啟動hbase的時候出現如下錯誤：
進入NameNode UI查看NameNode變成standby，hadoop2機器的NameNode也是standby，沒有active的NameNode存在
解決辦法：
1、在其中一台機器中執行如下命令：
hdfs haadmin -transitionToActive --forcemanual nn1
此時就有一台機器變為active了2、重新啟動hbase集群，Hmaster即可啟動
Operation category READ is not supported in state standby
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