Github user tnachen commented on the pull request:
https://github.com/apache/spark/pull/4027#issuecomment-85652752
@andrewor14 it's true if you don't cap the maximum cores then the first one
will freely grab whatever it can. I think what I can do is that to ensure a
user that set the max executors > 1 must also configure the max executor cores,
and if they didn't I'll throw a exception to fail fast.
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