代码下载地址；
https://github.com/winghc/hadoop2x-eclipse-plugin.git
$cd src/contrib/eclipse-plugin
$ant jar -Dversion=2.3.0 -Declipse.home=/opt/eclipse -Dhadoop.home=/usr/share/hadoop
final jar will be genrated at directory
$root/build/contrib/eclipse-plugin/hadoop-eclipse-plugin-2.2.0.jar
