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https://issues.apache.org/jira/browse/KAFKA-10339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17776850#comment-17776850
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Greg Harris commented on KAFKA-10339:
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[~funkerman] Hello!
In your example, no, because auto-synced offsets is at-least-once. If Consumer
A reads and commits A, B, C, they may be re-read by consumer B. The guarantee
that "MM2 EOS" provides is that consumer B will read mirrored messages at most
once, regardless of what consumer A does.
> MirrorMaker2 Exactly-once Semantics
> -----------------------------------
>
> Key: KAFKA-10339
> URL: https://issues.apache.org/jira/browse/KAFKA-10339
> Project: Kafka
> Issue Type: New Feature
> Components: KafkaConnect, mirrormaker
> Reporter: Ning Zhang
> Assignee: Ning Zhang
> Priority: Major
> Labels: needs-kip
> Fix For: 3.5.0
>
> Attachments: image-2023-10-17-15-33-57-983.png
>
>
> MirrorMaker2 is currently implemented on Kafka Connect Framework, more
> specifically the Source Connector / Task, which do not provide exactly-once
> semantics (EOS) out-of-the-box, as discussed in
> https://github.com/confluentinc/kafka-connect-jdbc/issues/461,
> https://github.com/apache/kafka/pull/5553,
> https://issues.apache.org/jira/browse/KAFKA-6080 and
> https://issues.apache.org/jira/browse/KAFKA-3821. Therefore MirrorMaker2
> currently does not provide EOS.
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