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              Python面試真題- scrapy和scrapy-redis有什么區別?為什么選擇redis數據庫?

              【Python面試真題】- scrapy和scrapy-redis有什么區別?為什么選擇redis數據庫?

                1) scrapy是一個Python爬蟲框架,爬取效率極高,具有高度定制性,但是不支持分布式。而scrapy-redis一套基于redis數據庫、運行在scrapy框架之上的組件,可以讓scrapy支持分布式策略,Slaver端共享Master端redis數據庫里的item隊列、請求隊列和請求指紋集合。

                2) 為什么選擇redis數據庫,因為redis支持主從同步,而且數據都是緩存在內存中的,所以基于redis的分布式爬蟲,對請求和數據的高頻讀取效率非常高。



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