Github user vanzin commented on the pull request:

    https://github.com/apache/spark/pull/3543#issuecomment-68758185
  
    Just for posterity: I think a couple of changes sneaked in between my 
original change being sent as a PR and it being commited, making my code miss 
some `Configuration` instantiations.
    
    At that time, I explicitly avoided changing default arguments to a few 
methods (since my thinking was that since it's an argument, the user should 
know what he's doing). But I don't really have an opinion about what's the 
right approach there, and changing it is fine with me.
    
    I also don't have enough background to comment on the thread-safety issues 
(others have looked at it in much more depth than I have)...


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