Hi Chia-Ping, Thanks for mentioning this. Since this commit was in the previous release and not a regression, I'm not sure that it meets the bar for a blocker. But I don't have a strong opinion, so I'll leave it to Christo to decide.
Regards, Bill On Thu, Jan 29, 2026 at 7:57 AM Chia-Ping Tsai <[email protected]> wrote: > hi Christo > > I have spotted a potential blocker, and a patch will be ready soon > > https://github.com/apache/kafka/pull/17942#discussion_r2737868443 > > Best, > Chia-Ping > > On 2026/01/27 15:50:25 Christo Lolov wrote: > > Hello Kafka users, developers and client-developers, > > > > This is the RC2 candidate for release of Apache Kafka 4.2.0. > > > > This release has many exciting changes: > > * Kafka Queues (Share Groups) is now production-ready with new > > features like the RENEW acknowledgement type for extended processing > > times, adaptive batching for coordinators, and comprehensive lag > > metrics. > > * Kafka Streams brings the server-side rebalance protocol to GA with a > > limited feature set, adds dead letter queue support in exception > > handlers, introduces anchored wall-clock punctuation for deterministic > > scheduling, and gives users full control over whether to send a leave > > group request on closing. > > * This release also delivers significant improvements to consistency > > and observability: CLI tools now feature standardized arguments like > > --bootstrap-server across all tools, metric naming has been corrected > > to follow the kafka.COMPONENT convention, and new idle ratio metrics > > provide better visibility into controller and MetadataLoader > > performance. > > * Security is enhanced with a new allowlist connector client > > configuration override policy, while thread-safety improvements to > > RecordHeader eliminate concurrency risks. > > * Additional highlights include external schema support in > > JsonConverter for reduced message sizes, dynamic configuration for > > remote log manager thread pools, and rack ID exposure in the Admin API > > for consumer and share group members. > > > > Release notes for the 4.2.0 release: > > > https://dist.apache.org/repos/dist/dev/kafka/4.2.0-rc2/RELEASE_NOTES.html > > > > *** Please download, test and vote by Friday, January 30, 5pm UTC > > > > 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/4.2.0-rc2/ > > > > * Docker release artifacts to be voted upon: > > apache/kafka:4.2.0-rc2 > > apache/kafka-native:4.2.0-rc2 > > > > * 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/4.2.0-rc2/javadoc/index.html > > > > * Tag to be voted upon (off 4.2 branch) is the 4.2.0 tag: > > https://github.com/apache/kafka/releases/tag/4.2.0-rc2 > > > > * Documentation: > > * Protocol: > > https://github.com/apache/kafka-site/pull/785 > > > > * Successful CI builds for the 4.2 branch: > > Unit/integration tests: The ongoing build for the 4.2.0-rc2 tag can be > found > > at > https://github.com/apache/kafka/actions/runs/21398201956/job/61611167690 > > > > System tests: I have started the tests in my environment and will share > test > > results in the next ~24 hours. > > > > * Successful Docker Image Github Actions Pipeline for 4.2 branch: > > Docker Build Test Pipeline (JVM): > > https://github.com/apache/kafka/actions/runs/21402423697 > > Docker Build Test Pipeline (Native): > > https://github.com/apache/kafka/actions/runs/21398799585 > > > > Thanks, > > Christo > > >
