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Snailclimb merged 1 commit into from
Jun 30, 2021
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Update RocketMQ.md #1259

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4 changes: 2 additions & 2 deletions docs/system-design/distributed-system/message-queue/RocketMQ.md
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Expand Up @@ -190,7 +190,7 @@

你可以看到图中生产者组中的生产者会向主题发送消息，而 **主题中存在多个队列**，生产者每次生产消息之后是指定主题中的某个队列发送消息的。

每个主题中都有多个队列(这里还不涉及到 `Broker`)，集群消费模式下，一个消费者集群多台机器共同消费一个 `topic` 的多个队列，**一个队列只会被一个消费者消费**。如果某个消费者挂掉，分组内其它消费者会接替挂掉的消费者继续消费。就像上图中 `Consumer1` 和 `Consumer2` 分别对应着两个队列，而 `Consuer3` 是没有队列对应的，所以一般来讲要控制 **消费者组中的消费者个数和主题中队列个数相同** 。
每个主题中都有多个队列(分布在不同的 `Broker`中，如果是集群的话，`Broker`又分布在不同的服务器中)，集群消费模式下，一个消费者集群多台机器共同消费一个 `topic` 的多个队列，**一个队列只会被一个消费者消费**。如果某个消费者挂掉，分组内其它消费者会接替挂掉的消费者继续消费。就像上图中 `Consumer1` 和 `Consumer2` 分别对应着两个队列，而 `Consuer3` 是没有队列对应的，所以一般来讲要控制 **消费者组中的消费者个数和主题中队列个数相同** 。

当然也可以消费者个数小于队列个数，只不过不太建议。如下图。

Expand Down Expand Up @@ -451,4 +451,4 @@ emmm，是不是有一点复杂🤣，看英文图片和英文文档的时候就

等等。。。

> 如果喜欢可以点赞哟👍👍👍。
> 如果喜欢可以点赞哟👍👍👍。