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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