Hadoopというソフトウェアは次のようなGoogleのMapReduceとGoogle File Systemをオープン実装したものみたいです。 free Java software platform that supports running applications to process vast amounts of data. It has been developed under the Apache Lucene Project and was originally developed to support distribution for Nutch, which is an effort to build an open source search engine for the search and index component. Hadoop consists of an open source implementation of Google’s published computing infrastructure, specifically MapReduce and the Google File System.