Github user holdenk commented on the pull request: https://github.com/apache/spark/pull/10962#issuecomment-176323543 Looking at params.scala shouldOwn uses a require which we should probably stay consistent with (not saying we _shouldn't_ change it per-se just if we do we should change both). I think throwing an exception is more reasonable for shouldOwn since its only an internal use but hasParam is external facing.
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