启动namenode,报错 Operation category READ is not supported in state standby解决办法
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hdfs haadmin -transitionToActive --forcemanual nn1
输入以上代码，即可正常启动namenode
原因：hdfs写的那台机器是待机状态的，所以不支持，要在active 机器中写才行
参考自：http://blog.csdn.net/u012599988/article/details/46926851 博主：UpUpUpUpUpUpUp
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