Github user jerryshao commented on the pull request:
https://github.com/apache/spark/pull/9095#issuecomment-216407536
@jdesmet , by default if cpu scheduling is not enabled in yarn, what you
saw on yarn's web UI about vcore usage (1 per container) is actually
meaningless, I think that makes you confuse because what you specified is a
different number, but there in yarn it only shows 1 core.
This is only a yarn ui issue that is quite misleading if cpu scheduling is
not enabled, internally in yarn's scheduling all the resource accounting is
correct.
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