Hi, I did the following: - Verified checksums and signatures - Ran the quickstart with the Scala 2.13 artifact on Java 21 in ZooKeeper mode - Ran the quickstart with the 3.9.2-rc0 docker image in KRaft mode - Built from source and ran the unit and integration tests - Checked the javadocs
+1 (binding) Thanks for running the release, Mickael On Thu, Jan 15, 2026 at 5:03 PM Paolo Patierno <[email protected]> wrote: > > Sorry folks, just ignore my last email, it was targeted for Apache Kafka > 4.2.0 not 3.9.2! Sorry again for the noise! > > On Thu, 15 Jan 2026 at 15:58, Paolo Patierno <[email protected]> > wrote: > > > Hello, > > I think I have found a regression. > > When running Kafka Connect and submitting an HTTP GET request to the > > /connector-plugins endpoint, the JSON serialized "type" filed in the body > > response is now uppercase instead of being lowercase as in the past. > > Following a comparison between Apache Kafka 4.1 ... > > > > > > [{"class":"org.apache.kafka.connect.mirror.MirrorCheckpointConnector","type":"source","version":"4.1.1"},{"class":"org.apache.kafka.connect.mirror.MirrorHeartbeatConnector","type":"source","version":"4.1.1"},{"class":"org.apache.kafka.connect.mirror.MirrorSourceConnector","type":"source","version":"4.1.1"}] > > > > ... and the current Apache Kafka 4.2 RC0 > > > > > > [{"class":"org.apache.kafka.connect.mirror.MirrorCheckpointConnector","type":"SOURCE","version":"4.2.0"},{"class":"org.apache.kafka.connect.mirror.MirrorHeartbeatConnector","type":"SOURCE","version":"4.2.0"},{"class":"org.apache.kafka.connect.mirror.MirrorSourceConnector","type":"SOURCE","version":"4.2.0"}] > > > > As you can see it's "source" vs "SOURCE". I had same result with "sink" vs > > "SINK". > > > > I think this is due to the last change from converting the PluginInfo from > > being a class to a record which had an impact together with the JSON > > serialization. > > When it was a class, a dedicated type.toString() was used which explicitly > > does a lower case transformation. > > As a record, the "type" field is directly serialized by JSON by using the > > enum values from PluginType which are all uppercase of course. > > It means that this issue affects all the other values as well the way they > > are serialized (not just SINK, SOURCE but also CONVERTER, TRANSFORMATION, > > and so on). > > > > If you like I could provide a contribution for that. > > > > Thanks, > > Paolo. > > > > On Thu, 15 Jan 2026 at 04:45, PoAn Yang <[email protected]> wrote: > > > >> Hello Kafka users, developers and client-developers, > >> > >> This is the RC0 candidate for release of Apache Kafka 3.9.2. > >> > >> This is a bug-fix & CVE-fix release like CVE-2024-29371, CVE-2025-58057, > >> and CVE-2025-48734. In this version, we have a KIP-1252 to align > >> AlterConfigPolicy behavior between ZK and Kraft. > >> > >> Release notes for the 3.9.2 release: > >> https://dist.apache.org/repos/dist/dev/kafka/3.9.2-rc0/RELEASE_NOTES.html > >> > >> Please download, test and vote by *Wednesday, January 21, 9:00 PM 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/3.9.2-rc0/ > >> > >> * Docker release artifacts to be voted upon: > >> apache/kafka:3.9.2-rc0 > >> apache/kafka-native:3.9.2-rc0 > >> > >> * 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/3.9.2-rc0/javadoc/ > >> > >> * Tag to be voted upon (off 3.9 branch) is the 3.9.2 tag: > >> https://github.com/apache/kafka/releases/tag/3.9.2-rc0 > >> > >> * Documentation: > >> https://kafka.apache.org/39/documentation.html > >> > >> * Protocol: > >> https://kafka.apache.org/39/protocol.html > >> > >> * Successful 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/3.9/258/ > >> System tests: https://jenkins.opensource4you.tw/job/kafka-e2e/629/ > >> For failed tests, they can pass in another run, so the result is green: > >> https://drive.google.com/drive/folders/1GXoTYEUu8PjuJYoVvUbAm9LCJotDRfJ-?usp=sharing > >> > >> * Successful Docker Image Github Actions Pipeline for 3.9 branch: > >> Docker Build Test Pipeline (JVM): > >> https://github.com/apache/kafka/actions/runs/20997657980 > >> Docker Build Test Pipeline (Native): > >> https://github.com/apache/kafka/actions/runs/20997669079 > >> > >> Thanks, > >> PoAn > > > > > > > > -- > > Paolo Patierno > > > > *Senior Principal Software Engineer @ IBM**CNCF Ambassador* > > > > Twitter : @ppatierno <http://twitter.com/ppatierno> > > Linkedin : paolopatierno <http://it.linkedin.com/in/paolopatierno> > > GitHub : ppatierno <https://github.com/ppatierno> > > > > > -- > Paolo Patierno > > *Senior Principal Software Engineer @ IBM**CNCF Ambassador* > > Twitter : @ppatierno <http://twitter.com/ppatierno> > Linkedin : paolopatierno <http://it.linkedin.com/in/paolopatierno> > GitHub : ppatierno <https://github.com/ppatierno>
