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https://issues.apache.org/jira/browse/ROCKETMQ-307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16235298#comment-16235298
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ASF GitHub Bot commented on ROCKETMQ-307:
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zhouxinyu commented on issue #186: [ROCKETMQ-307] Polish the JVM parameters in
start scriptes
URL: https://github.com/apache/rocketmq/pull/186#issuecomment-341335627
Hi, sorry for late.
I have last two questions:
1. What's the default value `MetaspaceSize` and `MaxMetaspaceSize` in JDK8,
and are these new value reasonable?
2. Will these two parameters influence the low version JDK? like JDK7?
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> some jvm arguments need changed for java 8 and direct memory GC
> ---------------------------------------------------------------
>
> Key: ROCKETMQ-307
> URL: https://issues.apache.org/jira/browse/ROCKETMQ-307
> Project: Apache RocketMQ
> Issue Type: Improvement
> Components: rocketmq-externals
> Affects Versions: 4.2.0
> Environment: all
> Reporter: johnsonyjl
> Assignee: dongeforever
> Priority: Major
> Fix For: 4.2.0
>
>
> * new jvm arguments -XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=320m for jdk 8
> * remove the -XX:+DisableExplicitGC, if use the DisableExplicitGC, the direct
> memory GC will be not run correctly. please refer to
> java.nio.Bits#reserveMemory method
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