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YaCy (pronounced "ya see") is a free distributed search engine, built on principles of peer-to-peer (P2P) networks. Its core is a computer program written in Java distributed on several hundred computers, , so-called YaCy-peers. Each YaCy-peer independently crawls through the Internet, analyzes and indexes found web pages, and stores indexing results in a common database (so called index) which is shared with other YaCy-peers using principles of P2P networks. Compared to semi-distributed search engines, the YaCy-network has a decentralised architecture. All YaCy-peers are equal and no central server exists. It can be run either in a crawling mode or as a local proxy server, indexing web pages visited by the person running YaCy on his or her computer. (Several mechanisms are provided to protect the user's privacy.) Access to the search functions is made by a locally running web server which provides a search box to enter search terms, and returns search results in a similar format to other popular search engines. == System components == YaCy search engine is based on four elements:〔(【引用サイトリンク】title=YaCy Technology Architecture )〕 ;Crawler: A search robot which traverses from web page to web page and analyzes their content. ;Indexer: Creates a Reverse Word Index (RWI) i.e. each word from the RWI has its list of relevant URLs and Ranking information. Words are saved in form of word hashes. ;Search and Administration interface: Made as a web interface provided by a local HTTP servlet with servlet engine. ;Data Storage: Used to store the Reverse Word Index Database utilizing a Distributed Hash Table. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「YaCy」の詳細全文を読む スポンサード リンク
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