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2.1.7 消息的 push 实现--补充 #1258

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Snailclimb merged 1 commit into from
Jun 30, 2021
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2.1.7 消息的 push 实现--补充 #1258

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2 changes: 2 additions & 0 deletions docs/system-design/distributed-system/message-queue/RocketMQ-Questions.md
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Expand Up @@ -172,6 +172,8 @@ class Broker {

1. 注意，RocketMQ 已经说了自己会有低延迟问题，其中就包括这个消息的 push 延迟问题
2. 因为这并不是真正的将消息主动的推送到消费者，而是 Broker 定时任务每5s将消息推送到消费者
3. pull模式需要我们手动调用consumer拉消息，而push模式则只需要我们提供一个listener即可实现对消息的监听，而实际上，RocketMQ的push模式是基于pull模式实现的，它没有实现真正的push。
4. push方式里，consumer把轮询过程封装了，并注册MessageListener监听器，取到消息后，唤醒MessageListener的consumeMessage()来消费，对用户而言，感觉消息是被推送过来的。

### 2.1.8 消息重复发送的避免

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