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https://issues.apache.org/jira/browse/KAFKA-19012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18023209#comment-18023209
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Jun Rao commented on KAFKA-19012:
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[~dnadolny] : Have you gotten a chance to try the patch yet? Thanks.
> Messages ending up on the wrong topic
> -------------------------------------
>
> Key: KAFKA-19012
> URL: https://issues.apache.org/jira/browse/KAFKA-19012
> Project: Kafka
> Issue Type: Bug
> Components: clients, producer
> Affects Versions: 3.2.3, 3.8.1
> Reporter: Donny Nadolny
> Assignee: Kirk True
> Priority: Blocker
> Attachments: image-2025-08-06-13-34-30-830.png
>
>
> We're experiencing messages very occasionally ending up on a different topic
> than what they were published to. That is, we publish a message to topicA and
> consumers of topicB see it and fail to parse it because the message contents
> are meant for topicA. This has happened for various topics.
> We've begun adding a header with the intended topic (which we get just by
> reading the topic from the record that we're about to pass to the OSS client)
> right before we call producer.send, this header shows the correct topic
> (which also matches up with the message contents itself). Similarly we're
> able to use this header and compare it to the actual topic to prevent
> consuming these misrouted messages, but this is still concerning.
> Some details:
> - This happens rarely: it happened approximately once per 10 trillion
> messages for a few months, though there was a period of a week or so where it
> happened more frequently (once per 1 trillion messages or so)
> - It often happens in a small burst, eg 2 or 3 messages very close in time
> (but from different hosts) will be misrouted
> - It often but not always coincides with some sort of event in the cluster
> (a broker restarting or being replaced, network issues causing errors, etc).
> Also these cluster events happen quite often with no misrouted messages
> - We run many clusters, it has happened for several of them
> - There is no pattern between intended and actual topic, other than the
> intended topic tends to be higher volume ones (but I'd attribute that to
> there being more messages published -> more occurrences affecting it rather
> than it being more likely per-message)
> - It only occurs with clients that are using a non-zero linger
> - Once it happened with two sequential messages, both were intended for
> topicA but both ended up on topicB, published by the same host (presumably
> within the same linger batch)
> - Most of our clients are 3.2.3 and it has only affected those, most of our
> brokers are 3.2.3 but it has also happened with a cluster that's running
> 3.8.1 (but I suspect a client rather than broker problem because of it never
> happening with clients that use 0 linger)
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