Github user jongyoul commented on the pull request:
https://github.com/apache/spark/pull/4170#issuecomment-71775404
@tnachen @mateiz So sorry for taking up a lot of time. I've found that only
one executor as a process runs at any time, and I understand executor can have
multiple tasks at the same time. I've believed each executor is launched
separately when driver launchTasks.
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