GitHub user mxsm added a comment to the discussion: 5.1 版本controller 无法自动切换: 
org.apache.rocketmq.client.exception.MQBrokerException: CODE: 2012  DESC: The 
broker has not master, and this new registered broker can't not be elected as 
master

epochFileCheckpoint 这个目录不能改,如果你改动了需要将之前目录中的数据文件也一并移动过去。 

GitHub link: 
https://github.com/apache/rocketmq/discussions/6685#discussioncomment-5807152

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