{"id":380,"date":"2022-04-24T09:03:04","date_gmt":"2022-04-24T01:03:04","guid":{"rendered":"https:\/\/blog.lijiajia.top\/?p=380"},"modified":"2026-06-19T21:02:23","modified_gmt":"2026-06-19T13:02:23","slug":"%e4%bb%80%e4%b9%88%e6%98%afcap%e7%90%86%e8%ae%ba","status":"publish","type":"post","link":"https:\/\/blog.ttwow.top\/?p=380","title":{"rendered":"\u4ec0\u4e48\u662fCAP\u7406\u8bba"},"content":{"rendered":"

https:\/\/zhuanlan.zhihu.com\/p\/50990721<\/a><\/p>\n

CAP\u5373\uff1a<\/h2>\n

Consistency\uff08\u4e00\u81f4\u6027\uff09
\nAvailability\uff08\u53ef\u7528\u6027\uff09
\nPartition tolerance\uff08\u5206\u533a\u5bb9\u5fcd\u6027\uff09
\n\u8fd9\u4e09\u4e2a\u6027\u8d28\u5bf9\u5e94\u4e86\u5206\u5e03\u5f0f\u7cfb\u7edf\u7684\u4e09\u4e2a\u6307\u6807\uff1a
\n\u800cCAP\u7406\u8bba\u8bf4\u7684\u5c31\u662f\uff1a\u4e00\u4e2a\u5206\u5e03\u5f0f\u7cfb\u7edf\uff0c\u4e0d\u53ef\u80fd\u540c\u65f6\u505a\u5230\u8fd9\u4e09\u70b9\u3002\u5982\u4e0b\u56fe\uff1a<\/p>\n

\u63a5\u4e0b\u6765\u5c06\u8be6\u7ec6\u4ecb\u7ecdC A P \u4e09\u4e2a\u6307\u6807\u7684\u542b\u4e49\uff0c\u4ee5\u53ca\u4e09\u8005\u5982\u4f55\u6743\u8861\u3002<\/p>\n

\u4e8c \u3001 C\u3001 A\u3001P\u7684\u542b\u4e49<\/h2>\n

\u501f\u7528\u4e00\u4e0b\u7ef4\u57fa\u767e\u79d1CAP\u7406\u8bba\u4e00\u6587\u4e2d\u5173\u4e8eC\u3001A\u3001P\u4e09\u8005\u7684\u5b9a\u4e49\u3002<\/p>\n

Consistency : Every read receives the most recent write or an error
\nAvailability : Every request receives a (non-error) response \u2013 without the guarantee that it contains the most recent write
\nPartition tolerance : The system continues to operate despite an arbitrary number of messages being dropped (or delayed) by the network between nodes
\n\u7ffb\u8bd1\u4e00\u4e0b\u5c31\u662f\uff1a
\n\u2460\u4e00\u81f4\u6027\uff1a\u5bf9\u4e8e\u5ba2\u6237\u7aef\u7684\u6bcf\u6b21\u8bfb\u64cd\u4f5c\uff0c\u8981\u4e48\u8bfb\u5230\u7684\u662f\u6700\u65b0\u7684\u6570\u636e\uff0c\u8981\u4e48\u8bfb\u53d6\u5931\u8d25\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u4e00\u81f4\u6027\u662f\u7ad9\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u7684\u89d2\u5ea6\uff0c\u5bf9\u8bbf\u95ee\u672c\u7cfb\u7edf\u7684\u5ba2\u6237\u7aef\u7684\u4e00\u79cd\u627f\u8bfa\uff1a\u8981\u4e48\u6211\u7ed9\u60a8\u8fd4\u56de\u4e00\u4e2a\u9519\u8bef\uff0c\u8981\u4e48\u6211\u7ed9\u4f60\u8fd4\u56de\u7edd\u5bf9\u4e00\u81f4\u7684\u6700\u65b0\u6570\u636e\uff0c\u4e0d\u96be\u770b\u51fa\uff0c\u5176\u5f3a\u8c03\u7684\u662f\u6570\u636e\u6b63\u786e\u3002<\/p>\n

\u2461\u53ef\u7528\u6027\uff1a\u4efb\u4f55\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u90fd\u80fd\u5f97\u5230\u54cd\u5e94\u6570\u636e\uff0c\u4e0d\u4f1a\u51fa\u73b0\u54cd\u5e94\u9519\u8bef\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u53ef\u7528\u6027\u662f\u7ad9\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u7684\u89d2\u5ea6\uff0c\u5bf9\u8bbf\u95ee\u672c\u7cfb\u7edf\u7684\u5ba2\u6237\u7684\u53e6\u4e00\u79cd\u627f\u8bfa\uff1a\u6211\u4e00\u5b9a\u4f1a\u7ed9\u60a8\u8fd4\u56de\u6570\u636e\uff0c\u4e0d\u4f1a\u7ed9\u4f60\u8fd4\u56de\u9519\u8bef\uff0c\u4f46\u4e0d\u4fdd\u8bc1\u6570\u636e\u6700\u65b0\uff0c\u5f3a\u8c03\u7684\u662f\u4e0d\u51fa\u9519\u3002<\/p>\n

\u2462\u5206\u533a\u5bb9\u5fcd\u6027\uff1a\u7531\u4e8e\u5206\u5e03\u5f0f\u7cfb\u7edf\u901a\u8fc7\u7f51\u7edc\u8fdb\u884c\u901a\u4fe1\uff0c\u7f51\u7edc\u662f\u4e0d\u53ef\u9760\u7684\u3002\u5f53\u4efb\u610f\u6570\u91cf\u7684\u6d88\u606f\u4e22\u5931\u6216\u5ef6\u8fdf\u5230\u8fbe\u65f6\uff0c\u7cfb\u7edf\u4ecd\u4f1a\u7ee7\u7eed\u63d0\u4f9b\u670d\u52a1\uff0c\u4e0d\u4f1a\u6302\u6389\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u5206\u533a\u5bb9\u5fcd\u6027\u662f\u7ad9\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u7684\u89d2\u5ea6\uff0c\u5bf9\u8bbf\u95ee\u672c\u7cfb\u7edf\u7684\u5ba2\u6237\u7aef\u7684\u518d\u4e00\u79cd\u627f\u8bfa\uff1a\u6211\u4f1a\u4e00\u76f4\u8fd0\u884c\uff0c\u4e0d\u7ba1\u6211\u7684\u5185\u90e8\u51fa\u73b0\u4f55\u79cd\u6570\u636e\u540c\u6b65\u95ee\u9898\uff0c\u5f3a\u8c03\u7684\u662f\u4e0d\u6302\u6389\u3002<\/p>\n

\u4e09\u3001\u6743\u8861 C\u3001A<\/h2>\n

\u4e4b\u524d\u63d0\u5230,CAP\u7406\u8bba\u8bf4\u4e00\u4e2a\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e0d\u53ef\u80fd\u540c\u65f6\u6ee1\u8db3C\u3001A\u3001P\u8fd9\u4e09\u4e2a\u7279\u6027\u3002\u90a3\u4e48\u6211\u4eec\u5c31\u6765\u5206\u6790C\u3001A\u3001P\u7684\u6743\u8861\u5427\u3002<\/p>\n

note\uff1a\u5176\u5b9e\u8fd9\u91cc\u6709\u4e2a\u5173\u4e8eCAP\u7406\u8bba\u7406\u89e3\u7684\u8bef\u533a\u3002\u4e0d\u8981\u4ee5\u4e3a\u5728\u6240\u6709\u65f6\u5019\u90fd\u53ea\u80fd\u9009\u62e9\u4e24\u4e2a\u7279\u6027\u3002\u5728\u4e0d\u5b58\u5728\u7f51\u7edc\u5931\u8d25\u7684\u60c5\u51b5\u4e0b\uff08\u5206\u5e03\u5f0f\u7cfb\u7edf\u6b63\u5e38\u8fd0\u884c\u65f6\uff09\uff0cC\u548cA\u80fd\u591f\u540c\u65f6\u4fdd\u8bc1\u3002\u53ea\u6709\u5f53\u7f51\u7edc\u53d1\u751f\u5206\u533a\u6216\u5931\u8d25\u65f6\uff0c\u624d\u4f1a\u5728C\u548cA\u4e4b\u95f4\u505a\u51fa\u9009\u62e9\u3002
\n\u5bf9\u4e8e\u4e00\u4e2a\u5206\u5e03\u5f0f\u7cfb\u7edf\u800c\u8a00\uff0cP\u662f\u524d\u63d0\uff0c\u5fc5\u987b\u4fdd\u8bc1\uff0c\u56e0\u4e3a\u53ea\u8981\u6709\u7f51\u7edc\u4ea4\u4e92\u5c31\u4e00\u5b9a\u4f1a\u6709\u5ef6\u8fdf\u548c\u6570\u636e\u4e22\u5931\uff0c\u8fd9\u79cd\u72b6\u51b5\u6211\u4eec\u5fc5\u987b\u63a5\u53d7\uff0c\u5fc5\u987b\u4fdd\u8bc1\u7cfb\u7edf\u4e0d\u80fd\u6302\u6389\u3002\u6240\u4ee5\u53ea\u5269\u4e0bC\u3001A\u53ef\u4ee5\u9009\u62e9\u3002\u8981\u4e48\u4fdd\u8bc1\u6570\u636e\u4e00\u81f4\u6027\uff08\u4fdd\u8bc1\u6570\u636e\u7edd\u5bf9\u6b63\u786e\uff09\uff0c\u8981\u4e48\u4fdd\u8bc1\u53ef\u7528\u6027\uff08\u4fdd\u8bc1\u7cfb\u7edf\u4e0d\u51fa\u9519\uff09\u3002<\/p>\n

\u5f53\u9009\u62e9\u4e86C\uff08\u4e00\u81f4\u6027\uff09\u65f6\uff0c\u5982\u679c\u7531\u4e8e\u7f51\u7edc\u5206\u533a\u800c\u65e0\u6cd5\u4fdd\u8bc1\u7279\u5b9a\u4fe1\u606f\u662f\u6700\u65b0\u7684\uff0c\u5219\u7cfb\u7edf\u5c06\u8fd4\u56de\u9519\u8bef\u6216\u8d85\u65f6\u3002<\/p>\n

\u5f53\u9009\u62e9\u4e86A\uff08\u53ef\u7528\u6027\uff09\u65f6\uff0c\u7cfb\u7edf\u5c06\u59cb\u7ec8\u5904\u7406\u5ba2\u6237\u7aef\u7684\u67e5\u8be2\u5e76\u5c1d\u8bd5\u8fd4\u56de\u6700\u65b0\u7684\u53ef\u7528\u7684\u4fe1\u606f\u7248\u672c\uff0c\u5373\u4f7f\u7531\u4e8e\u7f51\u7edc\u5206\u533a\u800c\u65e0\u6cd5\u4fdd\u8bc1\u5176\u662f\u6700\u65b0\u7684\u3002<\/p>\n

\u56db\u3001C\u3001A\u3001P\u4e09\u8005\u4e4b\u95f4\u7684\u51b2\u7a81<\/h2>\n

\u672c\u90e8\u5206\u4e3b\u8981\u53c2\u8003\u5206\u5e03\u5f0fCAP\u5b9a\u7406\uff0c\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u540c\u65f6\u6ee1\u8db3\u4e09\u4e2a\u7279\u6027\uff1f<\/p>\n

\u5047\u8bbe\u6709\u4e24\u53f0\u670d\u52a1\u5668\uff0c\u4e00\u53f0\u653e\u7740\u5e94\u7528A\u548c\u6570\u636e\u5e93V\uff0c\u4e00\u53f0\u653e\u7740\u5e94\u7528B\u548c\u6570\u636e\u5e93V\uff0c\u4ed6\u4eec\u4e4b\u95f4\u7684\u7f51\u7edc\u53ef\u4ee5\u4e92\u901a\uff0c\u4e5f\u5c31\u76f8\u5f53\u4e8e\u5206\u5e03\u5f0f\u7cfb\u7edf\u7684\u4e24\u4e2a\u90e8\u5206\u3002<\/p>\n

\u5728\u6ee1\u8db3\u4e00\u81f4\u6027\u7684\u65f6\u5019\uff0c\u4e24\u53f0\u670d\u52a1\u5668(\u5047\u8bbe\u4e3aN1,N2)\u7684\u6570\u636e\u662f\u4e00\u6837\u7684\uff0cDB0=DB0\u3002\u5728\u6ee1\u8db3\u53ef\u7528\u6027\u7684\u65f6\u5019\uff0c\u7528\u6237\u4e0d\u7ba1\u662f\u8bf7\u6c42N1\u6216\u8005N2\uff0c\u90fd\u4f1a\u5f97\u5230\u7acb\u5373\u54cd\u5e94\u3002\u5728\u6ee1\u8db3\u5206\u533a\u5bb9\u9519\u6027\u7684\u60c5\u51b5\u4e0b\uff0cN1\u548cN2\u6709\u4efb\u4f55\u4e00\u65b9\u5b95\u673a\uff0c\u6216\u8005\u7f51\u7edc\u4e0d\u901a\u7684\u65f6\u5019\uff0c\u90fd\u4e0d\u4f1a\u5f71\u54cdN1\u548cN2\u5f7c\u6b64\u4e4b\u95f4\u7684\u6b63\u5e38\u8fd0\u4f5c\u3002<\/p>\n

\u56fe1\u4e2d\uff0c\u7528\u6237\u901a\u8fc7N1\u4e2d\u7684A\u5e94\u7528\u8bf7\u6c42\u6570\u636e\u66f4\u65b0\u5230\u670d\u52a1\u5668DB0\uff0c\u8fd9\u65f6N1\u4e2d\u7684\u670d\u52a1\u5668DB0\u53d8\u4e3aDB1\uff0c\u901a\u8fc7\u5206\u5e03\u5f0f\u7cfb\u7edf\u7684\u6570\u636e\u540c\u6b65\u66f4\u65b0\u64cd\u4f5c\uff0cN2\u670d\u52a1\u5668\u4e2d\u7684\u6570\u636e\u5e93V0\u4e5f\u66f4\u65b0\u4e3a\u4e86DB1\uff08\u56fe2\uff09\uff0c\u8fd9\u65f6\uff0c\u7528\u6237\u901a\u8fc7B\u5411\u6570\u636e\u5e93\u53d1\u8d77\u8bf7\u6c42\u5f97\u5230\u7684\u6570\u636e\u5c31\u662f\u5373\u65f6\u66f4\u65b0\u540e\u7684\u6570\u636eDB1\u3002<\/p>\n

\u4e0a\u9762\u662f\u6b63\u5e38\u8fd0\u4f5c\u7684\u60c5\u51b5\uff0c\u4f46\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\uff0c\u6700\u5927\u7684\u95ee\u9898\u5c31\u662f\u7f51\u7edc\uff0c\u73b0\u5728\u5047\u8bbe\u4e00\u79cd\u6781\u7aef\u60c5\u51b5\uff0cN1\u548cN2\u4e4b\u95f4\u7684\u7f51\u7edc\u65ad\u5f00\u4e86\uff0c\u4f46\u6211\u4eec\u4ecd\u8981\u652f\u6301\u8fd9\u79cd\u7f51\u7edc\u5f02\u5e38\uff0c\u4e5f\u5c31\u662f\u6ee1\u8db3\u5206\u533a\u5bb9\u9519\u6027\uff0c\u90a3\u4e48\u8fd9\u6837\u80fd\u4e0d\u80fd\u540c\u65f6\u6ee1\u8db3\u4e00\u81f4\u6027\u548c\u53ef\u7528\u6027\u5462\uff1f<\/p>\n

\u5047\u8bbeN1\u548cN2\u4e4b\u95f4\u901a\u4fe1\u7684\u65f6\u5019\u7f51\u7edc\u7a81\u7136\u51fa\u73b0\u6545\u969c\uff0c\u6709\u7528\u6237\u5411N1\u53d1\u9001\u6570\u636e\u66f4\u65b0\u8bf7\u6c42\uff0c\u90a3N1\u4e2d\u7684\u6570\u636eDB0\u5c06\u88ab\u66f4\u65b0\u4e3aDB1\uff0c\u7531\u4e8e\u7f51\u7edc\u662f\u65ad\u5f00\u7684\uff0cN2\u4e2d\u7684\u6570\u636e\u5e93\u4ecd\u65e7\u662fDB0\uff1b<\/p>\n

\u5982\u679c\u8fd9\u4e2a\u65f6\u5019\uff0c\u6709\u7528\u6237\u5411N2\u53d1\u9001\u6570\u636e\u8bfb\u53d6\u8bf7\u6c42\uff0c\u7531\u4e8e\u6570\u636e\u8fd8\u6ca1\u6709\u8fdb\u884c\u540c\u6b65\uff0c\u5e94\u7528\u7a0b\u5e8f\u6ca1\u529e\u6cd5\u7acb\u5373\u7ed9\u7528\u6237\u8fd4\u56de\u6700\u65b0\u7684\u6570\u636eDB1\uff0c\u600e\u4e48\u529e\u5462\uff1f\u6709\u4e8c\u79cd\u9009\u62e9\uff0c\u7b2c\u4e00\uff0c\u727a\u7272\u6570\u636e\u4e00\u81f4\u6027\uff0c\u54cd\u5e94\u65e7\u7684\u6570\u636eDB0\u7ed9\u7528\u6237\uff1b\u7b2c\u4e8c\uff0c\u727a\u7272\u53ef\u7528\u6027\uff0c\u963b\u585e\u7b49\u5f85\uff0c\u76f4\u5230\u7f51\u7edc\u8fde\u63a5\u6062\u590d\uff0c\u6570\u636e\u66f4\u65b0\u64cd\u4f5c\u5b8c\u6210\u4e4b\u540e\uff0c\u518d\u7ed9\u7528\u6237\u54cd\u5e94\u6700\u65b0\u7684\u6570\u636eDB1\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

https:\/\/zhuanlan.zhihu.com\/p\/50990721 CAP\u5373\uff1a Consistency […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[128],"tags":[156],"class_list":["post-380","post","type-post","status-publish","format-standard","hentry","category-system-architecture","tag-cap"],"_links":{"self":[{"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=\/wp\/v2\/posts\/380","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=380"}],"version-history":[{"count":1,"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=\/wp\/v2\/posts\/380\/revisions"}],"predecessor-version":[{"id":2054,"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=\/wp\/v2\/posts\/380\/revisions\/2054"}],"wp:attachment":[{"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=380"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=380"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.ttwow.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=380"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}