{"id":429,"date":"2025-11-05T10:55:30","date_gmt":"2025-11-05T02:55:30","guid":{"rendered":"https:\/\/blog.libra5.cool\/?p=429"},"modified":"2025-11-05T10:55:30","modified_gmt":"2025-11-05T02:55:30","slug":"%e5%88%86%e5%b8%83%e5%bc%8f%e7%b3%bb%e7%bb%9f%e5%ad%a6%e4%b9%a0%e5%b0%8f%e8%ae%b014-cops%e7%b3%bb%e7%bb%9f%e4%b8%8e%e5%9b%a0%e6%9e%9c%e4%b8%80%e8%87%b4%e6%80%a7%ef%bc%88ca","status":"publish","type":"post","link":"https:\/\/blog.libra5.cool\/?p=429","title":{"rendered":"\u5206\u5e03\u5f0f\u7cfb\u7edf\u5b66\u4e60\u5c0f\u8bb014\u00a0\u2014\u2014\u00a0COPS\u7cfb\u7edf\u4e0e\u56e0\u679c\u4e00\u81f4\u6027\uff08Causal Consistency\uff09"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u201cHi\uff0c\u8fd9\u662f\u5c0f5\u81ea\u5b66\u7b97\u529b\u5927\u96c6\u7fa4\u76f8\u5173\u77e5\u8bc6\u7684\u7b2c14\u7bc7\u7b14\u8bb0\u3002\u8fd9\u6b21\u671f\u6211\u4eec\u5c06\u8ba8\u8bba\u6211\u4eec\u80fd\u5426\u6784\u5efa\u4e00\u4e2a\u7cfb\u7edf\uff0c\u4f7f\u5f97\u5199\u64cd\u4f5c\u4e5f\u80fd\u591f\u4ece\u5ba2\u6237\u7aef\u7684\u89c6\u89d2\u51fa\u53d1\uff0c\u7eaf\u7cb9\u5730\u4ee5\u672c\u5730\u65b9\u5f0f\u8fdb\u884c\u3002\u201d<\/p>\n<cite>\u6458\u8981<\/cite><\/blockquote>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>\u90a3\u4e9b\u62e5\u6709\u591a\u4e2a\u6570\u636e\u4e2d\u5fc3\u7684\u5927\u578b\u7f51\u7ad9\u4eec\uff0c\u5b83\u4eec\u5e0c\u671b\u5728\u6bcf\u4e2a\u6570\u636e\u4e2d\u5fc3\u90fd\u590d\u5236\u6240\u6709\u6570\u636e\uff0c\u8fd9\u65e2\u662f\u4e3a\u4e86\u5c06\u526f\u672c\u9760\u8fd1\u7528\u6237\uff0c\u4e5f\u53ef\u80fd\u662f\u4e3a\u4e86\u5bb9\u9519\u3002<\/p>\n\n\n\n<p>\u8003\u8651\u5230\u5ba2\u6237\u7aef\u901a\u5e38\u662f\u7f51\u7edc\u6d4f\u89c8\u5668\u7684\u573a\u666f\uff0c\u968f\u4e4b\u800c\u6765\u7684\u4fbf\u662f\u8981\u6c42\u5feb\u901f\u8bfb\u53d6\u3002\u5178\u578b\u7684\u5b89\u6392\u662f\uff0c\u8bfb\u53d6\u64cd\u4f5c\u81f3\u5c11\u5728\u672c\u5730\u8fdb\u884c\uff0c\u800c\u5199\u5165\u64cd\u4f5c\u53ef\u80fd\u7a0d\u5fae\u590d\u6742\u4e00\u4e9b\u3002\u7b26\u5408\u8fd9\u79cd\u6a21\u5f0f\u7684\u7cfb\u7edf\u4e4b\u4e00\u5c31\u662f\u4e4b\u524d\u4ecb\u7ecd\u8fc7\u7684 Spanner \uff0c\u800c Spanner \u53ca\u5176\u5199\u64cd\u4f5c\u6d89\u53ca\u8de8\u6240\u6709\u6570\u636e\u4e2d\u5fc3\u7684 Paxos \u7b97\u6cd5\u8fd0\u884c\u3002<\/p>\n\n\n\n<p>Facebook \u7684 Memcached \u662f\u8be5\u901a\u7528\u6a21\u5f0f\u4e0b\u7684\u53e6\u4e00\u79cd\u8bbe\u8ba1\u3002\u5176\u5b58\u5728\u4e00\u4e2a\u4e3b\u7ad9\u70b9\uff0c\u8be5\u7ad9\u70b9\u62e5\u6709\u4e00\u7ec4\u4e3b MySQL \u6570\u636e\u5e93\u3002\u6240\u4ee5\uff0c\u5982\u679c\u5ba2\u6237\u7aef\u60f3\u8981\u8fdb\u884c\u5199 \u64cd\u4f5c\u5b83\u5fc5\u987b\u5c06\u6240\u6709\u5199\u64cd\u4f5c\u53d1\u9001\u5230\u4e3b\u7ad9\u70b9\uff0c\u968f\u540e\u4e3b\u7ad9\u70b9\u5411\u5176\u4ed6\u6570\u636e\u4e2d\u5fc3\u53d1\u9001\u65b0\u7684\u4fe1\u606f\u6216\u65e0\u6548\u5316\u901a\u77e5\u3002\u56e0\u6b64\uff0c\u5199\u5165\u64cd\u4f5c\u5b9e\u9645\u4e0a\u6709\u4e9b\u6602\u8d35\uff0c\u4e0e Spanner 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Lamport \u65f6\u949f\u7684\u8fd9\u4e00\u6982\u5ff5\u3002 Lamport \u65f6\u949f\u662f\u4e00\u79cd\u5206\u914d\u65f6\u95f4\u6233\u7684\u65b9\u6cd5\uff0c\u8fd9\u4e9b\u65f6\u95f4\u6233\u4e0e\u5b9e\u9645\u65f6\u95f4\u6709\u5173\uff0c\u4f46\u80fd\u591f\u5e94\u5bf9\u67d0\u4e9b\u670d\u52a1\u5668\u65f6\u949f\u8fd0\u884c\u8fc7\u5feb\u7684\u95ee\u9898\u3002\u6bcf\u4e2a\u670d\u52a1\u5668\u90fd\u7ef4\u62a4\u4e00\u4e2a\u540d\u4e3a tmax \u7684\u503c\u3002\u8be5\u503c\u8868\u793a\u5b83\u4ece\u5176\u4ed6\u4efb\u4f55\u5730\u65b9\u8fc4\u4eca\u4e3a\u6b62\u6240\u89c1\u5230\u7684\u6700\u9ad8\u7248\u672c\u53f7\u3002\u5982\u679c\u6709\u4eba\u751f\u6210\u7684\u65f6\u6233\u8d85\u524d\u4e8e\u5b9e\u9645\u65f6\u95f4\uff0c\u6240\u6709\u770b\u5230\u8fd9\u4e9b\u65f6\u6233\u7684\u5176\u4ed6\u670d\u52a1\u5668\uff0c\u5b83\u4eec\u7684 tmax \u503c\u5c06\u4f1a\u53cd\u6620\u51fa\u8fd9\u4e00\u70b9\uff0c\u5373\u76f8\u5bf9\u4e8e\u5b9e\u9645\u65f6\u95f4\u6709\u6240\u8d85\u524d\u3002\u5f53\u670d\u52a1\u5668\u9700\u8981\u529e\u65b0\u7684\u5199\u5165\u5206\u914d\u65f6\u95f4\u6233\u6216\u7248\u672c\u53f7\u65f6\u3002\u5b83\u4f1a\u91c7\u7528\u7684\u65b9\u6cd5\u662f\u53d6 tmax \uff08\u5f53\u524d\u6700\u5927\u65f6\u95f4\u6233\uff09\u52a0\u4e00\uff0c\u4ee5\u53ca\u5b9e\u9645\u7684\u7cfb\u7edf\u65f6\u95f4\uff08\u5373\u5899\u949f\u65f6\u95f4\uff09\u4e2d\u7684\u6700\u5927\u503c\u3002\u5373\uff08Tmax+1\uff0creal 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class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>\u662f\u5173\u4e8e\u5e76\u53d1\u8bfb\u53d6\u540c\u4e00\u952e\u7684\u5904\u7406\u95ee\u9898<\/p>\n\n\n\n<p>\u5e76\u53d1\u8bfb\u53d6\u53ef\u80fd\u90fd\u643a\u5e26\u4e86\u5e94\u8be5\u4fdd\u7559\u7684\u91cd\u8981\u4fe1\u606f\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u4eec\u6709\u4e24\u4e2a\u6570\u636e\u4e2d\u5fc3\uff0c\u5206\u522b\u6709\u5ba2\u6237\u7aef1\u548c\u5ba2\u6237\u7aef2\u5b83\u4eec\u90fd\u5411\u540c\u4e00\u952e\u53d1\u51fa\u4e86\u5199\u5165\u8bf7\u6c42\u3002\u8fd9\u4e24\u4e2a put 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style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u6784\u5efa\u7cfb\u7edf2<\/strong><\/li>\n<\/ul>\n\n\n\n<p>\u6211\u4eec\u80fd\u5426\u6784\u5efa\u4e00\u4e2a\u7cfb\u7edf\uff0c\u5b83\u4ecd\u7136\u5141\u8bb8\u672c\u5730\u8bfb\u53d6\u548c\u672c\u5730\u5199\u5165\uff0c\u4f46\u53ef\u80fd\u7565\u5fae\u51cf\u5c11\u5f02\u5e38\u884c\u4e3a\uff1f<\/p>\n\n\n\n<p>\u5728\u6b64\u65b9\u6848\u4e2d\uff0c\u5c06\u63d0\u51fa\u4e00\u4e2a\u65b0\u64cd\u4f5c\u7b26\uff0c sync \u64cd\u4f5c\u7b26\u3002\u529f\u80fd\u662f\uff0c\u5f53\u5ba2\u6237\u7aef\u8c03\u7528\u5b83\u65f6\uff0c\u4f60\u9700\u8981\u63d0\u4f9b\u4e00\u4e2a\u952e\u548c\u4e00\u4e2a\u7248\u672c\u53f7\uff0c sync \u5c06\u7b49\u5f85\uff0c\u76f4\u81f3\u6240\u6709\u6570\u636e\u4e2d\u5fc3\u4e2d\u952e k 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style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>\u975e GT \u7248\u672c\uff08\u5373\u65e0 GET \u4e8b\u52a1\uff09\u7684 COPS \u7cfb\u7edf\u7684\u529f\u80fd\u4e0e\u4ecb\u7ecd<\/p>\n\n\n\n<p>COPS \u7684\u57fa\u672c\u7b56\u7565\u662f\uff0c\u5f53 COPS \u5ba2\u6237\u7aef\u8fdb\u884c\u672c\u5730\u8bfb\u5199\u64cd\u4f5c\u65f6\uff0c\u5b83\u4eec\u4f1a\u79ef\u7d2f\u5173\u4e8e\u64cd\u4f5c\u987a\u5e8f\u7684\u4fe1\u606f\uff0c\u6bd4\u65e5\u5fd7\u65b9\u6848\u7684\u7c92\u5ea6\u8981\u7a0d\u5fae\u7ec6\u4e00\u4e9b\u3002\u6bcf\u5f53\u5ba2\u6237\u7aef\u6267\u884c\u4e00\u4e2a put \u64cd\u4f5c\u65f6\uff0c\u8be5\u4fe1\u606f\u90fd\u4f1a\u88ab\u53d1\u9001\u5230\u8fdc\u7a0b\u6570\u636e\u4e2d\u5fc3\u3002\u8fd9\u91cc\u6211\u4eec\u9700\u8981\u5f15\u5165\u5ba2\u6237\u7aef\u4e0a\u4e0b\u6587(client context)\u7684\u6982\u5ff5\u3002<\/p>\n\n\n\n<p>\u5f53\u5ba2\u6237\u7aef\u8fdb\u884c get \u548c put \u64cd\u4f5c\u65f6\uff0c\u53ef\u80fd\u4e00\u4e2a\u5ba2\u6237\u7aef\u5148\u83b7\u53d6 X 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