Apache ZooKeeper is practically a simple service that provides a centralized inventory about applications distributed across multiple servers.
2,443 downloadsUpdated: October 4, 2014Apache License
An open source centralized distribution server where information and configurations about distributed applications can be managed
To get a ZooKeeper distribution, download a recent stable release from one of the Apache Download Mirrors. Standalone Operation. Setting up a ZooKeeper server in standalone mode is straightforward. The server is contained in a single JAR file, so installation consists of creating a configuration. The output should be compared with the contents of the SHA256 file. Similarly for other hashes (SHA512, SHA1, MD5 etc) which may be provided. Windows 7 and later systems should all now have certUtil. An Apache Zookeeper-based utility for assigning unique, sequential ID numbers in a distributed system (such as a Hadoop Map/Reduce job). 1 Review Downloads: 0 This Week Last Update: 2017-05-24 See Project.
ZeeKeeper can track and monitor services, managing joint or separate configurations for each of them, keeping them and their data in sync from a central, easier to manage location.
The project was developed at first for Apache Hadoop services, but its recent versions can be used for a whole lot more than data processing.
Apache ZooKeeper is recommended for any distributed software or application that needs to manage environment changes but also needs to adhere to a governing set of rules.
Using Zookeeper also allows applications to be lighter, out-sourcing their management controls to a centralized location and only needing to handle one or few finite jobs instead.
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The Apache ZooKeeper system for distributed coordination is a high-performance service for building distributed applications.
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Release Notes
Release notes for Apache Zookeeper releases are available in Jira: Browse release notes
News9 September, 2020: release 3.6.2 available
This is a bugfix release for 3.6 branch.
It is a minor release and it fixes a few critical issues and brings a few dependencies upgrades.
See ZooKeeper 3.6.2 Release Notes for details.
11 May, 2020: release 3.5.8 available
This is a bugfix release for 3.5 branch.
It fixes 24 issues, including third party CVE fixes, several leader-election related fixes and a compatibility issue with applications built against earlier 3.5 client libraries (by restoring a few non public APIs).
See ZooKeeper 3.5.8 Release Notes for details.
30 April, 2020: release 3.6.1 available
This is the second release for 3.6 branch.
It is a bugfix release and it fixes a few compatibility issues with applications built for ZooKeeper 3.5. The upgrade from 3.5.7 to 3.6.1 can be executed as usual, no particular additional upgrade procedure is needed. ZooKeeper 3.6.1 clients are compatible with 3.5 servers as long as you are not using new APIs not present in 3.5.
See ZooKeeper 3.6.1 Release Notes for details.
04 March, 2020: release 3.6.0 available
This is the first release for 3.6 branch.
It comes with lots of new features and improvements around performance and security. It is also introducing new APIS on the client side. 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.
See ZooKeeper 3.6.0 Release Notes for details.
14 February, 2020: release 3.5.7 available
This is a bugfix release for 3.5 branch.
It fixes 25 issues, including third party CVE fixes, potential data loss and potential split brain if some rare conditions exists.
See ZooKeeper 3.5.7 Release Notes for details.
19 October, 2019: release 3.5.6 available
This is a bugfix release for 3.5 branch.
It fixes 29 issues, including CVE fixes, hostname resolve issue and possible memory leak.
See ZooKeeper 3.5.6 Release Notes for details.
20 May, 2019: release 3.5.5 available
First stable version of 3.5 branch. This release is considered to be the successor of 3.4 stable branch and recommended for production use.
It contains 950 commits, resolves 744 issues, fixes 470 bugs and includes the following new features:
Various performance and stability improvements.
Please also note:
Thanks to the contributors for their tremendous efforts to make this release happen.
See ZooKeeper 3.5.5 Release Notes for details.
2 April, 2019: release 3.4.14 available
This is a bugfix release. It fixes 8 issues, mostly build / unit tests issues, dependency updates flagged by OWASP, NPE and a name resolution problem. Among these it also supports experimental Maven build and Markdown based documentation generation. See ZooKeeper 3.4.14 Release Notes for details. Autocad won download on mac.
15 July, 2018: release 3.4.13 availableApache Zookeeper Download For Mac Os
This is a bugfix release. It fixes 17 issues, including issues such as ZOOKEEPER-2959 that could cause data loss when observer is used, and ZOOKEEPER-2184 that prevents ZooKeeper Java clients working in dynamic IP (container / cloud) environment. See ZooKeeper 3.4.13 Release Notes for details.
17 May, 2018: release 3.5.4-beta available
3.5.4-beta is the second beta in the planned 3.5 release line leading up to a stable 3.5 release. It comprises 113 bug fixes and improvements.
Release 3.5.3 added a new feature ZOOKEEPER-2169 'Enable creation of nodes with TTLs'. There was a major oversight when TTL nodes were implemented. The session ID generator for each server is seeded with the configured Server ID in the high byte. TTL Nodes were using the highest bit to denote a TTL node when used in the ephemeral owner. This meant that Server IDs > 127 that created ephemeral nodes would have those nodes always considered TTL nodes (with the TTL being essentially a random number). ZOOKEEPER-2901 fixes the issue. By default TTL is disabled and must now be enabled in zoo.cfg. When TTL Nodes are enabled, the max Server ID changes from 255 to 254. See the documentation for TTL in the administrator guide (or the referenced JIRAs) for more details.
1 May, 2018: release 3.4.12 available
This release fixes 22 issues, including issues that affect incorrect handling of the dataDir and the dataLogDir. Ky-sr9800 driver download mac. See ZooKeeper 3.4.12 Release Notes for details.
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.
WARNING: ZOOKEEPER-2960 was recently identified as a regression in 3.4.11 affecting the specification of separate dataDir and dataLogDir configuration parameters (vs the default which is a single directory for both). It will be addressed in 3.4.12.
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. Download musicnotes player for mac.
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.
Apache Zookeeper Windows27 October, 2008: release 3.0.0 availableApache Zookeeper Download For Mac Os
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.
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