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https://issues.apache.org/jira/browse/YARN-9714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16915522#comment-16915522
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Tao Yang commented on YARN-9714:
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Thanks [~rohithsharma] for the comment. We are using hadoop-3.1 right now.
IIUIC, ZK connection can be closed in ZKRMStateStore#closeInternal only for
non-HA mode, we found this problem when HA is enabled which is also described
in the title "... leaks after RM transitioned to standby", I will move the fix
logic into ZKRMStateStore#closeInternal. Make sense?
> ZooKeeper connection in ZKRMStateStore leaks after RM transitioned to standby
> -----------------------------------------------------------------------------
>
> Key: YARN-9714
> URL: https://issues.apache.org/jira/browse/YARN-9714
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Reporter: Tao Yang
> Assignee: Tao Yang
> Priority: Major
> Labels: memory-leak
> Attachments: YARN-9714.001.patch, YARN-9714.002.patch
>
>
> Recently RM full GC happened in one of our clusters, after investigating the
> dump memory and jstack, I found two places in RM may cause memory leaks after
> RM transitioned to standby:
> # Release cache cleanup timer in AbstractYarnScheduler never be canceled.
> # ZooKeeper connection in ZKRMStateStore never be closed.
> To solve those leaks, we should close the connection or cancel the timer when
> services are stopping.
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