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Distributed Web Crawling Over DHTs

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Executive Summary

In this paper, the authors present the design and implementation of a distributed web crawler. They begin by motivating the need for such a crawler, as a basic building block for decentralized web search applications. The distributed crawler harnesses the excess bandwidth and computing resources of clients to crawl the web. Nodes participating in the crawl use a Distributed Hash Table (DHT) to coordinate and distribute work. The authors study different crawl distribution strategies and investigate the trade-offs in communication overheads, crawl throughput, balancing load on the crawlers as well as crawl targets, and the ability to exploit network proximity.

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