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https://issues.apache.org/jira/browse/MAPREDUCE-7136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16611160#comment-16611160
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Jason Lowe commented on MAPREDUCE-7136:
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I would recommend opening a single ticket per maven project or even per JIRA
project if it's not too huge of a patch to address these. I agree fixing these
one at a time is going to be too much overhead. Be sure to call out that this
is a fix for JVM reuse tests (e.g.: run via IDE) and not a test failure seen by
running surefire, or people may get confused since they cannot reproduce it.
> TestMRAppMetrics should shutdown DefaultMetricsSystem after completion
> ----------------------------------------------------------------------
>
> Key: MAPREDUCE-7136
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7136
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: test
> Reporter: Oleksandr Shevchenko
> Assignee: Oleksandr Shevchenko
> Priority: Minor
> Fix For: 3.2.0
>
> Attachments: MAPREDUCE-7136.001.patch,
> image-2018-09-10-14-39-57-992.png
>
>
> TestMRAppMetrics should invoke shutdown method in DefaultMetricsSystem after
> completion. Since it can lead to failing other tests. For example,
> TestRMContainerAllocator#testReportedAppProgress fails when run after
> TestMRAppMetrics#testNames with the following error:
> {noformat}
> org.apache.hadoop.metrics2.MetricsException: Metrics source MRAppMetrics
> already exists!
> {noformat}
> !image-2018-09-10-14-39-57-992.png!
> We do not catch this on the trunk since the test
> TestRMContainerAllocator#testUnsupportedMapContainerRequirement run first and
> "DefaultMetricsSystem.shutdown();" invokes after completion. But since JUnit
> does not guarantee the order of the tests we should fix it.
> Also, this is affected by previous versions which run
> testReportedAppProgress first (I faced it on 2.7.0 version). And reproduced
> on the trunk.
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