GitHub user lizhanhui added a comment to the discussion: 队列和消费组是一对一的关系嘛?

消费组是消费者负载均衡组的意思。消费组订阅(subscribe)一个或者多个主题(topic), 
从而持有若干队列。隶属于同一个消费组的多个消费者根据消费组的属性(attribute: FIFO, standard,transaction 
isolation等)分配持有的队列的消息。分配方式支持多种,比如standard 消息按照负载分配,顺序消息按照message 
group展开后分配,流式消费按照队列绑定和分配。 进一步可以看下网站上核心概念的介绍。

GitHub link: 
https://github.com/apache/rocketmq/discussions/7701#discussioncomment-7948307

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