Apache ZooKeeper

What Does Apache ZooKeeper Mean?

Apache ZooKeeper is an open-source Apache project that is meant to allow clusters to distribute information such as configuration, naming and group services over large clusters. The project was originally a sub-project of Apache Hadoop, but was made a major project in its own right managed by the Apache Software Foundation.


Techopedia Explains Apache ZooKeeper

Apache ZooKeeper is a service for providing configuration information, naming, synchronization and group services over distributed systems, including Hadoop. The rationale for the project is to make distributed systems easier to manage since many applications skimp on services that make propagating changes reliable. ZooKeeper uses a key-value store in a hierarchical fashion. It is used for high availability environments.

Apache ZooKeeper is written in Java and licensed under the Apache License 2.0. It is used by some major companies, including Rackspace, Yahoo, eBay and Reddit.


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Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.