rkhachatryan commented on a change in pull request #11491: 
[FLINK-16513][checkpointing] Unaligned checkpoints: checkpoint metadata
URL: https://github.com/apache/flink/pull/11491#discussion_r397456046
 
 

 ##########
 File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/checkpoint/metadata/MetadataV3Serializer.java
 ##########
 @@ -115,4 +120,31 @@ protected OperatorState 
deserializeOperatorState(DataInputStream dis) throws IOE
 
                return operatorState;
        }
+
+       @VisibleForTesting
+       @Override
+       public void 
serializeResultSubpartitionStateHandle(ResultSubpartitionStateHandle handle, 
DataOutputStream dos) throws IOException {
+               channelStateHandleSerializer.serialize(handle, dos);
+       }
+
+       @VisibleForTesting
+       @Override
+       public ResultSubpartitionStateHandle 
deserializeResultSubpartitionStateHandle(DataInputStream dis) throws 
IOException {
+               final boolean hasResultSubpartitionStateHandle = dis.readInt() 
!= 0;
 
 Review comment:
   Backward compatibility is maintained on a snapshot level (by having version 
number at the beginning of it). This check is for cases when there is no state 
(same approach as for other parts of the state).

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