This lesson will explore some important aspects of HDFS architecture.
Security and permission
HDFS provides a permissions model for files and directories which is similar to POSIX. Each file and directory is associated with an owner and a group. Each file or directory has separate permissions for the owner, other users who are members of a group, and all other users. There are three types of permission:
- Read permission (
r): For files,
rpermission is required to read a file. For directories,
rpermission is required to list the contents of a directory. 2