Apache ZooKeeper

Clone this repo:
  1. 1590a42 ZOOKEEPER-4281: Allow packet of max packet length to be deserialized by Huizhi Lu · 6 hours ago master
  2. c583a6e ZOOKEEPER-4275: Prevent unnecessary client connection retry caused by slow SASL login by Ravi Kishore Valeti · 2 days ago
  3. ea75e1f ZOOKEEPER-4247: NPE while processing message from restarted quorum member by Mate Szalay-Beko · 7 days ago
  4. 7fdadf7 ZOOKEEPER-3764: Add High Availability Guarantee Into Docs by Winbobob · 11 days ago
  5. 925b5b2 ZOOKEEPER-4278: dependency-check:check failing - netty-transport-4.1.60.Final CVE-2021-21409 by Ayush Mantri · 13 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.