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https://issues.apache.org/jira/browse/KAFKA-7190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16556070#comment-16556070
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Matthias J. Sax commented on KAFKA-7190:
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Good point. You are right, consumers in `read_uncommitted` mode can read the
data. So maybe we don't need to change anything and explain users that they use
the API incorrectly if they delete uncommitted data but want to consume in
`read_committed` mode.
> Under low traffic conditions purging repartition topics cause WARN statements
> about UNKNOWN_PRODUCER_ID
> ---------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-7190
> URL: https://issues.apache.org/jira/browse/KAFKA-7190
> Project: Kafka
> Issue Type: Improvement
> Components: core, streams
> Affects Versions: 1.1.0, 1.1.1
> Reporter: Bill Bejeck
> Assignee: lambdaliu
> Priority: Major
>
> When a streams application has little traffic, then it is possible that
> consumer purging would delete
> even the last message sent by a producer (i.e., all the messages sent by
> this producer have been consumed and committed), and as a result, the broker
> would delete that producer's ID. The next time when this producer tries to
> send, it will get this UNKNOWN_PRODUCER_ID error code, but in this case,
> this error is retriable: the producer would just get a new producer id and
> retries, and then this time it will succeed.
>
> Possible fixes could be on the broker side, i.e., delaying the deletion of
> the produderIDs for a more extended period or on the streams side developing
> a more conservative approach to deleting offsets from repartition topics
>
>
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