The Apache Hadoop software library is a framework that allows for the distributed processing of large data sets across clusters of computers using simple programming models. It is designed to scale up from single servers to thousands of machines, each offering local computation and storage. Rather than rely on hardware to deliver high-availability, the library itself is designed to detect and handle failures at the application layer, so delivering a highly-available service on top of a cluster of computers, each of which may be prone to failures.
Hadoop is Open Source
Hadoop cluster is Highly Scalable
Hadoop provides Fault Tolerance
Hadoop provides High Availability
Hadoop is very Cost-Effective
Hadoop is Faster in Data Processing
Hadoop is based on Data Locality concept
Hadoop provides Feasibility.