Github user tomwhite commented on the pull request:

    https://github.com/apache/spark/pull/7014#issuecomment-122012446
  
    Thanks for all the feedback @pwendell, @squito, and @kayousterhout. I've 
addressed all your points and updated this PR.
    
    @squito Regarding `JsonProtocol`, I can't see a way of serializing the 
fields of an arbitrary user exception class to JSON and the reconstituting 
them, so I agree that putting it as `None` is the right way to go. The stack 
trace and message will be preserved in the same way that they currently are 
though.


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