TaskTracker never stops cleanup threads, MiniMRCluster becomes unstable
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                 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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