Operation category READ is not supported in state standby 故障解决
(org.apache.hadoop.ipc.StandbyException): Operation category READ is not supported in s ...
原文：Operation category READ is not supported in state standby 故障解决
意思是：该主机状态为待机,不支持操作类别READ. 出错的是hadoop的hdfs。 你会发现最基本的hdfs命令都不能执行，例如：hadoop fs ls 自定义的是nn 还是namenode 等自定义名可以在配置文件hdfs site.xml中查看： lt property gt lt name gt dfs.ha.namenodes.mycluster lt name gt lt value ...
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