When you are running a service distributed across a large cluster of machines, even tasks like reading conguration 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 conguration 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 conguration service
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