启动hbase的时候出现如下错误：
进入NameNode UI查看NameNode变成standby，hadoop2机器的NameNode也是standby，没有active的NameNode存在
解决办法：
1、在其中一台机器中执行如下命令：
hdfs haadmin -transitionToActive --forcemanual nn1
此时就有一台机器变为active了2、重新启动hbase集群，Hmaster即可启动
Operation category READ is not supported in state standby
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