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标签 Tag : safemode

Hadoop报Name node is in safe mode 错误

<Category: Hadoop, 云里雾里> Comments Off on Hadoop报Name node is in safe mode 错误

运行hadoop程序时,有时候会报以下错误:
org.apache.hadoop.dfs.SafeModeException: Cannot delete /user/hadoop/input. Name node is in safe mode

在分布式文件系统启动的时候,开始的时候会有安全模式,当分布式文件系统处于安全模式的情况下,文件系统中的内容不允许修改也不允许删除,直到安全模式结束。安全模式主要是为了系统启动的时候检查各个DataNode上数据块的有效性,同时根据策略必要的复制或者删除部分数据块。运行期通过命令也可以进入安全模式。在实践过程中,系统启动的时候去修改和删除文件也会有安全模式不允许修改的出错提示,只需要等待一会儿即可。

解决办法:

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