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In recent years Google's MapReduce has emerged as a leading large-scale data processing architecture. Adopted by companies such as Amazon, Facebook, Google, IBM and Yahoo! in daily use, and more recently put in use by several universities, it allows parallel processing of huge volumes of data over cluster of machines. Hadoop is a free Java implementation of MapReduce. In Hadoop, files are split into blocks and replicated and spread over all servers in a network. Each job is also split into many small pieces called tasks. Several tasks are processed on a single server, and a job is not completed until all the assigned tasks are finished.
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