Apache ZooKeeper
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Apache ZooKeeper is a software project of the Apache Software Foundation, providing an open source centralized configuration service and naming registry for large distributed systems. 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.[1]
ZooKeeper is used by companies including Rackspace and Yahoo![2] as well as open source enterprise search systems like Solr.
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