{"id":201438,"date":"2025-05-10T08:09:33","date_gmt":"2025-05-10T00:09:33","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201438\/"},"modified":"2025-05-10T08:09:33","modified_gmt":"2025-05-10T00:09:33","slug":"redis%e7%9a%84%e8%bf%99%e4%ba%9b%e4%ba%8b%e4%bd%a0%e7%9f%a5%e9%81%93%e5%90%97%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201438\/","title":{"rendered":"Redis\u7684\u8fd9\u4e9b\u4e8b\u4f60\u77e5\u9053\u5417\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>Redis\u7684\u8fd9\u4e9b\u4e8b\u4f60\u77e5\u9053\u5417\uff1f<\/h1>\n<p><span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p>\u6700\u8fd1\u53d1\u73b0\u4e0d\u5c11\u5c0f\u4f19\u4f34\u90fd\u5bf9<span style=\"color: #FF6600;font-family:\">\u6570\u636e\u5e93<\/span>\u5f88\u611f\u5174\u8da3\uff0c\u6240\u4ee5\u4eca\u5929\u7ee7\u7eed\u7ed9\u5927\u5bb6\u4ecb\u7ecd<span style=\"color: #FF6600;font-family:\">\u6570\u636e\u5e93<\/span>\u76f8\u5173\u7684\u77e5\u8bc6\uff0c\u672c\u6587<span style=\"color: #FF6600;font-family:\">\u300aRedis\u7684\u8fd9\u4e9b\u4e8b\u4f60\u77e5\u9053\u5417\uff1f\u300b<\/span>\u4e3b\u8981\u5185\u5bb9\u6d89\u53ca\u5230<span style=\"color: #FF6600;font-family:\">Redis\u3001\u6570\u636e\u5e93\u3001key-value<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u80fd\u5e2e\u5230\u4f60\uff01\u5f53\u7136\u5982\u679c\u9605\u8bfb\u672c\u6587\u65f6\u5b58\u5728\u4e0d\u540c\u60f3\u6cd5\uff0c\u53ef\u4ee5\u5728\u8bc4\u8bba\u4e2d\u8868\u8fbe\uff0c\u4f46\u662f\u8bf7\u52ff\u4f7f\u7528\u8fc7\u6fc0\u7684\u63aa\u8f9e~<\/p>\n<p><strong>\u5f15\u5b50<\/strong><\/p>\n<p>Redis &nbsp;\u662f\u4e00\u4e2a\u9ad8\u6027\u80fd\u5206\u5e03\u5f0f\u7684key-value\u6570\u636e\u5e93\u3002\u5b83\u652f\u6301\u591a\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u5e76\u53ef\u5e94\u7528\u4e8e\u7f13\u5b58\u3001\u961f\u5217\u7b49\u591a\u79cd\u573a\u666f\u4e0b\u3002\u4f7f\u7528\u8fc7Redis\u7684\u5c0f\u4f19\u4f34\u4eec\u53ef\u80fd\u5bf9\u8fd9\u4e9b\u5df2\u7ecf\u975e\u5e38\u719f\u77e5\u4e86\uff0c\u4e0b\u9762\u6211\u60f3\u6765\u8c08\u8c08Redis\u4e5f\u8bb8\u5e76\u4e0d\u88ab\u6bcf\u4e2a\u4eba\u4e86\u89e3\u7684\u90a3\u70b9\u4e8b\u3002<\/p>\n<\/p>\n<p><strong>Redis\u6301\u4e45\u5316\u673a\u5236<\/strong><\/p>\n<p>\u521a\u770b\u5230\u6807\u9898\u4f60\u53ef\u80fd\u4f1a\u8bf4\uff0c\u6211\u77e5\u9053\uff0c\u4e0d\u5c31\u662fRDB\u548cAOF\u561b\u3002\u8fd9\u4e9b\u5df2\u7ecf\u662f\u8001\u751f\u5e38\u8c08\u4e86\u3002\u90a3\u4e48\u6211\u4eec\u4eca\u5929\u5c31\u6df1\u5165\u8c08\u8c08\u8fd9\u4e24\u79cd\u6301\u4e45\u5316\u65b9\u5f0f\u7684\u903b\u8f91\u548c\u539f\u7406\u3002<\/p>\n<p><strong>RDB\u7684\u539f\u7406<\/strong><\/p>\n<p>\u5728Redis\u4e2dRDB\u6301\u4e45\u5316\u7684\u89e6\u53d1\u5206\u4e3a\u4e24\u79cd\uff1a\u81ea\u5df1\u624b\u52a8\u89e6\u53d1\u4e0eRedis\u5b9a\u65f6\u89e6\u53d1\u3002<\/p>\n<p>\u9488\u5bf9RDB\u65b9\u5f0f\u7684\u6301\u4e45\u5316\uff0c\u624b\u52a8\u89e6\u53d1\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<p>(1)save\uff1a\u4f1a\u963b\u585e\u5f53\u524dRedis\u670d\u52a1\u5668\uff0c\u76f4\u5230\u6301\u4e45\u5316\u5b8c\u6210\uff0c\u7ebf\u4e0a\u5e94\u8be5\u7981\u6b62\u4f7f\u7528\u3002<\/p>\n<p>(2)bgsave\uff1a\u8be5\u89e6\u53d1\u65b9\u5f0f\u4f1afork\u4e00\u4e2a\u5b50\u8fdb\u7a0b\uff0c\u7531\u5b50\u8fdb\u7a0b\u8d1f\u8d23\u6301\u4e45\u5316\u8fc7\u7a0b\uff0c\u56e0\u6b64\u963b\u585e\u53ea\u4f1a\u53d1\u751f\u5728fork\u5b50\u8fdb\u7a0b\u7684\u65f6\u5019\u3002<\/p>\n<p>\u800c\u81ea\u52a8\u89e6\u53d1\u7684\u573a\u666f\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li>\n<p>\u6839\u636e\u6211\u4eec\u7684 save m n \u914d\u7f6e\u89c4\u5219\u81ea\u52a8\u89e6\u53d1;<\/p>\n<\/li>\n<li>\n<p>\u4ece\u8282\u70b9\u5168\u91cf\u590d\u5236\u65f6\uff0c\u4e3b\u8282\u70b9\u53d1\u9001rdb\u6587\u4ef6\u7ed9\u4ece\u8282\u70b9\u5b8c\u6210\u590d\u5236\u64cd\u4f5c\uff0c\u4e3b\u8282\u70b9\u4f1a\u89e6\u53d1 bgsave;<\/p>\n<\/li>\n<li>\n<p>\u6267\u884c debug &nbsp;reload \u65f6\u5904\u7f5a;<\/p>\n<\/li>\n<li>\n<p>\u6267\u884c shutdown\u65f6\uff0c\u5982\u679c\u6ca1\u6709\u5f00\u542faof\uff0c\u4e5f\u4f1a\u89e6\u53d1\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u7531\u4e8e save \u57fa\u672c\u4e0d\u4f1a\u88ab\u4f7f\u7528\u5230\uff0c\u6211\u4eec\u6765\u770b\u770b bgsave \u8fd9\u4e2a\u547d\u4ee4\u662f\u5982\u4f55\u5b8c\u6210RDB\u7684\u6301\u4e45\u5316\u7684\u3002<\/p>\n<\/p>\n<p><strong>RDB\u6587\u4ef6\u4fdd\u5b58\u8fc7\u7a0b<\/strong><\/p>\n<p>(1)redis\u8c03\u7528fork,\u73b0\u5728\u6709\u4e86\u5b50\u8fdb\u7a0b\u548c\u7236\u8fdb\u7a0b\u3002<\/p>\n<p>(2)\u7236\u8fdb\u7a0b\u7ee7\u7eed\u5904\u7406client\u8bf7\u6c42\uff0c\u5b50\u8fdb\u7a0b\u8d1f\u8d23\u5c06\u5185\u5b58\u5185\u5bb9\u5199\u5165\u5230\u4e34\u65f6\u6587\u4ef6\u3002\u7531\u4e8eos\u7684\u5199\u65f6\u590d\u5236\u673a\u5236(copy &nbsp;on &nbsp;write)\u7236\u5b50\u8fdb\u7a0b\u4f1a\u5171\u4eab\u76f8\u540c\u7684\u7269\u7406\u9875\u9762\uff0c\u5f53\u7236\u8fdb\u7a0b\u5904\u7406\u5199\u8bf7\u6c42\u65f6os\u4f1a\u4e3a\u7236\u8fdb\u7a0b\u8981\u4fee\u6539\u7684\u9875\u9762\u521b\u5efa\u526f\u672c\uff0c\u800c\u4e0d\u662f\u5199\u5171\u4eab\u7684\u9875\u9762\u3002\u6240\u4ee5\u5b50\u8fdb\u7a0b\u7684\u5730\u5740\u7a7a\u95f4\u5185\u7684\u6570\u636e\u662ffork\u65f6\u523b\u6574\u4e2a\u6570\u636e\u5e93\u7684\u4e00\u4e2a\u5feb\u7167\u3002<\/p>\n<p>(3)\u5f53\u5b50\u8fdb\u7a0b\u5c06\u5feb\u7167\u5199\u5165\u4e34\u65f6\u6587\u4ef6\u5b8c\u6bd5\u540e\uff0c\u7528\u4e34\u65f6\u6587\u4ef6\u66ff\u6362\u539f\u6765\u7684\u5feb\u7167\u6587\u4ef6\uff0c\u7136\u540e\u5b50\u8fdb\u7a0b\u9000\u51fa\u3002<\/p>\n<p>PS\uff1afork &nbsp;\u64cd\u4f5c\u4f1a\u963b\u585e\uff0c\u5bfc\u81f4Redis\u8bfb\u5199\u6027\u80fd\u4e0b\u964d\u3002\u6211\u4eec\u53ef\u4ee5\u63a7\u5236\u5355\u4e2aRedis\u5b9e\u4f8b\u7684***\u5185\u5b58\uff0c\u6765\u5c3d\u53ef\u80fd\u964d\u4f4eRedis\u5728fork\u65f6\u7684\u65f6\u95f4\u6d88\u8017;\u6216\u8005\u63a7\u5236\u81ea\u52a8\u89e6\u53d1\u7684\u9891\u7387\u51cf\u5c11fork\u6b21\u6570\u3002<\/p>\n<p><strong>AOF\u7684\u539f\u7406<\/strong><\/p>\n<p>AOF\u7684\u6574\u4e2a\u6d41\u7a0b\u5927\u4f53\u6765\u770b\u53ef\u4ee5\u5206\u4e3a\u4e24\u6b65\uff0c\u4e00\u6b65\u662f\u547d\u4ee4\u7684\u5b9e\u65f6\u5199\u5165(\u5982\u679c\u662f appendfsync everysec &nbsp;\u914d\u7f6e\uff0c\u4f1a\u67091s\u635f\u8017)\uff0c\u7b2c\u4e8c\u6b65\u662f\u5bf9aof\u6587\u4ef6\u7684\u91cd\u5199\u3002<\/p>\n<p>\u5bf9\u4e8e\u589e\u91cf\u8ffd\u52a0\u5230\u6587\u4ef6\u8fd9\u4e00\u6b65\u4e3b\u8981\u7684\u6d41\u7a0b\u662f\uff1a<\/p>\n<p>(1)\u547d\u4ee4\u5199\u5165<\/p>\n<p>(2)\u8ffd\u52a0\u5230aof_buf<\/p>\n<p>(3)\u540c\u6b65\u5230aof\u78c1\u76d8<\/p>\n<p>\u90a3\u4e48\u8fd9\u91cc\u4e3a\u4ec0\u4e48\u8981\u5148\u5199\u5165buf\u518d\u540c\u6b65\u5230\u78c1\u76d8\u5462?\u5982\u679c\u5b9e\u65f6\u5199\u5165\u78c1\u76d8\u4f1a\u5e26\u6765\u975e\u5e38\u9ad8\u7684\u78c1\u76d8IO\uff0c\u5f71\u54cd\u6574\u4f53\u6027\u80fd\u3002<\/p>\n<p><strong>AOF\u91cd\u5199<\/strong><\/p>\n<p>\u4f60\u53ef\u4ee5\u4f1a\u60f3\uff0c\u6bcf\u4e00\u6761\u5199\u547d\u4ee4\u90fd\u751f\u6210\u4e00\u6761\u65e5\u5fd7\uff0c\u90a3\u4e48AOF\u6587\u4ef6\u662f\u4e0d\u662f\u4f1a\u5f88\u5927?\u7b54\u6848\u662f\u80af\u5b9a\u7684\uff0cAOF\u6587\u4ef6\u4f1a\u8d8a\u6765\u8d8a\u5927\uff0c\u6240\u4ee5Redis\u53c8\u63d0\u4f9b\u4e86\u4e00\u4e2a\u529f\u80fd\uff0c\u53eb\u505aAOF &nbsp;rewrite\u3002\u5176\u529f\u80fd\u5c31\u662f\u91cd\u65b0\u751f\u6210\u4e00\u4efdAOF\u6587\u4ef6\uff0c\u65b0\u7684AOF\u6587\u4ef6\u4e2d\u4e00\u6761\u8bb0\u5f55\u7684\u64cd\u4f5c\u53ea\u4f1a\u6709\u4e00\u6b21\uff0c\u800c\u4e0d\u50cf\u4e00\u4efd\u8001\u6587\u4ef6\u90a3\u6837\uff0c\u53ef\u80fd\u8bb0\u5f55\u4e86\u5bf9\u540c\u4e00\u4e2a\u503c\u7684\u591a\u6b21\u64cd\u4f5c\u3002<\/p>\n<p>\u624b\u52a8\u89e6\u53d1\uff1a bgrewriteaof<\/p>\n<p>\u81ea\u52a8\u89e6\u53d1\u5c31\u662f\u6839\u636e\u914d\u7f6e\u89c4\u5219\u6765\u89e6\u53d1\uff0c\u5f53\u7136\u81ea\u52a8\u89e6\u53d1\u7684\u6574\u4f53\u65f6\u95f4\u8fd8\u8ddfRedis\u7684\u5b9a\u65f6\u4efb\u52a1\u9891\u7387\u6709\u5173\u7cfb\u3002<\/p>\n<p>\u4e0b\u9762\u6765\u770b\u770b\u91cd\u5199\u7684\u6d41\u7a0b\u56fe\uff1a&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230113\/167359091163c0f87f67f1d.jpg\" style=\"max-width:100%\" class=\"aligncenter\"><br \/>\n <\/p>\n<p>(1)redis\u8c03\u7528fork &nbsp;\uff0c\u73b0\u5728\u6709\u7236\u5b50\u4e24\u4e2a\u8fdb\u7a0b<\/p>\n<p>(2)\u5b50\u8fdb\u7a0b\u6839\u636e\u5185\u5b58\u4e2d\u7684\u6570\u636e\u5e93\u5feb\u7167\uff0c\u5f80\u4e34\u65f6\u6587\u4ef6\u4e2d\u5199\u5165\u91cd\u5efa\u6570\u636e\u5e93\u72b6\u6001\u7684\u547d\u4ee4<\/p>\n<p>(3)\u7236\u8fdb\u7a0b\u7ee7\u7eed\u5904\u7406client\u8bf7\u6c42\uff0c\u9664\u4e86\u628a\u5199\u547d\u4ee4\u5199\u5165\u5230\u539f\u6765\u7684aof\u6587\u4ef6\u4e2d\u3002\u540c\u65f6\u628a\u6536\u5230\u7684\u5199\u547d\u4ee4\u7f13\u5b58\u8d77\u6765\u3002\u8fd9\u6837\u5c31\u80fd\u4fdd\u8bc1\u5982\u679c\u5b50\u8fdb\u7a0b\u91cd\u5199\u5931\u8d25\u7684\u8bdd\u5e76\u4e0d\u4f1a\u51fa\u95ee\u9898\u3002<\/p>\n<p>(4)\u5f53\u5b50\u8fdb\u7a0b\u628a\u5feb\u7167\u5185\u5bb9\u5199\u5230\u4e34\u65f6\u6587\u4ef6\u4e2d\u540e\uff0c\u5b50\u8fdb\u7a0b\u53d1\u4fe1\u53f7\u901a\u77e5\u7236\u8fdb\u7a0b\u3002\u7136\u540e\u7236\u8fdb\u7a0b\u628a\u7f13\u5b58\u7684\u5199\u547d\u4ee4\u4e5f\u5199\u5165\u5230\u4e34\u65f6\u6587\u4ef6\u3002<\/p>\n<p>(5)\u73b0\u5728\u7236\u8fdb\u7a0b\u53ef\u4ee5\u4f7f\u7528\u4e34\u65f6\u6587\u4ef6\u66ff\u6362\u8001\u7684aof\u6587\u4ef6\uff0c\u5e76\u91cd\u547d\u540d\uff0c\u540e\u9762\u6536\u5230\u7684\u5199\u547d\u4ee4\u4e5f\u5f00\u59cb\u5f80\u65b0\u7684aof\u6587\u4ef6\u4e2d\u8ffd\u52a0\u3002<\/p>\n<p>PS\uff1a\u9700\u8981\u6ce8\u610f\u5230\u662f\u91cd\u5199aof\u6587\u4ef6\u7684\u64cd\u4f5c\uff0c\u5e76\u6ca1\u6709\u8bfb\u53d6\u65e7\u7684aof\u6587\u4ef6\uff0c\u800c\u662f\u5c06\u6574\u4e2a\u5185\u5b58\u4e2d\u7684\u6570\u636e\u5e93\u5185\u5bb9\u7528\u547d\u4ee4\u7684\u65b9\u5f0f\u91cd\u5199\u4e86\u4e00\u4e2a\u65b0\u7684aof\u6587\u4ef6,\u8fd9\u70b9\u548c\u5feb\u7167\u6709\u70b9\u7c7b\u4f3c\u3002<\/p>\n<p><strong>Redis\u4e3a\u4ec0\u4e48\u8fd9\u4e48\u5feb?<\/strong><\/p>\n<p>Redis\u91c7\u7528\u7684\u662f\u57fa\u4e8e\u5185\u5b58\u7684\u5355\u8fdb\u7a0b\u5355\u7ebf\u7a0b\u6a21\u578b\u7684 KV &nbsp;\u6570\u636e\u5e93\uff0c\u7531C\u8bed\u8a00\u7f16\u5199\uff0c\u5b98\u65b9\u63d0\u4f9b\u7684\u6570\u636e\u662f\u53ef\u4ee5\u8fbe\u5230100000+\u7684QPS(\u6bcf\u79d2\u5185\u67e5\u8be2\u6b21\u6570)\u3002\u8fd9\u4e2a\u6570\u636e\u4e0d\u6bd4\u91c7\u7528\u5355\u8fdb\u7a0b\u591a\u7ebf\u7a0b\u7684\u540c\u6837\u57fa\u4e8e\u5185\u5b58\u7684 KV \u6570\u636e\u5e93 &nbsp;Memcached \u5dee!\u539f\u56e0\u5982\u4e0b\uff1a<\/p>\n<p>1\u3001\u5b8c\u5168\u57fa\u4e8e\u5185\u5b58\uff0c\u7edd\u5927\u90e8\u5206\u8bf7\u6c42\u662f\u7eaf\u7cb9\u7684\u5185\u5b58\u64cd\u4f5c\uff0c\u975e\u5e38\u5feb\u901f;<\/p>\n<p>2\u3001\u6570\u636e\u7ed3\u6784\u7b80\u5355\uff0c\u5bf9\u6570\u636e\u64cd\u4f5c\u4e5f\u7b80\u5355\uff0cRedis\u4e2d\u7684\u6570\u636e\u7ed3\u6784\u662f\u4e13\u95e8\u8fdb\u884c\u8bbe\u8ba1\u7684;<\/p>\n<p>3\u3001\u91c7\u7528\u5355\u7ebf\u7a0b\uff0c\u907f\u514d\u4e86\u4e0d\u5fc5\u8981\u7684\u4e0a\u4e0b\u6587\u5207\u6362\u548c\u7ade\u4e89\u6761\u4ef6\uff0c\u4e5f\u4e0d\u5b58\u5728\u591a\u8fdb\u7a0b\u6216\u8005\u591a\u7ebf\u7a0b\u5bfc\u81f4\u7684\u5207\u6362\u800c\u6d88\u8017CPU\uff0c\u4e0d\u7528\u53bb\u8003\u8651\u5404\u79cd\u9501\u7684\u95ee\u9898\uff0c\u4e0d\u5b58\u5728\u52a0\u9501\u91ca\u653e\u9501\u7684\u64cd\u4f5c\uff0c\u4e5f\u4e0d\u53ef\u80fd\u51fa\u73b0\u6b7b\u9501\u800c\u5bfc\u81f4\u7684\u6027\u80fd\u6d88\u8017;<\/p>\n<p>4\u3001\u4f7f\u7528\u591a\u8defI\/O\u590d\u7528\u6a21\u578b\uff0c\u975e\u963b\u585eIO;<\/p>\n<p>5\u3001\u4f7f\u7528\u7684\u5e95\u5c42\u6a21\u578b\u4e0d\u540c\uff0c\u5e95\u5c42\u5b9e\u73b0\u65b9\u5f0f\u4ee5\u53ca\u4e0e\u5ba2\u6237\u7aef\u4e4b\u95f4\u901a\u4fe1\u7684\u5e94\u7528\u534f\u8bae\u4e0d\u4e00\u6837\uff0cRedis\u76f4\u63a5\u6784\u5efa\u4e86\u81ea\u5df1\u7684VM\u673a\u5236\u3002<\/p>\n<p><strong>\u591a\u8defI\/O\u590d\u7528\u6a21\u578b<\/strong><\/p>\n<p>\u591a\u8defI\/O\u590d\u7528\u6a21\u578b\u662f\u5229\u7528 select\u3001poll\u3001epoll \u53ef\u4ee5\u540c\u65f6\u76d1\u5bdf\u591a\u4e2a\u6d41\u7684 I\/O &nbsp;\u4e8b\u4ef6\u7684\u80fd\u529b\uff0c\u5728\u7a7a\u95f2\u7684\u65f6\u5019\uff0c\u4f1a\u628a\u5f53\u524d\u7ebf\u7a0b\u963b\u585e\u6389\uff0c\u5f53\u6709\u4e00\u4e2a\u6216\u591a\u4e2a\u6d41\u6709 I\/O \u4e8b\u4ef6\u65f6\uff0c\u5c31\u4ece\u963b\u585e\u6001\u4e2d\u5524\u9192\uff0c\u4e8e\u662f\u7a0b\u5e8f\u5c31\u4f1a\u8f6e\u8be2\u4e00\u904d\u6240\u6709\u7684\u6d41(epoll &nbsp;\u662f\u53ea\u8f6e\u8be2\u90a3\u4e9b\u771f\u6b63\u53d1\u51fa\u4e86\u4e8b\u4ef6\u7684\u6d41)\uff0c\u5e76\u4e14\u53ea\u4f9d\u6b21\u987a\u5e8f\u7684\u5904\u7406\u5c31\u7eea\u7684\u6d41\uff0c\u8fd9\u79cd\u505a\u6cd5\u5c31\u907f\u514d\u4e86\u5927\u91cf\u7684\u65e0\u7528\u64cd\u4f5c\u3002\u8fd9\u91cc\u201c\u591a\u8def\u201d\u6307\u7684\u662f\u591a\u4e2a\u7f51\u7edc\u8fde\u63a5\uff0c\u201c\u590d\u7528\u201d\u6307\u7684\u662f\u590d\u7528\u540c\u4e00\u4e2a\u7ebf\u7a0b\u3002\u91c7\u7528\u591a\u8def &nbsp;I\/O \u590d\u7528\u6280\u672f\u53ef\u4ee5\u8ba9\u5355\u4e2a\u7ebf\u7a0b\u9ad8\u6548\u7684\u5904\u7406\u591a\u4e2a\u8fde\u63a5\u8bf7\u6c42(\u5c3d\u91cf\u51cf\u5c11\u7f51\u7edc IO \u7684\u65f6\u95f4\u6d88\u8017)\u3002<\/p>\n<p><strong>Redis\u4e8b\u52a1<\/strong><\/p>\n<p>Redis\u4e2d\u7684\u4e8b\u52a1(transaction)\u662f\u4e00\u7ec4\u547d\u4ee4\u7684\u96c6\u5408\u3002\u4e8b\u52a1\u540c\u547d\u4ee4\u4e00\u6837\u90fd\u662fRedis\u6700\u5c0f\u7684\u6267\u884c\u5355\u4f4d\uff0c\u4e00\u4e2a\u4e8b\u52a1\u4e2d\u7684\u547d\u4ee4\u8981\u4e48\u90fd\u6267\u884c\uff0c\u8981\u4e48\u90fd\u4e0d\u6267\u884c\u3002Redis\u4e8b\u52a1\u7684\u5b9e\u73b0\u9700\u8981 &nbsp;MULTI \u548c EXEC \u4e24\u4e2a\u547d\u4ee4\uff0c\u4e8b\u52a1\u5f00\u59cb\u7684\u65f6\u5019\u5148\u5411Redis\u670d\u52a1\u5668\u53d1\u9001 MULTI \u547d\u4ee4\uff0c\u7136\u540e\u4f9d\u6b21\u53d1\u9001\u9700\u8981\u5728\u672c\u6b21\u4e8b\u52a1\u4e2d\u5904\u7406\u7684\u547d\u4ee4\uff0c***\u518d\u53d1\u9001 EXEC &nbsp;\u547d\u4ee4\u8868\u793a\u4e8b\u52a1\u547d\u4ee4\u7ed3\u675f\u3002<\/p>\n<p>\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u4f7f\u7528redis-cli\u8fde\u63a5redis\uff0c\u7136\u540e\u5728\u547d\u4ee4\u884c\u5de5\u5177\u4e2d\u8f93\u5165\u5982\u4e0b\u547d\u4ee4\uff1a&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230113\/167359091163c0f87faaa31.jpg\" style=\"max-width:100%\" class=\"aligncenter\"><br \/>\n <\/p>\n<p>\u4ece\u8f93\u51fa\u4e2d\u53ef\u4ee5\u770b\u5230\uff0c\u5f53\u8f93\u5165MULTI\u547d\u4ee4\u540e\uff0c\u670d\u52a1\u5668\u8fd4\u56deOK\u8868\u793a\u4e8b\u52a1\u5f00\u59cb\u6210\u529f\uff0c\u7136\u540e\u4f9d\u6b21\u8f93\u5165\u9700\u8981\u5728\u672c\u6b21\u4e8b\u52a1\u4e2d\u6267\u884c\u7684\u6240\u6709\u547d\u4ee4\uff0c\u6bcf\u6b21\u8f93\u5165\u4e00\u4e2a\u547d\u4ee4\u670d\u52a1\u5668\u5e76\u4e0d\u4f1a\u9a6c\u4e0a\u6267\u884c\uff0c\u800c\u662f\u8fd4\u56de\u201dQUEUED\u201d\uff0c\u8fd9\u8868\u793a\u547d\u4ee4\u5df2\u7ecf\u88ab\u670d\u52a1\u5668\u63a5\u53d7\u5e76\u4e14\u6682\u65f6\u4fdd\u5b58\u8d77\u6765\uff0c***\u8f93\u5165EXEC\u547d\u4ee4\u540e\uff0c\u672c\u6b21\u4e8b\u52a1\u4e2d\u7684\u6240\u6709\u547d\u4ee4\u624d\u4f1a\u88ab\u4f9d\u6b21\u6267\u884c\uff0c\u53ef\u4ee5\u770b\u5230***\u670d\u52a1\u5668\u4e00\u6b21\u6027\u8fd4\u56de\u4e86\u4e09\u4e2aOK\uff0c\u8fd9\u91cc\u8fd4\u56de\u7684\u7ed3\u679c\u4e0e\u53d1\u9001\u7684\u547d\u4ee4\u662f\u6309\u987a\u5e8f\uff0c\u8fd9\u8bf4\u660e\u8fd9\u6b21\u4e8b\u52a1\u4e2d\u7684\u547d\u4ee4\u5168\u90fd\u6267\u884c\u6210\u529f\u4e86\u3002<\/p>\n<p>\u518d\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u5728\u547d\u4ee4\u884c\u5de5\u5177\u4e2d\u8f93\u5165\u5982\u4e0b\u547d\u4ee4\uff1a&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230113\/167359091263c0f88022a3c.jpg\" style=\"max-width:100%\" class=\"aligncenter\"><br \/>\n <\/p>\n<p>\u548c\u524d\u9762\u7684\u4f8b\u5b50\u4e00\u6837\uff0c\u5148\u8f93\u5165MULTI***\u8f93\u5165EXEC\u8868\u793a\u4e2d\u95f4\u7684\u547d\u4ee4\u5c5e\u4e8e\u4e00\u4e2a\u4e8b\u52a1\uff0c\u4e0d\u540c\u7684\u662f\u4e2d\u95f4\u8f93\u5165\u7684\u547d\u4ee4\u6709\u4e00\u4e2a\u9519\u8bef(set\u5199\u6210\u4e86sett)\uff0c\u8fd9\u6837\u56e0\u4e3a\u6709\u4e00\u4e2a\u9519\u8bef\u7684\u547d\u4ee4\u5bfc\u81f4\u4e8b\u52a1\u4e2d\u7684\u5176\u4ed6\u547d\u4ee4\u90fd\u4e0d\u6267\u884c\u4e86\uff0c\u53ef\u89c1\u4e8b\u52a1\u4e2d\u7684\u6240\u6709\u547d\u4ee4\u662f\u4fdd\u6301\u4e00\u81f4\u7684\u3002<\/p>\n<p>\u5982\u679c\u5ba2\u6237\u7aef\u5728\u53d1\u9001EXEC\u547d\u4ee4\u4e4b\u524d\u65ad\u7ebf\u4e86\uff0c\u5219\u670d\u52a1\u5668\u4f1a\u6e05\u7a7a\u4e8b\u52a1\u961f\u5217\uff0c\u4e8b\u52a1\u4e2d\u7684\u6240\u6709\u547d\u4ee4\u90fd\u4e0d\u4f1a\u88ab\u6267\u884c\u3002\u800c\u4e00\u65e6\u5ba2\u6237\u7aef\u53d1\u9001\u4e86EXEC\u547d\u4ee4\u4e4b\u540e\uff0c\u4e8b\u52a1\u4e2d\u7684\u6240\u6709\u547d\u4ee4\u90fd\u4f1a\u88ab\u6267\u884c\uff0c\u5373\u4f7f\u6b64\u540e\u5ba2\u6237\u7aef\u65ad\u7ebf\u4e5f\u6ca1\u5173\u7cfb\uff0c\u56e0\u4e3a\u670d\u52a1\u5668\u5df2\u7ecf\u4fdd\u5b58\u4e86\u4e8b\u52a1\u4e2d\u7684\u6240\u6709\u547d\u4ee4\u3002<\/p>\n<p>\u9664\u4e86\u4fdd\u8bc1\u4e8b\u52a1\u4e2d\u7684\u6240\u6709\u547d\u4ee4\u8981\u4e48\u5168\u6267\u884c\u8981\u4e48\u5168\u4e0d\u6267\u884c\u5916\uff0cRedis\u7684\u4e8b\u52a1\u8fd8\u80fd\u4fdd\u8bc1\u4e00\u4e2a\u4e8b\u52a1\u4e2d\u7684\u547d\u4ee4\u4f9d\u6b21\u6267\u884c\u800c\u4e0d\u4f1a\u88ab\u5176\u4ed6\u547d\u4ee4\u63d2\u5165\u3002\u8bd5\u60f3\u4e00\u4e2a\u5ba2\u6237\u7aefA\u9700\u8981\u6267\u884c\u51e0\u6761\u547d\u4ee4\uff0c\u540c\u65f6\u5ba2\u6237\u7aefB\u53d1\u9001\u4e86\u51e0\u6761\u547d\u4ee4\uff0c\u5982\u679c\u4e0d\u4f7f\u7528\u4e8b\u52a1\uff0c\u5219\u5ba2\u6237\u7aefB\u7684\u547d\u4ee4\u6709\u53ef\u80fd\u4f1a\u63d2\u5165\u5230\u5ba2\u6237\u7aefA\u7684\u51e0\u6761\u547d\u4ee4\u4e2d\uff0c\u5982\u679c\u60f3\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\u53d1\u751f\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u4e8b\u52a1\u3002<\/p>\n<p><strong>Redis\u4e8b\u52a1\u9519\u8bef\u5904\u7406<\/strong><\/p>\n<p>\u5982\u679c\u4e00\u4e2a\u4e8b\u52a1\u4e2d\u7684\u67d0\u4e2a\u547d\u4ee4\u6267\u884c\u51fa\u9519\uff0cRedis\u4f1a\u600e\u6837\u5904\u7406\u5462?\u8981\u56de\u7b54\u8fd9\u4e2a\u95ee\u9898\uff0c\u9996\u5148\u8981\u641e\u6e05\u695a\u662f\u4ec0\u4e48\u539f\u56e0\u5bfc\u81f4\u547d\u4ee4\u6267\u884c\u51fa\u9519\uff1a<\/p>\n<p>1.\u8bed\u6cd5\u9519\u8bef:\u5c31\u50cf\u4e0a\u9762\u7684\u4f8b\u5b50\u4e00\u6837\uff0c\u8bed\u6cd5\u9519\u8bef\u8868\u793a\u547d\u4ee4\u4e0d\u5b58\u5728\u6216\u8005\u53c2\u6570\u9519\u8bef\uff0c\u8fd9\u79cd\u60c5\u51b5\u9700\u8981\u533a\u5206Redis\u7684\u7248\u672c\uff0cRedis &nbsp;2.6.5\u4e4b\u524d\u7684\u7248\u672c\u4f1a\u5ffd\u7565\u9519\u8bef\u7684\u547d\u4ee4\uff0c\u6267\u884c\u5176\u4ed6\u6b63\u786e\u7684\u547d\u4ee4\uff0c2.6.5\u4e4b\u540e\u7684\u7248\u672c\u4f1a\u5ffd\u7565\u8fd9\u4e2a\u4e8b\u52a1\u4e2d\u7684\u6240\u6709\u547d\u4ee4\uff0c\u90fd\u4e0d\u6267\u884c<\/p>\n<p>2.\u8fd0\u884c\u9519\u8bef &nbsp;\u8fd0\u884c\u9519\u8bef\u8868\u793a\u547d\u4ee4\u5728\u6267\u884c\u8fc7\u7a0b\u4e2d\u51fa\u73b0\u9519\u8bef\uff0c\u6bd4\u5982\u7528GET\u547d\u4ee4\u83b7\u53d6\u4e00\u4e2a\u6563\u5217\u8868\u7c7b\u578b\u7684\u952e\u503c\u3002\u8fd9\u79cd\u9519\u8bef\u5728\u547d\u4ee4\u6267\u884c\u4e4b\u524dRedis\u662f\u65e0\u6cd5\u53d1\u73b0\u7684\uff0c\u6240\u4ee5\u5728\u4e8b\u52a1\u91cc\u8fd9\u6837\u7684\u547d\u4ee4\u4f1a\u88abRedis\u63a5\u53d7\u5e76\u6267\u884c\u3002\u5982\u679c\u98df\u7269\u91cc\u6709\u4e00\u6761\u547d\u4ee4\u6267\u884c\u9519\u8bef\uff0c\u5176\u4ed6\u547d\u4ee4\u4f9d\u65e7\u4f1a\u6267\u884c(\u5305\u62ec\u51fa\u9519\u4e4b\u540e\u7684\u547d\u4ee4)\u3002&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230113\/167359091263c0f880627e8.jpg\" style=\"max-width:100%\" class=\"aligncenter\"><br \/>\n <\/p>\n<p>Redis\u4e2d\u7684\u4e8b\u52a1\u5e76\u6ca1\u6709\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4e2d\u7684\u4e8b\u52a1\u56de\u6eda(rollback)\u529f\u80fd\uff0c\u56e0\u6b64\u4f7f\u7528\u8005\u5fc5\u987b\u81ea\u5df1\u6536\u62fe\u5269\u4e0b\u7684\u70c2\u644a\u5b50\u3002\u4e0d\u8fc7\u7531\u4e8eRedis\u4e0d\u652f\u6301\u4e8b\u52a1\u56de\u6eda\u529f\u80fd\uff0c\u8fd9\u4e5f\u4f7f\u5f97Redis\u7684\u4e8b\u52a1\u7b80\u6d01\u5feb\u901f\u3002<\/p>\n<p><strong>WATCH\u3001UNWATCH\u3001DISCARD\u547d\u4ee4<\/strong><\/p>\n<p>\u4ece\u4e0a\u9762\u7684\u4f8b\u5b50\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u4e8b\u52a1\u4e2d\u7684\u547d\u4ee4\u8981\u5168\u90e8\u6267\u884c\u5b8c\u4e4b\u540e\u624d\u80fd\u83b7\u53d6\u6bcf\u4e2a\u547d\u4ee4\u7684\u7ed3\u679c\uff0c\u4f46\u662f\u5982\u679c\u4e00\u4e2a\u4e8b\u52a1\u4e2d\u7684\u547d\u4ee4B\u4f9d\u8d56\u4e8e\u4ed6\u4e0a\u4e00\u4e2a\u547d\u4ee4A\u7684\u7ed3\u679c\u7684\u8bdd\u8be5\u600e\u4e48\u529e\u5462?\u5c31\u6bd4\u5982\u8bf4\u5b9e\u73b0\u7c7b\u4f3cJava\u4e2d\u7684i++\u7684\u529f\u80fd\uff0c\u5148\u8981\u83b7\u53d6\u5f53\u524d\u503c\uff0c\u624d\u80fd\u5728\u5f53\u524d\u503c\u7684\u57fa\u7840\u4e0a\u505a\u52a0\u4e00\u64cd\u4f5c\u3002\u8fd9\u79cd\u573a\u5408\u4ec5\u4ec5\u4f7f\u7528\u4e0a\u9762\u4ecb\u7ecd\u7684MULTI\u548cEXEC\u662f\u4e0d\u80fd\u5b9e\u73b0\u7684\uff0c\u56e0\u4e3aMULTI\u548cEXEC\u4e2d\u7684\u547d\u4ee4\u662f\u4e00\u8d77\u6267\u884c\u7684\uff0c\u5e76\u4e0d\u80fd\u5c06\u5176\u4e2d\u4e00\u6761\u547d\u4ee4\u7684\u6267\u884c\u7ed3\u679c\u4f5c\u4e3a\u53e6\u4e00\u6761\u547d\u4ee4\u7684\u6267\u884c\u53c2\u6570\uff0c\u6240\u4ee5\u8fd9\u4e2a\u65f6\u5019\u5c31\u9700\u8981\u5f15\u8fdbRedis\u4e8b\u52a1\u5bb6\u65cf\u4e2d\u7684\u53e6\u4e00\u6210\u5458\uff1aWATCH\u547d\u4ee4\u3002<\/p>\n<p>\u6362\u4e2a\u89d2\u5ea6\u601d\u8003\u4e0a\u9762\u8bf4\u5230\u7684\u5b9e\u73b0i++\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u8fd9\u6837\u5b9e\u73b0\uff1a<\/p>\n<ul>\n<li>\n<p>\u76d1\u63a7i\u7684\u503c\uff0c\u4fdd\u8bc1i\u7684\u503c\u4e0d\u88ab\u4fee\u6539<\/p>\n<\/li>\n<li>\n<p>\u83b7\u53d6i\u7684\u539f\u503c<\/p>\n<\/li>\n<li>\n<p>\u5982\u679c\u8fc7\u7a0b\u4e2di\u7684\u503c\u6ca1\u6709\u88ab\u4fee\u6539\uff0c\u5219\u5c06\u5f53\u524d\u7684i\u503c+1\uff0c\u5426\u5219\u4e0d\u6267\u884c<\/p>\n<\/li>\n<\/ul>\n<p>WATCH\u547d\u4ee4\u53ef\u4ee5\u76d1\u63a7\u4e00\u4e2a\u6216\u591a\u4e2a\u952e\uff0c\u4e00\u65e6\u5176\u4e2d\u6709\u4e00\u4e2a\u952e\u88ab\u4fee\u6539(\u6216\u5220\u9664)\uff0c\u4e4b\u540e\u7684\u4e8b\u52a1\u5c31\u4e0d\u4f1a\u6267\u884c\uff0c\u76d1\u63a7\u4e00\u76f4\u6301\u7eed\u5230EXEC\u547d\u4ee4(\u4e8b\u52a1\u4e2d\u7684\u547d\u4ee4\u662f\u5728EXEC\u4e4b\u540e\u624d\u6267\u884c\u7684\uff0cEXEC\u547d\u4ee4\u6267\u884c\u5b8c\u4e4b\u540e\u88ab\u76d1\u63a7\u7684\u952e\u4f1a\u81ea\u52a8\u88abUNWATCH)\u3002\u4e3e\u4e2a\u4f8b\u5b50\uff1a&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230113\/167359091263c0f880ade18.jpg\" style=\"max-width:100%\" class=\"aligncenter\"><br \/>\n <\/p>\n<p>\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u9996\u5148\u8bbe\u7f6emykey\u7684\u952e\u503c\u4e3a1\uff0c\u7136\u540e\u4f7f\u7528WATCH\u547d\u4ee4\u76d1\u63a7mykey\uff0c\u968f\u540e\u66f4\u6539mykey\u7684\u503c\u4e3a2\uff0c\u7136\u540e\u8fdb\u5165\u4e8b\u52a1\uff0c\u4e8b\u52a1\u4e2d\u8bbe\u7f6emykey\u7684\u503c\u4e3a3\uff0c\u7136\u540e\u6267\u884cEXEC\u8fd0\u884c\u4e8b\u52a1\u4e2d\u7684\u547d\u4ee4\uff0c***\u4f7f\u7528get\u547d\u4ee4\u67e5\u770bmykey\u7684\u503c\uff0c\u53d1\u73b0mykey\u7684\u503c\u8fd8\u662f2\uff0c\u4e5f\u5c31\u662f\u8bf4\u4e8b\u52a1\u4e2d\u7684\u547d\u4ee4\u6839\u672c\u6ca1\u6709\u6267\u884c(\u56e0\u4e3aWATCH\u76d1\u63a7mykey\u7684\u8fc7\u7a0b\u4e2d\uff0cmykey\u88ab\u4fee\u6539\u4e86\uff0c\u6240\u4ee5\u968f\u540e\u7684\u4e8b\u52a1\u4fbf\u4f1a\u88ab\u53d6\u6d88)\u3002<\/p>\n<p>UNWATCH\u547d\u4ee4\u53ef\u4ee5\u5728WATCH\u547d\u4ee4\u6267\u884c\u4e4b\u540e\u3001MULTI\u547d\u4ee4\u6267\u884c\u4e4b\u524d\u53d6\u6d88\u5bf9\u67d0\u4e2a\u952e\u7684\u76d1\u63a7\u3002\u4e3e\u4e2a\u4f8b\u5b50\uff1a&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230113\/167359091263c0f880e971a.jpg\" style=\"max-width:100%\" class=\"aligncenter\"><br \/>\n <\/p>\n<p>\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u9996\u5148\u8bbe\u7f6emykey\u7684\u952e\u503c\u4e3a1\uff0c\u7136\u540e\u4f7f\u7528WATCH\u547d\u4ee4\u76d1\u63a7mykey\uff0c\u968f\u540e\u66f4\u6539mykey\u7684\u503c\u4e3a2\uff0c\u7136\u540e\u53d6\u6d88\u5bf9mykey\u7684\u76d1\u63a7\uff0c\u518d\u8fdb\u5165\u4e8b\u52a1\uff0c\u4e8b\u52a1\u4e2d\u8bbe\u7f6emykey\u7684\u503c\u4e3a3\uff0c\u7136\u540e\u6267\u884cEXEC\u8fd0\u884c\u4e8b\u52a1\u4e2d\u7684\u547d\u4ee4\uff0c***\u4f7f\u7528get\u547d\u4ee4\u67e5\u770bmykey\u7684\u503c\uff0c\u53d1\u73b0mykey\u7684\u503c\u8fd8\u662f3\uff0c\u4e5f\u5c31\u662f\u8bf4\u4e8b\u52a1\u4e2d\u7684\u547d\u4ee4\u8fd0\u884c\u6210\u529f\u3002<\/p>\n<p>DISCARD\u547d\u4ee4\u5219\u53ef\u4ee5\u5728MULTI\u547d\u4ee4\u6267\u884c\u4e4b\u540e\uff0cEXEC\u547d\u4ee4\u6267\u884c\u4e4b\u524d\u53d6\u6d88WATCH\u547d\u4ee4\u5e76\u6e05\u7a7a\u4e8b\u52a1\u961f\u5217\uff0c\u7136\u540e\u4ece\u4e8b\u52a1\u72b6\u6001\u4e2d\u9000\u51fa\u3002\u4e3e\u4e2a\u4f8b\u5b50\uff1a&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20230113\/167359091363c0f8812ec84.jpg\" style=\"max-width:100%\" class=\"aligncenter\"><br \/>\n <\/p>\n<p>\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u9996\u5148\u8bbe\u7f6emykey\u7684\u952e\u503c\u4e3a1\uff0c\u7136\u540e\u4f7f\u7528WATCH\u547d\u4ee4\u76d1\u63a7mykey\uff0c\u968f\u540e\u66f4\u6539mykey\u7684\u503c\u4e3a2\uff0c\u7136\u540e\u8fdb\u5165\u4e8b\u52a1\uff0c\u4e8b\u52a1\u4e2d\u8bbe\u7f6emykey\u7684\u503c\u4e3a3\uff0c\u7136\u540e\u6267\u884cDISCARD\u547d\u4ee4\uff0c\u518d\u6267\u884cEXEC\u8fd0\u884c\u4e8b\u52a1\u4e2d\u7684\u547d\u4ee4\uff0c\u53d1\u73b0\u62a5\u9519\u201cERR &nbsp;EXEC without MULTI\u201d\uff0c\u8bf4\u660eDISCARD\u547d\u4ee4\u6210\u529f\u6267\u884c\u2014\u2014\u53d6\u6d88WATCH\u547d\u4ee4\u5e76\u6e05\u7a7a\u4e8b\u52a1\u961f\u5217\uff0c\u7136\u540e\u4ece\u4e8b\u52a1\u72b6\u6001\u4e2d\u9000\u51fa\u3002<\/p>\n<p><strong>Redis\u5206\u5e03\u5f0f\u9501<\/strong><\/p>\n<p>\u4e0a\u9762\u4ecb\u7ecd\u7684Redis\u7684WATCH\u3001MULTI\u548cEXEC\u547d\u4ee4\uff0c\u53ea\u4f1a\u5728\u6570\u636e\u88ab\u5176\u4ed6\u5ba2\u6237\u7aef\u62a2\u5148\u4fee\u6539\u7684\u60c5\u51b5\u4e0b\uff0c\u901a\u77e5\u6267\u884c\u8fd9\u4e9b\u547d\u4ee4\u7684\u5ba2\u6237\u7aef\uff0c\u8ba9\u5b83\u64a4\u9500\u5bf9\u6570\u636e\u7684\u4fee\u6539\u64cd\u4f5c\uff0c\u5e76\u4e0d\u80fd\u963b\u6b62\u5176\u4ed6\u5ba2\u6237\u7aef\u5bf9\u6570\u636e\u8fdb\u884c\u4fee\u6539\uff0c\u6240\u4ee5\u53ea\u80fd\u79f0\u4e4b\u4e3a\u4e50\u89c2\u9501(optimistic &nbsp;locking)\u3002<\/p>\n<p>\u800c\u8fd9\u79cd\u4e50\u89c2\u9501\u5e76\u4e0d\u5177\u5907\u53ef\u6269\u5c55\u6027\u2014\u2014\u5f53\u5ba2\u6237\u7aef\u5c1d\u8bd5\u5b8c\u6210\u4e00\u4e2a\u4e8b\u52a1\u7684\u65f6\u5019\uff0c\u53ef\u80fd\u4f1a\u56e0\u4e3a\u4e8b\u52a1\u6267\u884c\u5931\u8d25\u800c\u8fdb\u884c\u53cd\u590d\u7684\u91cd\u8bd5\u3002\u4fdd\u8bc1\u6570\u636e\u51c6\u786e\u6027\u975e\u5e38\u91cd\u8981\uff0c\u4f46\u662f\u5f53\u8d1f\u8f7d\u53d8\u5927\u7684\u65f6\u5019\uff0c\u4f7f\u7528\u4e50\u89c2\u9501\u7684\u505a\u6cd5\u5e76\u4e0d***\u3002\u8fd9\u65f6\u5c31\u9700\u8981\u4f7f\u7528Redis\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u3002<\/p>\n<p>\u5206\u5e03\u5f0f\u9501\uff1a\u662f\u63a7\u5236\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e4b\u95f4\u540c\u6b65\u8bbf\u95ee\u5171\u4eab\u8d44\u6e90\u7684\u4e00\u79cd\u65b9\u5f0f\u3002\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\uff0c\u5e38\u5e38\u9700\u8981\u534f\u8c03\u4ed6\u4eec\u7684\u52a8\u4f5c\u3002\u5982\u679c\u4e0d\u540c\u7684\u7cfb\u7edf\u6216\u662f\u540c\u4e00\u4e2a\u7cfb\u7edf\u7684\u4e0d\u540c\u4e3b\u673a\u4e4b\u95f4\u5171\u4eab\u4e86\u4e00\u4e2a\u6216\u4e00\u7ec4\u8d44\u6e90\uff0c\u90a3\u4e48\u8bbf\u95ee\u8fd9\u4e9b\u8d44\u6e90\u7684\u65f6\u5019\uff0c\u5f80\u5f80\u9700\u8981\u4e92\u65a5\u6765\u9632\u6b62\u5f7c\u6b64\u5e72\u6270\u6765\u4fdd\u8bc1\u4e00\u81f4\u6027\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u4fbf\u9700\u8981\u4f7f\u7528\u5230\u5206\u5e03\u5f0f\u9501\u3002<\/p>\n<p><strong>Redis\u547d\u4ee4\u4ecb\u7ecd\uff1a<\/strong><\/p>\n<p>Redis\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u4e3b\u8981\u7528\u5230\u547d\u4ee4\u662fSETNX\u547d\u4ee4(SET if Not eXists)\u3002<\/p>\n<ul>\n<li>\n<p>\u8bed\u6cd5\uff1aSETNX key value<\/p>\n<\/li>\n<li>\n<p>\u529f\u80fd\uff1a\u5f53\u4e14\u4ec5\u5f53 key \u4e0d\u5b58\u5728\uff0c\u5c06 key \u7684\u503c\u8bbe\u4e3a value \uff0c\u5e76\u8fd4\u56de1;\u82e5\u7ed9\u5b9a\u7684 key \u5df2\u7ecf\u5b58\u5728\uff0c\u5219 SETNX \u4e0d\u505a\u4efb\u4f55\u52a8\u4f5c\uff0c\u5e76\u8fd4\u56de0\u3002<\/p>\n<\/li>\n<\/ul>\n<p><strong>\u4f7f\u7528Redis\u6784\u5efa\u9501\uff1a<\/strong><\/p>\n<p>\u601d\u8def\uff1a\u5c06\u201clock:\u201d+\u53c2\u6570\u540d\u8bbe\u7f6e\u4e3a\u9501\u7684\u952e\uff0c\u4f7f\u7528SETNX\u547d\u4ee4\u5c1d\u8bd5\u5c06\u4e00\u4e2a\u968f\u673a\u7684uuid\u8bbe\u7f6e\u4e3a\u9501\u7684\u503c\uff0c\u5e76\u4e3a\u9501\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\uff0c\u4f7f\u7528SETNX\u8bbe\u7f6e\u9501\u7684\u503c\u53ef\u4ee5\u9632\u6b62\u9501\u88ab\u5176\u4ed6\u8fdb\u7a0b\u83b7\u53d6\u3002\u5982\u679c\u5c1d\u8bd5\u83b7\u53d6\u9501\u7684\u65f6\u5019\u5931\u8d25\uff0c\u90a3\u4e48\u7a0b\u5e8f\u5c06\u4e0d\u65ad\u91cd\u8bd5\uff0c\u76f4\u5230\u6210\u529f\u83b7\u53d6\u9501\u6216\u8005\u8d85\u8fc7\u7ed9\u5b9a\u662f\u65f6\u9650\u4e3a\u6b62\u3002<\/p>\n<p>\u4ee3\u7801\uff1a<\/p>\n<\/p>\n<pre>public&nbsp;String&nbsp;acquireLockWithTimeout(&nbsp;\r\n&nbsp;Jedis&nbsp;conn,&nbsp;String&nbsp;lockName,&nbsp;long&nbsp;acquireTimeout,&nbsp;long&nbsp;lockTimeout)&nbsp;\r\n&nbsp;String&nbsp;identifier&nbsp;=&nbsp;UUID.randomUUID().toString();&nbsp;\/\/\u9501\u7684\u503c&nbsp;\r\n&nbsp;String&nbsp;lockKey&nbsp;=&nbsp;\"lock:\"&nbsp;+&nbsp;lockName;&nbsp;\/\/\u9501\u7684\u952e&nbsp;\r\n&nbsp;int&nbsp;lockExpire&nbsp;=&nbsp;(int)(lockTimeout&nbsp;\/&nbsp;1000);&nbsp;\/\/\u9501\u7684\u8fc7\u671f\u65f6\u95f4&nbsp;\r\n&nbsp;long&nbsp;end&nbsp;=&nbsp;System.currentTimeMillis()&nbsp;+&nbsp;acquireTimeout;&nbsp;\/\/\u5c1d\u8bd5\u83b7\u53d6\u9501\u7684\u65f6\u9650&nbsp;\r\n&nbsp;while&nbsp;(System.currentTimeMillis()&nbsp;<p><\/p><p>\u9501\u7684\u91ca\u653e\uff1a<\/p><p>\u601d\u8def\uff1a\u4f7f\u7528WATCH\u547d\u4ee4\u76d1\u89c6\u4ee3\u8868\u9501\u7684\u952e\uff0c\u7136\u540e\u68c0\u67e5\u952e\u7684\u503c\u662f\u5426\u548c\u52a0\u9501\u65f6\u8bbe\u7f6e\u7684\u503c\u76f8\u540c\uff0c\u5e76\u5728\u786e\u8ba4\u503c\u6ca1\u6709\u53d8\u5316\u540e\u5220\u9664\u8be5\u952e\u3002<\/p><p>\u4ee3\u7801\uff1a<\/p><p><\/p><pre>public&nbsp;boolean&nbsp;releaseLock(Jedis&nbsp;conn,&nbsp;String&nbsp;lockName,&nbsp;String&nbsp;identifier)&nbsp;{&nbsp;\r\n&nbsp;String&nbsp;lockKey&nbsp;=&nbsp;\"lock:\"&nbsp;+&nbsp;lockName;&nbsp;\/\/\u9501\u7684\u952e&nbsp;\r\n&nbsp;while&nbsp;(true){&nbsp;\r\n&nbsp;conn.watch(lockKey);&nbsp;\/\/\u76d1\u89c6\u9501\u7684\u952e&nbsp;\r\n&nbsp;if&nbsp;(identifier.equals(conn.get(lockKey))){&nbsp;\/\/\u5224\u65ad\u9501\u7684\u503c\u662f\u5426\u548c\u52a0\u9501\u65f6\u8bbe\u7f6e\u7684\u4e00\u81f4\uff0c\u5373\u68c0\u67e5\u8fdb\u7a0b\u662f\u5426\u4ecd\u7136\u6301\u6709\u9501&nbsp;\r\n&nbsp;Transaction&nbsp;trans&nbsp;=&nbsp;conn.multi();&nbsp;\r\n&nbsp;trans.del(lockKey);&nbsp;\/\/\u5728Redis\u4e8b\u52a1\u4e2d\u91ca\u653e\u9501&nbsp;\r\n&nbsp;List&nbsp;results&nbsp;=&nbsp;trans.exec();&nbsp;\r\n&nbsp;if&nbsp;(results&nbsp;==&nbsp;null){&nbsp;&nbsp;\r\n&nbsp;continue;&nbsp;\/\/\u4e8b\u52a1\u6267\u884c\u5931\u8d25\u540e\u91cd\u8bd5\uff08\u76d1\u89c6\u7684\u952e\u88ab\u4fee\u6539\u5bfc\u81f4\u4e8b\u52a1\u5931\u8d25\uff0c\u91cd\u65b0\u76d1\u89c6\u5e76\u91ca\u653e\u9501\uff09&nbsp;\r\n&nbsp;return&nbsp;true;&nbsp;\r\n&nbsp;conn.unwatch();&nbsp;\/\/\u89e3\u9664\u76d1\u89c6&nbsp;\r\n&nbsp;break;&nbsp;\r\n&nbsp;return&nbsp;false;<\/pre>\n<\/p>\n<p>&nbsp;\u3010\u7f16\u8f91\u63a8\u8350\u3011<\/p>\n<ol>\n<li>\n<\/li>\n<li>\n<\/li>\n<li>\n<\/li>\n<li>\n<\/li>\n<li>\n<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>Redis\u7684\u8fd9\u4e9b\u4e8b\u4f60\u77e5\u9053\u5417\uff1f \u6536&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-201438","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201438","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=201438"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201438\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=201438"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=201438"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=201438"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}