[jira] [Created] (AMBARI-24448) "Druid Historical" default MaxDirectMemorySize=1TB

["Sean Roberts (JIRA)" <ji...@apache.org>]

Sean Roberts created AMBARI-24448:
-------------------------------------

             Summary: "Druid Historical" default MaxDirectMemorySize=1TB
                 Key: AMBARI-24448
                 URL: https://issues.apache.org/jira/browse/AMBARI-24448
             Project: Ambari
          Issue Type: Bug
          Components: stacks
    Affects Versions: 2.6.2, 2.7.0
            Reporter: Sean Roberts


By default, Ambari is giving "Druid Historical" component -XX:MaxDirectMemorySize=1048576m

I'm asking the Druid devs what a good default is, but 1TB of RAM is definitely too much! Once I get an answer, can send a pull request over.

`-XX:MaxDirectMemorySize` comes from druid-env. druid.historical.jvm.direct.memory and is appended with ‘m’:
https://github.com/apache/ambari/blob/trunk/ambari-server/src/main/resources/common-services/DRUID/0.10.1/package/scripts/druid.py#L109-L114

The default value is ‘1048576` which, when appeneded with 'm', is 1TB!:
https://github.com/apache/ambari/blob/trunk/ambari-server/src/main/resources/common-services/DRUID/0.10.1/configuration/druid-env.xml#L130-L131

Process listing:
{code}
$ ps aux | grep ^druid.*historical
druid     115683  0.0 15.6 97802020 82774676 ?   Sl   Jun08  66:48 /usr/java/default/bin/java -server -Xms2048m -Xmx2048m -XX:MaxDirectMemorySize=1048576m
{code}

In the JVM config file which Ambari manages:
{code}
$ grep MaxDirect /usr/hdp/current/druid-historical/conf/historical/jvm.config
-XX:MaxDirectMemorySize=1048576m
{code}



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