官档：http://hadoop.apache.org/docs/r2.6.5/hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithQJM.html node01免秘钥控制node02、node03、node04 node02免秘钥控制node01 zkfc自动故障转移  原因：若nn01 active 挂了  需要把nn02