Hadoop: The Definitive Guide
Hadoop: The Definitive Guides the ideal guide for anyone who wants to know about the Apache Hadoop and all that can be done with it.Good book on basics of Hadoop (HDFS, MapReduce & other related technologies). This book provides all necessary details to start work with Hadoop, program using it
“Now you have the opportunity to learn about Hadoop from a master-not only of the technology, but also of common sense and plain talk.” — Doug Cutting, Hadoop Founder, Yahoo!
Latest version 4th Edition is available here – Hadoop – The Definitive Guide 4e