Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/11012#issuecomment-178785689
> An alternative option might be to track unroll/pending unroll memory
based on block ID rather than task attempt ID.
I think you need to account for this on a per-task rather than per-block
basis in order to enforce fair sharing of memory between concurrently-running
tasks.
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