Github user andrewor14 commented on the pull request: https://github.com/apache/spark/pull/731#issuecomment-71403791 @CodingCat Thanks for doing this and sorry for the delay. I haven't dug into the detail of `startMultiExecutorPerWorker`. Also, I don't see why we need a separate config to enable this. If we don't set the max cores per executor, then I think it's OK to assume that the executor will take all the cores (i.e. the max cores per executor defaults to Int.MaxValue or something, which would be the same as old behavior). If we do this, then do we still need to differentiate `startMultiExecutorPerWorker` and `startSingleExecutorPerWorker`?
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