Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/4051#issuecomment-71511857
It feels like it would be better to have "# of NMs" executors with many
cores than "> # of NMs" executors with less cores.
Unless your plan is that we should prefer lots of small executors launched
on demand, in lieu of the current approach people take of launching larger
executors.
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