Hadoop HDFS HA show two StandBy NameNode
原因：可能是zkfc服务没有启动，正确的流程如下
1、在nn001上格式化zkfc
sudo -u hdfs hdfs zkfc -formatZK
2、在三个（或以上）节点上启动journalnode
service hadoop-hdfs-journalnode start
3、在nn001上格式化namenode，并启动nn
sudo -u hdfs hdfs namenode -format
service hadoop-hdfs-namenode start
4、在nn002上格式化备用namenode
sudo -u hdfs hdfs namenode -bootstrapStandby
service hadoop-hdfs-namenode start
5、在nn001和nn002上启动zkfc服务
nn001/nn002
service hadoop-hdfs-zkfc start
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