Github user squito commented on the pull request:

    https://github.com/apache/spark/pull/4964#issuecomment-78319536
  
    I was just discussing this w/ Hari a bit, the one issue w/ this PR is 
having a test case to demonstrate the old problem, verify the fix, & prevent 
regression.  We have our own test cases which do that, but they aren't easy to 
port over here -- they involve forcefully killing the app to prevent some of 
the normal nice cleanup to happen.  Hari is checking to see if he can port them 
over here.  (I'm not clear on all the detals -- writing up the synopsis since 
he's about to hop on a plane.)
    
    In any case, hopefully he'll find a better test case, or can elaborate on 
the difficulty.  But either way we're open to suggestions for testing.


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