org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.ipc.StandbyException): Operation category READ is not supported in state standby 此问题,原来从web 页面查看,是两个节点都变成了standy,所以要切换
hdfs haadmin -transitionToActive --forcemanual nn1
再次访问就变一active,一个standy
原文:http://www.cnblogs.com/lanblogs/p/6438348.html