MapReduce Tutorial - A Beginner's Guide

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Introduction to MapReduce

MapReduce tutorial covers the introduction to MapReduce, its definition, why MapReduce, algorithms, examples, installation, API (Application Programming interface), implementation of MapReduce, MapReduce Partitioner, MapReduce Combiner, and administration.

Why to use MapReduce?

Initially created by Google, MapReduce soon gained immense popularity due to its unmatched qualities, which mandated big data players to deploy it. Some of its unique features are as follows:

Features Description
Flexibility Can be developed in any language like Java, c++, python, etc.
Scalability Able to process petabytes of data on a single cluster
Recovery Takes care of failure by storing the replica on another machine
Lesser data motion Processing tasks appear on physical nodes which increases the speed in turn.

To learn more about MapReduce check out Intellipaat’s MapReduce Cheat Sheet.

Apart from the above key features some of the key highlights of this technology are:

  • Map task stores data into a local disk while Reduce task in HDFS.
  • Map tasks are created for each split of equal size which is equal to an HDFS block~ 64 MB
  • Tasktracker sends heartbeat signals to notify about the current state.

Certification in Bigdata Analytics

This blog will help you get a better understanding of Hadoop MapReduce – What it Refers To?

Last year MapReduce received the first place at “TeraByte Sort Benchmark”. They used 910 nodes, every node with two cores, i.e.,  a total of 1820 cores and were able to store the entire data in memory across the nodes. By implementation of MapReduce they were able to arrange entire one terabyte of data in 209 seconds. Users program, i.e., map and reduce functions in ANSI C.

Let’s delve further into this MapReduce tutorial.

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1 thought on “MapReduce Tutorial - Learn MapReduce Basics in 5 Days”

  1. My Question is related to classes which are used in Map and Reduce class like LongWriteable and IntWriteable respectively.
    Why map function use LongWriteable instead of IntWritable and why reduce function use IntWriteable instead of LongWriteable. or can i use based on my choices between these two. I understood their work and about Text parameter too. but my question is specific to map funtion first parameter and reduce function second parameter. is there any theory that i wanted to know.

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