rkhachatryan commented on a change in pull request #18391:
URL: https://github.com/apache/flink/pull/18391#discussion_r794749336



##########
File path: 
flink-state-backends/flink-statebackend-changelog/src/main/java/org/apache/flink/state/changelog/ChangelogStateBackend.java
##########
@@ -271,7 +273,7 @@ public StateBackend configure(ReadableConfig config, 
ClassLoader classLoader)
                                 keyedStateHandle instanceof 
ChangelogStateBackendHandle
                                         ? (ChangelogStateBackendHandle) 
keyedStateHandle
                                         : new ChangelogStateBackendHandleImpl(
-                                                
singletonList(keyedStateHandle),
+                                                
singletonMap(UUID.randomUUID(), keyedStateHandle),

Review comment:
       The default is `NO_CLAIM` but it's not supported (artefact copying not 
implemented).
   `CLAIM` has the above problem.
   Are you proposing to support only the `LEGACY` mode for now?




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