Github user markhamstra commented on the pull request:
https://github.com/apache/spark/pull/8427#issuecomment-134753462
I wasn't intending to answer "no", but rather just wanting to make sure
that we think through the implications of this change. It will increase memory
pressure some, but I agree that it shouldn't be a lot because of the already
present references via the MapOutputTracker. On balance, I'm inclined to agree
with you that this is worth doing.
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