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https://issues.apache.org/jira/browse/KAFKA-14661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17682936#comment-17682936
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Christo Lolov commented on KAFKA-14661:
---------------------------------------
For Zookeeper 3.8.0:
{code:java}
ZooKeeper clients from 3.5.x onwards are fully compatible with 3.8.x servers.
The upgrade from 3.6.x and 3.7.x can be executed as usual, no particular
additional upgrade procedure is needed.
ZooKeeper 3.8.x clients are compatible with 3.5.x, 3.6.x and 3.7.x servers as
long as you are not using new APIs not present these versions.
{code}
For Zookeeper 3.6.0:
{code:java}
ZooKeeper clients from 3.4 and 3.5 branch are fully compatible with 3.6 servers.
The upgrade from 3.5.7 to 3.6.0 can be executed as usual, no particular
additional upgrade procedure is needed.
ZooKeeper 3.6.0 clients are compatible with 3.5 servers as long as you are not
using new APIs not present in 3.5.
{code}
> Upgrade Zookeeper to 3.8.1
> ---------------------------
>
> Key: KAFKA-14661
> URL: https://issues.apache.org/jira/browse/KAFKA-14661
> Project: Kafka
> Issue Type: Improvement
> Components: packaging
> Reporter: Divij Vaidya
> Assignee: Christo Lolov
> Priority: Blocker
> Fix For: 3.5.0, 3.4.1, 3.3.3
>
>
> Current Zk version (3.6.x) supported by Apache Kafka has been EOL since
> December 2022 [1]
> Users of Kafka are facing regulatory hurdles because of using a dependency
> which is EOL, hence, I would suggest to upgrade this in all upcoming releases
> (including patch releases of 3.3.x and 3.4.x versions).
> Some things to consider while upgrading (as pointed by [~ijuma] at [2]):
> # If we upgrade the zk server to 3.8.1, what is the impact on the zk
> clients. That is, what's the earliest zk client version that is supported by
> the 3.8.x server?
> # We need to ensure there are no regressions (particularly on the stability
> front) when it comes to this upgrade. It would be good for someone to stress
> test the system a bit with the new version and check if all works well.
> [1] [https://zookeeper.apache.org/releases.html]
> [2][https://github.com/apache/kafka/pull/12620#issuecomment-1409028650]
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