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Lightweight Sink Connector Logging

Sink connector uses the log4j version 2 directly, however the dependendent libraries like debezium and clickhouse-jdbc use different logging frameworks(JUL, slf4j). There is logic to use adapters to bridge the logging frameworks.

Logging is controlled by the log4j2.xml file in the 'docker' directory. This file is mounted into the container and is passed to the JVM as a system property.(-Dlog4j.configurationFile)

version: "3.4"

services:
  clickhouse-sink-connector-lt:
    image: ${CLICKHOUSE_SINK_CONNECTOR_LT_IMAGE}
    entrypoint: ["sh", "-c", "java -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:5005 -Xms4g -Xmx4g -Dlog4j2.configurationFile=log4j2.xml -jar /app.jar /config.yml com.altinity.clickhouse.debezium.embedded.ClickHouseDebeziumEmbeddedApplication"]
    restart: "no"
    ports:
      - "8083:8083"
      - "5005:5005"
      - "7000:7000"
    extra_hosts:
      - "host.docker.internal:host-gateway"
    volumes:
      - ./log4j2.xml:/log4j2.xml
      - ./config.yml:/config.yml

Log Levels

If you need to change the Logging level , you can modify the rootLogger level in the log4j2.xml file. By default its set to info level.

    <Root level="info" additivity="false">

Changing Layout (Example JSON)

If you want to change the layout of the logs, you can modify the log4j2.xml file. You can comment out the default PatternLayout and enable JSONLayout

        <Console name="console" target="SYSTEM_OUT">
            <!-- <JSONLayout compact="true" eventEol="true" properties="true" stacktraceAsString="true" includeTimeMillis="true" /> -->

            <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level - %msg%n"/>
        </Console>