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Apache Hadoop is an open source software framework that supports data-intensive distributed applications licensed under the Apache v2 license. It enables applications to work with thousands of computational independent computers and petabytes of data. Hadoop was derived from Google's MapReduce and Google File System (GFS) papers. Hadoop is a top-level Apache project being built and used by a global community of contributors, written in the Java programming language. Yahoo! has been the largest contributor to the project, and uses Hadoop extensively across its businesses. On February 19, 2008, Yahoo! Inc. launched what it claimed was the world's largest Hadoop production application. The Yahoo! Search Webmap is a Hadoop application that runs on more than 10,000 core Linux cluster and produces data that is now used in every Yahoo! Web search query. There are multiple Hadoop clusters at Yahoo!, and no HDFS filesystems or MapReduce jobs are split across multiple datacenters. Every hadoop cluster node bootstraps the Linux image, including the Hadoop distribution. Work that the clusters perform is known to include the index calculations for the Yahoo! search engine. On June 10, 2009, Yahoo! made available the source code to the version of Hadoop it runs in production. Yahoo! contributes back all work it does on Hadoop to the open-source community. The company's developers also fix bugs and provide stability improvements internally, and release this patched source code so that other users may benefit from their effort. In 2010 Facebook claimed that they had the largest Hadoop cluster in the world with 21 PB of storage. On July 27, 2011 they announced the data had grown to 30 PB. Besides Facebook and Yahoo!, many other organizations are using Hadoop to run large distributed computations. Some of the notable users include: (Excerpt from <a href="http://en.wikipedia.org/wiki/Apache_Hadoop">Wikipedia article: Hadoop</a>)

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