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Why Hadoop MapReduce uses key-value pair to process the data?

Why Hadoop MapReduce uses key-value pair to process the data?

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Hadoop MapReduce uses a key-value pair to process the data in an efficient manner. The MapReduce concept is actually derived from Google white papers which uses this concept. Key-value pairs are not part of the input data, but rather the input data is split in the form of key and value to be processed in the mapper.