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Web Crawlers: Design and Techniques by Gabriel Fernandes is a document available to read on EtoBox.

What is Web Crawlers: Design and Techniques about?

This document summarizes the basic design of web crawlers as discussed in the paper "Mercator: A Scalable, Exensible Web Crawler" by Allan Heydon and Marc Najork. It describes how crawlers maintain a URL frontier using a breadth-first approach with multiple subqueues, respect robots.txt policies, leverage caching of DNS lookups and page content using hashes to detect duplicates, and store hashed URLs in sorted form to check which have already been crawled. The goal is to efficiently crawl the web at scale w

Author

Gabriel Fernandes

Language

EN