KafkaConsumer.commitAsync() 行为的偏移量比以前的低 [英] KafkaConsumer.commitAsync() behavior with a lower offset than previous

问题描述

kafka 将如何处理调用

How will kafka deal with a call to

KafkaConsumer.commitAsync(Map offsets, OffsetCommitCallback callback)

当某个主题的偏移值被指定为小于先前调用的值时?

when offset value for a topic is given as a lesser value than a previous invocation?

推荐答案

它会简单地将分区的偏移量设置为您指定的值，因此下次您将使用来自 commitedOffset+1 的消息.
commitAsync() 的 javadoc 说:

It will simply set the offset of the partition to the value you specified,so next time you will consume you message from commitedOffset+1.
The javadoc of commitAsync() says:

提交的偏移量应该是您的应用程序将使用的下一条消息，即lastProcessedMessageOffset + 1.

The committed offset should be the next message your application will consume,i.e. lastProcessedMessageOffset + 1.

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