具体参考：
http://f.dataguru.cn/thread-173335-1-1.html
http://www.infoq.com/cn/articles/hadoop-2-0-namenode-ha-federation-practice-zh
http://mmicky.blog.163.com/blog/static/150290154201401812127758/
Hadoop 2.0 NameNode HA和Federation实践
原文：http://www.cnblogs.com/xiaohuangya/p/3528596.html