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<h1>About Hadoop</h1>
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<a name="N1000C"></a><a name="Overview"></a>
<h2 class="h3">Overview</h2>
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<p>Hadoop is a framework for running applications on large
      clusters of commodity hardware. The Hadoop framework
      transparently provides applications both reliability and data
      motion. Hadoop implements a computational paradigm named
      map/reduce, where the application is divided into many small
      fragments of work, each of which may be executed or reexecuted
      on any node in the cluster. In addition, it provides a
      distributed file system that stores data on the compute nodes,
      providing very high aggregate bandwidth across the cluster. Both
      map/reduce and the distributed file system are designed so that
      node failures are automatically handled by the framework.</p>
<p>The intent is to scale Hadoop up to handling thousand of
      computers. Hadoop has been tested on clusters of 600
      nodes.</p>
<p>Hadoop is a <a href="http://lucene.apache.org/java/">Lucene</a> sub-project
      that contains the distributed computing platform that was
      formerly a part of <a href="http://lucene.apache.org/nutch/">Nutch</a>.  This
      includes the Hadoop Distributed Filesystem (HDFS) and an
      implementation of map/reduce.</p>
<p>For more information about Hadoop, please see the <a href="http://wiki.apache.org/lucene-hadoop/">Hadoop wiki.</a>
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