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Multicasting a changing repository

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2 Author(s)
Lam, W. ; Dept. of Comput. Sci., Stanford Univ., CA, USA ; Garcia-Molina, H.

Web crawlers generate significant loads on Web servers, and are difficult to operate. Instead of repeatedly running crawlers at many "client" sites, we propose a central crawler and Web repository that multicasts appropriate subsets of the central repository, and their subsequent changes, to subscribing clients. Loads at Web servers are reduced because a single crawler visits the servers, as opposed to all the client crawlers. We model and evaluate such a central Web multicast facility for subscriber clients, and for mixes of subscriber and one-time down-loader clients. We consider different performance metrics and multicast algorithms for such a multicast facility, and develop guidelines for its design under various conditions.

Published in:

Data Engineering, 2003. Proceedings. 19th International Conference on

Date of Conference:

5-8 March 2003

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