Github user pwendell commented on the pull request: https://github.com/apache/spark/pull/4012#issuecomment-70395228 @sarutak when we added the netty shuffle we actually decided not to expose these in order to keep the overall # of configurations manageable. We couldn't think of a user scenario where these would make a large difference (correct me if that is wrong @aarondav). Did you have a specific use case in mind, or was this mostly for completeness reasons?
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