In today's era of big data, most of the organizations are concentrating to use Hadoop as a centralized data store. Data size is growing day by day, and organizations want to derive some insights and make decisions using the important information. While everyone is focusing on collecting the data, but having all the data at a centralized place increases the risk of data security. Securing the data access of Hadoop Distributed File System (HDFS) is very important. Hadoop security means restricting the access of data to only authorized users and groups. Furthermore, when we talk about security, there are two major things—Authentication and Authorization.

HDFS supports a permission model for files and directories that is much equivalent to the standard POSIX model. Similar to UNIX permissions, each file and directory in HDFS is associated with an owner, group, and another users. There are three types of permissions in HDFS—read, write, and execute.

In contrast to the UNIX permission...