At Yahoo!, we have developed a fault-tolerant coordination service called ZooKeeper [4] that allows large scale applications to implement coordination tasks such as leader election, status propagation, and rendezvous. ZooKeeper forgoes locks [2] and instead implements simple wait-free data objects [3] along with a consistency model that guarantees linearizable updates and FIFO order for client operations. We have found the service to be flexible with performance that meets the production demands of the Web-scale applications of Yahoo!.
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