Github user vanzin commented on the pull request:

    https://github.com/apache/spark/pull/8668#issuecomment-142369819
  
    The change LGTM; I'd be more comfortable if there was a unit test for this 
code, but I tried to craft one and `CoarseGrainedSchedulerBackend` is not very 
unit-testable at all. Perhaps that's something to look at, given how hard it is 
to grok this code.


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