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https://issues.apache.org/jira/browse/KAFKA-19703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18019745#comment-18019745
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Lan Ding commented on KAFKA-19703:
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Hi [~mjsax], if you're not working on this, may I take it? Thanks.
> Remove unsupported "upgrade from" versions
> ------------------------------------------
>
> Key: KAFKA-19703
> URL: https://issues.apache.org/jira/browse/KAFKA-19703
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Affects Versions: 4.0.0
> Reporter: Matthias J. Sax
> Priority: Minor
> Labels: beginner, newbie
>
> Cf [https://github.com/apache/kafka/pull/20518#discussion_r2338270305]
> With AK 4.0.0 release, we officially cut support for direct upgrades of Kafka
> Streams applications from versions 2.3 and older, and only direct upgrades
> from 2.4 or newer to 4.0+ are supported.
> Thus, we should update `UpgradeFromValues.java` and remove older version, and
> cleanup the backward compatibility code accordingly.
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