kafka broker + recommendation for JVM config

[#1]

hi all

according to the article in - https://community.hortonworks.com/articles/80813/kafka-best-practices-1.html

We recommend latest java 1.8 with G1 collector ( which is default in new version). If you are using Java 1.7 and G1 collector make sure you are on u51 or higher.

A recommended setting for JVM looks like following

-Xmx8g -Xms8g -XX:MetaspaceSize=96m -XX:+UseG1GC-XX:MaxGCPauseMillis=20 - XX:InitiatingHeapOccupancyPercent=35 -XX:G1HeapRegionSize=16M-XX:MinMetaspaceFreeRatio=50 - XX:MaxMetaspaceFreeRatio=80

my question - in which variable we need to set the values -> "-Xmx8g -Xms8g -XX:MetaspaceSize=96m -XX:+UseG1GC-XX:MaxGCPauseMillis=20 -XX:InitiatingHeapOccupancyPercent=35 -XX:G1HeapRegionSize=16M-XX:MinMetaspaceFreeRatio=50 -XX:MaxMetaspaceFreeRatio=80"

?

second - is it possible to set all recomended JVM by API ?

[#2 · Accepted solution]

@Michael Bronson,

Yes. Your both the above configs looks file and your final curl call will look like this

curl -u admin:admin -H "X-Requested-By: ambari" -X PUT -d '[
  {
    "Clusters": {
      "desired_config": [
        {
          "type": "kafka-env",
          "tag": "unique value",
           "properties" : {
        "content" : "\n#!/bin/bash\n\n# Set KAFKA specific environment variables here.\n\n# The java implementation to use.\nexport JAVA_HOME={{java64_home}}\nexport PATH=$PATH:$JAVA_HOME/bin\nexport PID_DIR={{kafka_pid_dir}}\nexport LOG_DIR={{kafka_log_dir}}\nexport KAFKA_KERBEROS_PARAMS={{kafka_kerberos_params}}\nexport JMX_PORT=9997\n# Add kafka sink to classpath and related depenencies\nif [ -e \"/usr/lib/ambari-metrics-kafka-sink/ambari-metrics-kafka-sink.jar\" ]; then\n  export CLASSPATH=$CLASSPATH:/usr/lib/ambari-metrics-kafka-sink/ambari-metrics-kafka-sink.jar\n  export CLASSPATH=$CLASSPATH:/usr/lib/ambari-metrics-kafka-sink/lib/*\nfi\n\nif [ -f /etc/kafka/conf/kafka-ranger-env.sh ]; then\n. /etc/kafka/conf/kafka-ranger-env.sh\nfi\nexport KAFKA_HEAP_OPTS=\"-Xmx8g -Xms8g\"\nKAFKA_JVM_PERFORMANCE_OPTS=\"-XX:MetaspaceSize=96m -XX:+UseG1GC-XX:MaxGCPauseMillis=20 - XX:InitiatingHeapOccupancyPercent=35 -XX:G1HeapRegionSize=16M-XX:MinMetaspaceFreeRatio=50 - XX:MaxMetaspaceFreeRatio=80\n"",
        "is_supported_kafka_ranger" : "true",
        "kafka_log_dir" : "/var/log/kafka",
        "kafka_pid_dir" : "/var/run/kafka",
        "kafka_user" : "kafka",
        "kafka_user_nofile_limit" : "128000",
        "kafka_user_nproc_limit" : "65536"
        },
        "service_config_version_note": "New config version"
        }
      ]
    }
  }
]' "http://master02:8080/api/v1/clusters/HDP"