Github user tillrohrmann commented on the issue:
https://github.com/apache/flink/pull/2435
Thanks for the review @mxm. Concerning your questions:
1. Double checking is necessary due to concurrent accesses. Of course one
could also use locks but that way it is less blocking.
2. I'll add a test for the `unmonitoring`.
After adding the additional test, I'll merge this PR.
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