When you are running a service distributed across a large cluster of machines, even tasks like reading con guration information can be hard to implement reliably. ZooKeeper is an open source software project of the Apache Software Foundation that provides a a centralized service for maintaining con guration information, naming, providing distributed synchronization, and providing group services. 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 and elegantly handles a node crashing. It is described as a distributed consensus engine where clients can connect to any node and be assured that they will receive the correct, up-to-date information. A quorum of ZooKeeper nodes exists where the clients can thus ask another ZooKeeper master if the rst fails to answer. ZooKeeper nodes store their data in a hierarchical name space, much like a le system or a trie datastructure. Clients can read and write from/to the nodes and in this way have a shared con guration service
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