Jason Lowe created YARN-3620:

             Summary: MetricsSystemImpl fails to show backtrace when an error 
                 Key: YARN-3620
                 URL: https://issues.apache.org/jira/browse/YARN-3620
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: Jason Lowe
            Assignee: Jason Lowe

While investigating YARN-3619 it was frustrating that MetricsSystemImpl was 
logging a ConcurrentModificationException but without any backtrace.  Logging a 
backtrace would be very beneficial to tracking down the cause of the problem.

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