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The concepts of topical and focused crawling were first introduced by Filippo Menczer [20] [21] and by Soumen Chakrabarti et al. [22] The main problem in focused crawling is that in the context of a Web crawler, we would like to be able to predict the similarity of the text of a given page to the query before actually downloading the page.
Heritrix is a web crawler designed for web archiving.It was written by the Internet Archive.It is available under a free software license and written in Java.The main interface is accessible using a web browser, and there is a command-line tool that can optionally be used to initiate crawls.
Distributed web crawling is a distributed computing technique whereby Internet search engines employ many computers to index the Internet via web crawling. Such systems may allow for users to voluntarily offer their own computing and bandwidth resources towards crawling web pages.
In addition, ontologies can be automatically updated in the crawling process. Dong et al. [15] introduced such an ontology-learning-based crawler using support vector machine to update the content of ontological concepts when crawling Web Pages. Crawlers are also focused on page properties other than topics.
A crawl frontier is a data structure used for storage of URLs eligible for crawling and supporting such operations as adding URLs and selecting for crawl. Sometimes it can be seen as a priority queue .
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The organization began releasing metadata files and the text output of the crawlers alongside .arc files in July 2012. [10] Common Crawl's archives had only included .arc files previously. [10] In December 2012, blekko donated to Common Crawl search engine metadata blekko had gathered from crawls it conducted from February to October 2012. [11]