In above pics there are different physical machines in different location but in one logical machine have a common file system for all physical machine.
Apache Hadoop is a framework that allow for the distributed processing for large data sets across clusters of commodity computers using simple programming model.
It is design to scale up from a single server to thousands of machines each offering local computation and storage.
Apache Hadoop is simply a framework, it is library which build using java with objective of providing capability of managing huge amount of data.
Hadoop is a java framework providing by Apache hence to manage huge amount of data by providing certain components which have capability of understanding data providing the right storage capability and providing right algorithm to do analysis to it.
Open Source Software + Commodity Hardware = IT Costs reduction
http://wiki.apache.org/hadoop/PoweredBy
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