Matthias J. Sax created KAFKA-19703:
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Summary: 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
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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