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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