Apache ZooKeeper is a distributed coordination service that provides synchronization, naming, and configuration information for distributed applications. In the context of Hadoop and MapReduce, ZooKeeper is often used for distributed locking and leader election, which helps to coordinate tasks among the nodes in the cluster. For example, ZooKeeper can be used to elect a leader for a MapReduce job, which ensures that only one instance of the job runs at a time. Additionally, ZooKeeper can be used to store configuration information for Hadoop, such as the locations of NameNodes and DataNodes. Overall, ZooKeeper plays an important role in the reliable and efficient operation of Hadoop and MapReduce clusters.
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