http://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithNFS.html

1）停止Hadoop集群

2）在所有服务器上执行命令行

rm -rf /home/user/hadoop-3.2.2/tmp/*
rm -rf  /home/user/hadoop-3.2.2/journal/ns1/*

3)确保所有的服务器上zkServer,以及Hadoop Journal Node都在运行

[user@NewBieSlave2 ~]$ zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /home/user/apache-zookeeper/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[user@NewBieSlave2 ~]$ zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /home/user/apache-zookeeper/bin/../conf/zoo.cfg
Client port found: 2181. Client address: localhost. Client SSL: false.
Mode: follower

[user@NewBieSlave2 ~]$ /home/user/hadoop-3.2.2/sbin/hadoop-daemon.sh start journalnode

4）在Hadoop的主服务器66上执行格式化命令行

hadoop namenode -format

5）启动Hadoop集群。