https://www.cnblogs.com/jichui/p/10444871.html
https://www.ibm.com/developerworks/cn/opensource/os-cn-hadoop-name-node/index.html
https://www.cnblogs.com/jichui/p/10444871.html
https://www.ibm.com/developerworks/cn/opensource/os-cn-hadoop-name-node/index.html