zhaohai1299002788 opened a new pull request #3595:
URL: https://github.com/apache/rocketmq/pull/3595


   There are several inefficient iterations of Map, in such code, keySet() is 
retrieved from Map firstly, and values are got in each iteration by key. In my 
opinion, entrySet() should be used, so that keys and values can be fetched in 
one time.


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