Github user CodingCat commented on the pull request: https://github.com/apache/spark/pull/7532#issuecomment-125180733 if yes, my concern is just on this; this approach requires the user to explicitly call killExecutors to `truly` release resources for others to use...that means, the user always needs to call `requestTotalExecutor` (with a smaller value) and `killExecutors` together...this makes it fishy in terms of the API design....
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