> However, I do not know if 2.0 has the same properties. During the discussion about https://github.com/apache/kafka/pull/18193, I suggested that Kafka version 2.0 could also be a viable baseline option. This would help us align the upgrade path and protocol matrix.
However, I am uncertain whether Kafka version 2.0 supports the same set of protocols. Furthermore, considering the imminent release of version 4.0, altering the baseline at this stage could introduce unnecessary risks. Therefore, in PR #18193, I opted to include thorough documentation that emphasizes that Kafka version 2.0 can be used as a bridge for client upgrades, but it is not officially supported for broker version 4.0. Best, Chia-Ping On 2025/01/09 08:18:13 Bruno Cadonna wrote: > Hi Jiunn-Yang, > > I believe KIP-894 contains the answer to your question. There it says: > > "Apache Kafka 2.1 has been chosen as the baseline because it was > released many years ago and it includes support for KIP-320 (required > for proper fencing support when consuming) and KIP-110 (zstd is a > popular compression mechanism)." > > https://cwiki.apache.org/confluence/display/KAFKA/KIP-896%3A+Remove+old+client+protocol+API+versions+in+Kafka+4.0 > > However, I do not know if 2.0 has the same properties. > > Best, > Bruno > > On 07.01.25 17:01, 黃竣陽 wrote: > > Hello forks, > > > > Kafka 4.0 is a major release that introduces significant changes. We have > > deprecated outdated APIs and > > established a new baseline version of 2.1 as defined in KIP-896. While > > there has been extensive discussion > > in related PRs regarding broker-client compatibility, the client upgrade > > and migration paths have not been explicitly defined. > > For the client module, the current tentative baseline is version 2.0, which > > was already discussed in PR[1]. A new KIP will be > > introduced to further clarify this. > > However, what I’m particularly curious about is why KIP-896 set the > > baseline version to 2.1 instead of 2.0. > > I would appreciate any insights on this. > > > > [1]Discussion PR > > <https://github.com/apache/kafka/pull/18193#issuecomment-2572283545> > > > > Best regards, > > Jiunn-Yang > >
