dawidwys commented on a change in pull request #15055:
URL: https://github.com/apache/flink/pull/15055#discussion_r662811609



##########
File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/partition/consumer/RecoveredInputChannel.java
##########
@@ -205,6 +205,12 @@ public void resumeConsumption() {
         throw new UnsupportedOperationException("RecoveredInputChannel should 
never be blocked.");
     }
 
+    @Override
+    public void acknowledgeAllRecordsProcessed() throws IOException {
+        throw new UnsupportedOperationException(
+                "RecoveredInputChannel should not need acknowledge all records 
processed.");
+    }
+

Review comment:
       Ok, so what I said in 
https://github.com/apache/flink/pull/15055#discussion_r662031701 is actually 
already the current state. I second @gaoyunhaii it should work correctly the 
way it is. Basically, the `EndOfUserRecordsEvent` will never be in the 
input/output buffers during restoring.
   
   As for an ITCase, I think it makes sense once we have all building blocks in 
place.




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