Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/731#issuecomment-92532203
@CodingCat We shouldn't have to worry about the case when the user asks for
more resources per executors than are available on the cluster. If each machine
only has 2 cores the user shouldn't ask for 3 per executor. This holds
regardless of whether spread out mode is used, since an executor cannot be
"split" across machines. The existing approach is fine.
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