rbalamohan opened a new pull request #52: TEZ-4087: Shuffle: Fix shuffle 
cleanup to prevent thread leaks
URL: https://github.com/apache/tez/pull/52
 
 
   Merger threads are not killed in long running daemons. Work is in progress 
to mine the logs of long running daemons. As of now, all tasks are effectively 
cleaning up. However, from tez side, it would be good to have a feature where 
merger threads stop if the parent thread dies.
   
   Changes:
   
   1. Pass ShuffleScheduler detail to merger threads
   2. Add attempt_id detail to merger threads. This would help in identifying 
thread details. As of now, only vertex name is populated which is not very 
useful.
   3. In merger thread, periodically check if the parent thread is alive. 
   

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