Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/3773
Thanks you @shuai-xu for checking this. Merging this for 1.3, together with
the updates proposed by you.
I think we need to initially make a small change that non-pipelined
exchanges are NOT boundaries of failover regions, until we have the enhancement
in that triggers upstream region restart when a result could not be fetched.
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