dawidwys commented on a change in pull request #17440:
URL: https://github.com/apache/flink/pull/17440#discussion_r732625408



##########
File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/netty/NettyPartitionRequestClient.java
##########
@@ -195,22 +195,26 @@ public void operationComplete(ChannelFuture future) 
throws Exception {
 
     @Override
     public void notifyCreditAvailable(RemoteInputChannel inputChannel) {
-        clientHandler.notifyCreditAvailable(inputChannel);
+        sendToChannel(new AddCreditMessage(inputChannel));
     }
 
     @Override
     public void notifyNewBufferSize(RemoteInputChannel inputChannel, int 
bufferSize) {
-        clientHandler.notifyNewBufferSize(inputChannel, bufferSize);
+        sendToChannel(new NewBufferSizeMessage(inputChannel, bufferSize));
     }
 
     @Override
     public void resumeConsumption(RemoteInputChannel inputChannel) {
-        clientHandler.resumeConsumption(inputChannel);
+        sendToChannel(new ResumeConsumptionMessage(inputChannel));
     }
 
     @Override
     public void acknowledgeAllRecordsProcessed(RemoteInputChannel 
inputChannel) {
-        clientHandler.acknowledgeAllRecordsProcessed(inputChannel);
+        sendToChannel(new AcknowledgeAllRecordsProcessedMessage(inputChannel));
+    }
+
+    private void sendToChannel(ClientOutboundMessage message) {
+        tcpChannel.eventLoop().execute(() -> 
tcpChannel.pipeline().fireUserEventTriggered(message));

Review comment:
       I am fine merging it as is. However, I am curious myself if it was/is 
necessary (I could not find an answer, but I have not searched for long). But, 
I am not too familiar with how netty works.
   
   BTW, I've just looked into it again and if I go into: 
`ChannelPipeline#fireUserEventTriggered` -> 
`DefaultPipeline#fireUserEventTriggered` -> 
`AbstractChannelHandlerContext.invokeUserEventTriggered(this.head, event);` I 
can see a code like this:
   
   ```
       static void invokeUserEventTriggered(final AbstractChannelHandlerContext 
next, final Object event) {
           ObjectUtil.checkNotNull(event, "event");
           EventExecutor executor = next.executor();
           if (executor.inEventLoop()) {
               next.invokeUserEventTriggered(event);
           } else {
               executor.execute(new Runnable() {
                   public void run() {
                       next.invokeUserEventTriggered(event);
                   }
               });
           }
   
       }
   ```
   
   which would indicate submitting it explicitly from the `eventLoop` is 
unnecessary. 




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