With the help of two examples name the map and reduce function purpose?
      get the app get the app       get the app       get the app
With the help of two examples name the map and reduce function purpose?


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    Distributed grep: A line is emitted by the map function if it matches a pattern. The reduce function is an identity function that copies supplied intermediate data for output.

    Term-vector per host: In this the map function emits a hostname, vector pair for every document (input). The reduce function adds all the term vectors pairs generated and discards any infrequent terms.

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