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https://issues.apache.org/jira/browse/HADOOP-4202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12632255#action_12632255
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Chris K Wensel commented on HADOOP-4202:
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I think HADOOP-3546 is responsible for the change.
> TaskTracker never stops cleanup threads, MiniMRCluster becomes unstable
> -----------------------------------------------------------------------
>
> Key: HADOOP-4202
> URL: https://issues.apache.org/jira/browse/HADOOP-4202
> Project: Hadoop Core
> Issue Type: Bug
> Components: test
> Affects Versions: 0.18.0
> Reporter: Chris K Wensel
> Priority: Minor
>
> If many unit tests start/stop unique MiniMRCluster instances, over time the
> number of threads in the test vm grow to large causing tests to hang and/or
> slow down.
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