ZooKeeper: Releases, patches & end-of-life
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Lifecycle guide for ZooKeeper from Apache

All releases, patches, maintenance and support periods at a glance

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📅 Last update on 2026-04-16

What is ZooKeeper?

Automate product release and end-of-life managementZooKeeper is a centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services. All of these kinds of services are used in some form or another by distributed applications. Each time they are implemented there is a lot of work that goes into fixing the bugs and race conditions that are inevitable. Because of the difficulty of implementing these kinds of services, applications initially usually skimp on them, which make them brittle in the presence of change and difficult to manage. Even when done correctly, different implementations of these services lead to management complexity when the applications are deployed.
 

The entire lifecycle of ZooKeeper

The following figure shows you the visualised product life cycle of ZooKeeper. You can see all releases with the latest patch version, the long-term support characteristics (orange flag in the green circle, the periods for version provision, maintenance and support.
ZooKeeper (Apache) release, version and end-of-life information
XZooKeeper (Apache) release, version and end-of-life information
Figure: Release, patch and end-of-life cycle of product ZooKeeper (Apache)
 

What is the ZooKeeper release strategy?

The Apache ZooKeeper community supports two release branches at a time: stable and current. The stable version of ZooKeeper is 3.7.x and the current version is 3.8.x. Once a new minor version is released, the stable version is expected to be decommissioned soon and in approximately half a year will be announced as End-of-Life. During the half year grace period only security and critical fixes are expected to be released for the version. After EoL is announced no further patches are provided by the community. All ZooKeeper releases will remain accessible from the official Apache Archives.

Facts and figures about ZooKeeper

Product
ZooKeeper
Vendor
Apache
Latest version
3.9.5
Number of releases
7
Number of versions
161
Number of unstable versions
108
Number of versions affected by CVE
88
Licence
Apache License 2.0
Wikipedia
https://en.wikipedia.org/wiki/Apache_ZooKeeper
 
 

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Lukas Böttcher
Lukas Böttcher
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