Grokking the Advanced System Design Interview
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HDFS Characteristics

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:

  1. Read permission (r): For files, r permission is required to read a file. For directories, r permission is required to list the contents of a directory. 2




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