Blog Archives

MapReduce to HBase: Read from & write to

This tutorial extends 1. HBase Tutorial Getting Started & 1. Hadoop MapReduce Basic Tutorial to read an HBase table with data from the mapper and write the max marks for each subject to another HBase table from the reducer.. Input Data Marks secured by 4 students

Step 1: Let’s

Read more ›

Posted in MapReduce Tutorials

2. Hadoop MapReduce Basic Tutorial

This extends the Part 1 tutorial 1. Hadoop MapReduce Basic Tutorial. The key difference of this tutorial is using a “TextInputFormat” instead of “KeyValueTextInputFormat“. TextInputFormat reads The key as line offset number starting from 0 and the values as “Science, 80, 75, 89, 90” from the Scores.data file.

Hadoop

Read more ›

Posted in MapReduce Tutorials

1. Hadoop MapReduce Basic Tutorial

Input Data & How Hadoop reads the Data scores.data in folder:/Users/arulk/projects

Mapper Input The Hadoop “org.apache.hadoop.mapreduce.lib.input.KeyValueTextInputFormat” class read the input as key/value pairs. The default delimiter is tab. Our data is using “,“. You can change this with the “mapreduce.input.keyvaluelinerecordreader.key.value.separator” property. as in

Mapper Output The mapper will

Read more ›

Posted in MapReduce Tutorials

Take the road less travelled

Fast-track by empowering yourself to choose from multiple job offers, open more doors and increase your earning potential.

800+ Java Interview Q&As – ♥ Free | ♦ FAQs

open all | close all

Pressed for time? 200+ Quick Prep

open all | close all

16 Java Key Areas to be a top-notch

open all | close all

100+ Java Tutorials – Step by step

open all | close all

100+ Java Coding Exercises

open all | close all

How good are your

open all | close all