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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
          s not responsible, sends this URL to a dedicated process (the “controller”), which forwards the URL to the appropriate ant.
          UbiCrawler (formerly known as Trovatore) [4, 5] is again posed of multiple independent, municating web crawler processes. It also employs a controller process which oversees the crawling processes, detects process failures, and initiates fail-over to other crawling processes.
          Shkapenyuk and Suel’s crawler [35] is similar to Google’s; the different crawler ponents are implemented as different processes. A “crawling application” maintains the set of URLs to be downloaded, and schedules the order in which to download them. It sends download requests to a “crawl manager”, which forwards them to a pool of “downloader” processes. The downloader processes fetch the pages and save them to an NFS-mounted file system. The crawling application reads those saved pages, extracts any links contained within them, and adds them to the set of URLs to be downloaded.
          Any web crawler must maintain a collection of URLs that are to be downloaded. Moreover, since it would be unacceptable to download the same URL over and over, it must have a way to avoid adding URLs to the collectio
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