Steve Loughran updated YARN-4264:
    Priority: Blocker  (was: Major)

> In-VM test ATS instances fail with metrics already registered
> -------------------------------------------------------------
>                 Key: YARN-4264
>                 URL: https://issues.apache.org/jira/browse/YARN-4264
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: timelineserver
>    Affects Versions: 2.8.0
>            Reporter: Steve Loughran
>            Priority: Blocker
> 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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