Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/8649#issuecomment-138708571
> Wouldn't it make more sense to check for this in SparkSubmitArguments or
maybe the yarn specific validation code?
I'm not sure there's a common enough place where you could call this code,
at least without reflection. You could try to copy it, but duplicated code is
bad. In any case, this should only really affect Spark developers, so while
it's nice to have a better message, we shouldn't need to be too fancy here.
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