Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/4254
I think this is a meaningful fix.
I would suggest to do the tests different, though. The tests of the
CheckpointCoordinator overdo the mockito stuff so heavily that it becomes an
extremely hard job to change anything in the CheckpointCoordinator. Mocks are
super maintenance heavy, compared to actual test implementations of interfaces
or classes.
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