Github user JoshRosen commented on the pull request:

    https://github.com/apache/spark/pull/2337#issuecomment-57572402
  
    I've given it some thought and I don't think that we should merge the more 
general async. mechanism that I described in #2482.  It had some confusing 
semantics surrounding cancellation (see the discussion of Thread.interrupt) and 
was probably more general than what most users need.
    
    Given that we should probably keep the current async APIs, this PR's change 
looks good.  I'm going to merge this into `master`.  Thanks for this commit and 
sorry for the long review delay!


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