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What are the modules that constitute the Apache Hadoop 2.0 framework?

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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.

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