Several input and output types in mapreduce

Explain the several input and output types supported by the mapreduce?

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Mapreduce framework offers a user with several different output and input types.

For example: Every line is a key/value pair. The key is defined as the offset of the line from beginning of file and value are the contents of line. It is on the will of the user. Also a user may add the functionality at his will in order to support new input and output kinds.

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