Apache ZooKeeper

Clone this repo:
  1. 9a5da5f ZOOKEEPER-4331: add headers back in osgi artifact by Wu, Xiaokai (Marvin) · 3 days ago master
  2. b05ea1a ZOOKEEPER-4211: Expose Per Namespace Quota Metrics to Prometheus by liwang · 8 days ago
  3. 7a368b4 ZOOKEEPER-4204: Remove unnecessary creation of thousands of thread in… by Amichai Rothman · 8 days ago
  4. e7de1cf ZOOKEEPER-4333: QuorumSSLTest - testOCSP fails on JDK17 by Enrico Olivelli · 8 days ago
  5. a692cba ZOOKEEPER-4289: Reduce the performance impact of Prometheus metrics by liwang · 9 days ago

Apache ZooKeeper GitHub Actions CI Travis CI Maven Central License

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For the latest information about Apache ZooKeeper, please visit our website at:


and our wiki, at:


Packaging/release artifacts

Either downloaded from https://zookeeper.apache.org/releases.html or found in zookeeper-assembly/target directory after building the project with maven.


    Contains all the source files which can be built by running:
    mvn clean install

    To generate an aggregated apidocs for zookeeper-server and zookeeper-jute:
    mvn javadoc:aggregate
    (generated files will be at target/site/apidocs)


    Contains all the jar files required to run ZooKeeper
    Full documentation can also be found in the docs folder

As of version 3.5.5, the parent, zookeeper and zookeeper-jute artifacts are deployed to the central repository after the release is voted on and approved by the Apache ZooKeeper PMC:


Java 8

If you are going to compile with Java 1.8, you should use a recent release at u211 or above.


We always welcome new contributors to the project! See How to Contribute for details on how to submit patch through pull request and our contribution workflow.