{"id":87565,"date":"2020-05-10T00:20:52","date_gmt":"2020-05-09T16:20:52","guid":{"rendered":"http:\/\/4563.org\/?p=87565"},"modified":"2020-05-10T00:20:52","modified_gmt":"2020-05-09T16:20:52","slug":"%e5%9b%bd%e5%86%85%e5%9b%bd%e5%a4%96%e9%83%bd%e8%a6%81%e8%80%83%e7%9a%84%e7%b3%bb%e7%bb%9f%e8%ae%be%e8%ae%a1%e5%88%b0%e5%ba%95%e5%92%8b%e5%be%97%e5%88%86%ef%bc%9f","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=87565","title":{"rendered":"\u56fd\u5185\u56fd\u5916\u90fd\u8981\u8003\u7684\u7cfb\u7edf\u8bbe\u8ba1\u5230\u5e95\u548b\u5f97\u5206\uff1f"},"content":{"rendered":"
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\u56fd\u5185\u56fd\u5916\u90fd\u8981\u8003\u7684\u7cfb\u7edf\u8bbe\u8ba1\u5230\u5e95\u548b\u5f97\u5206\uff1f <\/h1>\n

<\/p>\n

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\u8cc7\u6df1\u5927\u4f6c : hakunamatata11 <\/span> <\/i> 7<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\u90fd\u8bf4\u7cfb\u7edf\u8bbe\u8ba1\u9762\u8bd5\u5c31\u662f\u8ba9\u4f60\u201c\u9020\u706b\u7bad\u201d\uff01<\/p>\n

\u6ca1\u9519\uff0c\u8bb8\u591a\u9762\u8bd5\u8005\u90fd\u6709\u79cd\u201c\u9ad8\u5c4b\u5efa\u74f4\u201d\u7684\u611f\u89c9\u3002\u5f80\u5f80\u770b\u5b8c\u7f51\u4e0a\u641c\u7684\u8d44\u6599\uff0c\u8111\u5b50\u66f4\u4e0d\u6e05\u695a\u4e86\uff0c\u53ea\u80fd\u54c0\u568e\uff1a\u89c1\u4e86\u9b3c\u7684\uff0c\u8c01\u80fd\u544a\u8bc9\u6211\u5230\u5e95\u600e\u4e48\u7b54\u624d\u5f97\u5206\uff1f\uff01<\/strong><\/p>\n

\u4eca\u5929\u5c0f\u7f16\u5c31\u7528\u4e00\u9053 Facebook \u771f\u9898\u6765\u4e3e\u4f8b\uff1a<\/p>\n

Design a photo reference counting system at FB scale<\/strong><\/p>\n

\u4ee4\u72d0\u51b2\u8001\u5e08\u89e3\u7b54<\/strong><\/h2>\n

\u300a\u7cfb\u7edf\u8bbe\u8ba1\u300b\u300a\u4e5d\u7ae0\u7b97\u6cd5\u73ed\u300b\u4e3b\u8bb2\u8001\u5e08; FLAG \u8d44\u6df1\u5de5\u7a0b\u5e08<\/p>\n

\u8fd9\u4e2a\u9898\u662f\u6211\u4eec\u5728\u300a\u7cfb\u7edf\u8bbe\u8ba1\u73ed\u300b\u7b2c\u4e00\u8282\u8bfe\u8bb2\u8fc7\u7684\u5185\u5bb9\u3002<\/p>\n

\u9996\u5148\uff0c\u4f60\u5148\u4e0d\u8981\u66f2\u89e3\u9898\u76ee\uff0c\u4f60\u76f4\u63a5\u628a\u9898\u76ee\u7ffb\u8bd1\u4e3a\uff1a\u8bbe\u8ba1 distributed counting system\uff0c\u5c31\u5df2\u7ecf\u8d70\u504f\u4e86\u3002<\/p>\n

\u4ece\u8fd9\u9053\u9898\u7684\u9898\u9762\u6765\u770b\uff0c\u9762\u8bd5\u5b98\u53ea\u662f\u8981\u5bf9\u6bcf\u4e2a photo \u6709\u4e00\u4e2a counter<\/strong>\u3002\u8fd9\u4e2a counter \u5e72\u561b\u7684\u5462\uff1f\u4f60\u53ef\u4ee5\u7406\u89e3\u4e3a\u67d0\u4e2a photo \u88ab like \u7684\u6570\u76ee\u3002\u8fd9\u548c\u300a\u7cfb\u7edf\u8bbe\u8ba1\u73ed\u300b\u7b2c\u4e00\u8282 Design a Twitter \u91cc\u8bf4\u7684\uff0c\u67d0\u4e2a post \u88ab like\uff0c\u662f\u4e00\u6837\u7684\u3002<\/p>\n

\u5728\u8fd9\u9053\u9898\u4e2d\uff0c\u9762\u8bd5\u5b98\u4e3b\u8981\u8003\u6838\u4f60\u4ee5\u4e0b\u51e0\u4e2a\u5c42\u9762\u7684\u4e1c\u897f\uff1a<\/p>\n

[\u7b2c\u4e00\u5c42]<\/p>\n

\u4f60\u9996\u5148\u8981\u77e5\u9053\u662f\u7528 denormailze \u7684\u65b9\u6cd5\uff0c\u548c photo \u4e00\u8d77\u5b58\u5728\u4e00\u8d77\uff0c\u8fd9\u6837\u4e0d\u7528\u53bb\u6570\u636e\u5e93\u91cc\u6570 like \u3002\u6240\u4ee5\u53ef\u80fd\u8003\u5bdf\u7684\u5c31\u662f\uff0c\u6570\u636e\u5e93\u7684\u5b58\u653e\u65b9\u6cd5<\/strong>\uff0c\u670d\u52a1\u5668\u7aef\u7528 memcached \u6216\u8005\u4efb\u4f55 cache \u53bb\u5b58\u50a8\uff0c\u8bbf\u95ee\u90fd\u662f\u627e cache\uff0c\u5b9e\u5728\u662f\u592a\u5927\u7684\u6570\u636e\u91cf\uff0c\u624d\u4f1a\u8003\u8651\u5206\u5e03\u5f0f\u3002<\/p>\n

+1 \u5206<\/p>\n

[\u7b2c\u4e8c\u5c42]<\/p>\n

\u4f60\u77e5\u9053\u8fd9\u73a9\u610f\u513f\u4e0d\u80fd\u6bcf\u6b21\u53bb\u6570\u636e\u5e93\u67e5\uff0c\u5f97cache<\/strong>\u3002<\/p>\n

+0.5 \u5206<\/p>\n

[\u7b2c\u4e09\u5c42]<\/p>\n

\u8fd9\u73a9\u610f\u513f\u4e00\u76f4\u5728\u66f4\u65b0\uff0c\u88ab\u5199\u5f88\u591a\u6b21\uff0c\u4f60\u77e5\u9053\u5fc5\u987b\u4e00\u76f4\u4fdd\u6301\u8fd9\u4e2a\u6570\u636e\u5728 cache \u91cc\uff0c\u4e0d\u80fd invalidate<\/strong>\u3002<\/p>\n

+0.5 \u5206<\/p>\n

[\u7b2c\u56db\u5c42]<\/p>\n

\u4f60\u77e5\u9053\u600e\u4e48\u8ba9\u6570\u636e\u5e93\u548c cache \u4fdd\u6301\u4e00\u81f4\u6027<\/p>\n

+2 \u5206<\/p>\n

[\u7b2c\u4e94\u5c42]<\/p>\n

\u4f60\u77e5\u9053 cache \u91cc\u5982\u679c\u6ca1\u6709\u4e86\uff0c\u600e\u4e48\u907f\u514d\u6570\u636e\u5e93\u88ab\u51b2\u57ae<\/strong>\uff08 memcache lease get)<\/p>\n

+2 \u5206<\/p>\n

[\u7b2c\u516d\u5c42]<\/p>\n

\u4e00\u4e2a\u5c0f\u7684\u4f18\u5316\uff0c\u5982\u679c\u8fd9\u4e2a\u6570\u636e\u5f88 hot\uff0c\u53ef\u4ee5\u5728 server \u5185\u90e8\u5f00\u4e00\u4e2a\u5c0f cache\uff0c\u53ea\u5b58\u53ca\u5176 hot \u7684\u6570\u636e\u3002<\/p>\n

+2 \u5206<\/p>\n

\u4ee5\u4e0a\uff0c\u770b\u5b8c\u540e\u4f60\u662f\u4e00\u8138\u61f5\u903c<\/p>\n

\u8fd8\u662f\u8305\u585e\u987f\u5f00\u3001\u601d\u8def\u6e05\u6670\uff1f<\/p>\n

\u901a\u5e38\u9762\u8bd5\u8005\u4f1a\u9047\u5230\u7684\u5171\u6027\u95ee\u9898\u6709 <\/p><\/div>\n

\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (8<\/span>) <\/div>\n
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    \u8cc7\u6df1\u5927\u4f6c : gemini767 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u573a\u666f\u65b9\u6848\u770b\u5b8c\u4e86\uff0c\u6ee1\u5206\u662f 100 \u5206\u4e48\uff1f\u8fd9\u8bbe\u8ba1\u662f\u8ba4\u771f\u7684\u4e48\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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    \u8cc7\u6df1\u5927\u4f6c : Senventise <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6570\u5b66 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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    \u8cc7\u6df1\u5927\u4f6c : Senventise <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @Senventise sorry\uff0c\u624b\u6ed1\u4e86 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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    \u8cc7\u6df1\u5927\u4f6c : PureWhiteWu <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u60f3\u95ee\u4e00\u4e0b\uff0cdenormailze \u662f\u5565\u610f\u601d\uff1f[doge] <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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    \u8cc7\u6df1\u5927\u4f6c : Zhuzhuchenyan <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @PureWhiteWu \u8fd9\u4e2a\u9996\u5148\u770b\u4ec0\u4e48\u662f normailze\uff0c\u4e00\u822c\u5c31\u662f\u6211\u4eec\u6240\u8bf4\u7684\u6570\u636e\u5e93\u8303\u5f0f 1NF\uff0c2NF\uff0c3NF\uff0cBCNF\uff0c\u4e00\u6b65\u4e00\u6b65\u4e0a\u5347\u7684\u8fc7\u7a0b\u5176\u5b9e\u5c31\u662f normalize \u7684\u8fc7\u7a0b
    \u8fd9\u91cc\u53ef\u80fd\uff08\u6211\u7684\u731c\u6d4b\uff09\u4f1a\u6307\u7684\u662f\uff0c\u5982\u679c\u975e\u5e38\u8ffd\u6c42 normalize \u7a0b\u5ea6\uff0cphoto \u81ea\u5df1\u4e00\u5f20\u8868\uff0cphoto \u7684 like \u5b58\u4e00\u5f20\u8868\uff0c\u4e24\u8005\u901a\u8fc7 photo \u7684\u8868\u7684\u4e3b\u952e\u8fdb\u884c\u8fde\u63a5\uff0c\u5728\u67e5\u627e\u7684\u65f6\u5019\u901a\u8fc7 join \u627e\u5230\u5bf9\u5e94\u7684 photo \u7684 like \u4e2a\u6570
    \u7136\u540e\u6240\u8c13\u7684 denormalize \u5c31\u628a photo \u7684 like \u76f4\u63a5\u5b58\u5728 photo \u7684\u8868\u91cc\u53bb\u4e86\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u51cf\u5c11\u6570\u636e\u5e93\u5c42\u9762\u4e0a\u7684\u67e5\u8be2\u5f00\u9500 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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    \u8cc7\u6df1\u5927\u4f6c : PureWhiteWu <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @Zhuzhuchenyan normalize \u6211\u77e5\u9053\u5565\u610f\u601d\uff0cdenormalize \u6211\u4e5f\u77e5\u9053\u5565\u610f\u601d\uff0cdenormailze \u6211\u5c31\u4e0d\u8ba4\u8bc6\u4e86\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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    \u8cc7\u6df1\u5927\u4f6c : Zhuzhuchenyan <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @PureWhiteWu \u54c8\u54c8\uff0c\u90a3\u53ef\u80fd\u662f\u795e\u5947\u7684\u6253\u9519\u4e86 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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    \u8cc7\u6df1\u5927\u4f6c : swulling <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u7b2c\u516d\u5c42\u5c31\u6ee1\u5206\u4e86\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"

    \u56fd\u5185\u56fd\u5916\u90fd\u8981\u8003\u7684\u7cfb\u7edf\u8bbe\u8ba1\u5230\u5e95\u548b\u5f97\u5206…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/87565"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=87565"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/87565\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=87565"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=87565"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=87565"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}