Jason Lowe created YARN-3619:

             Summary: 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

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 
2015-05-11 14:00:20,360 [Timer for 'NodeManager' metrics system] WARN 
impl.MetricsSystemImpl: java.util.ConcurrentModificationException

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