pnowojski commented on a change in pull request #13565:
URL: https://github.com/apache/flink/pull/13565#discussion_r503350616



##########
File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/checkpoint/PendingCheckpoint.java
##########
@@ -531,6 +527,30 @@ private void dispose(boolean releaseState, 
CheckpointsCleaner checkpointsCleaner
                }
        }
 
+       @Override
+       public void discard() {
+               synchronized (lock) {
+                       if (stateDiscarded) {
+                               Preconditions.checkState(discarded, "Checkpoint 
should be disposed before being discarded");
+                               return;
+                       } else {
+                               stateDiscarded = true;
+                       }
+               }

Review comment:
       Why do we need this check now? As far as I can tell, previously it was 
not needed?




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