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301.2.1-Map Reduce – Basics

Contents

  • What is MapReduce
  • Map Reduce Algorithm
  • Map Reduce Program
  • Word Count map reduce example

MapReduce Programming

Map Reduce Model

  • Distributed Computing for distributed data
  • Achieve the final objective by two stage Map and Reduce method of computation

Map Reduce

  • Programming style is inspired from functional programming languages (eg. Lisp)
  • Map()
  • Process a KV pair (key- value pair) to generate intermediate key-value pairs
  • Reduce()
  • Merge all intermediate values associated with the same key to generate final result
  • Using MapReduce model it is easy to scale data processing over multiple computing nodes.
22nd March 2018
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