eclipse搭建hadoop 0.20.2开发环境.

1. 两种选择
1）使用eclipse-plugin for hadoop
遇到的问题 error:“run on hadoop”没反应。

eclipse plugin for hadoop is out of date. 
You have to use eclipse plugin for hadoop 0.20.3. Download here

2）使用karmasphere社区版，其它版本是要收费的，这个好像很不错。

2. 将hadoop-eclipse-plugin-0.20.3拷贝到eclipse的plugin目录就可以使用了。

3. 配置javadoc for hadoop
在项目属性中选择
java Build Path -> Libraries -> hadoop-0.20.0-ant.jar
java Build Path -> Libraries -> hadoop-0.20.0-core.jar
java Build Path -> Libraries -> hadoop-0.20.0-tools.jar 
添加
source: /root/hadoop-0.20.2/src
attach: /root/hadoop-0.20.2/docs/api