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https://issues.apache.org/jira/browse/YARN-3619?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Karthik Kambatla reassigned YARN-3619:
--------------------------------------

    Assignee: zhihai xu  (was: Karthik Kambatla)

Zhihai pinged me offline mentioning he knows the root cause behind this. [~zxu] 
- assigning this to you. 

> 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
>
> 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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