hadoop HDFS HA 测试后双standby模式

今天测试HDFS群集active和standby切换，过程中出现了两个standby模式，运行hadoop命令出现如下报错，
15/05/18 16:31:12 INFO retry.RetryInvocationHandler: Exception while invoking getFileInfo of class ClientNamenodeProtocolTranslatorPB over Master1/192.168.19.194:9000 after 13 fail over attempts. Trying to fail over after sleeping for 14300ms.
org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.ipc.StandbyException): Operation category READ is not supported in state standby

意思是standby模式不能提供写入，使用如下命令解决：
hdfs haadmin -transitionToActive --forcemanual Master1
让Master1变更为active模式。