1)停止Hadoop集群
2)确保所有的服务器上zkServer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 ~]$
3)在Hadoop的主服务器66上执行格式化命令行
hadoop namenode -format