[GitHub] davidpdw opened a new issue #566: Auto create topic question

[GitBox <gi...@apache.org>]

davidpdw opened a new issue #566: Auto create topic question
URL: https://github.com/apache/rocketmq/issues/566
 
 
   **BUG REPORT**
   
   1. Please describe the issue you observed:
   
   - What did you do (The steps to reproduce)?
   
   broker端开启了自动创建Topic，生产端默认配置，首先发送一条消息，超过30s后在发送消息，只会在一个master节点上面创建topic，不会再所有master节点上面创建topic
   
   
   - What did you expect to see?
   
   所有master节点都会自动创建topic
   
   - What did you see instead?
   
   只有一个master节点有topic
   
   2. Please tell us about your environment:
   
   broker 4.3.0
   client 4.3.0
   3 namesrv  2 master 2 slave
   
   
   3. Other information (e.g. detailed explanation, logs, related issues, suggestions how to fix, etc):
   
       分析自动创建topic源码发现，client第一次发送会根据AUTO_CREATE_TOPIC_KEY从namesrv拿到topicRouteInfo作为新创建topic的topicRouteInfo，而MQClientInstance里面每30s会拉取topic的topicRouteInfo最新信息并更新。
       异常情况1：Producer发送一条信息后关闭掉Producer，这个时候只有在一个broker上面有topic信息，下一次启动Producer发送消息的时候就会直接从NameSrv拿到最新的topicRouteInfo，这样就只能在一个master节点上面创建topic
       异常情况2：Producer发送一条信息后，这个时候只有在一个broker上面有topic信息，隔35s在发送一条信息，在这段时间内，已经完成MQClientInstance对Topic Route的更新，topicRouteInfo只会拉取到一个master节点，这样也只能在一个master节点上面创建topic
   

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