MapReduce is a patented software framework introduced by Google to support distributed computing on large data sets on clusters of computers.The framework is inspired by map and reduce functions commonly used in functional programming although their purpose in the MapReduce framework is not the same as their original forms. MapReduce libraries have been written in C++, C#, Erlang, Java, Ocaml, Python, Ruby, F#, R and other programming languages.( Source)
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