Github user jdesmet commented on a diff in the pull request:
https://github.com/apache/spark/pull/9095#discussion_r61675971
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnAllocator.scala ---
@@ -395,6 +395,10 @@ private[yarn] class YarnAllocator(
val executorId = executorIdCounter.toString
assert(container.getResource.getMemory >= resource.getMemory)
--- End diff --
Note that wrong vcore accounting in Yarn can affect system integrity due to
over-scheduling the CPU. It is mandatory to have this working correctly if
spark has to play a nice citizen on yarn (together with other scheduled apps or
itself).
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