Hadoop 2.0 contains four important modules of which 3 are inherited from Hadoop 1.0 and a new module YARN is added to it.
Hadoop Common – This module consists of all the basic utilities and libraries that required by other modules.
HDFS- Hadoop Distributed file system that stores huge volumes of data on commodity machines across the cluster.
MapReduce- Java based programming model for data processing.
YARN- This is a new module introduced in Hadoop 2.0 for cluster resource management and job scheduling.
