Datanode

The datanode is a commodity hardware having the GNU/Linux operating system and datanode software. For every node (Commodity hardware/System) in a cluster, there will be a datanode. These nodes manage the data storage of their system.

• Datanodes perform read-write operations on the file systems, as per client request.
• They also perform operations such as block creation, deletion, and replication according to the instructions of the namenode.

Namenode

The namenode is the commodity hardware that contains the GNU/Linux operating system and the namenode software. It is a software that can be run on commodity hardware. The system having the namenode acts as the master server and it does the following tasks:

• Manages the file system namespace.
• Regulates client’s access to files.
• It also executes file system operations such as renaming, closing, and opening files and directories.