Github user WangTaoTheTonic commented on the pull request:
https://github.com/apache/spark/pull/1106#issuecomment-54928936
@markhamstra Thanks for pointing out the shuffle problem. I tested and the
result proved that you are right on this.
As for the keeping not alive workers question, I thought the filter will
create a copy of workers so decided to filter in iteration. It is a time-space
tradeoff.
Now since the worker HashSet should be transfered to Seq before shuffle, we
could put filter before shuffle as you said.
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