[GitHub] wqliang opened a new issue #670: ConcurrentModificationException occurred when querying producer connection list

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wqliang opened a new issue #670: ConcurrentModificationException occurred when querying producer connection list
URL: https://github.com/apache/rocketmq/issues/670
 
 
   I got a ConcurrentModificationException when querying producer connection list by tools. 
   ProducerManage.getGroupChannelTable() clones a new copy of groupChannelTable, in which the key is group name and the value is a HashMap. (see link 1) The values in the result HashMap are still the same reference of HashMap in "groupChannelTable". While retrieving the result HashMap, there may be a ConcurrentModificationException when the original groupChannelTable changes at the same time. (see link 2)
   
   
   link 1: https://github.com/apache/rocketmq/blob/795eae6f44587eaaf770571160a604a953fa8716/broker/src/main/java/org/apache/rocketmq/broker/client/ProducerManager.java#L56
   
   link 2:
   https://github.com/apache/rocketmq/blob/795eae6f44587eaaf770571160a604a953fa8716/broker/src/main/java/org/apache/rocketmq/broker/processor/AdminBrokerProcessor.java#L631
   
   **BUG REPORT**
   
   1. Please describe the issue you observed:
   
   - What did you do (The steps to reproduce)?
   query the producer connection list by tools while there is producer-client disconnecting or new producer connecting.
   
   - What did you see instead?
   ConcurrentModificationException occurred
   
   2. Please tell us about your environment:
   rocketmq-4.3.0

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