Github user vanzin commented on the pull request:

    https://github.com/apache/spark/pull/7253#issuecomment-121023137
  
    > the case when a1 is completed, and a2 is incomplete if a1 start times 
before a2
    
    That case does not exist. If `a1` starts and completes, `a2` would not 
exist.


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