juhuan commented on code in PR #8778:
URL: https://github.com/apache/rocketmq/pull/8778#discussion_r1847680966


##########
client/src/main/java/org/apache/rocketmq/client/impl/factory/MQClientInstance.java:
##########
@@ -839,8 +839,8 @@ public boolean updateTopicRouteInfoFromNameServer(final 
String topic, boolean is
                         log.warn("updateTopicRouteInfoFromNameServer 
Exception", e);
                     }
                 } catch (RemotingException e) {
-                    log.error("updateTopicRouteInfoFromNameServer Exception", 
e);
-                    throw new IllegalStateException(e);
+                    log.error("updateTopicRouteInfoFromNameServer Exception, 
namesrvAddr: " + clientConfig.getNamesrvAddr(), e);

Review Comment:
   This errorMessage string is always being constructed. How about if I change 
it to the following code?
   ```java
   String errorMessage = String.format("updateTopicRouteInfoFromNameServer 
Exception, namesrvAddr: %s", clientConfig.getNamesrvAddr());
   log.error(errorMessage, e);
   throw new IllegalStateException(errorMessage, e);
   ```



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