Github user shixiaogang commented on the issue:
https://github.com/apache/flink/pull/3801
Hi @StefanRRichter Thanks a lot for you pointing out the problem the
suggestion for the fix. I have updated the PR as suggested. A
`CloseableRegistry` is used to track opened i/o streams now. And the opened i/o
streams are closed first in the cancellation.
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