humkum commented on code in PR #5845:
URL: https://github.com/apache/rocketmq/pull/5845#discussion_r1069264012


##########
client/src/main/java/org/apache/rocketmq/client/producer/DefaultMQProducer.java:
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@@ -72,7 +72,8 @@ public class DefaultMQProducer extends ClientConfig 
implements MQProducer {
         ResponseCode.SYSTEM_ERROR,
         ResponseCode.NO_PERMISSION,
         ResponseCode.NO_BUYER_ID,
-        ResponseCode.NOT_IN_CURRENT_UNIT
+        ResponseCode.NOT_IN_CURRENT_UNIT,
+        ResponseCode.SYSTEM_BUSY

Review Comment:
   > System busy means server is overload, why we need retry send message?
   
   To make sure message which send failed can retry to send to another brokers. 
One cluster might have many brokers, and it is not too possible that all 
brokers are `SYSTEM_BUSY` at the same time.



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