hadoop 引用 运行第三方的jar
在你的project里面建立一个lib文件夹，然后把所有的第三方jar包放到里面去，hadoop会自动加载lib依赖里面的jar。
http://www.blowide.com/2010/04/including-external-jars-in-a-hadoop-job/
注意最后一段：
Luckily, I bumped into a solution suggested Doug Cutting as an answer to someone who had a similar predicament. The solution was to create a “lib” folder in your project and copy all the external jars into this folder. According to Doug, Hadoop will look for third-party jars in this folder. It works great!
原作者给的solution。
