This book is a concise guide to getting started with Hadoop and getting the most out of your Hadoop clusters. My early experiences with Hadoop were wonderful and stressful. While Hadoop supplied the tools to scale applications, it lacked documentation on how to use the framework effectively. This book provides that information. It enables you to rapidly and pa- lessly get up to speed with Hadoop. This is the book I wish was available to me when I started using Hadoop. Who This Book Is For This book has three primary audiences: developers who are relatively new to Hadoop or MapReduce and must scale their applications using Hadoop; system administrators who must deploy and manage the Hadoop clusters; and application designers looking for a detailed understanding of what Hadoop will do for them. Hadoop experts will learn some new details and gain insights to add to their expertise. How This Book Is Structured This book provides step-by-step instructions and examples that will take you from just beg- ning to use Hadoop to running complex applications on large clusters of machines. Here’s a brief rundown of the book’s contents: Chapter 1, Getting Started with Hadoop Core: This chapter introduces Hadoop Core and MapReduce applications. It then walks you through getting the software, installing it on your computer, and running the basic examples.
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