Github user vanzin commented on the pull request:

    https://github.com/apache/spark/pull/12641#issuecomment-214811893
  
    > I think the scheduler and backend creation may depend on the masterURL
    
    Yeah but that's already available in the SparkContext. It just feels 
redundant (as in, what's the difference between `sc.master` and the explicit 
`masterURL` argument).
    
    But then the whole API feels a little weird, so it would be better to 
address the weirdness as a whole.


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