Github user mridulm commented on the pull request:
https://github.com/apache/spark/pull/2187#issuecomment-53900710
A closed writer can be reverted in case some other writer's close fails in
the shuffle group and we have to revert the entire group.
Particularly relevant when we have consolidated shuffle.
Yes, close should be idempotent - which is not the case here : each close
will add to metrics
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