Github user tnachen commented on the pull request:
https://github.com/apache/spark/pull/4170#issuecomment-71774383
@jongyoul So an executor can only "launch" one task at a time, but can have
multiple tasks running simultaneously as you mentioned.
It doesn't matter if they're all part of the same launchTasks message or
seperate, as long as the framework and executor id are the same it will be
launched in the same executor.
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