Github user jerryshao commented on the pull request:
https://github.com/apache/spark/pull/9095#issuecomment-147727046
But from yarn's side actually only allocated 1 vcores, whereas in the
driver side, it notified with more than 1 cores when executor get registered,
this is not consistent and break the semantic of "resource", driver will
schedule more than 1 tasks to this executor simultaneously, but the actual
parallelism is only 1.
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