Hi TengYao, I did some testing on the upgrade path: - Set up a ZK-based Kafka cluster on 3.5, created some topics, and produced a bunch of messages - Upgraded to 3.9.1-RC1 - Migrated to KRaft
And everything worked smoothly! Thanks a lot for all your hard work! Best, Kuan-Po Tseng On 2025/04/23 09:00:00 TengYao Chi wrote: > Hello Kafka users, developers, and client-developers, > > This is the second candidate for the release of Apache Kafka 3.9.1. > This RC fixed the release tag off to a temporary branch issue (KAFKA-19166 > <https://issues.apache.org/jira/browse/KAFKA-19166>) compared with RC0. > > This is a bug-fix release with several fixes, and most importantly, it adds > Java 23 support for 3.9 > > Release notes for the 3.9.1 release: > https://dist.apache.org/repos/dist/dev/kafka/3.9.1-rc1/RELEASE_NOTES.html > > Please download, test, and vote by *Wednesday, April 30, 9:00 AM PT* > > Kafka's KEYS file containing PGP keys we use to sign the release: > https://kafka.apache.org/KEYS > > * Release artifacts to be voted upon (source and binary): > https://dist.apache.org/repos/dist/dev/kafka/3.9.1-rc1/ > > * Docker release artifacts to be voted upon: > apache/kafka:3.9.1-rc1 > https://hub.docker.com/layers/apache/kafka/3.9.1-rc1/images/sha256-459c4e12260a1426a4f53c357d6e0c52b58ed70ff4118de1ffceb3f131d64a2a > > apache/kafka-native:3.9.1-rc1 > https://hub.docker.com/layers/apache/kafka-native/3.9.1-rc1/images/sha256-be97bd4564444cae8a9880a4eaa1a594df2d2e5ea0b8990228751cdef278faca > > * Maven artifacts to be voted upon: > https://repository.apache.org/content/groups/staging/org/apache/kafka/ > > * Javadoc: > https://dist.apache.org/repos/dist/dev/kafka/3.9.1-rc1/javadoc/ > > * Tag to be voted upon (off 3.9 branch) is the 3.9.1 tag: > https://github.com/apache/kafka/releases/tag/3.9.1-rc1 > > * Documentation: > https://kafka.apache.org/39/documentation.html > > * Protocol: > https://kafka.apache.org/39/protocol.html > > * CI builds for the 3.9 branch: > Unit/integration tests (There are some flaky tests): > https://ci-builds.apache.org/job/Kafka/job/kafka/job/3.9/194/ > > System tests: > http://jenkins.opensource4you.tw/job/kafka-e2e/304/ > > * Successful Docker Image Github Actions Pipeline for 3.9 branch: > Docker Build Test Pipeline (JVM): > https://github.com/apache/kafka/actions/runs/14597360082 > Docker Build Test Pipeline (Native): > https://github.com/apache/kafka/actions/runs/14597364430 > > > Thanks, > TengYao Chi >
