Hadoop SafeModeException: xxxxxxx. Name node is in safe mode解决办法
2012-04-23 18:10
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如上图所示，在copy文件的时候，提示“Name node is in safe mode”，
这表示Hadoop的NameNode正处于安全模式，
解除的办法是，执行命令：hadoop dfsadmin -safemode leave
附dfsadmin命令参数解释：
hadoop dfsadmin -safemode value
参数value的说明如下：
enter - 进入安全模式
leave - 强制NameNode离开安全模式
get - 返回安全模式是否开启的信息
wait - 等待，一直到安全模式结束
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