Lazy Preservation, Warrick, and the Web Infrastructure

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Presentation transcript:

Lazy Preservation, Warrick, and the Web Infrastructure Frank McCown Old Dominion University Computer Science Department Norfolk, Virginia, USA Internet Archive Tutorial JCDL 2007 Vancouver, BC June 19, 2007

Available at http://warrick.cs.odu.edu/ McCown, et al., Brass: A Queueing Manager for Warrick, IWAW 2007. McCown, et al., Factors Affecting Website Reconstruction from the Web Infrastructure, ACM IEEE JCDL 2007. McCown and Nelson, Evaluation of Crawling Policies for a Web-Repository Crawler, HYPERTEXT 2006. McCown, et al., Lazy Preservation: Reconstructing Websites by Crawling the Crawlers, ACM WIDM 2006. Available at http://warrick.cs.odu.edu/

What Types of Websites Are Lost? Marshall, McCown, and Nelson, Evaluating Personal Archiving Strategies for Internet-based Information, IS&T Archiving 2007.

Success of website recovery each week *On average, we recovered 61% of a website on any given week.

Overlap with Internet Archive Overall, IA contained only 46% of the resources available in SE caches

Web Server Recoverable Not Recoverable Static files (html files, PDFs, images, style sheets, Javascript, etc.) Web Infrastructure Recoverable config Perl script Dynamic page Database Not Recoverable

Injecting Server Components into Crawlable Pages Erasure codes HTML pages Recover at least m blocks