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https://issues.apache.org/jira/browse/MAPREDUCE-4494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13424430#comment-13424430
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Ahmed Radwan commented on MAPREDUCE-4494:
-----------------------------------------
The problem seems to be that rm is not stopped at the end of testHeadroom().
Here is a patch, I have confirmed that the test now successfully runs.
> TestFifoScheduler failing with Metrics source QueueMetrics,q0=default already
> exists!
> -------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-4494
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4494
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2, test
> Affects Versions: 2.0.0-alpha
> Reporter: Ahmed Radwan
> Assignee: Ahmed Radwan
>
> TestFifoScheduler is failing:
> {code}
> Running org.apache.hadoop.yarn.server.resourcemanager.TestFifoScheduler
> Tests run: 5, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 14.614 sec
> <<< FAILURE!
> Results :
> Tests in error:
> test(org.apache.hadoop.yarn.server.resourcemanager.TestFifoScheduler):
> Metrics source QueueMetrics,q0=default already exists!
> {code}
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