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Hadoop is a free, Java based programming framework that supports the processing of large data sets in a distributed computing environment. Hadoop is developed to scale up from a single server to thousands of systems, with a very high degree of fault tolerance. With the help of Hadoop it is easy to run applications on systems with thousands of nodes involving thousands of terabytes. The main advantage of Hadoop is that businesses and organizations can now find value in data that was recently considered useless.