TaskTracker directoryCleanupThread never gets terminated
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                 Key: HADOOP-3727
                 URL: https://issues.apache.org/jira/browse/HADOOP-3727
             Project: Hadoop Core
          Issue Type: Bug
          Components: mapred
    Affects Versions: 0.19.0
            Reporter: Steve Loughran
            Priority: Minor


When a task tracker starts its work it calls startCleanupThreads() to create a 
directoryCleanupThread.

only, that thread is never terminated; it runs for the life of the process. 

It should be terminated when the TaskTracker itself is terminated, presumably 
after it has done the last cleanup. 


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