Nutch
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Screenshot  Nutch Web Interface Search | |
| Developer(s) | Apache Software Foundation |
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| Stable release | 1.5.1 and 2.1 / October 5, 2012 |
| Development status | Active |
| Written in | Java |
| Operating system | Cross-platform |
| Type | Search Engine |
| License | Apache License 2.0 |
| Website | nutch.apache.org |
Nutch is an effort to build an open source web search engine based on Lucene and Java for the search and index component.
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 multimachine 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 Lucene in June of that same year. Since April, 2010, Nutch has been considered an independent, top level project of the Apache Software Foundation.[1]
Advantages
Advantages of Nutch over a simple fetcher include[2]
- highly scalable and relatively feature rich crawler
- features like politeness which obeys robots.txt rules
- robust and scalable - Nutch can run on a cluster of up to 100 machines
- quality - crawling can be biased to fetch "important" pages first
Scalability
IBM Research studied the performance[3] of Nutch/Lucene as part of its Commercial Scale Out (CSO) project.[4] Their findings were that a scale-out system, such as Nutch/Lucene, could achieve a performance level on a cluster of blades that was not achievable on any scale-up computer such as the Power5.
The ClueWeb09 dataset (used in e.g. TREC) was gathered using Nutch, with an average speed of 755.31 documents per second.[5]
Related projects
- Hadoop - Java framework that supports distributed applications running on large clusters
Search engines built with Nutch
- Creative Commons Search - launched 2004, Nutch implementation replaced 2006[6][7][8]
- DiscoverEd - Open educational resources search prototype developed by Creative Commons
- Krugle uses Nutch to crawl web pages for code, archives and technically interesting content.
- mozDex (inactive)
- Wikia Search - launched 2008, closed down 2009[9][10]
See also
- Faceted Search
- Information Extraction
- Enterprise Search
References
- ↑ Nutch News
- ↑ Using Nutch with Solr
- ↑ Scalability of the Nutch search engine
- ↑ Base Operating System Provisioning and Bringup for a Commercial Supercomputer
- ↑ The Sapphire Web Crawler - Crawl Statistics. Boston.lti.cs.cmu.edu (2008-10-01). Retrieved on 2013-07-21.
- ↑ "Our Updated Search". Creative Commons. 2004-09-03.
- ↑ "Creative Commons Unique Search Tool Now Integrated into Firefox 1.0". Creative Commons. 2004-11-22.
- ↑ "New CC search UI". Creative Commons. 2006-08-02.
- ↑ Where can I get the source code for Wikia Search?
- ↑ Update on Wikia – doing more of what’s working
Bibliography
- Shoberg, J (October 26, 2006). Building Search Applications with Lucene and Nutch (1st ed.). Apress. p. 350. ISBN 978-1-59059-687-6.
External links
- Official website
- Official wiki
- Building Nutch: Open Source Search（2004）- ACM Queue vol. 2, no. 2
- An article about Nutch（2003）- Search Engine Watch
- Another article about Nutch（2003）- Tech News World
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