ifplusor commented on issue #2732:
URL: https://github.com/apache/rocketmq/issues/2732#issuecomment-800076582


   When a new consumer sends a heartbeat to a broker, the broker will notify 
all consumers of the related group to do rebalance. If there are multiple 
brokers, a consumer will receive multiple notifications.
   
   In the rebalance process, the consumer selects a broker randomly to look up 
the consumer list. If the consumer did not send any heartbeat to the broker at 
the time, the returned list is incorrect.


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