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+ZooKeeper is a centralized service for maintaining configuration information,
+naming, providing distributed synchronization, and providing group services.
+All of these kinds of services are used in some form or another by distributed
+applications. Each time they are implemented there is a lot of work that goes
+into fixing the bugs and race conditions that are inevitable. Because of the
+difficulty of implementing these kinds of services, applications initially
+usually skimp on them ,which make them brittle in the presence of change and
+difficult to manage. Even when done correctly, different implementations of
+these services lead to management complexity when the applications are
+deployed.