Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/6648#issuecomment-147553320
BTW, with that design, I also wouldn't even implement the delete message in
the first patch, unless we've actually seen block corruptions happen; but it
sounds like we haven't seen such things and we probably wouldn't have a great
way to detect them now anyway (i.e. the reduce task would mark a fetch
successful and just crash).
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