介绍了怎样在window平台上搭建hadoop平台，以及利用map_reduce 进行数据处理的基础知识-Describes how to build a platform in the window hadoop platform for data processing and the use of map_reduce basics

使用hadoop的mapreduce算法，前提是先要搭建一个hadoop云平台，该程序不难，为初学者的hadoop程序，对刚刚接触hadoop的同学会有帮助。-Using hadoop mapreduce algorithm, a parallel sorting algorithm, the premise is to set up a hadoop cloud platform, the program is easy, hadoop program for beginners, help

在hadoop云平台实现单表关联、多变关联(Implementation of single table Association and variable association on Hadoop cloud platform)