Hadoop 2.0 NameNode HA和Federation实践
http://www.infoq.com/cn/articles/hadoop-2-0-namenode-ha-federation-practice-zh/
HDFS Federation(HDFS 联盟)介绍
http://blog.csdn.net/strongerbit/article/details/7013221
Hadoop NameNode 高可用 (High Availability) 实现解析
http://www.ibm.com/developerworks/cn/opensource/os-cn-hadoop-name-node/
