It is written in Java and supports all major platforms

It is a primary distributed storage used by Hadoop applications for storing a large amount of data

HDFS and YARN build the data management layer of Apache Hadoop

It employs a NameNode and DataNode architecture to implement a distributed file system that provides high-performance access to data across highly scalable Hadoop clusters.

Highly configurable with a default configuration well suited for many installations

Rack awareness

File permissions and authentication

Safe mode

Minimal data motion

Upgrade and Rollback

Operability