Hadoop-3.2.1 Chart

This chart is modified from stable/hadoop.

Hadoop is a framework for running large scale distributed applications.

This chart is primarily intended to be used for YARN and MapReduce job execution where HDFS is just used as a means to transport small artifacts within the framework and not for a distributed filesystem. Data should be read from cloud based datastores such as Google Cloud Storage, S3 or Swift.

Chart Details

Installing the Chart

To install the chart with the release name hadoop that utilizes 50% of the available node resources:

$ helm install --name hadoop $(stable/hadoop/tools/calc_resources.sh 50) stable/hadoop

Note that you need at least 2GB of free memory per NodeManager pod, if your cluster isn't large enough, not all pods will be scheduled.

The optional calc_resources.sh script is used as a convenience helper to set the yarn.numNodes, and yarn.nodeManager.resources appropriately to utilize all nodes in the Kubernetes cluster and a given percentage of their resources. For example, with a 3 node n1-standard-4 GKE cluster and an argument of 50, this would create 3 NodeManager pods claiming 2 cores and 7.5Gi of memory.

Persistence

To install the chart with persistent volumes:

$ helm install --name hadoop $(stable/hadoop/tools/calc_resources.sh 50) \
  --set persistence.nameNode.enabled=true \
  --set persistence.nameNode.storageClass=standard \
  --set persistence.dataNode.enabled=true \
  --set persistence.dataNode.storageClass=standard \
  stable/hadoop

Change the value of storageClass to match your volume driver. standard works for Google Container Engine clusters.

Configuration

The following table lists the configurable parameters of the Hadoop chart and their default values.

Parameter	Description	Default
image.repository	Hadoop image (source)	danisla/hadoop
image.tag	Hadoop image tag	2.9.0
imagee.pullPolicy	Pull policy for the images	IfNotPresent
hadoopVersion	Version of hadoop libraries being used	2.9.0
antiAffinity	Pod antiaffinity, hard or soft	hard
hdfs.nameNode.pdbMinAvailable	PDB for HDFS NameNode	1
hdfs.nameNode.resources	resources for the HDFS NameNode	requests:memory=256Mi,cpu=10m,limits:memory=2048Mi,cpu=1000m
hdfs.dataNode.replicas	Number of HDFS DataNode replicas	1
hdfs.dataNode.pdbMinAvailable	PDB for HDFS DataNode	1
hdfs.dataNode.resources	resources for the HDFS DataNode	requests:memory=256Mi,cpu=10m,limits:memory=2048Mi,cpu=1000m
hdfs.webhdfs.enabled	Enable WebHDFS REST API	false
yarn.resourceManager.pdbMinAvailable	PDB for the YARN ResourceManager	1
yarn.resourceManager.resources	resources for the YARN ResourceManager	requests:memory=256Mi,cpu=10m,limits:memory=2048Mi,cpu=1000m
yarn.nodeManager.pdbMinAvailable	PDB for the YARN NodeManager	1
yarn.nodeManager.replicas	Number of YARN NodeManager replicas	2
yarn.nodeManager.parallelCreate	Create all nodeManager statefulset pods in parallel (K8S 1.7+)	false
yarn.nodeManager.resources	Resource limits and requests for YARN NodeManager pods	requests:memory=2048Mi,cpu=1000m,limits:memory=2048Mi,cpu=1000m
persistence.nameNode.enabled	Enable/disable persistent volume	false
persistence.nameNode.storageClass	Name of the StorageClass to use per your volume provider	-
persistence.nameNode.accessMode	Access mode for the volume	ReadWriteOnce
persistence.nameNode.size	Size of the volume	50Gi
persistence.dataNode.enabled	Enable/disable persistent volume	false
persistence.dataNode.storageClass	Name of the StorageClass to use per your volume provider	-
persistence.dataNode.accessMode	Access mode for the volume	ReadWriteOnce
persistence.dataNode.size	Size of the volume	200Gi

Related charts

The Zeppelin Notebook chart can use the hadoop config for the hadoop cluster and use the YARN executor:

helm install --set hadoop.useConfigMap=true stable/zeppelin

References

• Original K8S Hadoop adaptation this chart was derived from: https://github.com/Comcast/kube-yarn