Github user senorcarbone commented on the issue: https://github.com/apache/flink/pull/1668 Thanks for the review @gyfora and @StephanEwen , these are very good points. @StephanEwen makes sense to not really index/keep metadata of individual records in log slices, it is extra overhead. Writing raw operator state makes sense, so I will do that once @StefanRRichter gives me some pointers, that would be great. Any redistribution of the checkpoint slices would violate causality so I hope the "list redistribution pattern" actually keeps the set of registered operator states per instance intact. The garbage collection issue still remains but maybe (if @StefanRRichter approves) I can add an `unregister` functionality to the `OperatorStateStore`. I can also add preconfigured operators (not that they will be reused anywhere). It is more clean but I really need to see how can I get full control of the `task` checkpointing behaviour from the `operator` level (since the default task checkpointing behaviour is altered at the task-level).
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