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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
          n more than once. Typically, avoidance is achieved by maintaining a set of discovered URLs, covering the URLs in the frontier as well as those that have already been downloaded. If this set is too large to fit in memory (which it often is, given that there are billions of valid URLs), it is stored on disk and caching popular URLs in memory is a win: Caching allows the crawler to discard a large fraction of the URLs without having to consult the disk-based set.
          Many of the distributed web crawlers described above, namely Mercator [29], WebFountain [16], UbiCrawler[4], and Cho and Molina’s crawler [13], are prised of cooperating crawling processes, each of which downloads web pages, extracts their links, and sends these links to the peer crawling process responsible for it. However, there is no need to send a URL to a peer crawling process more than once.
          Maintaining a cache of URLs and consulting that cache before sending a URL to a peer crawler goes a long way toward reducing tran**issions to peer crawlers, as we show in the remainder of this paper.
          3. CACHING
          In most puter systems, memory is hierarchical, that is, there exist two or more levels of memory, representing different tra
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