Overview

Apache Hadoop is a collection of open-source software utilities that facilitates using a network of many computers to solve problems involving massive amounts of data and computation. It provides a software framework for distributed storage and processing of big data using the MapReduce programming model.

As such, hadoop stores the data into instances called Data Nodes, managed by a Name node as you can see below:

In that example the replication factor is set to 3, so we have 3 copy of a block in the whole cluster.

Management

Start Hadoop

Start DFS

Start Yarn

Start HBase

Check Processes

Manage HDFS

Create / List / Delete HDFS Directories