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Editor to share with you the example analysis of file access permissions in HDFS, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Permission mode is required for both files and directories in Linux, and there is a permission mode very similar to POSIX in HDFS.

There are three types of permission modes: read-only permission (r), write permission (w) and executable permission (x).

Read-only permission is required when reading files or listing directory contents. Write permission is required when writing to a file or creating and deleting files or directories on a directory.

Each file and directory has its own user (owner), group (group) and mode (mode). This mode consists of the permissions of the users to which they belong, the permissions of members of the group, and the permissions of other users.

It is important to enable permission control in HDFS to prevent users or automated tools and programs from accidentally modifying or deleting important parts of the file system. (this is also the default setting in HDFS, see the dfs.permissions property.)

In HDFS, if permission checking is enabled, the user permissions of the client are checked to see if the user name of the client matches the user, and the group permissions are also checked to see if the client is a member of the user group, and if not, other permissions are checked.

There is also a concept of superuser (super-user) in HDFS: the superuser is the identity of the NameNode process, and for the superuser, the system does not perform any permission checks.

The above is all the contents of the article "sample Analysis of File access permissions in HDFS". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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