Github user tnachen commented on the pull request:
https://github.com/apache/spark/pull/5063#issuecomment-93105439
What @sryza is correct. spark.mesos.executor.cores is different than
spark.executor.cores, as it's only the cpu cores used for the mesos executor,
which is used to launch Spark executors and those executors are tied to tasks
and have its own cpu allocation.
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