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MapReduce: Simplified Data Processing on Large Clusters

MapReduce: Simplified Data Processing on Large Clusters

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data sets. Users specify a map function that processes a key/valuepairtogeneratea setofintermediatekey/value pairs, and a reduce function that merges all intermediate values associated with the same intermediate key. Many real world tasks are expressible in this model, as shown in the paper. Programs written in this functional style are automati-

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