GitHub user RongtongJin closed the discussion with a comment: 
大佬们请问生产者组(producerGroup)是干嘛的?

主要是用于事务消息回查的。事务消息的回查机制,回查时 Broker 
端若发现原始生产者连接已经断开,则会联系同一生产者组(producerGroup)的其他生产者实例以 Commit 或 Rollback 半事务消息。

GitHub link: 
https://github.com/apache/rocketmq/discussions/7387#discussioncomment-7093315

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