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https://issues.apache.org/jira/browse/ZOOKEEPER-4701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17727826#comment-17727826
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zhanglu153 commented on ZOOKEEPER-4701:
---------------------------------------
[~eolivelli] There were some errors just now, and now the problem is described
in English.
The Docker script has configured JVMFLAGS and set some JVM configuration
parameters. However, when configuring the default heap size in the zkEnv.sh
script, SERVER_JVMFLAGS will be placed in the JVMFLAGS configuration in the
zkServer.sh script, allowing - Xmx to overwrite other JVM memory configurations.
{code:java}
if [ "x$SERVER_JVMFLAGS" != "x" ]
then
JVMFLAGS="$SERVER_JVMFLAGS $JVMFLAGS"
fi {code}
> Unable to use other JVM memory options to control zookeeper memory usage.
> -------------------------------------------------------------------------
>
> Key: ZOOKEEPER-4701
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4701
> Project: ZooKeeper
> Issue Type: Improvement
> Components: scripts
> Affects Versions: 3.5.9, 3.5.10, 3.5.0, 3.5.1, 3.5.2, 3.5.3, 3.5.4, 3.6.0,
> 3.6.3, 3.7.0, 3.5.5, 3.5.6, 3.5.7, 3.6.1, 3.5.8, 3.6.2, 3.8.0, 3.7.1, 3.6.4,
> 3.8.1
> Reporter: zhanglu153
> Priority: Minor
> Labels: Zookeeper
>
> After upgrading from version 3.4.14 to version 3.6.4, it was found that other
> JVM memory options such as - XX: MaxRAMPercentage cannot be used to control
> the memory usage of zookeeper. Upon investigation, it was found that the
> reason was due to the addition of a default setting for heap size in the
> zkEnv.sh script in version 3.5, with a default value of 1000M.
> {code:java}
> ZK_SERVER_HEAP="${ZK_SERVER_HEAP:-1000}"
> export SERVER_JVMFLAGS="-Xmx${ZK_SERVER_HEAP}m $SERVER_JVMFLAGS"
> {code}
> When the user uses - XX: MaxRAMPercentage to control the memory usage of
> zookeeper, it is found that the memory configuration will be overwritten by
> the default - Xmx configuration value. This does not meet the memory usage
> configuration required by the user.
> In ZOOKEEPER-4391, Unable to use newer JVM memory settings as Xmx overrides -
> ASF JIRA (apache.org)], it is also proposed to add a flag to disable the
> memory configuration behavior by default. This default value can only be
> optionally released when users need to use the default heap size
> configuration.
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