[flink] Preserve complete undo recovery state across restarts - #3839
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Keep checkpoint baselines separate from each recovery work set. Rebase offsets after Undo, make scanner progress bounded and route offset reports to the correct runtime subtask.
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Keep checkpoint baselines separate from each recovery work set. Rebase offsets after Undo, make scanner progress bounded and route offset reports to the correct runtime subtask.
Purpose
Linked issue: close #3838 3838
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