Apache ZooKeeper

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Apache ZooKeeper
Developer(s) Apache Software Foundation
Stable release 3.4.8 / February 20, 2016 (2016-02-20)
Written in Java
Operating system Cross-platform
Type Distributed computing
License Apache License 2.0
Website zookeeper.apache.org

Apache ZooKeeper is a software project of the Apache Software Foundation, providing an open source distributed configuration service, synchronization service, and naming registry for large distributed systems.[clarification needed] ZooKeeper was a sub-project of Hadoop but is now a top-level project in its own right.

ZooKeeper's architecture supports high availability through redundant services. The clients can thus ask another ZooKeeper leader if the first fails to answer. ZooKeeper nodes store their data in a hierarchical name space, much like a file system or a tree data structure. Clients can read from and write to the nodes and in this way have a shared configuration service. Updates are totally ordered.[1]

ZooKeeper is used by companies including Rackspace, Yahoo!,[2] Odnoklassniki and eBay as well as open source enterprise search systems like Solr.[3]

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