Myasuka commented on a change in pull request #16582:
URL: https://github.com/apache/flink/pull/16582#discussion_r678136476



##########
File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/checkpoint/CheckpointCoordinator.java
##########
@@ -1243,6 +1250,29 @@ private void completePendingCheckpoint(PendingCheckpoint 
pendingCheckpoint)
                         CheckpointFailureReason.FINALIZE_CHECKPOINT_FAILURE,
                         exception);
             }
+
+            try {
+                
allPreviousCheckpoints.removeAll(completedCheckpointStore.getAllCheckpoints());
+                if (!allPreviousCheckpoints.isEmpty()) {

Review comment:
       Yes, I agree that the returned subsumed checkpoint might be null, but I 
can't see why we need to add a separate method? If so, who will call the 
original `addCheckpoint` method?




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