Before we begin, make sure the following components are installed on your workstation:
This tutorial has been written for and tested with Hadoop version 0.19.1. If you are using another version, some things may not work.
Make sure you have exactly the same versions of the software as shown above. Hadoop will not work with versions of Java earlier than 1.6 and versions of Eclipse later than 3.3.2 due to plug-in API incompatibility.
After installing the prerequisite software, the next step is to install the Cygwin environment. Cygwin is a set of Unix packages ported to Microsoft Windows. It is needed to run the scripts supplied with Hadoop because they are all written for the Unix platform.
To install the cygwin environment follow these steps:
Hadoop on Windows with Eclipse -02- Prerequisites
原文:http://www.cnblogs.com/summersoft/p/7643393.html