Book Image

Hadoop Beginner's Guide

Book Image

Hadoop Beginner's Guide

Overview of this book

Data is arriving faster than you can process it and the overall volumes keep growing at a rate that keeps you awake at night. Hadoop can help you tame the data beast. Effective use of Hadoop however requires a mixture of programming, design, and system administration skills."Hadoop Beginner's Guide" removes the mystery from Hadoop, presenting Hadoop and related technologies with a focus on building working systems and getting the job done, using cloud services to do so when it makes sense. From basic concepts and initial setup through developing applications and keeping the system running as the data grows, the book gives the understanding needed to effectively use Hadoop to solve real world problems.Starting with the basics of installing and configuring Hadoop, the book explains how to develop applications, maintain the system, and how to use additional products to integrate with other systems.While learning different ways to develop applications to run on Hadoop the book also covers tools such as Hive, Sqoop, and Flume that show how Hadoop can be integrated with relational databases and log collection.In addition to examples on Hadoop clusters on Ubuntu uses of cloud services such as Amazon, EC2 and Elastic MapReduce are covered.
Table of Contents (19 chapters)
Hadoop Beginner's Guide
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Time for action – checking the prerequisites


Hadoop is written in Java, so you will need a recent Java Development Kit (JDK) installed on the Ubuntu host. Perform the following steps to check the prerequisites:

  1. First, check what's already available by opening up a terminal and typing the following:

    $ javac
    $ java -version
    
  2. If either of these commands gives a no such file or directory or similar error, or if the latter mentions "Open JDK", it's likely you need to download the full JDK. Grab this from the Oracle download page at http://www.oracle.com/technetwork/java/javase/downloads/index.html; you should get the latest release.

  3. Once Java is installed, add the JDK/bin directory to your path and set the JAVA_HOME environment variable with commands such as the following, modified for your specific Java version:

    $ export JAVA_HOME=/opt/jdk1.6.0_24
    $ export PATH=$JAVA_HOME/bin:${PATH}
    

What just happened?

These steps ensure the right version of Java is installed and available from the command line...