Github user tnachen commented on the pull request: https://github.com/apache/spark/pull/4027#issuecomment-92657307 I see, only concern for me is that if we enforce this setting in mesos coarse Grain mode, then all existing users with most likely see a decrease of performance given there are less executors launched than before. If spark.executor.cores is an optional setting than I am fine using it for now and let users specify how many executors they like to launch per slave in coarse grain mode.
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