Github user lirui-intel commented on the pull request:
https://github.com/apache/spark/pull/1328#issuecomment-48421136
Thanks @sryza for the idea. I think it's OK to piggy back the communication
in a heartbeat, but we should also allow the worker to explicitly ask the
master for map statuses when a task demands more outputs. I'll look into it
once you have that feature merged.
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