hadoop操作HDFS文件权限问题

最新推荐文章于 2024-01-21 11:10:14 发布

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本文介绍了在Window环境下使用Eclipse进行Hadoop程序开发时遇到的权限错误问题，并提供了两种解决方案：一是修改hadoop配置文件hdfs-core.xml中的dfs.permissions属性；二是通过hdfs dfs-chmod命令来更改文件权限。

在window下使用Eclipse进行hadoop的程序编写，然后Run on hadoop 后，出现如下错误：

Exception in thread "main" org.apache.hadoop.security.AccessControlException: Permission denied: user=Administrator, access=WRITE, inode="/":root:supergroup:drwxr-xr-x
..................

解决方法：
　　修改hadoop的配置文件：hdfs-core.xml , 找到 dfs.permissions 将value值改为 false

<property>
<name>dfs.permissions</name>
<value>false</value> 
<description>
If "true", enable permission checking in HDFS.
If "false", permission checking is turned off,
but all other behavior is unchanged.
Switching from one parameter value to the other does not change the mode,
owner or group of files or directories.
</description>
</property>

修改完貌似要重启下hadoop的进程才能生效

或者使用这个命令

chmod

Usage: hdfs dfs -chmod [-R] <MODE[,MODE]... | OCTALMODE> URI [URI ...]

Change the permissions of files. With -R, make the change recursively through the directory structure. The user must be the owner of the file, or else a super-user. Additional information is in the Permissions Guide.

Options

The -R option will make the change recursively through the directory structure.