Hello! You can find the reports from the system tests in https://drive.google.com/drive/folders/1mFO6S1EvwMeTrM8w-ePTiRj6ko97Sv3A?usp=sharing
The tests were ran in parallel on 4 EC2 m5.4xlarge machines with Ubuntu 24.04 and Java 17. The tests which failed in the first runs were reran in the second runs i.e. client_2.txt contains a successful run of the failing tests in client_1.txt. Let me know if I have missed something! Best, Christo On Tue, 20 Jan 2026 at 15:04, Christo Lolov <[email protected]> wrote: > > Heya Mickael, > > You are correct! I have since dropped RC0 and closed RC1 and the links > should be pointing to artifacts from yesterday. > > Best, > Christo > > On Tue, 20 Jan 2026 at 14:23, Rich Bowen <[email protected]> wrote: > > > > > > > > On 2026/01/19 16:27:23 Christo Lolov wrote: > > > Hello Kafka users, developers and client-developers, > > > > > > This is the RC1 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-rc1/RELEASE_NOTES.html > > > > > > *** Please download, test and vote by Monday, January 26, 10am 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-rc1/ > > > > > > > +1 (non-binding) > > > > * Verified signatures and hashes on the following files as per > > https://apache.org/info/verification.html > > - kafka-4.2.0-src.tgz (SHA1, SHA512, GPG signature) > > - kafka_2.13-4.2.0-site-docs.tgz (SHA1, SHA512, GPG signature) > > - kafka_2.13-4.2.0.tgz (SHA512, SHA1, GPG signature) > > * Verified LICENSE and NOTICE files > >
