本书介绍了hadoop框架，给出了编写和运行hadoop数据处理所需的实践技能。-this book introduces the basics for understanding and using Hadoop.

We describe the hardware components that make up a Hadoop cluster, as well

as the installation and confi guration to create a working system. We cover the

MapReduce framework at a high level and get your fi rst MapReduce program up

and running.