zhijiangW commented on a change in pull request #11507: [FLINK-16587] Add basic 
CheckpointBarrierHandler for unaligned checkpoint
URL: https://github.com/apache/flink/pull/11507#discussion_r400829024
 
 

 ##########
 File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/consumer/InputGate.java
 ##########
 @@ -107,6 +107,20 @@
                return availabilityHelper.getAvailableFuture();
        }
 
+       /**
+        * Returns the index of this gate in respect to the consuming operator 
instance.
+        */
+       public int getGateIndex() {
+               throw new UnsupportedOperationException();
 
 Review comment:
   I guess we can remove it from `InputGate` and only implement it inside 
`SingleInputGate` because all the usages currently are referring to the 
`SingleInputGate`, e.g. in `UnionInputGate` arguments and `InputChannel` 
component.

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