryDelay()) {
+      if (!getRetryDelay()
+          .equals(other.getRetryDelay())) return false;
+    }
+    if (!getUnknownFields().equals(other.getUnknownFields())) return false;
+    return true;
+  }
+
+  @java.lang.Override
+  public int hashCode() {
+    if (memoizedHashCode != 0) {
+      return memoizedHashCode;
+    }
+    int hash = 41;
+    hash = (19 * hash) + getDescriptor().hashCode();
+    if (hasRetryDelay()) {
+      hash = (37 * hash) + RETRY_DELAY_FIELD_NUMBER;
+      hash = (53 * hash) + getRetryDelay().hashCode();
+    }
+    hash = (29 * hash) + getUnknownFields().hashCode();
+    memoizedHashCode = hash;
+    return hash;
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.RetryInfo parseFrom(
+      java.nio.ByteBuffer data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.RetryInfo parseFrom(
+      java.nio.ByteBuffer data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.RetryInfo parseFrom(
+      com.google.protobuf.ByteString data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.RetryInfo parseFrom(
+      com.google.protobuf.ByteString data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.RetryInfo parseFrom(byte[] data)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data);
+  }
+  public static org.vdaas.vald.api.v1.rpc.RetryInfo parseFrom(
+      byte[] data,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws com.google.protobuf.InvalidProtocolBufferException {
+    return PARSER.parseFrom(data, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.RetryInfo parseFrom(java.io.InputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input);
+  }
+  public static org.vdaas.vald.api.v1.rpc.RetryInfo parseFrom(
+      java.io.InputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input, extensionRegistry);
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.RetryInfo parseDelimitedFrom(java.io.InputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseDelimitedWithIOException(PARSER, input);
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.RetryInfo parseDelimitedFrom(
+      java.io.InputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
+  }
+  public static org.vdaas.vald.api.v1.rpc.RetryInfo parseFrom(
+      com.google.protobuf.CodedInputStream input)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input);
+  }
+  public static org.vdaas.vald.api.v1.rpc.RetryInfo parseFrom(
+      com.google.protobuf.CodedInputStream input,
+      com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+      throws java.io.IOException {
+    return com.google.protobuf.GeneratedMessageV3
+        .parseWithIOException(PARSER, input, extensionRegistry);
+  }
+
+  @java.lang.Override
+  public Builder newBuilderForType() { return newBuilder(); }
+  public static Builder newBuilder() {
+    return DEFAULT_INSTANCE.toBuilder();
+  }
+  public static Builder newBuilder(org.vdaas.vald.api.v1.rpc.RetryInfo prototype) {
+    return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+  }
+  @java.lang.Override
+  public Builder toBuilder() {
+    return this == DEFAULT_INSTANCE
+        ? new Builder() : new Builder().mergeFrom(this);
+  }
+
+  @java.lang.Override
+  protected Builder newBuilderForType(
+      com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+    Builder builder = new Builder(parent);
+    return builder;
+  }
+  /**
+   * 
+   * Describes when the clients can retry a failed request. Clients could ignore
+   * the recommendation here or retry when this information is missing from error
+   * responses.
+   *
+   * It's always recommended that clients should use exponential backoff when
+   * retrying.
+   *
+   * Clients should wait until `retry_delay` amount of time has passed since
+   * receiving the error response before retrying.  If retrying requests also
+   * fail, clients should use an exponential backoff scheme to gradually increase
+   * the delay between retries based on `retry_delay`, until either a maximum
+   * number of retries have been reached or a maximum retry delay cap has been
+   * reached.
+   * 

+   *
+   * Protobuf type {@code rpc.v1.RetryInfo}
+   */
+  public static final class Builder extends
+      com.google.protobuf.GeneratedMessageV3.Builder implements
+      // @@protoc_insertion_point(builder_implements:rpc.v1.RetryInfo)
+      org.vdaas.vald.api.v1.rpc.RetryInfoOrBuilder {
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_RetryInfo_descriptor;
+    }
+
+    @java.lang.Override
+    protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_RetryInfo_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              org.vdaas.vald.api.v1.rpc.RetryInfo.class, org.vdaas.vald.api.v1.rpc.RetryInfo.Builder.class);
+    }
+
+    // Construct using org.vdaas.vald.api.v1.rpc.RetryInfo.newBuilder()
+    private Builder() {
+      maybeForceBuilderInitialization();
+    }
+
+    private Builder(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      super(parent);
+      maybeForceBuilderInitialization();
+    }
+    private void maybeForceBuilderInitialization() {
+      if (com.google.protobuf.GeneratedMessageV3
+              .alwaysUseFieldBuilders) {
+        getRetryDelayFieldBuilder();
+      }
+    }
+    @java.lang.Override
+    public Builder clear() {
+      super.clear();
+      bitField0_ = 0;
+      retryDelay_ = null;
+      if (retryDelayBuilder_ != null) {
+        retryDelayBuilder_.dispose();
+        retryDelayBuilder_ = null;
+      }
+      return this;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Descriptors.Descriptor
+        getDescriptorForType() {
+      return org.vdaas.vald.api.v1.rpc.ErrorDetailsProto.internal_static_rpc_v1_RetryInfo_descriptor;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.RetryInfo getDefaultInstanceForType() {
+      return org.vdaas.vald.api.v1.rpc.RetryInfo.getDefaultInstance();
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.RetryInfo build() {
+      org.vdaas.vald.api.v1.rpc.RetryInfo result = buildPartial();
+      if (!result.isInitialized()) {
+        throw newUninitializedMessageException(result);
+      }
+      return result;
+    }
+
+    @java.lang.Override
+    public org.vdaas.vald.api.v1.rpc.RetryInfo buildPartial() {
+      org.vdaas.vald.api.v1.rpc.RetryInfo result = new org.vdaas.vald.api.v1.rpc.RetryInfo(this);
+      if (bitField0_ != 0) { buildPartial0(result); }
+      onBuilt();
+      return result;
+    }
+
+    private void buildPartial0(org.vdaas.vald.api.v1.rpc.RetryInfo result) {
+      int from_bitField0_ = bitField0_;
+      int to_bitField0_ = 0;
+      if (((from_bitField0_ & 0x00000001) != 0)) {
+        result.retryDelay_ = retryDelayBuilder_ == null
+            ? retryDelay_
+            : retryDelayBuilder_.build();
+        to_bitField0_ |= 0x00000001;
+      }
+      result.bitField0_ |= to_bitField0_;
+    }
+
+    @java.lang.Override
+    public Builder clone() {
+      return super.clone();
+    }
+    @java.lang.Override
+    public Builder setField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        java.lang.Object value) {
+      return super.setField(field, value);
+    }
+    @java.lang.Override
+    public Builder clearField(
+        com.google.protobuf.Descriptors.FieldDescriptor field) {
+      return super.clearField(field);
+    }
+    @java.lang.Override
+    public Builder clearOneof(
+        com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+      return super.clearOneof(oneof);
+    }
+    @java.lang.Override
+    public Builder setRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        int index, java.lang.Object value) {
+      return super.setRepeatedField(field, index, value);
+    }
+    @java.lang.Override
+    public Builder addRepeatedField(
+        com.google.protobuf.Descriptors.FieldDescriptor field,
+        java.lang.Object value) {
+      return super.addRepeatedField(field, value);
+    }
+    @java.lang.Override
+    public Builder mergeFrom(com.google.protobuf.Message other) {
+      if (other instanceof org.vdaas.vald.api.v1.rpc.RetryInfo) {
+        return mergeFrom((org.vdaas.vald.api.v1.rpc.RetryInfo)other);
+      } else {
+        super.mergeFrom(other);
+        return this;
+      }
+    }
+
+    public Builder mergeFrom(org.vdaas.vald.api.v1.rpc.RetryInfo other) {
+      if (other == org.vdaas.vald.api.v1.rpc.RetryInfo.getDefaultInstance()) return this;
+      if (other.hasRetryDelay()) {
+        mergeRetryDelay(other.getRetryDelay());
+      }
+      this.mergeUnknownFields(other.getUnknownFields());
+      onChanged();
+      return this;
+    }
+
+    @java.lang.Override
+    public final boolean isInitialized() {
+      return true;
+    }
+
+    @java.lang.Override
+    public Builder mergeFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      if (extensionRegistry == null) {
+        throw new java.lang.NullPointerException();
+      }
+      try {
+        boolean done = false;
+        while (!done) {
+          int tag = input.readTag();
+          switch (tag) {
+            case 0:
+              done = true;
+              break;
+            case 10: {
+              input.readMessage(
+                  getRetryDelayFieldBuilder().getBuilder(),
+                  extensionRegistry);
+              bitField0_ |= 0x00000001;
+              break;
+            } // case 10
+            default: {
+              if (!super.parseUnknownField(input, extensionRegistry, tag)) {
+                done = true; // was an endgroup tag
+              }
+              break;
+            } // default:
+          } // switch (tag)
+        } // while (!done)
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.unwrapIOException();
+      } finally {
+        onChanged();
+      } // finally
+      return this;
+    }
+    private int bitField0_;
+
+    private com.google.protobuf.Duration retryDelay_;
+    private com.google.protobuf.SingleFieldBuilderV3<
+        com.google.protobuf.Duration, com.google.protobuf.Duration.Builder, com.google.protobuf.DurationOrBuilder> retryDelayBuilder_;
+    /**
+     * 
+     * Clients should wait at least this long between retrying the same request.
+     * 

+     *
+     * .google.protobuf.Duration retry_delay = 1;
+     * @return Whether the retryDelay field is set.
+     */
+    public boolean hasRetryDelay() {
+      return ((bitField0_ & 0x00000001) != 0);
+    }
+    /**
+     * 
+     * Clients should wait at least this long between retrying the same request.
+     * 

+     *
+     * .google.protobuf.Duration retry_delay = 1;
+     * @return The retryDelay.
+     */
+    public com.google.protobuf.Duration getRetryDelay() {
+      if (retryDelayBuilder_ == null) {
+        return retryDelay_ == null ? com.google.protobuf.Duration.getDefaultInstance() : retryDelay_;
+      } else {
+        return retryDelayBuilder_.getMessage();
+      }
+    }
+    /**
+     * 
+     * Clients should wait at least this long between retrying the same request.
+     * 

+     *
+     * .google.protobuf.Duration retry_delay = 1;
+     */
+    public Builder setRetryDelay(com.google.protobuf.Duration value) {
+      if (retryDelayBuilder_ == null) {
+        if (value == null) {
+          throw new NullPointerException();
+        }
+        retryDelay_ = value;
+      } else {
+        retryDelayBuilder_.setMessage(value);
+      }
+      bitField0_ |= 0x00000001;
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * Clients should wait at least this long between retrying the same request.
+     * 

+     *
+     * .google.protobuf.Duration retry_delay = 1;
+     */
+    public Builder setRetryDelay(
+        com.google.protobuf.Duration.Builder builderForValue) {
+      if (retryDelayBuilder_ == null) {
+        retryDelay_ = builderForValue.build();
+      } else {
+        retryDelayBuilder_.setMessage(builderForValue.build());
+      }
+      bitField0_ |= 0x00000001;
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * Clients should wait at least this long between retrying the same request.
+     * 

+     *
+     * .google.protobuf.Duration retry_delay = 1;
+     */
+    public Builder mergeRetryDelay(com.google.protobuf.Duration value) {
+      if (retryDelayBuilder_ == null) {
+        if (((bitField0_ & 0x00000001) != 0) &&
+          retryDelay_ != null &&
+          retryDelay_ != com.google.protobuf.Duration.getDefaultInstance()) {
+          getRetryDelayBuilder().mergeFrom(value);
+        } else {
+          retryDelay_ = value;
+        }
+      } else {
+        retryDelayBuilder_.mergeFrom(value);
+      }
+      if (retryDelay_ != null) {
+        bitField0_ |= 0x00000001;
+        onChanged();
+      }
+      return this;
+    }
+    /**
+     * 
+     * Clients should wait at least this long between retrying the same request.
+     * 

+     *
+     * .google.protobuf.Duration retry_delay = 1;
+     */
+    public Builder clearRetryDelay() {
+      bitField0_ = (bitField0_ & ~0x00000001);
+      retryDelay_ = null;
+      if (retryDelayBuilder_ != null) {
+        retryDelayBuilder_.dispose();
+        retryDelayBuilder_ = null;
+      }
+      onChanged();
+      return this;
+    }
+    /**
+     * 
+     * Clients should wait at least this long between retrying the same request.
+     * 

+     *
+     * .google.protobuf.Duration retry_delay = 1;
+     */
+    public com.google.protobuf.Duration.Builder getRetryDelayBuilder() {
+      bitField0_ |= 0x00000001;
+      onChanged();
+      return getRetryDelayFieldBuilder().getBuilder();
+    }
+    /**
+     * 
+     * Clients should wait at least this long between retrying the same request.
+     * 

+     *
+     * .google.protobuf.Duration retry_delay = 1;
+     */
+    public com.google.protobuf.DurationOrBuilder getRetryDelayOrBuilder() {
+      if (retryDelayBuilder_ != null) {
+        return retryDelayBuilder_.getMessageOrBuilder();
+      } else {
+        return retryDelay_ == null ?
+            com.google.protobuf.Duration.getDefaultInstance() : retryDelay_;
+      }
+    }
+    /**
+     * 
+     * Clients should wait at least this long between retrying the same request.
+     * 

+     *
+     * .google.protobuf.Duration retry_delay = 1;
+     */
+    private com.google.protobuf.SingleFieldBuilderV3<
+        com.google.protobuf.Duration, com.google.protobuf.Duration.Builder, com.google.protobuf.DurationOrBuilder> 
+        getRetryDelayFieldBuilder() {
+      if (retryDelayBuilder_ == null) {
+        retryDelayBuilder_ = new com.google.protobuf.SingleFieldBuilderV3<
+            com.google.protobuf.Duration, com.google.protobuf.Duration.Builder, com.google.protobuf.DurationOrBuilder>(
+                getRetryDelay(),
+                getParentForChildren(),
+                isClean());
+        retryDelay_ = null;
+      }
+      return retryDelayBuilder_;
+    }
+    @java.lang.Override
+    public final Builder setUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.setUnknownFields(unknownFields);
+    }
+
+    @java.lang.Override
+    public final Builder mergeUnknownFields(
+        final com.google.protobuf.UnknownFieldSet unknownFields) {
+      return super.mergeUnknownFields(unknownFields);
+    }
+
+
+    // @@protoc_insertion_point(builder_scope:rpc.v1.RetryInfo)
+  }
+
+  // @@protoc_insertion_point(class_scope:rpc.v1.RetryInfo)
+  private static final org.vdaas.vald.api.v1.rpc.RetryInfo DEFAULT_INSTANCE;
+  static {
+    DEFAULT_INSTANCE = new org.vdaas.vald.api.v1.rpc.RetryInfo();
+  }
+
+  public static org.vdaas.vald.api.v1.rpc.RetryInfo getDefaultInstance() {
+    return DEFAULT_INSTANCE;
+  }
+
+  private static final com.google.protobuf.Parser
+      PARSER = new com.google.protobuf.AbstractParser() {
+    @java.lang.Override
+    public RetryInfo parsePartialFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      Builder builder = newBuilder();
+      try {
+        builder.mergeFrom(input, extensionRegistry);
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(builder.buildPartial());
+      } catch (com.google.protobuf.UninitializedMessageException e) {
+        throw e.asInvalidProtocolBufferException().setUnfinishedMessage(builder.buildPartial());
+      } catch (java.io.IOException e) {
+        throw new com.google.protobuf.InvalidProtocolBufferException(e)
+            .setUnfinishedMessage(builder.buildPartial());
+      }
+      return builder.buildPartial();
+    }
+  };
+
+  public static com.google.protobuf.Parser parser() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public com.google.protobuf.Parser getParserForType() {
+    return PARSER;
+  }
+
+  @java.lang.Override
+  public org.vdaas.vald.api.v1.rpc.RetryInfo getDefaultInstanceForType() {
+    return DEFAULT_INSTANCE;
+  }
+
+}
+
diff --git a/src/main/java/org/vdaas/vald/api/v1/rpc/RetryInfoOrBuilder.java b/src/main/java/org/vdaas/vald/api/v1/rpc/RetryInfoOrBuilder.java
new file mode 100644
index 00000000..9ebebe8c
--- /dev/null
+++ b/src/main/java/org/vdaas/vald/api/v1/rpc/RetryInfoOrBuilder.java
@@ -0,0 +1,36 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: apis/proto/v1/rpc/error_details.proto
+
+package org.vdaas.vald.api.v1.rpc;
+
+public interface RetryInfoOrBuilder extends
+    // @@protoc_insertion_point(interface_extends:rpc.v1.RetryInfo)
+    com.google.protobuf.MessageOrBuilder {
+
+  /**
+   * 
+   * Clients should wait at least this long between retrying the same request.
+   * 

+   *
+   * .google.protobuf.Duration retry_delay = 1;
+   * @return Whether the retryDelay field is set.
+   */
+  boolean hasRetryDelay();
+  /**
+   * 
+   * Clients should wait at least this long between retrying the same request.
+   * 

+   *
+   * .google.protobuf.Duration retry_delay = 1;
+   * @return The retryDelay.
+   */
+  com.google.protobuf.Duration getRetryDelay();
+  /**
+   * 
+   * Clients should wait at least this long between retrying the same request.
+   * 

+   *
+   * .google.protobuf.Duration retry_delay = 1;
+   */
+  com.google.protobuf.DurationOrBuilder getRetryDelayOrBuilder();
+}
diff --git a/src/main/java/org/vdaas/vald/api/v1/vald/FilterGrpc.java b/src/main/java/org/vdaas/vald/api/v1/vald/FilterGrpc.java
index f41b8837..5d64819b 100644
--- a/src/main/java/org/vdaas/vald/api/v1/vald/FilterGrpc.java
+++ b/src/main/java/org/vdaas/vald/api/v1/vald/FilterGrpc.java
@@ -8,14 +8,14 @@
  * 

  */
 @javax.annotation.Generated(
-    value = "by gRPC proto compiler (version 1.55.1)",
+    value = "by gRPC proto compiler (version 1.58.0)",
     comments = "Source: apis/proto/v1/vald/filter.proto")
 @io.grpc.stub.annotations.GrpcGenerated
 public final class FilterGrpc {
 
   private FilterGrpc() {}
 
-  public static final String SERVICE_NAME = "vald.v1.Filter";
+  public static final java.lang.String SERVICE_NAME = "vald.v1.Filter";
 
   // Static method descriptors that strictly reflect the proto.
   private static volatile io.grpc.MethodDescriptor
  */
 @javax.annotation.Generated(
-    value = "by gRPC proto compiler (version 1.55.1)",
+    value = "by gRPC proto compiler (version 1.58.0)",
     comments = "Source: apis/proto/v1/vald/insert.proto")
 @io.grpc.stub.annotations.GrpcGenerated
 public final class InsertGrpc {
 
   private InsertGrpc() {}
 
-  public static final String SERVICE_NAME = "vald.v1.Insert";
+  public static final java.lang.String SERVICE_NAME = "vald.v1.Insert";
 
   // Static method descriptors that strictly reflect the proto.
   private static volatile io.grpc.MethodDescriptor
  */
 @javax.annotation.Generated(
-    value = "by gRPC proto compiler (version 1.55.1)",
+    value = "by gRPC proto compiler (version 1.58.0)",
     comments = "Source: apis/proto/v1/vald/object.proto")
 @io.grpc.stub.annotations.GrpcGenerated
 public final class ObjectGrpc {
 
   private ObjectGrpc() {}
 
-  public static final String SERVICE_NAME = "vald.v1.Object";
+  public static final java.lang.String SERVICE_NAME = "vald.v1.Object";
 
   // Static method descriptors that strictly reflect the proto.
   private static volatile io.grpc.MethodDescriptor getStreamGetObjectMethod() {
     return getStreamGetObjectMethod;
   }
 
+  private static volatile io.grpc.MethodDescriptor getStreamListObjectMethod;
+
+  @io.grpc.stub.annotations.RpcMethod(
+      fullMethodName = SERVICE_NAME + '/' + "StreamListObject",
+      requestType = org.vdaas.vald.api.v1.payload.Object.List.Request.class,
+      responseType = org.vdaas.vald.api.v1.payload.Object.List.Response.class,
+      methodType = io.grpc.MethodDescriptor.MethodType.SERVER_STREAMING)
+  public static io.grpc.MethodDescriptor getStreamListObjectMethod() {
+    io.grpc.MethodDescriptor getStreamListObjectMethod;
+    if ((getStreamListObjectMethod = ObjectGrpc.getStreamListObjectMethod) == null) {
+      synchronized (ObjectGrpc.class) {
+        if ((getStreamListObjectMethod = ObjectGrpc.getStreamListObjectMethod) == null) {
+          ObjectGrpc.getStreamListObjectMethod = getStreamListObjectMethod =
+              io.grpc.MethodDescriptor.newBuilder()
+              .setType(io.grpc.MethodDescriptor.MethodType.SERVER_STREAMING)
+              .setFullMethodName(generateFullMethodName(SERVICE_NAME, "StreamListObject"))
+              .setSampledToLocalTracing(true)
+              .setRequestMarshaller(io.grpc.protobuf.ProtoUtils.marshaller(
+                  org.vdaas.vald.api.v1.payload.Object.List.Request.getDefaultInstance()))
+              .setResponseMarshaller(io.grpc.protobuf.ProtoUtils.marshaller(
+                  org.vdaas.vald.api.v1.payload.Object.List.Response.getDefaultInstance()))
+              .setSchemaDescriptor(new ObjectMethodDescriptorSupplier("StreamListObject"))
+              .build();
+        }
+      }
+    }
+    return getStreamListObjectMethod;
+  }
+
   /**
    * Creates a new async stub that supports all call types for the service
    */
@@ -191,6 +222,16 @@ default io.grpc.stub.StreamObserver responseObserver) {
       return io.grpc.stub.ServerCalls.asyncUnimplementedStreamingCall(getStreamGetObjectMethod(), responseObserver);
     }
+
+    /**
+     * 
+     * A method to get all the vectors with server streaming
+     * 

+     */
+    default void streamListObject(org.vdaas.vald.api.v1.payload.Object.List.Request request,
+        io.grpc.stub.StreamObserver responseObserver) {
+      io.grpc.stub.ServerCalls.asyncUnimplementedUnaryCall(getStreamListObjectMethod(), responseObserver);
+    }
   }
 
   /**
@@ -258,6 +299,17 @@ public io.grpc.stub.StreamObserver
+     * A method to get all the vectors with server streaming
+     * 

+     */
+    public void streamListObject(org.vdaas.vald.api.v1.payload.Object.List.Request request,
+        io.grpc.stub.StreamObserver responseObserver) {
+      io.grpc.stub.ClientCalls.asyncServerStreamingCall(
+          getChannel().newCall(getStreamListObjectMethod(), getCallOptions()), request, responseObserver);
+    }
   }
 
   /**
@@ -298,6 +350,17 @@ public org.vdaas.vald.api.v1.payload.Object.Vector getObject(org.vdaas.vald.api.
       return io.grpc.stub.ClientCalls.blockingUnaryCall(
           getChannel(), getGetObjectMethod(), getCallOptions(), request);
     }
+
+    /**
+     * 
+     * A method to get all the vectors with server streaming
+     * 

+     */
+    public java.util.Iterator streamListObject(
+        org.vdaas.vald.api.v1.payload.Object.List.Request request) {
+      return io.grpc.stub.ClientCalls.blockingServerStreamingCall(
+          getChannel(), getStreamListObjectMethod(), getCallOptions(), request);
+    }
   }
 
   /**
@@ -344,7 +407,8 @@ public com.google.common.util.concurrent.ListenableFuture implements
       io.grpc.stub.ServerCalls.UnaryMethod,
@@ -371,6 +435,10 @@ public void invoke(Req request, io.grpc.stub.StreamObserver responseObserv
           serviceImpl.getObject((org.vdaas.vald.api.v1.payload.Object.VectorRequest) request,
               (io.grpc.stub.StreamObserver) responseObserver);
           break;
+        case METHODID_STREAM_LIST_OBJECT:
+          serviceImpl.streamListObject((org.vdaas.vald.api.v1.payload.Object.List.Request) request,
+              (io.grpc.stub.StreamObserver) responseObserver);
+          break;
         default:
           throw new AssertionError();
       }
@@ -413,6 +481,13 @@ public static final io.grpc.ServerServiceDefinition bindService(AsyncService ser
               org.vdaas.vald.api.v1.payload.Object.VectorRequest,
               org.vdaas.vald.api.v1.payload.Object.StreamVector>(
                 service, METHODID_STREAM_GET_OBJECT)))
+        .addMethod(
+          getStreamListObjectMethod(),
+          io.grpc.stub.ServerCalls.asyncServerStreamingCall(
+            new MethodHandlers<
+              org.vdaas.vald.api.v1.payload.Object.List.Request,
+              org.vdaas.vald.api.v1.payload.Object.List.Response>(
+                service, METHODID_STREAM_LIST_OBJECT)))
         .build();
   }
 
@@ -439,9 +514,9 @@ private static final class ObjectFileDescriptorSupplier
   private static final class ObjectMethodDescriptorSupplier
       extends ObjectBaseDescriptorSupplier
       implements io.grpc.protobuf.ProtoMethodDescriptorSupplier {
-    private final String methodName;
+    private final java.lang.String methodName;
 
-    ObjectMethodDescriptorSupplier(String methodName) {
+    ObjectMethodDescriptorSupplier(java.lang.String methodName) {
       this.methodName = methodName;
     }
 
@@ -464,6 +539,7 @@ public static io.grpc.ServiceDescriptor getServiceDescriptor() {
               .addMethod(getExistsMethod())
               .addMethod(getGetObjectMethod())
               .addMethod(getStreamGetObjectMethod())
+              .addMethod(getStreamListObjectMethod())
               .build();
         }
       }
diff --git a/src/main/java/org/vdaas/vald/api/v1/vald/RemoveGrpc.java b/src/main/java/org/vdaas/vald/api/v1/vald/RemoveGrpc.java
index ddb805ff..b14ed08a 100644
--- a/src/main/java/org/vdaas/vald/api/v1/vald/RemoveGrpc.java
+++ b/src/main/java/org/vdaas/vald/api/v1/vald/RemoveGrpc.java
@@ -8,14 +8,14 @@
  * 

  */
 @javax.annotation.Generated(
-    value = "by gRPC proto compiler (version 1.55.1)",
+    value = "by gRPC proto compiler (version 1.58.0)",
     comments = "Source: apis/proto/v1/vald/remove.proto")
 @io.grpc.stub.annotations.GrpcGenerated
 public final class RemoveGrpc {
 
   private RemoveGrpc() {}
 
-  public static final String SERVICE_NAME = "vald.v1.Remove";
+  public static final java.lang.String SERVICE_NAME = "vald.v1.Remove";
 
   // Static method descriptors that strictly reflect the proto.
   private static volatile io.grpc.MethodDescriptor getRemoveMethod() {
     return getRemoveMethod;
   }
 
+  private static volatile io.grpc.MethodDescriptor getRemoveByTimestampMethod;
+
+  @io.grpc.stub.annotations.RpcMethod(
+      fullMethodName = SERVICE_NAME + '/' + "RemoveByTimestamp",
+      requestType = org.vdaas.vald.api.v1.payload.Remove.TimestampRequest.class,
+      responseType = org.vdaas.vald.api.v1.payload.Object.Locations.class,
+      methodType = io.grpc.MethodDescriptor.MethodType.UNARY)
+  public static io.grpc.MethodDescriptor getRemoveByTimestampMethod() {
+    io.grpc.MethodDescriptor getRemoveByTimestampMethod;
+    if ((getRemoveByTimestampMethod = RemoveGrpc.getRemoveByTimestampMethod) == null) {
+      synchronized (RemoveGrpc.class) {
+        if ((getRemoveByTimestampMethod = RemoveGrpc.getRemoveByTimestampMethod) == null) {
+          RemoveGrpc.getRemoveByTimestampMethod = getRemoveByTimestampMethod =
+              io.grpc.MethodDescriptor.newBuilder()
+              .setType(io.grpc.MethodDescriptor.MethodType.UNARY)
+              .setFullMethodName(generateFullMethodName(SERVICE_NAME, "RemoveByTimestamp"))
+              .setSampledToLocalTracing(true)
+              .setRequestMarshaller(io.grpc.protobuf.ProtoUtils.marshaller(
+                  org.vdaas.vald.api.v1.payload.Remove.TimestampRequest.getDefaultInstance()))
+              .setResponseMarshaller(io.grpc.protobuf.ProtoUtils.marshaller(
+                  org.vdaas.vald.api.v1.payload.Object.Locations.getDefaultInstance()))
+              .setSchemaDescriptor(new RemoveMethodDescriptorSupplier("RemoveByTimestamp"))
+              .build();
+        }
+      }
+    }
+    return getRemoveByTimestampMethod;
+  }
+
   private static volatile io.grpc.MethodDescriptor getStreamRemoveMethod;
 
@@ -172,6 +203,16 @@ default void remove(org.vdaas.vald.api.v1.payload.Remove.Request request,
       io.grpc.stub.ServerCalls.asyncUnimplementedUnaryCall(getRemoveMethod(), responseObserver);
     }
 
+    /**
+     * 
+     * A method to remove an indexed vector based on timestamp.
+     * 

+     */
+    default void removeByTimestamp(org.vdaas.vald.api.v1.payload.Remove.TimestampRequest request,
+        io.grpc.stub.StreamObserver responseObserver) {
+      io.grpc.stub.ServerCalls.asyncUnimplementedUnaryCall(getRemoveByTimestampMethod(), responseObserver);
+    }
+
     /**
      * 
      * A method to remove multiple indexed vectors by bidirectional streaming.
@@ -237,6 +278,17 @@ public void remove(org.vdaas.vald.api.v1.payload.Remove.Request request,
           getChannel().newCall(getRemoveMethod(), getCallOptions()), request, responseObserver);
     }
 
+    /**
+     * 
+     * A method to remove an indexed vector based on timestamp.
+     * 

+     */
+    public void removeByTimestamp(org.vdaas.vald.api.v1.payload.Remove.TimestampRequest request,
+        io.grpc.stub.StreamObserver responseObserver) {
+      io.grpc.stub.ClientCalls.asyncUnaryCall(
+          getChannel().newCall(getRemoveByTimestampMethod(), getCallOptions()), request, responseObserver);
+    }
+
     /**
      * 
      * A method to remove multiple indexed vectors by bidirectional streaming.
@@ -289,6 +341,16 @@ public org.vdaas.vald.api.v1.payload.Object.Location remove(org.vdaas.vald.api.v
           getChannel(), getRemoveMethod(), getCallOptions(), request);
     }
 
+    /**
+     * 
+     * A method to remove an indexed vector based on timestamp.
+     * 

+     */
+    public org.vdaas.vald.api.v1.payload.Object.Locations removeByTimestamp(org.vdaas.vald.api.v1.payload.Remove.TimestampRequest request) {
+      return io.grpc.stub.ClientCalls.blockingUnaryCall(
+          getChannel(), getRemoveByTimestampMethod(), getCallOptions(), request);
+    }
+
     /**
      * 
      * A method to remove multiple indexed vectors in a single request.
@@ -330,6 +392,17 @@ public com.google.common.util.concurrent.ListenableFuture
+     * A method to remove an indexed vector based on timestamp.
+     * 

+     */
+    public com.google.common.util.concurrent.ListenableFuture removeByTimestamp(
+        org.vdaas.vald.api.v1.payload.Remove.TimestampRequest request) {
+      return io.grpc.stub.ClientCalls.futureUnaryCall(
+          getChannel().newCall(getRemoveByTimestampMethod(), getCallOptions()), request);
+    }
+
     /**
      * 
      * A method to remove multiple indexed vectors in a single request.
@@ -343,8 +416,9 @@ public com.google.common.util.concurrent.ListenableFuture implements
       io.grpc.stub.ServerCalls.UnaryMethod,
@@ -367,6 +441,10 @@ public void invoke(Req request, io.grpc.stub.StreamObserver responseObserv
           serviceImpl.remove((org.vdaas.vald.api.v1.payload.Remove.Request) request,
               (io.grpc.stub.StreamObserver) responseObserver);
           break;
+        case METHODID_REMOVE_BY_TIMESTAMP:
+          serviceImpl.removeByTimestamp((org.vdaas.vald.api.v1.payload.Remove.TimestampRequest) request,
+              (io.grpc.stub.StreamObserver) responseObserver);
+          break;
         case METHODID_MULTI_REMOVE:
           serviceImpl.multiRemove((org.vdaas.vald.api.v1.payload.Remove.MultiRequest) request,
               (io.grpc.stub.StreamObserver) responseObserver);
@@ -399,6 +477,13 @@ public static final io.grpc.ServerServiceDefinition bindService(AsyncService ser
               org.vdaas.vald.api.v1.payload.Remove.Request,
               org.vdaas.vald.api.v1.payload.Object.Location>(
                 service, METHODID_REMOVE)))
+        .addMethod(
+          getRemoveByTimestampMethod(),
+          io.grpc.stub.ServerCalls.asyncUnaryCall(
+            new MethodHandlers<
+              org.vdaas.vald.api.v1.payload.Remove.TimestampRequest,
+              org.vdaas.vald.api.v1.payload.Object.Locations>(
+                service, METHODID_REMOVE_BY_TIMESTAMP)))
         .addMethod(
           getStreamRemoveMethod(),
           io.grpc.stub.ServerCalls.asyncBidiStreamingCall(
@@ -439,9 +524,9 @@ private static final class RemoveFileDescriptorSupplier
   private static final class RemoveMethodDescriptorSupplier
       extends RemoveBaseDescriptorSupplier
       implements io.grpc.protobuf.ProtoMethodDescriptorSupplier {
-    private final String methodName;
+    private final java.lang.String methodName;
 
-    RemoveMethodDescriptorSupplier(String methodName) {
+    RemoveMethodDescriptorSupplier(java.lang.String methodName) {
       this.methodName = methodName;
     }
 
@@ -462,6 +547,7 @@ public static io.grpc.ServiceDescriptor getServiceDescriptor() {
           serviceDescriptor = result = io.grpc.ServiceDescriptor.newBuilder(SERVICE_NAME)
               .setSchemaDescriptor(new RemoveFileDescriptorSupplier())
               .addMethod(getRemoveMethod())
+              .addMethod(getRemoveByTimestampMethod())
               .addMethod(getStreamRemoveMethod())
               .addMethod(getMultiRemoveMethod())
               .build();
diff --git a/src/main/java/org/vdaas/vald/api/v1/vald/SearchGrpc.java b/src/main/java/org/vdaas/vald/api/v1/vald/SearchGrpc.java
index 467074cf..96f3498a 100644
--- a/src/main/java/org/vdaas/vald/api/v1/vald/SearchGrpc.java
+++ b/src/main/java/org/vdaas/vald/api/v1/vald/SearchGrpc.java
@@ -8,14 +8,14 @@
  * 

  */
 @javax.annotation.Generated(
-    value = "by gRPC proto compiler (version 1.55.1)",
+    value = "by gRPC proto compiler (version 1.58.0)",
     comments = "Source: apis/proto/v1/vald/search.proto")
 @io.grpc.stub.annotations.GrpcGenerated
 public final class SearchGrpc {
 
   private SearchGrpc() {}
 
-  public static final String SERVICE_NAME = "vald.v1.Search";
+  public static final java.lang.String SERVICE_NAME = "vald.v1.Search";
 
   // Static method descriptors that strictly reflect the proto.
   private static volatile io.grpc.MethodDescriptor
  */
 @javax.annotation.Generated(
-    value = "by gRPC proto compiler (version 1.55.1)",
+    value = "by gRPC proto compiler (version 1.58.0)",
     comments = "Source: apis/proto/v1/vald/update.proto")
 @io.grpc.stub.annotations.GrpcGenerated
 public final class UpdateGrpc {
 
   private UpdateGrpc() {}
 
-  public static final String SERVICE_NAME = "vald.v1.Update";
+  public static final java.lang.String SERVICE_NAME = "vald.v1.Update";
 
   // Static method descriptors that strictly reflect the proto.
   private static volatile io.grpc.MethodDescriptor
  */
 @javax.annotation.Generated(
-    value = "by gRPC proto compiler (version 1.55.1)",
+    value = "by gRPC proto compiler (version 1.58.0)",
     comments = "Source: apis/proto/v1/vald/upsert.proto")
 @io.grpc.stub.annotations.GrpcGenerated
 public final class UpsertGrpc {
 
   private UpsertGrpc() {}
 
-  public static final String SERVICE_NAME = "vald.v1.Upsert";
+  public static final java.lang.String SERVICE_NAME = "vald.v1.Upsert";
 
   // Static method descriptors that strictly reflect the proto.
   private static volatile io.grpc.MethodDescriptor