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https://issues.apache.org/jira/browse/YARN-3619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14937044#comment-14937044
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Hadoop QA commented on YARN-3619:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | patch |   0m  0s | The patch command could not apply 
the patch during dryrun. |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12733882/YARN-3619.000.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 6c17d31 |
| Console output | 
https://builds.apache.org/job/PreCommit-YARN-Build/9311/console |


This message was automatically generated.

> ContainerMetrics unregisters during getMetrics and leads to 
> ConcurrentModificationException
> -------------------------------------------------------------------------------------------
>
>                 Key: YARN-3619
>                 URL: https://issues.apache.org/jira/browse/YARN-3619
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: nodemanager
>    Affects Versions: 2.7.0
>            Reporter: Jason Lowe
>            Assignee: zhihai xu
>         Attachments: YARN-3619.000.patch, test.patch
>
>
> ContainerMetrics is able to unregister itself during the getMetrics method, 
> but that method can be called by MetricsSystemImpl.sampleMetrics which is 
> trying to iterate the sources.  This leads to a 
> ConcurrentModificationException log like this:
> {noformat}
> 2015-05-11 14:00:20,360 [Timer for 'NodeManager' metrics system] WARN 
> impl.MetricsSystemImpl: java.util.ConcurrentModificationException
> {noformat}



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