redis中stream数据结构用于实现消息队列，当然之前版本也存在有pubsub(发布订阅方式的消息队列)，而这个stream的设计引进类似kafka中的消费组。

引用来自官方：Consumer groups were initially introduced by the popular messaging system called Kafka (TM). Redis reimplements a similar idea in completely different terms, but the goal is the same: to allow a group of clients to cooperate consuming a different portion of the same stream of messages.

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