{"id":277,"date":"2018-11-22T19:11:56","date_gmt":"2018-11-22T11:11:56","guid":{"rendered":"https:\/\/www.ccagml.com\/?p=277"},"modified":"2019-02-21T10:10:57","modified_gmt":"2019-02-21T02:10:57","slug":"%e5%88%86%e5%b8%83%e5%bc%8f%e5%9f%ba%e7%a1%80%e7%9f%a5%e8%af%86","status":"publish","type":"post","link":"https:\/\/www.ccagml.com\/?p=277","title":{"rendered":"\u5206\u5e03\u5f0f\u57fa\u7840\u77e5\u8bc6"},"content":{"rendered":"<ul>\n<li><a href=\"https:\/\/github.com\/CyC2018\/\" target=\"_blank\" rel=\"noopener\">\u53c2\u8003<\/a><\/li>\n<\/ul>\n<h1>\u4e00\u3001\u5206\u5e03\u5f0f\u9501<\/h1>\n<p>\u5728\u5355\u673a\u573a\u666f\u4e0b\uff0c\u53ef\u4ee5\u4f7f\u7528\u8bed\u8a00\u7684\u5185\u7f6e\u9501\u6765\u5b9e\u73b0\u8fdb\u7a0b\u540c\u6b65\u3002\u4f46\u662f\u5728\u5206\u5e03\u5f0f\u573a\u666f\u4e0b\uff0c\u9700\u8981\u540c\u6b65\u7684\u8fdb\u7a0b\u53ef\u80fd\u4f4d\u4e8e\u4e0d\u540c\u7684\u8282\u70b9\u4e0a\uff0c\u90a3\u4e48\u5c31\u9700\u8981\u4f7f\u7528\u5206\u5e03\u5f0f\u9501\u3002<\/p>\n<p>\u963b\u585e\u9501\u901a\u5e38\u4f7f\u7528\u4e92\u65a5\u91cf\u6765\u5b9e\u73b0\uff1a<\/p>\n<ul>\n<li>\u4e92\u65a5\u91cf\u4e3a 0 \u8868\u793a\u6709\u5176\u5b83\u8fdb\u7a0b\u5728\u4f7f\u7528\u9501\uff0c\u6b64\u65f6\u5904\u4e8e\u9501\u5b9a\u72b6\u6001\uff1b<\/li>\n<li>\u4e92\u65a5\u91cf\u4e3a 1 \u8868\u793a\u672a\u9501\u5b9a\u72b6\u6001\u3002<\/li>\n<\/ul>\n<p>1 \u548c 0 \u53ef\u4ee5\u7528\u4e00\u4e2a\u6574\u578b\u503c\u8868\u793a\uff0c\u4e5f\u53ef\u4ee5\u7528\u67d0\u4e2a\u6570\u636e\u662f\u5426\u5b58\u5728\u8868\u793a\u3002<\/p>\n<h2>\u6570\u636e\u5e93\u7684\u552f\u4e00\u7d22\u5f15<\/h2>\n<p>\u83b7\u5f97\u9501\u65f6\u5411\u8868\u4e2d\u63d2\u5165\u4e00\u6761\u8bb0\u5f55\uff0c\u91ca\u653e\u9501\u65f6\u5220\u9664\u8fd9\u6761\u8bb0\u5f55\u3002\u552f\u4e00\u7d22\u5f15\u53ef\u4ee5\u4fdd\u8bc1\u8be5\u8bb0\u5f55\u53ea\u88ab\u63d2\u5165\u4e00\u6b21\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u7528\u8fd9\u4e2a\u8bb0\u5f55\u662f\u5426\u5b58\u5728\u6765\u5224\u65ad\u662f\u5426\u5b58\u4e8e\u9501\u5b9a\u72b6\u6001\u3002<\/p>\n<p>\u5b58\u5728\u4ee5\u4e0b\u51e0\u4e2a\u95ee\u9898\uff1a<\/p>\n<ul>\n<li>\u9501\u6ca1\u6709\u5931\u6548\u65f6\u95f4\uff0c\u89e3\u9501\u5931\u8d25\u7684\u8bdd\u5176\u5b83\u8fdb\u7a0b\u65e0\u6cd5\u518d\u83b7\u5f97\u8be5\u9501\u3002<\/li>\n<li>\u53ea\u80fd\u662f\u975e\u963b\u585e\u9501\uff0c\u63d2\u5165\u5931\u8d25\u76f4\u63a5\u5c31\u62a5\u9519\u4e86\uff0c\u65e0\u6cd5\u91cd\u8bd5\u3002<\/li>\n<li>\u4e0d\u53ef\u91cd\u5165\uff0c\u5df2\u7ecf\u83b7\u5f97\u9501\u7684\u8fdb\u7a0b\u4e5f\u5fc5\u987b\u91cd\u65b0\u83b7\u53d6\u9501\u3002<\/li>\n<\/ul>\n<h2>Redis \u7684 SETNX \u6307\u4ee4<\/h2>\n<p>\u4f7f\u7528 SETNX\uff08set if not exist\uff09\u6307\u4ee4\u63d2\u5165\u4e00\u4e2a\u952e\u503c\u5bf9\uff0c\u5982\u679c Key \u5df2\u7ecf\u5b58\u5728\uff0c\u90a3\u4e48\u4f1a\u8fd4\u56de False\uff0c\u5426\u5219\u63d2\u5165\u6210\u529f\u5e76\u8fd4\u56de True\u3002<\/p>\n<p>SETNX \u6307\u4ee4\u548c\u6570\u636e\u5e93\u7684\u552f\u4e00\u7d22\u5f15\u7c7b\u4f3c\uff0c\u4fdd\u8bc1\u4e86\u53ea\u5b58\u5728\u4e00\u4e2a Key \u7684\u952e\u503c\u5bf9\uff0c\u90a3\u4e48\u53ef\u4ee5\u7528\u4e00\u4e2a Key \u7684\u952e\u503c\u5bf9\u662f\u5426\u5b58\u5728\u6765\u5224\u65ad\u662f\u5426\u5b58\u4e8e\u9501\u5b9a\u72b6\u6001\u3002<\/p>\n<p>EXPIRE \u6307\u4ee4\u53ef\u4ee5\u4e3a\u4e00\u4e2a\u952e\u503c\u5bf9\u8bbe\u7f6e\u4e00\u4e2a\u8fc7\u671f\u65f6\u95f4\uff0c\u4ece\u800c\u907f\u514d\u4e86\u6570\u636e\u5e93\u552f\u4e00\u7d22\u5f15\u5b9e\u73b0\u65b9\u5f0f\u4e2d\u91ca\u653e\u9501\u5931\u8d25\u7684\u95ee\u9898\u3002<\/p>\n<h2>Redis \u7684 RedLock \u7b97\u6cd5<\/h2>\n<p>\u4f7f\u7528\u4e86\u591a\u4e2a Redis \u5b9e\u4f8b\u6765\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\uff0c\u8fd9\u662f\u4e3a\u4e86\u4fdd\u8bc1\u5728\u53d1\u751f\u5355\u70b9\u6545\u969c\u65f6\u4ecd\u7136\u53ef\u7528\u3002<\/p>\n<ul>\n<li>\u5c1d\u8bd5\u4ece N \u4e2a\u76f8\u4e92\u72ec\u7acb Redis \u5b9e\u4f8b\u83b7\u53d6\u9501\uff1b<\/li>\n<li>\u8ba1\u7b97\u83b7\u53d6\u9501\u6d88\u8017\u7684\u65f6\u95f4\uff0c\u53ea\u6709\u5f53\u8fd9\u4e2a\u65f6\u95f4\u5c0f\u4e8e\u9501\u7684\u8fc7\u671f\u65f6\u95f4\uff0c\u5e76\u4e14\u4ece\u5927\u591a\u6570\uff08N \/ 2 + 1\uff09\u5b9e\u4f8b\u4e0a\u83b7\u53d6\u4e86\u9501\uff0c\u90a3\u4e48\u5c31\u8ba4\u4e3a\u9501\u83b7\u53d6\u6210\u529f\u4e86\uff1b<\/li>\n<li>\u5982\u679c\u9501\u83b7\u53d6\u5931\u8d25\uff0c\u5c31\u5230\u6bcf\u4e2a\u5b9e\u4f8b\u4e0a\u91ca\u653e\u9501\u3002<\/li>\n<\/ul>\n<h2>Zookeeper \u7684\u6709\u5e8f\u8282\u70b9<\/h2>\n<h3>1. Zookeeper \u62bd\u8c61\u6a21\u578b<\/h3>\n<p>Zookeeper \u63d0\u4f9b\u4e86\u4e00\u79cd\u6811\u5f62\u7ed3\u6784\u7ea7\u7684\u547d\u540d\u7a7a\u95f4\uff0c\/app1\/p_1 \u8282\u70b9\u7684\u7236\u8282\u70b9\u4e3a \/app1\u3002<\/p>\n<div align=\"center\"> <img src=\"pics\/b3a421e3-41b4-4e99-b612-bc695a7f622f.jpg\"\/> <\/div>\n<p><\/p>\n<h3>2. \u8282\u70b9\u7c7b\u578b<\/h3>\n<ul>\n<li>\u6c38\u4e45\u8282\u70b9\uff1a\u4e0d\u4f1a\u56e0\u4e3a\u4f1a\u8bdd\u7ed3\u675f\u6216\u8005\u8d85\u65f6\u800c\u6d88\u5931\uff1b<\/li>\n<li>\u4e34\u65f6\u8282\u70b9\uff1a\u5982\u679c\u4f1a\u8bdd\u7ed3\u675f\u6216\u8005\u8d85\u65f6\u5c31\u4f1a\u6d88\u5931\uff1b<\/li>\n<li>\u6709\u5e8f\u8282\u70b9\uff1a\u4f1a\u5728\u8282\u70b9\u540d\u7684\u540e\u9762\u52a0\u4e00\u4e2a\u6570\u5b57\u540e\u7f00\uff0c\u5e76\u4e14\u662f\u6709\u5e8f\u7684\uff0c\u4f8b\u5982\u751f\u6210\u7684\u6709\u5e8f\u8282\u70b9\u4e3a \/lock\/node-0000000000\uff0c\u5b83\u7684\u4e0b\u4e00\u4e2a\u6709\u5e8f\u8282\u70b9\u5219\u4e3a \/lock\/node-0000000001\uff0c\u4ee5\u6b64\u7c7b\u63a8\u3002<\/li>\n<\/ul>\n<h3>3. \u76d1\u542c\u5668<\/h3>\n<p>\u4e3a\u4e00\u4e2a\u8282\u70b9\u6ce8\u518c\u76d1\u542c\u5668\uff0c\u5728\u8282\u70b9\u72b6\u6001\u53d1\u751f\u6539\u53d8\u65f6\uff0c\u4f1a\u7ed9\u5ba2\u6237\u7aef\u53d1\u9001\u6d88\u606f\u3002<\/p>\n<h3>4. \u5206\u5e03\u5f0f\u9501\u5b9e\u73b0<\/h3>\n<ul>\n<li>\u521b\u5efa\u4e00\u4e2a\u9501\u76ee\u5f55 \/lock\uff1b<\/li>\n<li>\u5f53\u4e00\u4e2a\u5ba2\u6237\u7aef\u9700\u8981\u83b7\u53d6\u9501\u65f6\uff0c\u5728 \/lock \u4e0b\u521b\u5efa\u4e34\u65f6\u7684\u4e14\u6709\u5e8f\u7684\u5b50\u8282\u70b9\uff1b<\/li>\n<li>\u5ba2\u6237\u7aef\u83b7\u53d6 \/lock \u4e0b\u7684\u5b50\u8282\u70b9\u5217\u8868\uff0c\u5224\u65ad\u81ea\u5df1\u521b\u5efa\u7684\u5b50\u8282\u70b9\u662f\u5426\u4e3a\u5f53\u524d\u5b50\u8282\u70b9\u5217\u8868\u4e2d\u5e8f\u53f7\u6700\u5c0f\u7684\u5b50\u8282\u70b9\uff0c\u5982\u679c\u662f\u5219\u8ba4\u4e3a\u83b7\u5f97\u9501\uff1b\u5426\u5219\u76d1\u542c\u81ea\u5df1\u7684\u524d\u4e00\u4e2a\u5b50\u8282\u70b9\uff0c\u83b7\u5f97\u5b50\u8282\u70b9\u7684\u53d8\u66f4\u901a\u77e5\u540e\u91cd\u590d\u6b64\u6b65\u9aa4\u76f4\u81f3\u83b7\u5f97\u9501\uff1b<\/li>\n<li>\u6267\u884c\u4e1a\u52a1\u4ee3\u7801\uff0c\u5b8c\u6210\u540e\uff0c\u5220\u9664\u5bf9\u5e94\u7684\u5b50\u8282\u70b9\u3002<\/li>\n<\/ul>\n<h3>5. \u4f1a\u8bdd\u8d85\u65f6<\/h3>\n<p>\u5982\u679c\u4e00\u4e2a\u5df2\u7ecf\u83b7\u5f97\u9501\u7684\u4f1a\u8bdd\u8d85\u65f6\u4e86\uff0c\u56e0\u4e3a\u521b\u5efa\u7684\u662f\u4e34\u65f6\u8282\u70b9\uff0c\u6240\u4ee5\u8be5\u4f1a\u8bdd\u5bf9\u5e94\u7684\u4e34\u65f6\u8282\u70b9\u4f1a\u88ab\u5220\u9664\uff0c\u5176\u5b83\u4f1a\u8bdd\u5c31\u53ef\u4ee5\u83b7\u5f97\u9501\u4e86\u3002\u53ef\u4ee5\u770b\u5230\uff0cZookeeper \u5206\u5e03\u5f0f\u9501\u4e0d\u4f1a\u51fa\u73b0\u6570\u636e\u5e93\u7684\u552f\u4e00\u7d22\u5f15\u5b9e\u73b0\u7684\u5206\u5e03\u5f0f\u9501\u91ca\u653e\u9501\u5931\u8d25\u95ee\u9898\u3002<\/p>\n<h3>6. \u7f8a\u7fa4\u6548\u5e94<\/h3>\n<p>\u4e00\u4e2a\u8282\u70b9\u672a\u83b7\u5f97\u9501\uff0c\u53ea\u9700\u8981\u76d1\u542c\u81ea\u5df1\u7684\u524d\u4e00\u4e2a\u5b50\u8282\u70b9\uff0c\u8fd9\u662f\u56e0\u4e3a\u5982\u679c\u76d1\u542c\u6240\u6709\u7684\u5b50\u8282\u70b9\uff0c\u90a3\u4e48\u4efb\u610f\u4e00\u4e2a\u5b50\u8282\u70b9\u72b6\u6001\u6539\u53d8\uff0c\u5176\u5b83\u6240\u6709\u5b50\u8282\u70b9\u90fd\u4f1a\u6536\u5230\u901a\u77e5\uff08\u7f8a\u7fa4\u6548\u5e94\uff09\uff0c\u800c\u6211\u4eec\u53ea\u5e0c\u671b\u5b83\u7684\u540e\u4e00\u4e2a\u5b50\u8282\u70b9\u6536\u5230\u901a\u77e5\u3002<\/p>\n<h1>\u4e8c\u3001\u5206\u5e03\u5f0f\u4e8b\u52a1<\/h1>\n<p>\u6307\u4e8b\u52a1\u7684\u64cd\u4f5c\u4f4d\u4e8e\u4e0d\u540c\u7684\u8282\u70b9\u4e0a\uff0c\u9700\u8981\u4fdd\u8bc1\u4e8b\u52a1\u7684 ACID \u7279\u6027\u3002<\/p>\n<p>\u4f8b\u5982\u5728\u4e0b\u5355\u573a\u666f\u4e0b\uff0c\u5e93\u5b58\u548c\u8ba2\u5355\u5982\u679c\u4e0d\u5728\u540c\u4e00\u4e2a\u8282\u70b9\u4e0a\uff0c\u5c31\u6d89\u53ca\u5206\u5e03\u5f0f\u4e8b\u52a1\u3002<\/p>\n<h2>\u672c\u5730\u6d88\u606f\u8868<\/h2>\n<p>\u672c\u5730\u6d88\u606f\u8868\u4e0e\u4e1a\u52a1\u6570\u636e\u8868\u5904\u4e8e\u540c\u4e00\u4e2a\u6570\u636e\u5e93\u4e2d\uff0c\u8fd9\u6837\u5c31\u80fd\u5229\u7528\u672c\u5730\u4e8b\u52a1\u6765\u4fdd\u8bc1\u5728\u5bf9\u8fd9\u4e24\u4e2a\u8868\u7684\u64cd\u4f5c\u6ee1\u8db3\u4e8b\u52a1\u7279\u6027\uff0c\u5e76\u4e14\u4f7f\u7528\u4e86\u6d88\u606f\u961f\u5217\u6765\u4fdd\u8bc1\u6700\u7ec8\u4e00\u81f4\u6027\u3002<\/p>\n<ol>\n<li>\u5728\u5206\u5e03\u5f0f\u4e8b\u52a1\u64cd\u4f5c\u7684\u4e00\u65b9\u5b8c\u6210\u5199\u4e1a\u52a1\u6570\u636e\u7684\u64cd\u4f5c\u4e4b\u540e\u5411\u672c\u5730\u6d88\u606f\u8868\u53d1\u9001\u4e00\u4e2a\u6d88\u606f\uff0c\u672c\u5730\u4e8b\u52a1\u80fd\u4fdd\u8bc1\u8fd9\u4e2a\u6d88\u606f\u4e00\u5b9a\u4f1a\u88ab\u5199\u5165\u672c\u5730\u6d88\u606f\u8868\u4e2d\u3002<\/li>\n<li>\u4e4b\u540e\u5c06\u672c\u5730\u6d88\u606f\u8868\u4e2d\u7684\u6d88\u606f\u8f6c\u53d1\u5230 Kafka \u7b49\u6d88\u606f\u961f\u5217\u4e2d\uff0c\u5982\u679c\u8f6c\u53d1\u6210\u529f\u5219\u5c06\u6d88\u606f\u4ece\u672c\u5730\u6d88\u606f\u8868\u4e2d\u5220\u9664\uff0c\u5426\u5219\u7ee7\u7eed\u91cd\u65b0\u8f6c\u53d1\u3002<\/li>\n<li>\u5728\u5206\u5e03\u5f0f\u4e8b\u52a1\u64cd\u4f5c\u7684\u53e6\u4e00\u65b9\u4ece\u6d88\u606f\u961f\u5217\u4e2d\u8bfb\u53d6\u4e00\u4e2a\u6d88\u606f\uff0c\u5e76\u6267\u884c\u6d88\u606f\u4e2d\u7684\u64cd\u4f5c\u3002<\/li>\n<\/ol>\n<div align=\"center\"> <img src=\"pics\/76c7597a-8316-460d-b8fb-9752c4c43947.jpg\"\/> <\/div>\n<p><\/p>\n<h2>2PC<\/h2>\n<p>\u4e24\u9636\u6bb5\u63d0\u4ea4\uff08Two-phase Commit\uff0c2PC\uff09\uff0c\u901a\u8fc7\u5f15\u5165\u534f\u8c03\u8005\uff08Coordinator\uff09\u6765\u534f\u8c03\u53c2\u4e0e\u8005\u7684\u884c\u4e3a\uff0c\u5e76\u6700\u7ec8\u51b3\u5b9a\u8fd9\u4e9b\u53c2\u4e0e\u8005\u662f\u5426\u8981\u771f\u6b63\u6267\u884c\u4e8b\u52a1\u3002<\/p>\n<h3>1. \u8fd0\u884c\u8fc7\u7a0b<\/h3>\n<h4>1.1 \u51c6\u5907\u9636\u6bb5<\/h4>\n<p>\u534f\u8c03\u8005\u8be2\u95ee\u53c2\u4e0e\u8005\u4e8b\u52a1\u662f\u5426\u6267\u884c\u6210\u529f\uff0c\u53c2\u4e0e\u8005\u53d1\u56de\u4e8b\u52a1\u6267\u884c\u7ed3\u679c\u3002<\/p>\n<div align=\"center\"> <img src=\"pics\/963fac12-4eac-4922-8a5f-f262c11f80fb.jpg\"\/> <\/div>\n<p><\/p>\n<h4>1.2 \u63d0\u4ea4\u9636\u6bb5<\/h4>\n<p>\u5982\u679c\u4e8b\u52a1\u5728\u6bcf\u4e2a\u53c2\u4e0e\u8005\u4e0a\u90fd\u6267\u884c\u6210\u529f\uff0c\u4e8b\u52a1\u534f\u8c03\u8005\u53d1\u9001\u901a\u77e5\u8ba9\u53c2\u4e0e\u8005\u63d0\u4ea4\u4e8b\u52a1\uff1b\u5426\u5219\uff0c\u534f\u8c03\u8005\u53d1\u9001\u901a\u77e5\u8ba9\u53c2\u4e0e\u8005\u56de\u6eda\u4e8b\u52a1\u3002<\/p>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u51c6\u5907\u9636\u6bb5\uff0c\u53c2\u4e0e\u8005\u6267\u884c\u4e86\u4e8b\u52a1\uff0c\u4f46\u662f\u8fd8\u672a\u63d0\u4ea4\u3002\u53ea\u6709\u5728\u63d0\u4ea4\u9636\u6bb5\u63a5\u6536\u5230\u534f\u8c03\u8005\u53d1\u6765\u7684\u901a\u77e5\u540e\uff0c\u624d\u8fdb\u884c\u63d0\u4ea4\u6216\u8005\u56de\u6eda\u3002<\/p>\n<div align=\"center\"> <img src=\"pics\/9ffb82ad-9b7f-44df-b93f-fc8b3f4093a6.jpg\"\/> <\/div>\n<p><\/p>\n<h3>2. \u5b58\u5728\u7684\u95ee\u9898<\/h3>\n<h4>2.1 \u540c\u6b65\u963b\u585e<\/h4>\n<p>\u6240\u6709\u4e8b\u52a1\u53c2\u4e0e\u8005\u5728\u7b49\u5f85\u5176\u5b83\u53c2\u4e0e\u8005\u54cd\u5e94\u7684\u65f6\u5019\u90fd\u5904\u4e8e\u540c\u6b65\u963b\u585e\u72b6\u6001\uff0c\u65e0\u6cd5\u8fdb\u884c\u5176\u5b83\u64cd\u4f5c\u3002<\/p>\n<h4>2.2 \u5355\u70b9\u95ee\u9898<\/h4>\n<p>\u534f\u8c03\u8005\u5728 2PC \u4e2d\u8d77\u5230\u975e\u5e38\u5927\u7684\u4f5c\u7528\uff0c\u53d1\u751f\u6545\u969c\u5c06\u4f1a\u9020\u6210\u5f88\u5927\u5f71\u54cd\u3002\u7279\u522b\u662f\u5728\u9636\u6bb5\u4e8c\u53d1\u751f\u6545\u969c\uff0c\u6240\u6709\u53c2\u4e0e\u8005\u4f1a\u4e00\u76f4\u7b49\u5f85\uff0c\u65e0\u6cd5\u5b8c\u6210\u5176\u5b83\u64cd\u4f5c\u3002<\/p>\n<h4>2.3 \u6570\u636e\u4e0d\u4e00\u81f4<\/h4>\n<p>\u5728\u9636\u6bb5\u4e8c\uff0c\u5982\u679c\u534f\u8c03\u8005\u53ea\u53d1\u9001\u4e86\u90e8\u5206 Commit \u6d88\u606f\uff0c\u6b64\u65f6\u7f51\u7edc\u53d1\u751f\u5f02\u5e38\uff0c\u90a3\u4e48\u53ea\u6709\u90e8\u5206\u53c2\u4e0e\u8005\u63a5\u6536\u5230 Commit \u6d88\u606f\uff0c\u4e5f\u5c31\u662f\u8bf4\u53ea\u6709\u90e8\u5206\u53c2\u4e0e\u8005\u63d0\u4ea4\u4e86\u4e8b\u52a1\uff0c\u4f7f\u5f97\u7cfb\u7edf\u6570\u636e\u4e0d\u4e00\u81f4\u3002<\/p>\n<h4>2.4 \u592a\u8fc7\u4fdd\u5b88<\/h4>\n<p>\u4efb\u610f\u4e00\u4e2a\u8282\u70b9\u5931\u8d25\u5c31\u4f1a\u5bfc\u81f4\u6574\u4e2a\u4e8b\u52a1\u5931\u8d25\uff0c\u6ca1\u6709\u5b8c\u5584\u7684\u5bb9\u9519\u673a\u5236\u3002<\/p>\n<h1>\u4e09\u3001CAP<\/h1>\n<p>\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e0d\u53ef\u80fd\u540c\u65f6\u6ee1\u8db3\u4e00\u81f4\u6027\uff08C\uff1aConsistency\uff09\u3001\u53ef\u7528\u6027\uff08A\uff1aAvailability\uff09\u548c\u5206\u533a\u5bb9\u5fcd\u6027\uff08P\uff1aPartition Tolerance\uff09\uff0c\u6700\u591a\u53ea\u80fd\u540c\u65f6\u6ee1\u8db3\u5176\u4e2d\u4e24\u9879\u3002<\/p>\n<div align=\"center\"> <img src=\"pics\/c6fdb958-578d-4685-a5fa-400857be91d5.jpg\"\/> <\/div>\n<p><\/p>\n<h2>\u4e00\u81f4\u6027<\/h2>\n<p>\u4e00\u81f4\u6027\u6307\u7684\u662f\u591a\u4e2a\u6570\u636e\u526f\u672c\u662f\u5426\u80fd\u4fdd\u6301\u4e00\u81f4\u7684\u7279\u6027\uff0c\u5728\u4e00\u81f4\u6027\u7684\u6761\u4ef6\u4e0b\uff0c\u7cfb\u7edf\u5728\u6267\u884c\u6570\u636e\u66f4\u65b0\u64cd\u4f5c\u4e4b\u540e\u80fd\u591f\u4ece\u4e00\u81f4\u6027\u72b6\u6001\u8f6c\u79fb\u5230\u53e6\u4e00\u4e2a\u4e00\u81f4\u6027\u72b6\u6001\u3002<\/p>\n<p>\u5bf9\u7cfb\u7edf\u7684\u4e00\u4e2a\u6570\u636e\u66f4\u65b0\u6210\u529f\u4e4b\u540e\uff0c\u5982\u679c\u6240\u6709\u7528\u6237\u90fd\u80fd\u591f\u8bfb\u53d6\u5230\u6700\u65b0\u7684\u503c\uff0c\u8be5\u7cfb\u7edf\u5c31\u88ab\u8ba4\u4e3a\u5177\u6709\u5f3a\u4e00\u81f4\u6027\u3002<\/p>\n<h2>\u53ef\u7528\u6027<\/h2>\n<p>\u53ef\u7528\u6027\u6307\u5206\u5e03\u5f0f\u7cfb\u7edf\u5728\u9762\u5bf9\u5404\u79cd\u5f02\u5e38\u65f6\u53ef\u4ee5\u63d0\u4f9b\u6b63\u5e38\u670d\u52a1\u7684\u80fd\u529b\uff0c\u53ef\u4ee5\u7528\u7cfb\u7edf\u53ef\u7528\u65f6\u95f4\u5360\u603b\u65f6\u95f4\u7684\u6bd4\u503c\u6765\u8861\u91cf\uff0c4 \u4e2a 9 \u7684\u53ef\u7528\u6027\u8868\u793a\u7cfb\u7edf 99.99% \u7684\u65f6\u95f4\u662f\u53ef\u7528\u7684\u3002<\/p>\n<p>\u5728\u53ef\u7528\u6027\u6761\u4ef6\u4e0b\uff0c\u8981\u6c42\u7cfb\u7edf\u63d0\u4f9b\u7684\u670d\u52a1\u4e00\u76f4\u5904\u4e8e\u53ef\u7528\u7684\u72b6\u6001\uff0c\u5bf9\u4e8e\u7528\u6237\u7684\u6bcf\u4e00\u4e2a\u64cd\u4f5c\u8bf7\u6c42\u603b\u662f\u80fd\u591f\u5728\u6709\u9650\u7684\u65f6\u95f4\u5185\u8fd4\u56de\u7ed3\u679c\u3002<\/p>\n<h2>\u5206\u533a\u5bb9\u5fcd\u6027<\/h2>\n<p>\u7f51\u7edc\u5206\u533a\u6307\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\u7684\u8282\u70b9\u88ab\u5212\u5206\u4e3a\u591a\u4e2a\u533a\u57df\uff0c\u6bcf\u4e2a\u533a\u57df\u5185\u90e8\u53ef\u4ee5\u901a\u4fe1\uff0c\u4f46\u662f\u533a\u57df\u4e4b\u95f4\u65e0\u6cd5\u901a\u4fe1\u3002<\/p>\n<p>\u5728\u5206\u533a\u5bb9\u5fcd\u6027\u6761\u4ef6\u4e0b\uff0c\u5206\u5e03\u5f0f\u7cfb\u7edf\u5728\u9047\u5230\u4efb\u4f55\u7f51\u7edc\u5206\u533a\u6545\u969c\u7684\u65f6\u5019\uff0c\u4ecd\u7136\u9700\u8981\u80fd\u5bf9\u5916\u63d0\u4f9b\u4e00\u81f4\u6027\u548c\u53ef\u7528\u6027\u7684\u670d\u52a1\uff0c\u9664\u975e\u662f\u6574\u4e2a\u7f51\u7edc\u73af\u5883\u90fd\u53d1\u751f\u4e86\u6545\u969c\u3002<\/p>\n<h2>\u6743\u8861<\/h2>\n<p>\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\uff0c\u5206\u533a\u5bb9\u5fcd\u6027\u5fc5\u4e0d\u53ef\u5c11\uff0c\u56e0\u4e3a\u9700\u8981\u603b\u662f\u5047\u8bbe\u7f51\u7edc\u662f\u4e0d\u53ef\u9760\u7684\u3002\u56e0\u6b64\uff0cCAP \u7406\u8bba\u5b9e\u9645\u4e0a\u662f\u8981\u5728\u53ef\u7528\u6027\u548c\u4e00\u81f4\u6027\u4e4b\u95f4\u505a\u6743\u8861\u3002<\/p>\n<p>\u53ef\u7528\u6027\u548c\u4e00\u81f4\u6027\u5f80\u5f80\u662f\u51b2\u7a81\u7684\uff0c\u5f88\u96be\u4f7f\u5b83\u4eec\u540c\u65f6\u6ee1\u8db3\u3002\u5728\u591a\u4e2a\u8282\u70b9\u4e4b\u95f4\u8fdb\u884c\u6570\u636e\u540c\u6b65\u65f6\uff0c<\/p>\n<ul>\n<li>\u4e3a\u4e86\u4fdd\u8bc1\u4e00\u81f4\u6027\uff08CP\uff09\uff0c\u4e0d\u80fd\u8bbf\u95ee\u672a\u540c\u6b65\u5b8c\u6210\u7684\u8282\u70b9\uff0c\u4e5f\u5c31\u5931\u53bb\u4e86\u90e8\u5206\u53ef\u7528\u6027\uff1b<\/li>\n<li>\u4e3a\u4e86\u4fdd\u8bc1\u53ef\u7528\u6027\uff08AP\uff09\uff0c\u5141\u8bb8\u8bfb\u53d6\u6240\u6709\u8282\u70b9\u7684\u6570\u636e\uff0c\u4f46\u662f\u6570\u636e\u53ef\u80fd\u4e0d\u4e00\u81f4\u3002<\/li>\n<\/ul>\n<div align=\"center\"> <img src=\"pics\/0b587744-c0a8-46f2-8d72-e8f070d67b4b.jpg\"\/> <\/div>\n<p><\/p>\n<h1>\u56db\u3001BASE<\/h1>\n<p>BASE \u662f\u57fa\u672c\u53ef\u7528\uff08Basically Available\uff09\u3001\u8f6f\u72b6\u6001\uff08Soft State\uff09\u548c\u6700\u7ec8\u4e00\u81f4\u6027\uff08Eventually Consistent\uff09\u4e09\u4e2a\u77ed\u8bed\u7684\u7f29\u5199\u3002<\/p>\n<p>BASE \u7406\u8bba\u662f\u5bf9 CAP \u4e2d\u4e00\u81f4\u6027\u548c\u53ef\u7528\u6027\u6743\u8861\u7684\u7ed3\u679c\uff0c\u5b83\u7684\u6838\u5fc3\u601d\u60f3\u662f\uff1a\u5373\u4f7f\u65e0\u6cd5\u505a\u5230\u5f3a\u4e00\u81f4\u6027\uff0c\u4f46\u6bcf\u4e2a\u5e94\u7528\u90fd\u53ef\u4ee5\u6839\u636e\u81ea\u8eab\u4e1a\u52a1\u7279\u70b9\uff0c\u91c7\u7528\u9002\u5f53\u7684\u65b9\u5f0f\u6765\u4f7f\u7cfb\u7edf\u8fbe\u5230\u6700\u7ec8\u4e00\u81f4\u6027\u3002<\/p>\n<h2>\u57fa\u672c\u53ef\u7528<\/h2>\n<p>\u6307\u5206\u5e03\u5f0f\u7cfb\u7edf\u5728\u51fa\u73b0\u6545\u969c\u7684\u65f6\u5019\uff0c\u4fdd\u8bc1\u6838\u5fc3\u53ef\u7528\uff0c\u5141\u8bb8\u635f\u5931\u90e8\u5206\u53ef\u7528\u6027\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u7535\u5546\u5728\u505a\u4fc3\u9500\u65f6\uff0c\u4e3a\u4e86\u4fdd\u8bc1\u8d2d\u7269\u7cfb\u7edf\u7684\u7a33\u5b9a\u6027\uff0c\u90e8\u5206\u6d88\u8d39\u8005\u53ef\u80fd\u4f1a\u88ab\u5f15\u5bfc\u5230\u4e00\u4e2a\u964d\u7ea7\u7684\u9875\u9762\u3002<\/p>\n<h2>\u8f6f\u72b6\u6001<\/h2>\n<p>\u6307\u5141\u8bb8\u7cfb\u7edf\u4e2d\u7684\u6570\u636e\u5b58\u5728\u4e2d\u95f4\u72b6\u6001\uff0c\u5e76\u8ba4\u4e3a\u8be5\u4e2d\u95f4\u72b6\u6001\u4e0d\u4f1a\u5f71\u54cd\u7cfb\u7edf\u6574\u4f53\u53ef\u7528\u6027\uff0c\u5373\u5141\u8bb8\u7cfb\u7edf\u4e0d\u540c\u8282\u70b9\u7684\u6570\u636e\u526f\u672c\u4e4b\u95f4\u8fdb\u884c\u540c\u6b65\u7684\u8fc7\u7a0b\u5b58\u5728\u65f6\u5ef6\u3002<\/p>\n<h2>\u6700\u7ec8\u4e00\u81f4\u6027<\/h2>\n<p>\u6700\u7ec8\u4e00\u81f4\u6027\u5f3a\u8c03\u7684\u662f\u7cfb\u7edf\u4e2d\u6240\u6709\u7684\u6570\u636e\u526f\u672c\uff0c\u5728\u7ecf\u8fc7\u4e00\u6bb5\u65f6\u95f4\u7684\u540c\u6b65\u540e\uff0c\u6700\u7ec8\u80fd\u8fbe\u5230\u4e00\u81f4\u7684\u72b6\u6001\u3002<\/p>\n<p>ACID \u8981\u6c42\u5f3a\u4e00\u81f4\u6027\uff0c\u901a\u5e38\u8fd0\u7528\u5728\u4f20\u7edf\u7684\u6570\u636e\u5e93\u7cfb\u7edf\u4e0a\u3002\u800c BASE \u8981\u6c42\u6700\u7ec8\u4e00\u81f4\u6027\uff0c\u901a\u8fc7\u727a\u7272\u5f3a\u4e00\u81f4\u6027\u6765\u8fbe\u5230\u53ef\u7528\u6027\uff0c\u901a\u5e38\u8fd0\u7528\u5728\u5927\u578b\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\u3002<\/p>\n<p>\u5728\u5b9e\u9645\u7684\u5206\u5e03\u5f0f\u573a\u666f\u4e2d\uff0c\u4e0d\u540c\u4e1a\u52a1\u5355\u5143\u548c\u7ec4\u4ef6\u5bf9\u4e00\u81f4\u6027\u7684\u8981\u6c42\u662f\u4e0d\u540c\u7684\uff0c\u56e0\u6b64 ACID \u548c BASE \u5f80\u5f80\u4f1a\u7ed3\u5408\u5728\u4e00\u8d77\u4f7f\u7528\u3002<\/p>\n<h1>\u4e94\u3001Paxos<\/h1>\n<p>\u7528\u4e8e\u8fbe\u6210\u5171\u8bc6\u6027\u95ee\u9898\uff0c\u5373\u5bf9\u591a\u4e2a\u8282\u70b9\u4ea7\u751f\u7684\u503c\uff0c\u8be5\u7b97\u6cd5\u80fd\u4fdd\u8bc1\u53ea\u9009\u51fa\u552f\u4e00\u4e00\u4e2a\u503c\u3002<\/p>\n<p>\u4e3b\u8981\u6709\u4e09\u7c7b\u8282\u70b9\uff1a<\/p>\n<ul>\n<li>\u63d0\u8bae\u8005\uff08Proposer\uff09\uff1a\u63d0\u8bae\u4e00\u4e2a\u503c\uff1b<\/li>\n<li>\u63a5\u53d7\u8005\uff08Acceptor\uff09\uff1a\u5bf9\u6bcf\u4e2a\u63d0\u8bae\u8fdb\u884c\u6295\u7968\uff1b<\/li>\n<li>\u544a\u77e5\u8005\uff08Learner\uff09\uff1a\u88ab\u544a\u77e5\u6295\u7968\u7684\u7ed3\u679c\uff0c\u4e0d\u53c2\u4e0e\u6295\u7968\u8fc7\u7a0b\u3002<\/li>\n<\/ul>\n<div align=\"center\"> <img src=\"pics\/b988877c-0f0a-4593-916d-de2081320628.jpg\"\/> <\/div>\n<p><\/p>\n<h2>\u6267\u884c\u8fc7\u7a0b<\/h2>\n<p>\u89c4\u5b9a\u4e00\u4e2a\u63d0\u8bae\u5305\u542b\u4e24\u4e2a\u5b57\u6bb5\uff1a[n, v]\uff0c\u5176\u4e2d n \u4e3a\u5e8f\u53f7\uff08\u5177\u6709\u552f\u4e00\u6027\uff09\uff0cv \u4e3a\u63d0\u8bae\u503c\u3002<\/p>\n<h3>1. Prepare \u9636\u6bb5<\/h3>\n<p>\u4e0b\u56fe\u6f14\u793a\u4e86\u4e24\u4e2a Proposer \u548c\u4e09\u4e2a Acceptor \u7684\u7cfb\u7edf\u4e2d\u8fd0\u884c\u8be5\u7b97\u6cd5\u7684\u521d\u59cb\u8fc7\u7a0b\uff0c\u6bcf\u4e2a Proposer \u90fd\u4f1a\u5411\u6240\u6709 Acceptor \u53d1\u9001 Prepare \u8bf7\u6c42\u3002<\/p>\n<div align=\"center\"> <img src=\"pics\/1a9977e4-2f5c-49a6-aec9-f3027c9f46a7.png\"\/> <\/div>\n<p><\/p>\n<p>\u5f53 Acceptor \u63a5\u6536\u5230\u4e00\u4e2a Prepare \u8bf7\u6c42\uff0c\u5305\u542b\u7684\u63d0\u8bae\u4e3a [n1, v1]\uff0c\u5e76\u4e14\u4e4b\u524d\u8fd8\u672a\u63a5\u6536\u8fc7 Prepare \u8bf7\u6c42\uff0c\u90a3\u4e48\u53d1\u9001\u4e00\u4e2a Prepare \u54cd\u5e94\uff0c\u8bbe\u7f6e\u5f53\u524d\u63a5\u6536\u5230\u7684\u63d0\u8bae\u4e3a [n1, v1]\uff0c\u5e76\u4e14\u4fdd\u8bc1\u4ee5\u540e\u4e0d\u4f1a\u518d\u63a5\u53d7\u5e8f\u53f7\u5c0f\u4e8e n1 \u7684\u63d0\u8bae\u3002<\/p>\n<p>\u5982\u4e0b\u56fe\uff0cAcceptor X \u5728\u6536\u5230 [n=2, v=8] \u7684 Prepare \u8bf7\u6c42\u65f6\uff0c\u7531\u4e8e\u4e4b\u524d\u6ca1\u6709\u63a5\u6536\u8fc7\u63d0\u8bae\uff0c\u56e0\u6b64\u5c31\u53d1\u9001\u4e00\u4e2a [no previous] \u7684 Prepare \u54cd\u5e94\uff0c\u8bbe\u7f6e\u5f53\u524d\u63a5\u6536\u5230\u7684\u63d0\u8bae\u4e3a [n=2, v=8]\uff0c\u5e76\u4e14\u4fdd\u8bc1\u4ee5\u540e\u4e0d\u4f1a\u518d\u63a5\u53d7\u5e8f\u53f7\u5c0f\u4e8e 2 \u7684\u63d0\u8bae\u3002\u5176\u5b83\u7684 Acceptor \u7c7b\u4f3c\u3002<\/p>\n<div align=\"center\"> <img src=\"pics\/fb44307f-8e98-4ff7-a918-31dacfa564b4.jpg\"\/> <\/div>\n<p><\/p>\n<p>\u5982\u679c Acceptor \u63a5\u6536\u5230\u4e00\u4e2a Prepare \u8bf7\u6c42\uff0c\u5305\u542b\u7684\u63d0\u8bae\u4e3a [n2, v2]\uff0c\u5e76\u4e14\u4e4b\u524d\u5df2\u7ecf\u63a5\u6536\u8fc7\u63d0\u8bae [n1, v1]\u3002\u5982\u679c n1 > n2\uff0c\u90a3\u4e48\u5c31\u4e22\u5f03\u8be5\u63d0\u8bae\u8bf7\u6c42\uff1b\u5426\u5219\uff0c\u53d1\u9001 Prepare \u54cd\u5e94\uff0c\u8be5 Prepare \u54cd\u5e94\u5305\u542b\u4e4b\u524d\u5df2\u7ecf\u63a5\u6536\u8fc7\u7684\u63d0\u8bae [n1, v1]\uff0c\u8bbe\u7f6e\u5f53\u524d\u63a5\u6536\u5230\u7684\u63d0\u8bae\u4e3a [n2, v2]\uff0c\u5e76\u4e14\u4fdd\u8bc1\u4ee5\u540e\u4e0d\u4f1a\u518d\u63a5\u53d7\u5e8f\u53f7\u5c0f\u4e8e n2 \u7684\u63d0\u8bae\u3002<\/p>\n<p>\u5982\u4e0b\u56fe\uff0cAcceptor Z \u6536\u5230 Proposer A \u53d1\u6765\u7684 [n=2, v=8] \u7684 Prepare \u8bf7\u6c42\uff0c\u7531\u4e8e\u4e4b\u524d\u5df2\u7ecf\u63a5\u6536\u8fc7 [n=4, v=5] \u7684\u63d0\u8bae\uff0c\u5e76\u4e14 n > 2\uff0c\u56e0\u6b64\u5c31\u629b\u5f03\u8be5\u63d0\u8bae\u8bf7\u6c42\uff1bAcceptor X \u6536\u5230 Proposer B \u53d1\u6765\u7684 [n=4, v=5] \u7684 Prepare \u8bf7\u6c42\uff0c\u56e0\u4e3a\u4e4b\u524d\u63a5\u6536\u5230\u7684\u63d0\u8bae\u4e3a [n=2, v=8]\uff0c\u5e76\u4e14 2 &lt;= 4\uff0c\u56e0\u6b64\u5c31\u53d1\u9001 [n=2, v=8] \u7684 Prepare \u54cd\u5e94\uff0c\u8bbe\u7f6e\u5f53\u524d\u63a5\u6536\u5230\u7684\u63d0\u8bae\u4e3a [n=4, v=5]\uff0c\u5e76\u4e14\u4fdd\u8bc1\u4ee5\u540e\u4e0d\u4f1a\u518d\u63a5\u53d7\u5e8f\u53f7\u5c0f\u4e8e 4 \u7684\u63d0\u8bae\u3002Acceptor Y \u7c7b\u4f3c\u3002<\/p>\n<div align=\"center\"> <img src=\"pics\/2bcc58ad-bf7f-485c-89b5-e7cafc211ce2.jpg\"\/> <\/div>\n<p><\/p>\n<h3>2. Accept \u9636\u6bb5<\/h3>\n<p>\u5f53\u4e00\u4e2a Proposer \u63a5\u6536\u5230\u8d85\u8fc7\u4e00\u534a Acceptor \u7684 Prepare \u54cd\u5e94\u65f6\uff0c\u5c31\u53ef\u4ee5\u53d1\u9001 Accept \u8bf7\u6c42\u3002<\/p>\n<p>Proposer A \u63a5\u6536\u5230\u4e24\u4e2a Prepare \u54cd\u5e94\u4e4b\u540e\uff0c\u5c31\u53d1\u9001 [n=2, v=8] Accept \u8bf7\u6c42\u3002\u8be5 Accept \u8bf7\u6c42\u4f1a\u88ab\u6240\u6709 Acceptor \u4e22\u5f03\uff0c\u56e0\u4e3a\u6b64\u65f6\u6240\u6709 Acceptor \u90fd\u4fdd\u8bc1\u4e0d\u63a5\u53d7\u5e8f\u53f7\u5c0f\u4e8e 4 \u7684\u63d0\u8bae\u3002<\/p>\n<p>Proposer B \u8fc7\u540e\u4e5f\u6536\u5230\u4e86\u4e24\u4e2a Prepare \u54cd\u5e94\uff0c\u56e0\u6b64\u4e5f\u5f00\u59cb\u53d1\u9001 Accept \u8bf7\u6c42\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cAccept \u8bf7\u6c42\u7684 v \u9700\u8981\u53d6\u5b83\u6536\u5230\u7684\u6700\u5927\u63d0\u8bae\u7f16\u53f7\u5bf9\u5e94\u7684 v \u503c\uff0c\u4e5f\u5c31\u662f 8\u3002\u56e0\u6b64\u5b83\u53d1\u9001 [n=4, v=8] \u7684 Accept \u8bf7\u6c42\u3002<\/p>\n<div align=\"center\"> <img src=\"pics\/9b838aee-0996-44a5-9b0f-3d1e3e2f5100.png\"\/> <\/div>\n<p><\/p>\n<h3>3. Learn \u9636\u6bb5<\/h3>\n<p>Acceptor \u63a5\u6536\u5230 Accept \u8bf7\u6c42\u65f6\uff0c\u5982\u679c\u5e8f\u53f7\u5927\u4e8e\u7b49\u4e8e\u8be5 Acceptor \u627f\u8bfa\u7684\u6700\u5c0f\u5e8f\u53f7\uff0c\u90a3\u4e48\u5c31\u53d1\u9001 Learn \u63d0\u8bae\u7ed9\u6240\u6709\u7684 Learner\u3002\u5f53 Learner \u53d1\u73b0\u6709\u5927\u591a\u6570\u7684 Acceptor \u63a5\u6536\u4e86\u67d0\u4e2a\u63d0\u8bae\uff0c\u90a3\u4e48\u8be5\u63d0\u8bae\u7684\u63d0\u8bae\u503c\u5c31\u88ab Paxos \u9009\u62e9\u51fa\u6765\u3002<\/p>\n<div align=\"center\"> <img src=\"pics\/bf667594-bb4b-4634-bf9b-0596a45415ba.jpg\"\/> <\/div>\n<p><\/p>\n<h2>\u7ea6\u675f\u6761\u4ef6<\/h2>\n<h3>1&#46; \u6b63\u786e\u6027<\/h3>\n<p>\u6307\u53ea\u6709\u4e00\u4e2a\u63d0\u8bae\u503c\u4f1a\u751f\u6548\u3002<\/p>\n<p>\u56e0\u4e3a Paxos \u534f\u8bae\u8981\u6c42\u6bcf\u4e2a\u751f\u6548\u7684\u63d0\u8bae\u88ab\u591a\u6570 Acceptor \u63a5\u6536\uff0c\u5e76\u4e14 Acceptor \u4e0d\u4f1a\u63a5\u53d7\u4e24\u4e2a\u4e0d\u540c\u7684\u63d0\u8bae\uff0c\u56e0\u6b64\u53ef\u4ee5\u4fdd\u8bc1\u6b63\u786e\u6027\u3002<\/p>\n<h3>2&#46; \u53ef\u7ec8\u6b62\u6027<\/h3>\n<p>\u6307\u6700\u540e\u603b\u4f1a\u6709\u4e00\u4e2a\u63d0\u8bae\u751f\u6548\u3002<\/p>\n<p>Paxos \u534f\u8bae\u80fd\u591f\u8ba9 Proposer \u53d1\u9001\u7684\u63d0\u8bae\u671d\u7740\u80fd\u88ab\u5927\u591a\u6570 Acceptor \u63a5\u53d7\u7684\u90a3\u4e2a\u63d0\u8bae\u9760\u62e2\uff0c\u56e0\u6b64\u80fd\u591f\u4fdd\u8bc1\u53ef\u7ec8\u6b62\u6027\u3002<\/p>\n<h1>\u516d\u3001Raft<\/h1>\n<p>Raft \u4e5f\u662f\u5206\u5e03\u5f0f\u4e00\u81f4\u6027\u534f\u8bae\uff0c\u4e3b\u8981\u662f\u7528\u6765\u7ade\u9009\u4e3b\u8282\u70b9\u3002<\/p>\n<h2>\u5355\u4e2a Candidate \u7684\u7ade\u9009<\/h2>\n<p>\u6709\u4e09\u79cd\u8282\u70b9\uff1aFollower\u3001Candidate \u548c Leader\u3002Leader \u4f1a\u5468\u671f\u6027\u7684\u53d1\u9001\u5fc3\u8df3\u5305\u7ed9 Follower\u3002\u6bcf\u4e2a Follower \u90fd\u8bbe\u7f6e\u4e86\u4e00\u4e2a\u968f\u673a\u7684\u7ade\u9009\u8d85\u65f6\u65f6\u95f4\uff0c\u4e00\u822c\u4e3a 150ms\\~300ms\uff0c\u5982\u679c\u5728\u8fd9\u4e2a\u65f6\u95f4\u5185\u6ca1\u6709\u6536\u5230 Leader \u7684\u5fc3\u8df3\u5305\uff0c\u5c31\u4f1a\u53d8\u6210 Candidate\uff0c\u8fdb\u5165\u7ade\u9009\u9636\u6bb5\u3002<\/p>\n<ul>\n<li>\u4e0b\u56fe\u5c55\u793a\u4e00\u4e2a\u5206\u5e03\u5f0f\u7cfb\u7edf\u7684\u6700\u521d\u9636\u6bb5\uff0c\u6b64\u65f6\u53ea\u6709 Follower \u6ca1\u6709 Leader\u3002Node A \u7b49\u5f85\u4e00\u4e2a\u968f\u673a\u7684\u7ade\u9009\u8d85\u65f6\u65f6\u95f4\u4e4b\u540e\uff0c\u6ca1\u6536\u5230 Leader \u53d1\u6765\u7684\u5fc3\u8df3\u5305\uff0c\u56e0\u6b64\u8fdb\u5165\u7ade\u9009\u9636\u6bb5\u3002<\/li>\n<\/ul>\n<div align=\"center\"> <img src=\"pics\/111521118015898.gif\"\/> <\/div>\n<p><\/p>\n<ul>\n<li>\u6b64\u65f6 Node A \u53d1\u9001\u6295\u7968\u8bf7\u6c42\u7ed9\u5176\u5b83\u6240\u6709\u8282\u70b9\u3002<\/li>\n<\/ul>\n<div align=\"center\"> <img src=\"pics\/111521118445538.gif\"\/> <\/div>\n<p><\/p>\n<ul>\n<li>\u5176\u5b83\u8282\u70b9\u4f1a\u5bf9\u8bf7\u6c42\u8fdb\u884c\u56de\u590d\uff0c\u5982\u679c\u8d85\u8fc7\u4e00\u534a\u7684\u8282\u70b9\u56de\u590d\u4e86\uff0c\u90a3\u4e48\u8be5 Candidate \u5c31\u4f1a\u53d8\u6210 Leader\u3002<\/li>\n<\/ul>\n<div align=\"center\"> <img src=\"pics\/111521118483039.gif\"\/> <\/div>\n<p><\/p>\n<ul>\n<li>\u4e4b\u540e Leader \u4f1a\u5468\u671f\u6027\u5730\u53d1\u9001\u5fc3\u8df3\u5305\u7ed9 Follower\uff0cFollower \u63a5\u6536\u5230\u5fc3\u8df3\u5305\uff0c\u4f1a\u91cd\u65b0\u5f00\u59cb\u8ba1\u65f6\u3002<\/li>\n<\/ul>\n<div align=\"center\"> <img src=\"pics\/111521118640738.gif\"\/> <\/div>\n<p><\/p>\n<h2>\u591a\u4e2a Candidate \u7ade\u9009<\/h2>\n<ul>\n<li>\u5982\u679c\u6709\u591a\u4e2a Follower \u6210\u4e3a Candidate\uff0c\u5e76\u4e14\u6240\u83b7\u5f97\u7968\u6570\u76f8\u540c\uff0c\u90a3\u4e48\u5c31\u9700\u8981\u91cd\u65b0\u5f00\u59cb\u6295\u7968\u3002\u4f8b\u5982\u4e0b\u56fe\u4e2d Node B \u548c Node D \u90fd\u83b7\u5f97\u4e24\u7968\uff0c\u9700\u8981\u91cd\u65b0\u5f00\u59cb\u6295\u7968\u3002<\/li>\n<\/ul>\n<div align=\"center\"> <img src=\"pics\/111521119203347.gif\"\/> <\/div>\n<p><\/p>\n<ul>\n<li>\u7531\u4e8e\u6bcf\u4e2a\u8282\u70b9\u8bbe\u7f6e\u7684\u968f\u673a\u7ade\u9009\u8d85\u65f6\u65f6\u95f4\u4e0d\u540c\uff0c\u56e0\u6b64\u4e0b\u4e00\u6b21\u518d\u6b21\u51fa\u73b0\u591a\u4e2a Candidate \u5e76\u83b7\u5f97\u540c\u6837\u7968\u6570\u7684\u6982\u7387\u5f88\u4f4e\u3002<\/li>\n<\/ul>\n<div align=\"center\"> <img src=\"pics\/111521119368714.gif\"\/> <\/div>\n<p><\/p>\n<h2>\u6570\u636e\u540c\u6b65<\/h2>\n<ul>\n<li>\u6765\u81ea\u5ba2\u6237\u7aef\u7684\u4fee\u6539\u90fd\u4f1a\u88ab\u4f20\u5165 Leader\u3002\u6ce8\u610f\u8be5\u4fee\u6539\u8fd8\u672a\u88ab\u63d0\u4ea4\uff0c\u53ea\u662f\u5199\u5165\u65e5\u5fd7\u4e2d\u3002<\/li>\n<\/ul>\n<div align=\"center\"> <img src=\"pics\/71550414107576.gif\"\/> <\/div>\n<p><\/p>\n<ul>\n<li>Leader \u4f1a\u628a\u4fee\u6539\u590d\u5236\u5230\u6240\u6709 Follower\u3002<\/li>\n<\/ul>\n<div align=\"center\"> <img src=\"pics\/91550414131331.gif\"\/> <\/div>\n<p><\/p>\n<ul>\n<li>Leader \u4f1a\u7b49\u5f85\u5927\u591a\u6570\u7684 Follower \u4e5f\u8fdb\u884c\u4e86\u4fee\u6539\uff0c\u7136\u540e\u624d\u5c06\u4fee\u6539\u63d0\u4ea4\u3002<\/li>\n<\/ul>\n<div align=\"center\"> <img src=\"pics\/101550414151983.gif\"\/> <\/div>\n<p><\/p>\n<ul>\n<li>\u6b64\u65f6 Leader \u4f1a\u901a\u77e5\u7684\u6240\u6709 Follower \u8ba9\u5b83\u4eec\u4e5f\u63d0\u4ea4\u4fee\u6539\uff0c\u6b64\u65f6\u6240\u6709\u8282\u70b9\u7684\u503c\u8fbe\u6210\u4e00\u81f4\u3002<\/li>\n<\/ul>\n<div align=\"center\"> <img src=\"pics\/111550414182638.gif\"\/> <\/div>\n<p><\/p>\n<h1>\u53c2\u8003<\/h1>\n<ul>\n<li>\u502a\u8d85. \u4ece Paxos \u5230 ZooKeeper : \u5206\u5e03\u5f0f\u4e00\u81f4\u6027\u539f\u7406\u4e0e\u5b9e\u8df5 [M]. \u7535\u5b50\u5de5\u4e1a\u51fa\u7248\u793e, 2015.<\/li>\n<li><a href=\"https:\/\/redis.io\/topics\/distlock\" target=\"_blank\" rel=\"noopener\">Distributed locks with Redis<\/a><\/li>\n<li><a href=\"http:\/\/www.linkedkeeper.com\/detail\/blog.action?bid=1023\" target=\"_blank\" rel=\"noopener\">\u6d45\u8c08\u5206\u5e03\u5f0f\u9501<\/a><\/li>\n<li><a href=\"http:\/\/www.dengshenyu.com\/java\/%E5%88%86%E5%B8%83%E5%BC%8F%E7%B3%BB%E7%BB%9F\/2017\/10\/23\/zookeeper-distributed-lock.html\" target=\"_blank\" rel=\"noopener\">\u57fa\u4e8e Zookeeper \u7684\u5206\u5e03\u5f0f\u9501<\/a><\/li>\n<li><a href=\"http:\/\/thesecretlivesofdata.com\/raft\" target=\"_blank\" rel=\"noopener\">Raft: Understandable Distributed Consensus<\/a><\/li>\n<li><a href=\"https:\/\/www.cnblogs.com\/savorboard\/p\/distributed-system-transaction-consistency.html\" target=\"_blank\" rel=\"noopener\">\u804a\u804a\u5206\u5e03\u5f0f\u4e8b\u52a1\uff0c\u518d\u8bf4\u8bf4\u89e3\u51b3\u65b9\u6848<\/a><\/li>\n<li><a href=\"https:\/\/coolshell.cn\/articles\/10910.html\" target=\"_blank\" rel=\"noopener\">\u5206\u5e03\u5f0f\u7cfb\u7edf\u7684\u4e8b\u52a1\u5904\u7406<\/a><\/li>\n<li><a href=\"https:\/\/juejin.im\/entry\/577c6f220a2b5800573492be\" target=\"_blank\" rel=\"noopener\">\u6df1\u5165\u7406\u89e3\u5206\u5e03\u5f0f\u4e8b\u52a1<\/a><\/li>\n<li><a href=\"http:\/\/www.colooshiki.com\/index.php\/2017\/04\/20\/what-is-cap-theorem-in-distributed-database-system\/\" target=\"_blank\" rel=\"noopener\">What is CAP theorem in distributed database system?<\/a><\/li>\n<li><a href=\"http:\/\/harry.me\/blog\/2014\/12\/27\/neat-algorithms-paxos\/\" target=\"_blank\" rel=\"noopener\">NEAT ALGORITHMS &#8211; PAXOS<\/a><\/li>\n<li><a href=\"https:\/\/angus.nyc\/2012\/paxos-by-example\/\" target=\"_blank\" rel=\"noopener\">Paxos By Example<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u53c2\u8003 \u4e00\u3001\u5206\u5e03\u5f0f\u9501 \u5728\u5355\u673a\u573a\u666f\u4e0b\uff0c\u53ef\u4ee5\u4f7f\u7528\u8bed\u8a00\u7684\u5185\u7f6e\u9501\u6765\u5b9e\u73b0\u8fdb\u7a0b\u540c\u6b65\u3002\u4f46\u662f\u5728\u5206\u5e03\u5f0f\u573a\u666f\u4e0b\uff0c\u9700\u8981\u540c\u6b65\u7684\u8fdb\u7a0b\u53ef\u80fd\u4f4d<a href=\"https:\/\/www.ccagml.com\/?p=277\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">\u5206\u5e03\u5f0f\u57fa\u7840\u77e5\u8bc6<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[18],"tags":[],"_links":{"self":[{"href":"https:\/\/www.ccagml.com\/index.php?rest_route=\/wp\/v2\/posts\/277"}],"collection":[{"href":"https:\/\/www.ccagml.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ccagml.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ccagml.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ccagml.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=277"}],"version-history":[{"count":3,"href":"https:\/\/www.ccagml.com\/index.php?rest_route=\/wp\/v2\/posts\/277\/revisions"}],"predecessor-version":[{"id":285,"href":"https:\/\/www.ccagml.com\/index.php?rest_route=\/wp\/v2\/posts\/277\/revisions\/285"}],"wp:attachment":[{"href":"https:\/\/www.ccagml.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=277"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ccagml.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=277"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ccagml.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=277"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}