[GitHub] [rocketmq] shuangchengsun commented on issue #3953: Change Retry-Queue Num Will Cause Retry-Message Loss

[GitBox]

shuangchengsun commented on issue #3953:
URL: https://github.com/apache/rocketmq/issues/3953#issuecomment-1064719127


   > 
   
   this command dose change the queue number in 「TopicConfig」data structure. 
however, the queue number in 「SubscriptionGroupConfig」is still the old number, 
the 「SubscriptionGroupConfig」is the key to deciding which queue to deliver the 
message to. In my view, The key is to ensure the consistency of these two data 
structures.
   The code in 
org.apache.rocketmq.broker.processor.SendMessageProcessor#asyncConsumerSendMsgBack
   <img width="952" alt="image" 
src="https://user-images.githubusercontent.com/33629004/157792268-468cafa0-3f9f-4edc-a29d-641e2a1edf2d.png";>
   <img width="1146" alt="image" 
src="https://user-images.githubusercontent.com/33629004/157792316-63305cd7-48d3-4e85-8718-b3c191e65964.png";>
   


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