15712852007 commented on code in PR #4562:
URL: https://github.com/apache/rocketmq/pull/4562#discussion_r915487114


##########
client/src/main/java/org/apache/rocketmq/client/impl/producer/DefaultMQProducerImpl.java:
##########
@@ -671,8 +676,18 @@ private SendResult sendDefaultImpl(
     private TopicPublishInfo tryToFindTopicPublishInfo(final String topic) {
         TopicPublishInfo topicPublishInfo = 
this.topicPublishInfoTable.get(topic);
         if (null == topicPublishInfo || !topicPublishInfo.ok()) {
-            this.topicPublishInfoTable.putIfAbsent(topic, new 
TopicPublishInfo());
-            this.mQClientFactory.updateTopicRouteInfoFromNameServer(topic);
+            try {
+                if(lockUpdatePublishInfo.tryLock(LOCK_TIMEOUT_MILLIS, 
TimeUnit.MILLISECONDS)){

Review Comment:
   It's a good idea, I'll try to optimize it



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