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Posted to dev@rocketmq.apache.org by GitBox <gi...@apache.org> on 2022/04/11 09:12:33 UTC

[GitHub] [rocketmq] panzhi33 commented on a diff in pull request #4146: [ISSUE #4145] docs: Add 'at most once' feature in the feature documents.

panzhi33 commented on code in PR #4146:
URL: https://github.com/apache/rocketmq/pull/4146#discussion_r847110899


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docs/cn/features.md:
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@@ -28,14 +28,17 @@ RocketMQ支持消息的高可靠,影响消息可靠性的几种情况:
 5)、6)属于单点故障,且无法恢复,一旦发生,在此单点上的消息全部丢失。RocketMQ在这两种情况下,通过异步复制,可保证99%的消息不丢,但是仍然会有极少量的消息可能丢失。通过同步双写技术可以完全避免单点,同步双写势必会影响性能,适合对消息可靠性要求极高的场合,例如与Money相关的应用。注:RocketMQ从3.0版本开始支持同步双写。
 
 ## 5 至少一次
-至少一次(At least Once)指每个消息必须投递一次。Consumer先Pull消息到本地,消费完成后,才向服务器返回ack,如果没有消费一定不会ack消息,所以RocketMQ可以很好的支持此特性。
+至少一次(At Least Once)指每条消息至少投递一次。Consumer先Pull消息到本地,消费完成后,才向服务器返回ack,如果没有消费一定不会ack消息,所以RocketMQ可以很好的支持此特性。
 
-## 6 回溯消费
+## 6 至多一次
+至多一次(At Most Once)指每条消息至多投递一次。Producer 的 `sendOneway` 方法,将消息投递给目标 `MessageQueue` 后,忽略 Broker 对投递结果的反馈,也不会有任何重试机制。

Review Comment:
   Would it be better to change it to send here?



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