Github user rmetzger commented on the issue:
https://github.com/apache/flink/pull/2386
I got some offline feedback from @aljoscha regarding the change to
implement the methods required by `OneInputStreamOperator` and
`TwoInputStreamOperator` in `AbstractStreamOperator` to avoid "polluting" all
the custom operators.
I'm currently working on fixing the `EventTimeWindowCheckpointingITCase`,
which seems to be failing more frequently due to my change.
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