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"MapReduce is a programming tool developed by Google in C++ (Python and Java are supported through interfaces), in which parallel computations over large (> 1 terabyte) data sets are performed. The terminology of "Map" and "Reduce", and their general idea, is borrowed from functional programming languages use of the constructs map and reduce in functional programming and features of array programming languages. [1]

The actual software is implemented by specifying a Map function that maps key-value pairs to new key-value pairs and a subsequent Reduce function that consolidates all mapped key-value pairs sharing the same keys to single key-value pairs."

Implementation or ongoing implementation