fredia commented on code in PR #19448:
URL: https://github.com/apache/flink/pull/19448#discussion_r874963782


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flink-runtime/src/main/java/org/apache/flink/runtime/state/SharedStateRegistryImpl.java:
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@@ -47,23 +50,33 @@ public class SharedStateRegistryImpl implements 
SharedStateRegistry {
     /** All registered state objects by an artificial key */
     private final Map<SharedStateRegistryKey, SharedStateEntry> 
registeredStates;
 
+    /** All registered checkpoints */
+    private final Set<CompletedCheckpoint> registeredCheckpoints;

Review Comment:
   I replace `Set<CompletedCheckpoint>` with `Map<Long, CompletedCheckpoint>` 
temporarily. 
   
   > Do you think it could/should be refactored so that 
CompletedCheckpointStore "transfers the ownership" of subsumed checkpoints to 
SharedStateRegistry?
   > E.g. by passing them to unregisterUnusedState.
   
   I think it would work well, I would try to pass 
`DefaultCompletedCheckpointStore.completedCheckpoints` to unregisterUnusedState 
later.



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