dugenkui03 commented on issue #4142:
URL: https://github.com/apache/rocketmq/issues/4142#issuecomment-1097828873

   @ni-ze The read-thread maybe get unexpected value, instread of the latest 
value.  Details in [jdk 
document](https://github.com/openjdk/jdk/blob/280aa428800043f314b92ae88076d596cb4c2fe0/src/java.base/share/classes/java/util/HashMap.java#L89).
   
   >Note that this implementation is not synchronized. If multiple threads 
access a hash map concurrently, and at least one of the threads modifies the 
map structurally, it must be synchronized externally.
   


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