Hi,

I fully support your efforts regarding 3.9.3 release.

Do you think that
https://cwiki.apache.org/confluence/spaces/KAFKA/pages/440303727/KIP-1362+Add+a+rollback-compatible+storage+format+option+for+KRaft+migration

could be something to include in 3.9.3? It seems to be stuck in the KIP
phase, so the pull request is also stuck.

On Sun, Oct 25, 2026 at 3:19 PM Chia-Ping Tsai <[email protected]> wrote:

> Hi all,
>
> There are some critical bugs related to ZK migration, so I’d like to
> open a discussion for the 3.9.3 release.
>
> KAFKA-20960: Block ZK-to-KRaft migration finalization until brokers
> re-register (merged)
>
> https://github.com/apache/kafka/commit/ea11d59ecda2ec57be0f1ef83a554ef5d3b82770
>
> KAFKA-21142: Fix partition creation when handling snapshot delta
> during migration (merged)
>
> https://github.com/apache/kafka/commit/daebfbd9b37c913937d5adfc2e493fe825e3da3a
>
> KAFKA-21062: Handle BADVERSION on /migration writes (under review)
> https://github.com/apache/kafka/pull/23639
>
> My sense is that ZK migration is the only official way to encourage
> users to get into KRaft, so keeping it working is a strong reason to
> do a release.
>
> I haven’t finished reviewing the last one yet, but it would be good to
> make sure the release will happen. Otherwise, my tokens will be
> totally wasted :)
>
> Any thoughts?
>

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