Apache ZooKeeper

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ZooKeeper
Developer(s) Apache Software Foundation
Stable release 3.4.6 / March 10, 2014 (2014-03-10)
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 master if the first fails to answer. ZooKeeper nodes store their data in a hierarchical name space, much like a file system or a trie datastructure. Clients can read and write from/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[3] and eBay as well as open source enterprise search systems like Solr.[4]

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