Apache ZooKeeper™ Releases

The Apache ZooKeeper system for distributed coordination is a high-performance service for building distributed applications.

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Releases may be downloaded from Apache mirrors: Download

On the mirror, all recent releases are available, but are not guaranteed to be stable. For stable releases, look in the stable directory.

You can verify the integrity of a downloaded release using the PGP signatures and hashes (MD5 or SHA1) hosted at the main Apache distro site. For additional information, refer to the Apache documentation for verifying the integrity of Apache project releases.

Release Notes

Release notes for Apache Zookeeper releases are available in Jira: Browse release notes

News

9 November, 2017: release 3.4.11 available

This release fixes 53 issues, it includes support for Java 9 and other critical bug fixes. See ZooKeeper 3.4.11 Release Notes for details.

17 April, 2017: release 3.5.3-beta available

3.5.3-beta is the first beta in the planned 3.5 release line leading up to a stable 3.5 release. It comprises 76 bug fixes and improvements. This release includes important security fix around dynamic reconfigure API, improvements on test infrastructure, and new features such as TTL node.

30 March, 2017: release 3.4.10 available

This release fixes 43 issues, including security feature QuorumPeer mutual authentication via SASL and other critical bugs. See ZooKeeper 3.4.10 Release Notes for details.

03 September, 2016: release 3.4.9 available

This release fixes many critical bugs and improvements. See ZooKeeper 3.4.9 Release Notes for details.

20 July, 2016: release 3.5.2-alpha available

This is an alpha quality release that contains many bug fixes and improvements.

20 February, 2016: release 3.4.8 available

This release fixes 9 issues, most notably a deadlock when shutting down ZooKeeper. See ZooKeeper 3.4.8 Release Notes for details.

31 August, 2015: release 3.5.1-alpha available

This is an alpha quality release that contains many bug fixes and improvements. It also introduces a few new features, including container znodes and SSL support for client-server communication.

See the ZooKeeper 3.5.1-alpha Release Notes for details.

6 August, 2014: release 3.5.0-alpha available

This release is alpha quality and contains many improvements, new features, bug fixes and optimizations.

See the ZooKeeper 3.5.0-alpha Release Notes for details. Alternatively, you can look at the Jira issue log for all releases.

10 March, 2014: release 3.4.6 available

The release fixes a critical bug that could prevent a server from joining an established ensemble. See
ZooKeeper 3.4.6 Release Notes for details.

18 November, 2012: release 3.4.5 available

The release fixes a critical bug that could cause client connection issues. See
ZooKeeper 3.4.5 Release Notes for details.

23 September, 2012: release 3.4.4 available

The release fixes a critical bug that could cause data inconsistency. See
ZooKeeper 3.4.4 Release Notes for details.

02 August, 2012: release 3.3.6 available

The release fixes a critical bug that could cause data loss. See
ZooKeeper 3.3.6 Release Notes for details.

20 March, 2012: release 3.3.5 available

The release fixes a critical bug that could cause data corruption. See
ZooKeeper 3.3.5 Release Notes for details.

13 Feb, 2012: release 3.4.3 available

This release fixes critical bugs in 3.4.2. See
ZooKeeper 3.4.3 Release Notes for details.

We are now upgrading this release to a beta release given that we have had quite a few bug fixes to 3.4 branch and 3.4 releases have been out for some time now.

29 Dec, 2011: release 3.4.2 available

This release fixes a critical bug in 3.4.1. See
ZooKeeper 3.4.2 Release Notes for details.

Please note that this is still an alpha release and we do not recommend this for production. Please use the stable release line 3.3.* for production use.

16 Dec, 2011: release 3.4.1 available

This release fixes a critical bug with data loss in 3.4.0. See
ZooKeeper 3.4.1 Release Notes for details.
In case you are already using 3.4.0 release please upgrade ASAP.

Please note that this is an alpha release and not ready for production as of now.

26 Nov, 2011: release 3.3.4 available

The release fixes a number of critical bugs that could cause data corruption. See
ZooKeeper 3.3.4 Release Notes for details.

22 Nov, 2011: release 3.4.0 available

Due to data loss issues, this release has been removed from the downloads page. Release 3.4.1 is now available.

27 Feb, 2011: release 3.3.3 available

The release fixes two critical bugs that could cause data corruption. It also addresses 12 other issues. See
ZooKeeper 3.3.3 Release Notes for details.

11 Nov, 2010: release 3.3.2 available

This release contains a number of critical bug fixes.

See the ZooKeeper 3.3.2 Release Notes for details. Alternatively, you can look at the Jira issue log for all releases.

17 May, 2010: release 3.3.1 available

This release contains a number of critical bug fixes.

See the ZooKeeper 3.3.1 Release Notes for details. Alternatively, you can look at the Jira issue log for all releases.

25 March, 2010: release 3.3.0 available

This release contains many improvements, new features, bug fixes and optimizations.

See the ZooKeeper 3.3.0 Release Notes for details. Alternatively, you can look at the Jira issue log for all releases.

14 December, 2009: release 3.2.2 available

This release contains a number of critical bug fixes.

See the ZooKeeper 3.2.2 Release Notes for details. Alternatively, you can look at the Jira issue log for all releases.

14 December, 2009: release 3.1.2 available

This release contains a number of critical bug fixes.

See the ZooKeeper 3.1.2 Release Notes for details. Alternatively, you can look at the Jira issue log for all releases.

4 September, 2009: release 3.2.1 available

This release contains a number of critical bug fixes.

See the ZooKeeper 3.2.1 Release Notes for details. Alternatively, you can look at the Jira issue log for all releases.

8 July, 2009: release 3.2.0 available

This release contains many improvements, new features, bug fixes and optimizations.

See the ZooKeeper 3.2.0 Release Notes for details. Alternatively, you can look at the Jira issue log for all releases.

27 March, 2009: release 3.1.1 available

This release contains a small number of bug fixes.

See the ZooKeeper 3.1.1 Release Notes for details. Alternatively, you can look at the Jira issue log for all releases.

13 February, 2009: release 3.1.0 available

This release contains many improvements, new features, bug fixes and optimizations.

See the ZooKeeper 3.1.0 Release Notes for details. Alternatively, you can look at the Jira issue log for all releases.

4 December, 2008: release 3.0.1 available

This release contains many improvements, new features, bug fixes and optimizations.

See the ZooKeeper 3.0.1 Release Notes for details. Alternatively, you can look at the Jira issue log for all releases.

27 October, 2008: release 3.0.0 available

This release contains many improvements, new features, bug fixes and optimizations.

See the ZooKeeper 3.0.0 Release Notes for details. Alternatively, you can look at the Jira issue log for all releases.