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Apache ZooKeeper

Server App

Apache ZooKeeper 3.9 is the newest actively maintained release, currently at patch 3.9.5. 2 of 6 tracked cycles remain supported.

Latest version

3.9.5

Mar 5, 2026

Actively maintained cycles

2

of 6 tracked

Total cycles tracked

6

since Nov 23, 2011

Support pattern

How Apache ZooKeeper has behaved across the cycles tracked here, rather than what its policy documents state. Useful for judging how much runway a version is likely to have before you commit to it.

Typical support window

36 mo (~3 years)

median of 4 completed cycles

New cycle roughly every

13 months

median gap between releases

Compared with server app

+21 mo

longer than the server app median

Computed from release and end-of-life dates tracked for Apache ZooKeeper. Medians are used rather than averages so one unusually short or long release does not skew the figure. Cycles with no recorded end-of-life date are excluded from the support window.

Release lifecycle

Actively maintainedSecurity support onlyEnd of life
Today
3.9Latest
3.9.5 · Mar 5, 2026
3.8
3.8.6 · Feb 11, 2026
3.7
EOL Jan 19, 2024
3.6
EOL Dec 30, 2022
3.5
EOL Jun 1, 2022
3.4
EOL Jun 1, 2020
201220132014201520162017201820192020202120222023202420252026

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