Github user vanzin commented on the pull request:

    https://github.com/apache/spark/pull/11570#issuecomment-197569435
  
    BTW, a different approach where the list of known configs is kept by the 
code in `o.a.s.internal.config` would make this change simpler. The main reason 
I didn't do that is because initialization of these conf variables relies on 
triggering static initialization of classes, which may not happen in all cases, 
so there might be missed duplicates.


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