Github user davies commented on the pull request:
https://github.com/apache/spark/pull/5096#issuecomment-85606019
@redbaron @oscaroboto This quetion also applies to all the languages of
Spark. One executor can have multiple allocated cores, each task also can
consume one or more CPUs. A task consumes one cpu by default, it can be changed
by `spark.task.cpus`.
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