遇见问题：org.apache.hadoop.dfs.SafeModeException: Cannot delete/user/hadoop/input. Name node is in safe mode
解决办法：$bin/hadoop dfsadmin -safemode leave
如果配置了环境变量hadoop，则直接 hadoop dfsadmin -safemode leave
hadoop安全模式
原文：http://www.cnblogs.com/qiuyong/p/6944375.html
