btlqql opened a new pull request, #10920:
URL: https://github.com/apache/rocketmq/pull/10920

   ## What is the purpose of the change
   
   Fix #10873.
   
   BrokerData.selectBrokerAddr assumed brokerAddrs is non-null and non-empty. A 
default BrokerData instance threw NullPointerException, while an empty map 
reached Random.nextInt(0) and threw IllegalArgumentException.
   
   ## Brief changelog
   
   - BrokerData.selectBrokerAddr: return null for a null or empty address table
   
   ## How was this patch verified
   
   - Code review of the master/slave selection path
   - `git diff --check` clean
   


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