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https://issues.apache.org/jira/browse/MAPREDUCE-5086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13616649#comment-13616649
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jian he commented on MAPREDUCE-5086:
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Jason, if overriding createJob for test, the createJob is called in start(),if
we run several test cases, start() is called multiple times, and it'll raise
exception because of "DefaultMetricsSystem.initialize("MRAppMaster")", the
following tests will fail because MRAppMetrics already exists.
> MR app master deletes staging dir when sent a reboot command from the RM
> ------------------------------------------------------------------------
>
> Key: MAPREDUCE-5086
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5086
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: jian he
> Assignee: jian he
> Attachments: YARN-472.1.patch, YARN-472.2.patch, YARN-472.3.patch,
> YARN-472.4.patch, YARN-472.5.patch, YARN-472.6.patch
>
>
> If the RM is restarted when the MR job is running, then it sends a reboot
> command to the job. The job ends up deleting the staging dir and that causes
> the next attempt to fail.
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