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Nutch
Apache Nutch is a highly extensible and scalable open source web crawler software project. Features Nutch is coded entirely in the Java programming language, but data is written in language-independent formats. It has a highly modular architecture, allowing developers to create plug-ins for media-type parsing, data retrieval, querying and clustering. The fetcher ("robot" or "web crawler") has been written from scratch specifically for this project. History Nutch originated with Doug Cutting, creator of both Lucene and Hadoop, and Mike Cafarella. In June, 2003, a successful 100-million-page demonstration system was developed. To meet the multi-machine processing needs of the crawl and index tasks, the Nutch project has also implemented a MapReduce facility and a distributed file system. The two facilities have been spun out into their own subproject, called Hadoop. In January, 2005, Nutch joined the Apache Incubator, from which it graduated to become a subproject of Lucen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nutch
Apache Nutch is a highly extensible and scalable open source web crawler software project. Features Nutch is coded entirely in the Java programming language, but data is written in language-independent formats. It has a highly modular architecture, allowing developers to create plug-ins for media-type parsing, data retrieval, querying and clustering. The fetcher ("robot" or "web crawler") has been written from scratch specifically for this project. History Nutch originated with Doug Cutting, creator of both Lucene and Hadoop, and Mike Cafarella. In June, 2003, a successful 100-million-page demonstration system was developed. To meet the multi-machine processing needs of the crawl and index tasks, the Nutch project has also implemented a MapReduce facility and a distributed file system. The two facilities have been spun out into their own subproject, called Hadoop. In January, 2005, Nutch joined the Apache Incubator, from which it graduated to become a subproject of Lucen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Doug Cutting
Douglass Read Cutting is a software designer, advocate, and creator of open-source search technology. He founded two technology projects, Lucene, and Nutch, with Mike Cafarella. Both projects are now managed through the Apache Software Foundation. Cutting and Cafarella are also the co-founders of Apache Hadoop. Education and early career Cutting graduated from Stanford University in 1985 with a bachelor's degree. Prior to developing Lucene, Cutting held search technology positions at Xerox PARC where he worked on the Scatter/Gather algorithm Cutting, Douglass R., David R. Karger, Jan O. Pedersen, and John W. Tukey. "Scatter/gather: A cluster-based approach to browsing large document collections." SIGIR '92 Proceedings of the 15th annual international ACM SIGIR conference on Research and development in information retrieval. (Reprinted in ACM SIGIR Forum, vol. 51, no. 2, pp. 148-159. ACM, 2017.) Pedersen, Jan O., David Karger, Douglass R. Cutting, and John W. Tukey. "Scatter-gath ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mike Cafarella
__NOTOC__ Mike Cafarella is a computer scientist specializing in database management systems. He is an associate professor of computer science at University of Michigan. Along with Doug Cutting, he is one of the original co-founders of the Hadoop and Nutch open-source projects. Cafarella was born in New York City but moved to Westwood, Massachusetts, Westwood, MA early in his childhood. After completing his bachelor's degree at Brown University, he earned a Ph.D. specializing in database management systems at the University of Washington under Dan Suciu and Oren Etzioni. He was also involved in several notable start-ups, including Tellme Networks, and co-founder of Lattice Data, which was acquired by Apple in 2017. Education * Ph.D., Computer Science, June 2009. University of Washington. * M.Sc., Computer Science, 2005. University of Washington. * M.Sc., Artificial Intelligence, 1997. University of Edinburgh. * B.S., Computer Science, 1996. Brown University. References Extern ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Common Crawl
Common Crawl is a nonprofit organization, nonprofit 501(c) organization#501.28c.29.283.29, 501(c)(3) organization that web crawler, crawls the web and freely provides its archives and datasets to the public. Common Crawl's Web archiving, web archive consists of petabytes of data collected since 2011. It completes crawls generally every month. Common Crawl was founded by Gil Elbaz. Advisors to the non-profit include Peter Norvig and Joi Ito. The organization's crawlers respect nofollow and Robot exclusion standard, robots.txt policies. Open source code for processing Common Crawl's data set is publicly available. The Common Crawl dataset includes copyrighted work and is distributed from the US under fair use claims. Researchers in other countries have made use of techniques such as shuffling sentences or referencing the common crawl dataset to work around copyright law in other Jurisdiction, legal jurisdictions. History Amazon Web Services began hosting Common Crawl's archive thr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hadoop
Apache Hadoop () is a collection of open-source software utilities that facilitates using a network of many computers to solve problems involving massive amounts of data and computation. It provides a software framework for distributed storage and processing of big data using the MapReduce programming model. Hadoop was originally designed for computer clusters built from commodity hardware, which is still the common use. It has since also found use on clusters of higher-end hardware. All the modules in Hadoop are designed with a fundamental assumption that hardware failures are common occurrences and should be automatically handled by the framework. The core of Apache Hadoop consists of a storage part, known as Hadoop Distributed File System (HDFS), and a processing part which is a MapReduce programming model. Hadoop splits files into large blocks and distributes them across nodes in a cluster. It then transfers packaged code into nodes to process the data in parallel. This appro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lucene
Apache Lucene is a free and open-source search engine software library, originally written in Java by Doug Cutting. It is supported by the Apache Software Foundation and is released under the Apache Software License. Lucene is widely used as a standard foundation for non-research search applications. Lucene has been ported to other programming languages including Object Pascal, Perl, C#, C++, Python, Ruby and PHP. History Doug Cutting originally wrote Lucene in 1999. Lucene was his fifth search engine, having previously written two while at Xerox PARC, one at Apple, and a fourth at Excite. It was initially available for download from its home at the SourceForge web site. It joined the Apache Software Foundation's Jakarta family of open-source Java products in September 2001 and became its own top-level Apache project in February 2005. The name Lucene is Doug Cutting's wife's middle name and her maternal grandmother's first name. Lucene formerly included a number of sub-projec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MozDex
mozDex was a project to build an Internet-scale search engine with free and open source software (FOSS) technologies like Nutch. Since its search algorithms and code were open, it was hoped that no search results could be manipulated by either mozDex as a company or anyone else. As such, instead of having to trust mozDex to be fair, it puts the trust on the community of users through the same "peer review" process that is believed to enhance security of free software like Linux. mozDex aimed to make it easy and encourage building upon this open search technology to extend it with various additional potentially useful search related features. Some of the latest features added or announced by mozDex included social bookmarking via free skimpy service, "''did you mean''" spell checking, anti-spam technology and instant crawl. As an open search engine, mozDex relied heavily on community feedback and actively solicited user opinions as well as encouraged discussions about various aspe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Internet Search Engines
A search engine is a software system designed to carry out Web search query, web searches. They search the World Wide Web in a systematic way for particular information specified in a textual web search query. The Search engine results page, search results are generally presented in a line of results, often referred to as search engine results pages (SERPs). When a user enters a query into a search engine, the engine scans its Search engine indexing, index of web pages to find those that are relevant to the user's query. The results are then ranked by relevancy and displayed to the user. The information may be a mix of links to web pages, images, videos, infographics, articles, research papers, and other types of files. Some search engines also data mining, mine data available in databases or open directories. Unlike web directories and social bookmarking, social bookmarking sites, which are maintained by human editors, search engines also maintain real-time computing, real-tim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Information Extraction
Information extraction (IE) is the task of automatically extracting structured information from unstructured and/or semi-structured machine-readable documents and other electronically represented sources. In most of the cases this activity concerns processing human language texts by means of natural language processing (NLP). Recent activities in multimedia document processing like automatic annotation and content extraction out of images/audio/video/documents could be seen as information extraction Due to the difficulty of the problem, current approaches to IE (as of 2010) focus on narrowly restricted domains. An example is the extraction from newswire reports of corporate mergers, such as denoted by the formal relation: :\mathrm(company_1, company_2, date), from an online news sentence such as: :''"Yesterday, New York based Foo Inc. announced their acquisition of Bar Corp."'' A broad goal of IE is to allow computation to be done on the previously unstructured data. A more sp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wikia Search
Wikia Search was a short-lived free and open-source web search engine launched by Wikia, a for-profit wiki-hosting company founded in late 2004 by Jimmy Wales and Angela Beesley. Wikia Search followed other experiments by Wikia into search engine technology and officially launched as a "public alpha" on January 7, 2008. The roll-out version of the search interface was widely criticized by reviewers in mainstream media. History On December 23, 2006, Wales made a passing comment regarding the possibility of a wiki-based internet search. The result was extensive media coverage in multiple languages, in outlets like ''The Guardian'', the ''Sydney Morning Herald'', and online editions of ''Forbes'' and ''Business Week'' publishing the statement as an announcement, encouraging the company to re-brand and relaunch its previous search engine proposal under the temporary name of "Search Wikia". In a later interview, Wales attempted to clarify several issues. He said that funding receiv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scalability
Scalability is the property of a system to handle a growing amount of work by adding resources to the system. In an economic context, a scalable business model implies that a company can increase sales given increased resources. For example, a package delivery system is scalable because more packages can be delivered by adding more delivery vehicles. However, if all packages had to first pass through a single warehouse for sorting, the system would not be as scalable, because one warehouse can handle only a limited number of packages. In computing, scalability is a characteristic of computers, networks, algorithms, networking protocols, programs and applications. An example is a search engine, which must support increasing numbers of users, and the number of topics it indexes. Webscale is a computer architectural approach that brings the capabilities of large-scale cloud computing companies into enterprise data centers. In mathematics, scalability mostly refers to closure u ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Web Crawler
A Web crawler, sometimes called a spider or spiderbot and often shortened to crawler, is an Internet bot that systematically browses the World Wide Web and that is typically operated by search engines for the purpose of Web indexing (''web spidering''). Web search engines and some other websites use Web crawling or spidering software to update their web content or indices of other sites' web content. Web crawlers copy pages for processing by a search engine, which indexes the downloaded pages so that users can search more efficiently. Crawlers consume resources on visited systems and often visit sites unprompted. Issues of schedule, load, and "politeness" come into play when large collections of pages are accessed. Mechanisms exist for public sites not wishing to be crawled to make this known to the crawling agent. For example, including a robots.txt file can request bots to index only parts of a website, or nothing at all. The number of Internet pages is extremely large; ev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
