Question

Why we require SSH during hadoop installation

Answer 1

Hey,

SSH setup is required to do different operations on a cluster such as starting, stopping, distributed daemon shell operations.

Hadoop core requires shell i.e, (SSH) to communicate with slave nodes and to create the process on to the slave nodes. The communication will be frequent when the cluster is live and working in a fully distributed environment.

For our single-node setup of Hadoop, we, therefore need to configure SSH access to localhost for the Hadoop user.

Answer 2

When a Hadoop cluster is built, there are slave nodes and master nodes. Master node controls the tasks on the slave nodes. Every node is a different system and to maintain a connection between these nodes, SSH is used. SSH is mainly used so that the master node can stay connected with the slave nodes.