Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/3633
Thanks for this refactoring. I had only a quick look so far, but one
thought was that this patch could probably be simplified by making
`triggerCheckpoint()` (and restore / notifyComplete) not abstract in the
`AbstractInvokable`. Instead let it throw the `UnsupportedOperationException`.
That way, we avoid refactoring all the test classes to implement those
methods (which would be nice).
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