Operation category READ is not supported in state standby
Namenode 開啟HA之後,由於zookeeper異常，出現腦裂現象
執行
$./hdfs haadmin -getServiceState nn1
standby
$./hdfs haadmin -getServiceState nn2
standby
兩個互為HA的namenode節點均處於standby 狀態，隨後執行
$/hdfs haadmin -transitionToActive --forcemanual nn1
強行手工將namenode1狀態轉換為active
PS： serverID即namenodeID，可以訪問http://namenodeip:50070界面查看
Operation category READ is not supported in state standby
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