superhx commented on code in PR #6606:
URL: https://github.com/apache/rocketmq/pull/6606#discussion_r1170723615


##########
client/src/main/java/org/apache/rocketmq/client/impl/producer/DefaultMQProducerImpl.java:
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@@ -534,6 +535,13 @@ public void executeAsyncMessageSend(Runnable runnable, 
final Message msg, final
         boolean isSemaphoreAsyncNumAquired = false;
         boolean isSemaphoreAsyncSizeAquired = false;
         int msgLen = msg.getBody() == null ? 1 : msg.getBody().length;
+        if (msgLen > 
this.getDefaultMQProducer().getBackPressureForAsyncSendSize()) {

Review Comment:
   I think origin checks is correct:
   - when inflight messages buffer is larger than backPressureForAsyncSendSize, 
it suggests client send too fast than broker can take , client should fast 
return RemotingTooMuchRequestException.
   - when single message serialized size is larger than maxMessageSize, client 
should return MESSAGE_ILLEGAL.



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