Github user sitalkedia commented on the issue:
https://github.com/apache/spark/pull/17297
cc - @kayousterhout - Addressed your earlier comment about
https://github.com/apache/spark/pull/12436 ignoring fetch failure from stale
map output. I have addressed this issue by adding epoch for each map output
registered, that way if the task's epoch is smaller than the epoch of the map
output, we can ignore the fetch failure. This also takes care of epoch changes
which will be triggered due to executor loss for a shuffle task when its
shuffle map task executor is gone as pointed out by @mridulm.
Let me know what you think of the approach.
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