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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