Support checkpoint GC in leader for mode stateful operators - #1112
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Jul 27, 2026
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This PR follows on the initial support for checkpoint GC in leader mode for stateless operators (#1076) by adding support for stateful operators as well. Stateful operators are much more complex to GC, because their state may be stored over many checkpoints. GC thus requires reachability analysis: we must determine that a state file is no longer reachable from any active checkpoint root before it may be deleted.
We do lose some of the nicer memory bounding properties of the previous implementation, which took a streaming approach to cleaning checkpoints, but that is largely unavoidable.