masteryhx commented on code in PR #20313:
URL: https://github.com/apache/flink/pull/20313#discussion_r934182431


##########
flink-runtime/src/main/java/org/apache/flink/runtime/state/SharedStateRegistryImpl.java:
##########
@@ -365,4 +401,19 @@ public String toString() {
             return "EmptyDiscardStateObject{" + stateHandleID + '}';
         }
     }
+
+    private boolean preventsDiscardingCreatedCheckpoint(SharedStateEntry 
entry) {
+        // explicitly set by the backend, e.g. private state is reused
+        if (entry.preventDiscardingCreatedCheckpoint
+                && 
restoredCheckpointSharingStrategies.containsKey(entry.createdByCheckpointID)) {
+            return true;
+        }
+        // with NO_SHARING strategy, shared state, if any, is bundled inside 
the checkpoint folder
+        // noinspection RedundantIfStatement
+        if (NO_SHARING == 
restoredCheckpointSharingStrategies.get(entry.createdByCheckpointID)) {

Review Comment:
   Okay, Thanks for the clarification.
   You mean that `SharingFilesStrategy` only applys on runtime but not on 
recovery ?
   If so, why we need to clarify `NO_SHARING` here,  Do other strategies also 
need to contain these logics ?



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