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

Setting up Hive


In this section, we will walk through the act of downloading, installing, and configuring Hive.

Prerequisites

Unlike Hadoop, there are no Hive masters, slaves, or nodes. Hive runs as a client application that processes HiveQL queries, converts them into MapReduce jobs, and submits these to a Hadoop cluster.

Although there is a mode suitable for small jobs and development usage, the usual situation is that Hive will require an existing functioning Hadoop cluster.

Just as other Hadoop clients don't need to be executed on the actual cluster nodes, Hive can be executed on any host where the following are true:

  • Hadoop is installed on the host (even if no processes are running)

  • The HADOOP_HOME environment variable is set and points to the location of the Hadoop installation

  • The ${HADOOP_HOME}/bin directory is added to the system or user path

Getting Hive

You should download the latest stable Hive version from http://hive.apache.org/releases.html.

The Hive getting started guide at http:/...