+1 (non-binding) Verified on macOS arm64, JDK 17:
* GPG signatures and SHA512 checksums for source, binary, and site-docs tarballs * LICENSE/NOTICE present * Built source with ./gradlew jar — BUILD SUCCESSFUL * git tag 4.2.1-rc4 commit matches the shipped jar's kafka-version.properties commitId * KRaft quickstart: format --standalone, broker start, topic/produce/consume * KIP-1071 streams group: ran WordCountDemo with group.protocol=streams; logs show StreamsGroupHeartbeatRequestManager and counts aggregate correctly across rounds. Exercised kafka-streams-groups.sh --list/--describe/--members/--state/--offsets/ --verbose; --reset-offsets correctly rejected while Stable, accepted once Empty * Docker images apache/kafka and apache/kafka-native: both start, produce/consume works against each, commitId matches the tag * Documentation, javadoc, protocol, release-notes, and GitHub tag URLs all reachable * Maven staging artifacts present with Last-Modified matching the rc4 tag date * Did not rerun the full test suite locally; relied on the linked Apache CI run Thanks PoAn for running the release! On Tue, May 12, 2026 at 2:14 PM PoAn Yang <[email protected]> wrote: > > Hello Kafka users, developers and client-developers, > > This is the second candidate for release of Apache Kafka 4.2.1. > > This is the first bug fix release for Apache Kafka 4.2 with fixes as > described in the release notes. In the second candidate, it adds KAFKA-19851 > and KAFKA-20380. > > Release notes for the 4.2.1 release: > https://dist.apache.org/repos/dist/dev/kafka/4.2.1-rc4/RELEASE_NOTES.html > > Please download, test and vote by Tuesday, May 19, 9pm 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/4.2.1-rc4/ > > * Docker release artifacts to be voted upon: > apache/kafka:4.2.1-rc4 > apache/kafka-native:4.2.1-rc4 > > * 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/4.2.1-rc4/javadoc/index.html > > * Tag to be voted upon (off 4.2 branch) is the 4.2.1 tag: > https://github.com/apache/kafka/releases/tag/4.2.1-rc4 > > * Documentation: > https://kafka.apache.org/42/documentation.html > > * Protocol: > https://kafka.apache.org/42/design/protocol/ > > * Successful CI builds for the 4.2 branch: > Unit/integration tests: > https://github.com/apache/kafka/actions/runs/25717277218 > System tests: https://jenkins.opensource4you.tw/job/kafka-e2e/746/, > https://jenkins.opensource4you.tw/job/kafka-e2e/747/, > https://jenkins.opensource4you.tw/job/kafka-e2e/748/ > > * Successful Docker Image Github Actions Pipeline for 4.2 branch: > Docker Build Test Pipeline (JVM): > https://github.com/apache/kafka/actions/runs/25728469988 > Docker Build Test Pipeline (Native): > https://github.com/apache/kafka/actions/runs/25728486740 > > Thanks, > PoAn > > -- > You received this message because you are subscribed to the Google Groups > "kafka-clients" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion visit > https://groups.google.com/d/msgid/kafka-clients/CAL6fUMRTp3Y7%2BEsbZftMQJQvotbSXop-DohkxN4h_di%2B7tSAQQ%40mail.gmail.com.
