Hi,

Here are the system tests results:
https://drive.google.com/file/d/1wXSuwBKNWrmq1BQzfoC7B2Qelj91P2ih/view?usp=sharing

Like in RC0, these following test is consistently failing in my environment:
kafkatest.tests.core.network_degrade_test.test_rate_device_name=eth0_latency_ms=50_metadata_quorum=COMBINED_KRAFT_rate_limit_kbit=1000000_task_name=rate-1000-latency-50
I opened https://issues.apache.org/jira/browse/KAFKA-19549. Can
someone else try to run that test in their environment?

All the Streams upgrade system tests to 4.1.0 also failed with the
following error: "Could not detect Kafka Streams version
4.1.0-SNAPSHOT.".
This is probably due to the fact that the release script now merges
the release tag (4.1.0-rc1) into the release branch (4.1), so the
branch has 4.1.0 as its version.
It would be good is Streams people could take a look.

Thanks,
Mickael



On Tue, Jul 22, 2025 at 5:44 PM Kuan-Po Tseng <brandb...@gmail.com> wrote:
>
> Hi folks,
>
> I tested upgrading Kafka from both 3.7.2 and 3.8.1 to 4.1.0 and everything
> seems good:
> - Three-node KRaft cluster; verified produce/consume records worked
> correctly using `kafka-producer-perf-test.sh` and
> `kafka-console-consumer.sh` before and after each server upgrade.
> - After upgrading one node to 4.1.0, saw repeated `The node does not
> support UPDATE_RAFT_VOTER` logs — expected since server with older versions
> don't support this API.
> - Once all nodes were upgraded, the message disappeared. Everything worked
> as expected.
>
> +1 (non-binding)
>
> Best,
> Kuan-Po Tseng
>
> On Tue, Jul 22, 2025 at 11:03 PM Chia-Ping Tsai <chia7...@gmail.com> wrote:
>
> > hi
> > If anyone wants to test 4.1.0-RC1 without the backport fix, please simply
> > configure the jdk_version to use another image. For example:
> >
> > jdk_version="openjdk:17-bullseye" /bin/bash tests/docker/run_tests.sh
> >
> > Best,
> > Chia-Ping
> >
> > Josep Prat <josep.p...@aiven.io.invalid> 於 2025年7月22日 週二 下午10:56寫道:
> >
> > > Hi Mickael,
> > > I don't think we need a new RC just because of these files. Technically
> > > speaking these files are part of the source tarball (which we release),
> > but
> > > as they are test files, I wouldn't consider them as a blocker that would
> > > grant a new RC.
> > >
> > > Best,
> > >
> > > On Tue, Jul 22, 2025 at 4:51 PM Mickael Maison <mickael.mai...@gmail.com
> > >
> > > wrote:
> > >
> > > > Hi,
> > > >
> > > > Quick update regarding the system tests. My environment is back but
> > > > now we're hitting https://issues.apache.org/jira/browse/KAFKA-19501.
> > > >
> > > > Debian buster which is used in the system tests is out of support and
> > > > it's apt repository has now been archived. It worked till last week
> > > > but now it's gone so we get an error when building the Docker image.
> > > > We had only updated trunk to use bullseye. I've just backported the
> > > > fix to 4.1:
> > > >
> > >
> > https://github.com/apache/kafka/commit/d5a3acda897890379edb8819f15b144fcea564b0
> > > >
> > > > The fix is only in tests/docker/Dockerfile and tests/docker/ducker-ak.
> > > > My understanding is that these files are not part of any of the
> > > > release artifacts.
> > > > So I'm considering keeping the RC1 artifacts and running the system
> > > > tests with the fix.
> > > >
> > > > Let me know if my understand is incorrect, or if you'd prefer building
> > > > a new RC regardless. Obviously if we find issues with RC1, we'll do
> > > > another RC anyway.
> > > >
> > > > Thanks,
> > > > Mickael
> > > >
> > > >
> > > >
> > > > On Mon, Jul 21, 2025 at 5:04 PM Mickael Maison <
> > mickael.mai...@gmail.com
> > > >
> > > > wrote:
> > > > >
> > > > > Hello Kafka users, developers and client-developers,
> > > > >
> > > > > This is the second candidate for release of Apache Kafka 4.1.0.
> > > > >
> > > > > The release brings many new features and improvements:
> > > > > - Mechanism for plugin to register metrics
> > > > > - Allow running multiple versions of connector plugins
> > > > > - Queue are now in preview access
> > > > > - New Streams rebalance protocol in early access
> > > > > - Support for OAuth jwt-bearer grant type
> > > > > - Improved metadata replication
> > > > >
> > > > > Release notes for the 4.1.0 release:
> > > > >
> > > >
> > >
> > https://dist.apache.org/repos/dist/dev/kafka/4.1.0-rc1/RELEASE_NOTES.html
> > > > >
> > > > > *** Please download, test and vote by Friday July 25.
> > > > >
> > > > > 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/4.1.0-rc1/
> > > > >
> > > > > * Docker release artifacts to be voted upon:
> > > > > apache/kafka:4.1.0-rc1
> > > > > apache/kafka-native:4.1.0-rc1
> > > > >
> > > > > * 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/4.1.0-rc1/javadoc/
> > > > >
> > > > > * Tag to be voted upon (off 4.1 branch) is the 4.1.0 tag:
> > > > > https://github.com/apache/kafka/releases/tag/4.1.0-rc1
> > > > >
> > > > > * Documentation:
> > > > > https://kafka.apache.org/41/documentation.html
> > > > > PR (https://github.com/apache/kafka-site/pull/702) is not merged yet
> > > > >
> > > > > * Protocol:
> > > > > https://kafka.apache.org/41/protocol.html
> > > > > PR (https://github.com/apache/kafka-site/pull/702) is not merged yet
> > > > >
> > > > > * Successful CI builds for the 4.1 branch:
> > > > > Unit/integration tests:
> > > > https://github.com/apache/kafka/actions/runs/16415760777
> > > > > System tests: The environment I use for running the system tests is
> > > > > under maintenance. If someone can run the system tests, go ahead.
> > > > > Otherwise I'll send an update once I'm able to run them.
> > > > >
> > > > > * Successful Docker Image Github Actions Pipeline for 4.1 branch:
> > > > > Docker Build Test Pipeline (JVM):
> > > > > https://github.com/apache/kafka/actions/runs/16415783067
> > > > > Docker Build Test Pipeline (Native):
> > > > > https://github.com/apache/kafka/actions/runs/16415786103
> > > > >
> > > > > Thanks,
> > > > > Mickael
> > > >
> > >
> > >
> > > --
> > > [image: Aiven] <https://www.aiven.io>
> > >
> > > *Josep Prat*
> > > Sr. Engineering Director, Streaming Services, *Aiven*
> > > josep.p...@aiven.io   |   +491715557497
> > > aiven.io <https://www.aiven.io>   |   <
> > https://www.facebook.com/aivencloud
> > > >
> > >   <https://www.linkedin.com/company/aiven/>   <
> > > https://twitter.com/aiven_io>
> > > *Aiven Deutschland GmbH*
> > > Alexanderufer 3-7, 10117 Berlin
> > >
> > > Geschäftsführer: Oskari Saarenmaa, Hannu Valtonen,
> > >
> > >  Kenneth Chen
> > > Amtsgericht Charlottenburg, HRB 209739 B
> > >
> >

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