fantow opened a new issue #2369:
URL: https://github.com/apache/rocketmq/issues/2369


   **BUG REPORT**
   
   1. Please describe the issue you observed:
   **I think this is a non-thread-safe operationg.Because the collection is 
shared by multiThread,In this case,we use read-lock to make sure we get a 
thread-safe object reference,but we do not supply thread-safe for send 
operating.**
   
   
![RocketMQ_1](https://user-images.githubusercontent.com/18530950/96678999-67fb8300-13a5-11eb-8b7f-95cd820c1267.png)
   
   
   
   
   **If this is a issue,may I submit a PR to fix it?**


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