gaoyunhaii commented on a change in pull request #16655:
URL: https://github.com/apache/flink/pull/16655#discussion_r686116617



##########
File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/checkpoint/OperatorSubtaskState.java
##########
@@ -59,6 +60,8 @@
 
     private static final Logger LOG = 
LoggerFactory.getLogger(OperatorSubtaskState.class);
 
+    public static final OperatorSubtaskState FINISHED = new 
OperatorSubtaskState(true);
+
     private static final long serialVersionUID = -2394696997971923995L;

Review comment:
       Yes, since users may upgrade from the older version, we might need to 
keep the compatibility. 
   
   But to avoid unexpected problems I change the implementation to not modify 
this class, but introduce a new `FinishedOperatorSubtaskState` subclass 
specially.




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