rkhachatryan commented on a change in pull request #18297:
URL: https://github.com/apache/flink/pull/18297#discussion_r784256807



##########
File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/state/changelog/ChangelogStateHandleStreamImpl.java
##########
@@ -83,11 +80,7 @@ public KeyedStateHandle getIntersection(KeyGroupRange 
keyGroupRange) {
 
     @Override
     public void discardState() throws Exception {
-        // discard only on TM; on JM, shared state is removed on subsumption
-        if (stateRegistry == null) {
-            bestEffortDiscardAllStateObjects(
-                    handlesAndOffsets.stream().map(t2 -> 
t2.f0).collect(Collectors.toList()));
-        }
+        // do nothing: rely on SharedStateRegistry for cleanup after ACK;

Review comment:
       The in-memory object will be GCed on checkpoint subsumption;
   The actual handles will be discarded by `SharedStateRegistry` when no longer 
used (they are registered in `registerSharedStates`).




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