Hello,
I hate to be the messenger (again), but we just found another critical
bug in Kafka Streams: https://issues.apache.org/jira/browse/KAFKA-19668
This one is a little bit more tricky, as it is technically not a
regression, ie, the issue exists since AK 3.3.0 release. However, with
AK 4.0.0 the problem become more real. Background:
In AK 3.3.0 we added `processValues()` function (which has a bug we want
to fix now). The idea was, that `processValues()` would replace
`transformValues()` and we deprecated `transformValues()` in the same
release (AK 3.3).
However, we don't know how many people actually migrated from
`transfromValues()` to `processValues()` in 3.x releases. With 4.0.0
however, we did finally remove `transformValues()`, and thus users of
`transformValues()` are now forced to make the migration.
Hence, we see it as critical issue for 4.x releases, and would like to
get a bug-fix included into 4.0.1.
I am currently working on a PR (will open it later today, it's
technically a one-liner fix), but wanted to get this message out asap,
to assess how we think about this problem, and if we should get a new
RC? Getting a new RC might be simplest (even if the bug is not a
regression), instead of doing a 4.0.2 bug-fix release as follow up.
Thoughts?
Thanks a lot,
-Matthias
On 9/3/25 8:14 AM, Christo Lolov wrote:
Hello!
Thank you everyone for carrying out checks and pointing out misses on my
side!
I have opened 2 PRs against the asf-site repository:
One contains the Javadocs as per RC1 -
https://github.com/apache/kafka-site/pull/718
The other contains the site-docs as per RC1 -
https://github.com/apache/kafka-site/pull/719
I noticed that on the site-docs there is a big diff generated for the
protocol_messages.html, but on a spot-check these changes are part of Kafka
since the 4.0.0 release. Happy to correct any deficiencies on my side if I
am overlooking something obvious.
Thanks once again for all the help!
Best,
Christo
On Wed, 3 Sept 2025 at 15:19, Hong-Yi Chen <apala...@gmail.com> wrote:
Hi Christo,
I verified 4.0.1-rc1 as follows:
- Built and ran all unit and integration tests from the source tarball
(OpenJDK 23 Zulu)
- Verified basic produce and consume functionality
- Verified signatures and checksums of the downloaded artifacts
+1 (non-binding)
Thanks for the release!
Hong-Yi Chen
Christo Lolov <christolo...@gmail.com> 於 2025年8月19日 週二 下午11:43寫道：
Hello Kafka users, developers and client-developers,
This is the second candidate for release of Apache Kafka 4.0.1.
Since this is a patch version it contains the bug fixes outlined in the
release notes below!
Release notes for the 4.0.1 release:
https://dist.apache.org/repos/dist/dev/kafka/4.0.1-rc1/RELEASE_NOTES.html
*** Please download, test and vote by Tuesday August 26.
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/4.0.1-rc1/
* Docker release artifacts to be voted upon:
apache/kafka:4.0.1-rc1
apache/kafka-native:4.0.1-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/4.0.1-rc1/javadoc/
* Tag to be voted upon (off 4.0 branch) is the 4.0.1 tag:
https://github.com/apache/kafka/releases/tag/4.0.1-rc1
* Successful CI builds for the 4.0 branch:
Unit/integration tests:
https://github.com/apache/kafka/actions/runs/17041863563
* Successful Docker Image Github Actions Pipeline for 4.0 branch:
Docker Build Test Pipeline (JVM):
https://github.com/apache/kafka/actions/runs/17068524479
Docker Build Test Pipeline (Native):
https://github.com/apache/kafka/actions/runs/17068533707
Thanks,
Christo
