Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/5063#issuecomment-93056104
@sryza @tnachen just so I understand, doesn't `spark.mesos.executor.cores`
refer to the number of cores used by the Spark executor launched to run a given
task? Why is it necessary to differentiate between the number of cores used by
the executor for running the task, and the number of cores used by it to do
other things? What are the differences in semantics between this and
`spark.executor.cores` exactly?
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