Steve Loughran created YARN-4264:

             Summary: In-VM test ATS instances fail with metrics already 
                 Key: YARN-4264
             Project: Hadoop YARN
          Issue Type: Bug
          Components: timelineserver
    Affects Versions: 2.8.0
            Reporter: Steve Loughran

Testing my SPARK-1537 code against branch-2 triggers stack traces due to failed 
attempts to re-register metrics. This is with code which works against 2.7.1, 
so it's a regression.

Either the timeline server needs to unregister its metrics on shutdown, or ATS 
adds an option to disable metrics for test purposes.

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