yunfengzhou-hub commented on code in PR #23927:
URL: https://github.com/apache/flink/pull/23927#discussion_r1433735764


##########
flink-runtime/src/test/java/org/apache/flink/runtime/io/network/netty/CancelPartitionRequestTest.java:
##########
@@ -100,7 +102,12 @@ void testCancelPartitionRequest() throws Exception {
             Channel ch = connect(serverAndClient);
 
             // Request for non-existing input channel => results in cancel 
request

Review Comment:
   This test class mainly verifies cases when the input channel does not exist, 
as shown in `CreditBasedPartitionRequestClientHandler`
   ```java
   RemoteInputChannel inputChannel = inputChannels.get(announcement.receiverId);
   if (inputChannel == null || inputChannel.isReleased()) {
       cancelRequestFor(announcement.receiverId);
       return;
   }
   ```
   Thus the comment here has been correct.



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