Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/9095#issuecomment-216305430
> why we can't report the correct vCores
@jdesmet Spark is not reporting anything, and that's the part you are
confused about. YARN does all its accounting correctly. If Spark were able to
influence YARN's accounting, that would be a huge bug in YARN.
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