MatrixHB commented on issue #4451:
URL: https://github.com/apache/rocketmq/issues/4451#issuecomment-1155951974

   When executing `if (isOrder && !this.lock(mq))`, the main purpose is to lock 
the messageQueue in the server-side, `processQueue.setLocked(true);` is 
secondary.
   
![image](https://user-images.githubusercontent.com/23614576/173732924-a8bac67e-b1ee-4805-965e-4a39b8a6e27a.png)
   


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