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Hadoop and Distributed Computing at Yahoo! Introduction Apache Hadoop* is an open source Java software framework for running data-intensive applications on large clusters of commodity hardware. Hadoop is a top level Apache project. It relies on an active community of contributors from all over the world for its success. Hadoop implements two important elements. The first is a computational paradigm called Map/Reduce, which takes an application and divides it into multiple fragments of work, each of which can be executed on any node in the cluster. The second is a distributed file system called HDFS. HDFS stores data on nodes in the cluster with the goal of providing greater bandwidth across the cluster. The Hadoop project is extremely important to us here at Yahoo!. We run the world's largest Hadoop clusters, work with academic institutions and other large corporations on advanced cloud computing research and our engineers are active participants in the Hadoop community.