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Preview https://flink-packages.org/packages/heap-backend-incremental-checkpointsReleased:
Please keep the discussion on the mailing list rather than commenting on the wiki (wiki discussions get unwieldy fast).
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3. Changelogging involves synchronous serialization on each state access
4. Journalling allows for even smaller increments for collection-typed state (e.g. snapshotting only the appended ListState values rather than the whole list)
On the other hand, integration with FLIP-158 would allow "background" materialization, eliminating periodic full checkpoints (or more complex way to achieve this).
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