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Multicasting a changing repository

机译:多播更改的存储库

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摘要

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.
机译:Web搜寻器在Web服务器上产生大量负载,并且难以操作。我们提议在中央爬网程序和Web存储库中多播中央存储库的适当子集及其后续更改,以便订阅客户端,而不是在许多“客户端”站点上重复运行搜寻器。 Web服务器的负载减少了,因为与所有客户端搜寻器相比,单个搜寻器访问了服务器。我们为订户客户端以及订户和一次性下载客户端的混合模型和评估这样的中央Web多播功能。我们针对这种组播工具考虑不同的性能指标和组播算法,并针对各种条件制定其设计准则。

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