Permission denied: user=root, access=WRITE, inode="/":hdfs:supergroup:drwxr-xr-xhd
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hadoop中执行操作时错误提示如下：
Permission denied: user=root, access=WRITE, inode="/":hdfs:supergroup:drwxr-xr-x
权限问题，需要修改目标操作的权限，或者修改操作的用户。
可以用 hdfs dfs -ls / 查看各个目录的所属用户
如果目录或文件所属用户不对，需要修改： hdfs dfs -chown -R user：group 目标文件
执行 hadoop jar时候 输出目录可能需要手动添加和设置权限，否则执行时候会提示
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