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

Scaling


You have data and you have a running Hadoop cluster; now you get more of the former and need more of the latter. We have said repeatedly that Hadoop is an easily scalable system. So let us add some new capacity.

Adding capacity to a local Hadoop cluster

Hopefully, at this point, you should feel pretty underwhelmed at the idea of adding another node to a running cluster. All through Chapter 6, When Things Break, we constantly killed and restarted nodes. Adding a new node is really no different; all you need to do is perform the following steps:

  1. Install Hadoop on the host.

  2. Set the environment variables shown in Chapter 2, Getting Up and Running.

  3. Copy the configuration files into the conf directory on the installation.

  4. Add the host's DNS name or IP address to the slaves file on the node from which you usually run commands such as slaves.sh or cluster start/stop scripts.

And that's it!

Have a go hero – adding a node and running balancer

Try out the process of adding a new node and afterwards...