问题描述
producer 发送消息 1、2、3、4
producer sends messages 1, 2, 3, 4
consumer 接收消息 1、2、3、4
consumer receives messages 1, 2, 3, 4
consumer 崩溃/断开连接
producer 发送消息 5, 6, 7
producer sends messages 5, 6, 7
consumer 回来了，应该接收从 5 开始的消息，而不是从 7 开始
consumer comes back up and should receive messages starting from 5 instead of 7
对于这种结果，我必须使用哪个 offset 值以及需要做哪些其他更改/配置
For this kind of result, which offset value I have to use and what are the other changes/configurations need to do
推荐答案
当消费者加入消费者组时，它将获取最后提交的偏移量，因此如果在崩溃之前提交了最新的提交，它将重新从 5、6、7 开始读取偏移量(所以 4).auto.offset.reset 属性的 earliest 和 latest 值在消费者启动时使用，但分配的分区没有提交的偏移量.在这种情况下，您可以选择是要从头(最早)还是在最后一个(最新)之后重新阅读所有消息.
When a consumer joins a consumer group it will fetch the last committed offset so it will restart to read from 5, 6, 7 if before crashing it committed the latest offset (so 4).The earliest and latest values for the auto.offset.reset property is used when a consumer starts but there is no committed offset for the assigned partition. In this case you can chose if you want to re-read all the messages from the beginning (earliest) or just after the last one (latest).
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