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https://issues.apache.org/jira/browse/YARN-9714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16896394#comment-16896394
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Bibin A Chundatt commented on YARN-9714:
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[~Tao Yang]
{quote}
ZooKeeper connection in ZKRMStateStore never be closed.
{quote}
IIUC the zookeer StateStore is not an active service and zookeeper connection
is common for leader election too.
Do we really need to close the connection ??
Few other issues in 3.1.1 which got fixed recently are YARN-9644,9639
> 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: Blocker
> 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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