Github user jaceklaskowski commented on the issue:
https://github.com/apache/spark/pull/16475
Partially agree @srowen. The reason for the change was `blockId.isShuffle`
condition that both methods use to do their shuffle-specific handling. The
change might not be the most correct one but I'm sure something's wrong here,
but can't nail it and hence the change to review this part of shuffle system.
> "is a distant problem waiting to happen"
I was concerned about that too, but that's what the tests are supposed to
cover. If there are few missing, they should be added, shouldn't they?
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