The Web creates a considerable measure of information. With a specific end goal to hunt it successfully, Google expected to keep it listed, yet keeping up that list was to a great degree testing. To make this conceivable, Google made the MapReduce style of preparing. MapReduce programming utilizes two capacities, a guide employment that changes over an information set into key/esteem sets, and a lessen work that joins the yields of the guide work into a solitary result. This way to deal with critical thinking was then received by engineers who were taking a shot at Apache's "Nutch" web-crawler extend, and formed into Hadoop.

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