HDFS的HA高可用资料 https://www.cnblogs.com/jichui/p/10444871.html https://www.ibm.com/developerworks/cn/opensource/os-cn-hadoop-name-node/index.html https://hadoop.apache.org/docs/r3.2.1/hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithQJM.html