A survey of Web crawlers for information retrieval

Overview

Manish Kumar, Rajesh Bhatia, Dhavleesh Rattan

Published Online: Aug 07 2017

DOI: 10.1002/widm.1218

Full article on Wiley Online Library: HTML PDF

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Performance of any search engine relies heavily on its Web crawler. Web crawlers are the programs that get webpages from the Web by following hyperlinks. These webpages are indexed by a search engine and can be retrieved by a user query. In the area of Web crawling, we still lack an exhaustive study that covers all crawling techniques. This study follows the guidelines of systematic literature review and applies it to the field of Web crawling. We used the standard procedure of carrying out a systematic literature review on 248 studies from a total of 1488 articles published in 12 leading journals and other premier conferences and workshops. Existing literature about the Web crawler is classified into different key subareas. Each subarea is further divided according to the techniques being used. We analyzed the distribution of various articles using multiple criteria and depicted conclusions. Various studies that use open source Web crawlers are also reported. We have highlighted future areas of research. We call for an increased awareness in various fields of the Web crawler and identify how techniques from other domains can be used for crawling the Web. Limitations and recommendations for future are also discussed.

Architecture of a Web crawler.

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Implementation language used by various studies.

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Different techniques used by various categories of focused crawler.

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A taxonomy of Web crawler.

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