Status

Current state: "Accepted"

Discussion thread: here

Voting thread:here

JIRA: here

PR: here

Motivation

Kafka has a dependency on Zookeeper 3.6.3, which reached its end of life in December 2022. We would like to upgrade Zookeeper to version 3.8.1 which is the latest release of the 3.8.x versions.

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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.

Public Interfaces

No public interfaces are being changed.

Proposed Changes

Similarly to https://github.com/apache/kafka/pull/12620/files we would like to upgrade to 3.8.1.

Compatibility, Deprecation, and Migration Plan

• What impact (if any) will there be on existing users?

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• If we are changing behavior how will we phase out the older behavior? It should gradually be phased out as users update their Kafka versions
• If we need special migration tools, describe them here. N/A
• When will we remove the existing behavior? N/A

Test Plan

We ran the following test on the latest trunk of Kafka with Zookeeper 3.6.3 and Zookeeper 3.8.1:

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https://g-576b9cd7b5.grafana-workspace.us-east-1.amazonaws.com/dashboard/snapshot/Vgqt3I8OuPm9upqNvpvMBTs5TrtFY2k5?orgId=1

Rejected Alternatives

If there are alternative ways of accomplishing the same thing, what were they? The purpose of this section is to motivate why the design is the way it is and not some other way. N/A