Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/1481#issuecomment-51000600
I guess the current name isn't _that_ bad because technically this external
aggregation does occur during a shuffle, although it's not exactly the write of
the shuffle data itself. In any case I think making it not an option is a good
call... hopefully it will simplify things.
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