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          淺論外文翻譯___基于網絡爬蟲的有效URL緩存

          導讀:外文翻譯---基于網絡爬蟲的有效URL緩存
          Search (BFS) – they are easy to implement and taught in many introductory algorithms classes. (See for instance [34]).
          However, crawling the web is not a trivial programming exercise but a serious
          algorithmic and system design challenge because of the following two factors.
          1. The web is very large. Currently, Google [20] claims to have indexed over 3 billion pages. Various studies [3, 27, 28] have indicated that, historically, the web has doubled every 9-12 months.
          2. Web pages are changing rapidly. If “change” means “any change”, then about 40% of all web pages change weekly [12]. Even if we consider only pages that change by a third or more, about 7% of all web pages change weekly [17].
          These two factors imply that to obtain a reasonably fresh and 679 plete snapshot of the web, a search engine must crawl at least 100 million pages per day. Therefore, step (a) must be executed about 1,000 times per second, and the membership test in step (c) must be done well over ten thousand times per second, against a set of URLs that is too large to store in main memory. In addition, crawlers typically use a distributed architecture to crawl more pages in parallel, which further plicates the m
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