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https://issues.apache.org/jira/browse/YARN-4563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15093329#comment-15093329
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Akira AJISAKA commented on YARN-4563:
-------------------------------------

Thanks [~rohithsharma] for your comment.
bq. Branch-2.6 might need to port this issue.
ContainerMetrics doesn't exist in branch-2.6, so there's no need to backport 
this issue.

> ContainerMetrics deadlocks
> --------------------------
>
>                 Key: YARN-4563
>                 URL: https://issues.apache.org/jira/browse/YARN-4563
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: nodemanager
>         Environment: HDP 2.3.2 (Hadoop 2.7.1 + patches)
>            Reporter: Akira AJISAKA
>            Priority: Blocker
>         Attachments: 0001-YARN-4563.patch, jstack.log
>
>
> On one of our environment, some NodeManagers' webapp do not working. I found 
> a dead lock in the thread dump.
> {noformat}
> Found one Java-level deadlock:
> =============================
> "1193752357@qtp-907815246-22238":
>   waiting to lock monitor 0x0000000005e20a18 (object 0x00000000f6afa048, a 
> org.apache.hadoop.yarn.server.nodemanager.containermanager.monitor.ContainerMetrics),
>   which is held by "2107307914@qtp-907815246-19994"
> "2107307914@qtp-907815246-19994":
>   waiting to lock monitor 0x0000000001a000a8 (object 0x00000000d4f1e1f8, a 
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl),
>   which is held by "Timer for 'NodeManager' metrics system"
> "Timer for 'NodeManager' metrics system":
>   waiting to lock monitor 0x00000000027ade88 (object 0x00000000f6582df0, a 
> org.apache.hadoop.yarn.server.nodemanager.containermanager.monitor.ContainerMetrics),
>   which is held by "1530638165@qtp-907815246-19992"
> "1530638165@qtp-907815246-19992":
>   waiting to lock monitor 0x0000000001a000a8 (object 0x00000000d4f1e1f8, a 
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl),
>   which is held by "Timer for 'NodeManager' metrics system"
> {noformat}



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