{"id":201539,"date":"2025-05-10T08:31:22","date_gmt":"2025-05-10T00:31:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201539\/"},"modified":"2025-05-10T08:31:22","modified_gmt":"2025-05-10T00:31:22","slug":"redis%e5%ae%9e%e7%8e%b0%e5%88%86%e5%b8%83%e5%bc%8f%e9%94%81%e7%9a%84%e5%ae%9e%e4%be%8b%e8%ae%b2%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201539\/","title":{"rendered":"Redis\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u7684\u5b9e\u4f8b\u8bb2\u89e3"},"content":{"rendered":"

<\/b> <\/p>\n

Redis\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u7684\u5b9e\u4f8b\u8bb2\u89e3<\/h1>\n

<\/i>\u6536\u85cf<\/span> <\/p>\n

\u672c\u7bc7\u6587\u7ae0\u7ed9\u5927\u5bb6\u5206\u4eab\u300aRedis\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\u7684\u5b9e\u4f8b\u8bb2\u89e3\u300b\uff0c\u8986\u76d6\u4e86\u6570\u636e\u5e93\u7684\u5e38\u89c1\u57fa\u7840\u77e5\u8bc6\uff0c\u5176\u5b9e\u4e00\u4e2a\u8bed\u8a00\u7684\u5168\u90e8\u77e5\u8bc6\u70b9\u4e00\u7bc7\u6587\u7ae0\u662f\u4e0d\u53ef\u80fd\u8bf4\u5b8c\u7684\uff0c\u4f46\u5e0c\u671b\u901a\u8fc7\u8fd9\u4e9b\u95ee\u9898\uff0c\u8ba9\u8bfb\u8005\u5bf9\u81ea\u5df1\u7684\u638c\u63e1\u7a0b\u5ea6\u6709\u4e00\u5b9a\u7684\u8ba4\u8bc6(B \u6570)\uff0c\u4ece\u800c\u5f25\u8865\u81ea\u5df1\u7684\u4e0d\u8db3\uff0c\u66f4\u597d\u7684\u638c\u63e1\u5b83\u3002<\/p>\n

\u5728\u4e00\u4e2a\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\uff0c\u4f1a\u9047\u5230\u4e00\u4e9b\u9700\u8981\u5bf9\u591a\u4e2a\u8282\u70b9\u5171\u4eab\u7684\u8d44\u6e90\u52a0\u9501\u7684\u60c5\u51b5\uff0c\u8fd9\u4e2a\u65f6\u5019\u9700\u8981\u7528\u5230\u5206\u5e03\u5f0f\u9501\u3002\u5206\u5e03\u5f0f\u9501\u901a\u5e38\u4fdd\u5b58\u5728\u4e00\u4e2a\u5171\u4eab\u7684\u5b58\u50a8\u7cfb\u7edf\u4e2d\uff0c\u53ef\u4ee5\u88ab\u591a\u4e2a\u8282\u70b9\u5171\u4eab\u548c\u8bbf\u95ee\u3002<\/p>\n

\u9501\u7684\u672c\u8d28<\/h3>\n

\u7b80\u5355\u6765\u8bb2\uff0c\u9501\u53ef\u4ee5\u7528\u4e00\u4e2a\u53d8\u91cf\u6765\u8868\u793a\u3002\u6bd4\u5982\uff0c\u5728\u4e00\u4e2a\u5355\u673a\u591a\u7ebf\u7a0b\u7684\u7a0b\u5e8f\u6765\u8bf4\uff0c\u67d0\u4e2a\u8d44\u6e90\u7684\u9501\u7528\u4e00\u4e2a bit \u7684\u6570\u636e\u5c31\u53ef\u4ee5\u8868\u793a\u3002\u5373 0 \u8868\u793a\u6ca1\u6709\u8d44\u6e90\u53ef\u4ee5\u8bbf\u95ee\uff0c1 \u8868\u793a\u8d44\u6e90\u7684\u9501\u5df2\u88ab\u522b\u7684\u7ebf\u7a0b\u83b7\u53d6\uff0c\u4e0d\u80fd\u8bbf\u95ee\u3002<\/p>\n

\u83b7\u53d6\u548c\u91ca\u653e\u7279\u5b9a\u8d44\u6e90\u7684\u9501\uff0c\u672c\u8d28\u4e0a\u5c31\u662f\u4e3a\u83b7\u53d6\u548c\u4fee\u6539\u8fd9\u4e2a\u53d8\u91cf\u7684\u503c\u3002\u5982\u679c\u503c\u662f 0 \u5219\u5c06\u5176\u4fee\u6539\u4e3a 1\uff0c\u5c31\u5b8c\u6210\u4e86\u83b7\u53d6\u7684\u8fc7\u7a0b\uff0c\u5982\u679c\u8bbf\u95ee\u5230\u7684\u503c\u4e0d\u662f 0\uff0c\u5219\u83b7\u53d6\u9501\u5931\u8d25\uff1b\u5982\u679c\u4e4b\u524d\u83b7\u53d6\u4e86\u9501\uff0c\u5c06\u8868\u793a\u9501\u7684\u53d8\u91cf\u7684\u503c\u4fee\u6539\u4e3a 0 \u7684\u64cd\u4f5c\uff0c\u5176\u5b9e\u5c31\u662f\u91ca\u653e\u9501\u7684\u64cd\u4f5c\u3002<\/p>\n

\u5728\u4e00\u4e2a\u5206\u5e03\u5f0f\u573a\u666f\u4e2d\uff0c\u5b9e\u73b0\u9501\u7684\u65b9\u5f0f\u4e5f\u662f\u4e00\u6837\u7684\uff0c\u53ea\u4e0d\u8fc7\u8fd9\u4e2a\u8868\u793a\u8d44\u6e90\u9501\u7684\u53d8\u91cf\uff0c\u9700\u8981\u4fdd\u5b58\u5728\u4e00\u4e2a\u5171\u4eab\u7684\u5b58\u50a8\u7cfb\u7edf\u4e2d\u3002\u8fd9\u4e2a\u5171\u4eab\u7684\u5b58\u50a8\u7cfb\u7edf\uff0c\u53ef\u4ee5\u662f Redis\uff0c\u4e5f\u53ef\u4ee5\u662f\u5176\u4ed6\u7684\u4efb\u4f55\u53ef\u4ee5\u63d0\u4f9b\u6570\u636e\u5b58\u50a8\u7684\u7cfb\u7edf\u3002<\/p>\n

\u57fa\u4e8e Redis \u7684\u5206\u5e03\u5f0f\u9501\u5b9e\u73b0
<\/h3>\n

\u7b2c\u4e00\u6b65\uff1a\u521d\u6b65\u5b9e\u73b0\u529f\u80fd<\/strong><\/p>\n

\u5bf9\u4e8e\u5c06 Redis \u4f5c\u4e3a\u8fd9\u4e2a\u5171\u4eab\u5b58\u50a8\u7cfb\u7edf\u7684\u60c5\u51b5\u6765\u8bf4\uff0c\u4ee3\u8868\u67d0\u4e2a\u8d44\u6e90\u7684\u9501\u7684\u53d8\u91cf\uff0c\u5c31\u662f Redis \u4e2d\u7684\u4e00\u4e2a\u952e\u503c\u5bf9\u3002\u5047\u5982\uff0c\u9700\u8981\u6dfb\u52a0\u5206\u5e03\u5f0f\u9501\u7684\u8d44\u6e90\u53eb resource_a\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06 Redis \u4e2d resource_a \u7684\u9501\u53d8\u91cf\u7684 key \u53eb\u505a lock_a\u3002<\/p>\n

\u4f8b\u5982\uff0c\u8282\u70b9\u4e00\u9700\u8981\u83b7\u53d6\u9501\uff0c\u5b83\u4f1a\u8bbf\u95ee Redis \u4e2d lock_a \u7684\u503c\uff0c\u5047\u8bbe\u83b7\u53d6\u5230\u7684\u503c\u4e3a 0\uff0c\u5219\u8282\u70b9\u4e00\u5c06\u8fd9\u4e2a\u503c\u8bbe\u7f6e\u4e3a 1 \u540e\uff0c\u5c31\u5b8c\u6210\u4e86\u52a0\u9501\u64cd\u4f5c\u3002\u6b64\u65f6\uff0c\u8282\u70b9\u4e8c\u4e5f\u9700\u8981\u83b7\u53d6 resource_a \u7684\u9501\uff0c\u5b83\u53bb\u8bbf\u95ee Redis \u4e2d lock_a \u7684\u503c\uff0c\u53d1\u73b0\u503c\u662f 1\uff0c\u8bf4\u660e\u9501\u5df2\u7ecf\u88ab\u522b\u7684\u8282\u70b9\u83b7\u53d6\uff0c\u5e76\u4e14\u8fd8\u6ca1\u6709\u91ca\u653e\uff0c\u56e0\u6b64\uff0c\u8282\u70b9\u4e8c\u5bf9\u8d44\u6e90 resource_a \u52a0\u9501\u5931\u8d25\u3002<\/p>\n

\u5f53\u8282\u70b9\u4e00\u9700\u8981\u91ca\u653e\u9501\u7684\u65f6\u5019\uff0c\u53ea\u9700\u8981\u5c06 Redis \u4e2d\u7684 lock_a \u7684\u503c\u8bbe\u7f6e\u4e3a 0 \u5c31\u5b8c\u6210\u4e86\u9501\u7684\u91ca\u653e\uff0c\u4e4b\u540e\uff0c\u5176\u4ed6\u7684\u8282\u70b9\u5c31\u53ef\u4ee5\u518d\u6b21\u83b7\u53d6\u8d44\u6e90\u7684\u9501\u3002<\/p>\n

\u7b2c\u4e8c\u6b65\uff1a\u52a0\u9501\u64cd\u4f5c\u539f\u5b50\u5316<\/strong><\/p>\n

\u4ee5\u4e0a\u7684\u63cf\u8ff0\u4e2d\uff0c\u52a0\u9501\u7684\u5e76\u4e0d\u662f\u4e00\u4e2a\u5355\u4e00\u7684\u64cd\u4f5c\uff0c\u800c\u662f\u5305\u542b\u4e86\u591a\u4e2a\u6b65\u9aa4\uff1a\u8bfb\u53d6\u9501\u53d8\u91cf\u3001\u5224\u65ad\u53d8\u91cf\u7684\u503c\u3001\u4fee\u6539\u9501\u53d8\u91cf\u3002\u8fd9\u4e09\u4e2a\u64cd\u4f5c\u9700\u8981\u539f\u5b50\u5316\u3002<\/p>\n

\u5728 Redis \u4e2d\uff0c\u6709\u4e00\u4e2a SETNX \u547d\u4ee4\uff0c\u7528\u4e8e\u8bbe\u7f6e\u952e\u503c\u5bf9\u7684\u503c\uff0c\u4e0e SET \u547d\u4ee4\u4e0d\u540c\uff0c\u5b83\u5728\u662f\u5148\u4e8b\u4f1a\u5224\u65ad\u952e\u503c\u5bf9\u662f\u5426\u5b58\u5728\uff0c\u53ea\u6709\u5f53\u6307\u5b9a\u7684 KEY \u4e0d\u5b58\u5728\u7684\u65f6\u5019\uff0c\u624d\u4f1a\u6267\u884c\u503c\u7684\u8bbe\u5b9a\uff0c\u5426\u5219\u4ec0\u4e48\u90fd\u4e0d\u6267\u884c\u3002SETNX \u5c31\u662f\u300cSET if Not eXist\u300d\u7684\u610f\u601d\u3002\u5b83\u7684\u7528\u6cd5\u4e0e SET \u76f8\u540c\uff1a<\/p>\n

\nSETNX lock_a 1<\/pre>\n
\u8fd9\u6837\uff0c\u5f53\u9700\u8981\u83b7\u53d6\u9501\u7684\u65f6\u5019\uff0c\u4f7f\u7528 SETNX \u547d\u4ee4\u4e3a lock_a \u8bbe\u7f6e\u4e00\u4e2a\u503c\uff0c\u5982\u679c\u8bbe\u7f6e\u6210\u529f\u5219\u83b7\u53d6\u5230\u4e86\u9501\uff0c\u5982\u679c\u5931\u8d25\u5219\u6ca1\u6709\u83b7\u53d6\u5230\u9501\uff1b\u5f53\u9700\u8981\u91ca\u653e\u9501\u7684\u65f6\u5019\uff0c\u4f7f\u7528 DEL \u64cd\u4f5c\u5220\u9664\u952e\u503c\u5bf9\u5373\u53ef\u3002<\/p>\n
\u8fd9\u6837\u5c31\u5b9e\u73b0\u4e86\u83b7\u53d6\u548c\u91ca\u653e\u9501\u7684\u539f\u5b50\u5316\u64cd\u4f5c\u3002<\/p>\n
\u7b2c\u4e09\u6b65\uff1a\u9632\u6b62\u52a0\u9501\u540e\u4e0d\u91ca\u653e<\/strong><\/p>\n
\u63a5\u4e0b\u6765\u65e9\u8003\u8651\u4e00\u4e2a\u95ee\u9898\uff0c\u5982\u679c\u8282\u70b9\u4e00\u83b7\u53d6\u5230\u9501\u4e4b\u540e\uff0c\u7531\u4e8e\u7a0b\u5e8f\u5f02\u5e38\u7b49\u539f\u56e0\uff0c\u5bfc\u81f4\u4e00\u76f4\u4e48\u6709\u91ca\u653e\u9501\uff0c\u6b64\u65f6\uff0c\u9501\u4f1a\u4e00\u76f4\u88ab\u5b83\u6301\u6709\uff0c\u65e0\u6cd5\u91ca\u653e\uff0c\u5176\u4ed6\u8282\u70b9\u4e5f\u65e0\u6cd5\u8bbf\u95ee\u8d44\u6e90\u3002<\/p>\n
\u4e3a\u4e86\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\u7684\u53d1\u751f\uff0c\u6211\u4eec\u5fc5\u987b\u7ed9\u9501\u53d8\u91cf\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\uff0c\u5f53\u9501\u53d8\u91cf\u8fc7\u671f\u540e\uff0c\u5c31\u53ef\u4ee5\u91cd\u65b0\u8bf7\u6c42\u52a0\u9501\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u907f\u514d\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n
SETNX \u7684\u547d\u4ee4\u5e76\u6ca1\u6709\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\u7684\u9009\u9879\uff0c\u6240\u5e78\u7684\u662f\uff0cRedis \u4e3a SET \u547d\u4ee4\u63d0\u4f9b\u4e86\u6a21\u62df SETNX \u7684 NX \u9009\u9879\uff0c\u6211\u4eec\u53ef\u4ee5\u8fd9\u6837\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\uff1a<\/p>\n
\nSET lock_a 1 NX PX 10000<\/pre>\n
\u4ee5\u4e0a\u547d\u4ee4\u4ee3\u8868\uff0c\u5982\u679c lock_a \u4e0d\u5b58\u5728\uff0c\u5219\u5c06\u5b83\u7684\u503c\u8bbe\u7f6e\u4e3a 1\uff0c\u5e76\u4e14\u5728 10 \u79d2\u540e\u8fc7\u671f\u3002<\/p>\n
\u7b2c\u56db\u6b65\uff1a\u8c01\u52a0\u9501\u8c01\u91ca\u653e
<\/strong><\/p>\n
\u6700\u540e\u4e00\u4e2a\u95ee\u9898\u662f\uff0c\u5982\u679c\u8282\u70b9\u4e00\u83b7\u53d6\u4e86\u9501\uff0c\u800c\u7531\u4e8e\u67d0\u79cd\u539f\u56e0\uff0c\u8282\u70b9\u4e8c\u6267\u884c\u4e86 DEL \u64cd\u4f5c\uff0c\u90a3\u4e48\uff0c\u5176\u4ed6\u8282\u70b9\u53c8\u53ef\u4ee5\u83b7\u53d6\u9501\u4e86\u3002<\/p>\n
\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u53ef\u4ee5\u4fee\u6539\u4e00\u4e0b\u9501\u53d8\u91cf\u4fdd\u5b58\u7684\u5185\u5bb9\u3002\u5728\u524d\u9762\u7684\u903b\u8f91\u4e2d\uff0c\u6211\u4eec\u7533\u8bf7\u9501\u7684\u65f6\u5019\uff0c\u662f\u53bb\u5224\u65ad\u9501\u53d8\u91cf\u662f\u5426\u5b58\u5728\uff0c\u800c\u4e0e\u5176\u4e2d\u4fdd\u5b58\u7684\u503c\u5173\u7cfb\u4e0d\u5927\uff0c\u56e0\u6b64\uff0c\u6211\u4eec\u53ef\u4ee5\u628a\u8fd9\u4e2a\u503c\u5229\u7528\u8d77\u6765\u3002<\/p>\n
\u5728\u52a0\u9501\u7684\u65f6\u5019\uff0c\u5982\u679c\u628a\u503c\u4fdd\u5b58\u4e3a\u6bcf\u4e2a\u8282\u70b9\u552f\u4e00\u7684\u6807\u8bc6\uff0c\u90a3\u4e48\uff0c\u5728\u91ca\u653e\u9501\u6267\u884c DEL \u4e4b\u524d\u518d\u5bf9\u8fd9\u4e2a\u503c\u8fdb\u884c\u5224\u65ad\uff0c\u90a3\u4e48\uff0c\u5c31\u53ef\u4ee5\u5148\u5224\u65ad\u9501\u662f\u5426\u662f\u5f53\u524d\u8282\u70b9\u52a0\u4e0a\u7684\uff0c\u662f\u7684\u8bdd\u518d\u8fdb\u884c\u91ca\u653e\uff0c\u8fd9\u6837\u5c31\u5b9e\u73b0\u4e86\u300c\u8c01\u52a0\u9501\u8c01\u662f\u653e\u300d\u3002<\/p>\n
\u8fd9\u4e00\u90e8\u5206\uff0c\u6ca1\u6709\u4e00\u4e2a\u5355\u4e00\u7684\u6307\u4ee4\u53ef\u4ee5\u5b8c\u6210\u8bfb\u53d6\u9501\u53d8\u91cf\u3001\u5224\u65ad\u3001\u5220\u9664\u7684\u64cd\u4f5c\uff0c\u56e0\u6b64\uff0c\u53ef\u4ee5\u4f7f\u7528 Lua \u811a\u672c\u5b9e\u73b0\u3002\u5728\u811a\u672c\u4e2d\u83b7\u53d6\u5230\u5f53\u524d\u9501\u53d8\u91cf\u7684\u503c\uff0c\u4e0e\u7ed9\u5b9a\u7684\u8282\u70b9\u6807\u8bc6\u8fdb\u884c\u6bd4\u5bf9\uff0c\u7b26\u5408\u7684\u8bdd\u624d\u8fdb\u884c\u5220\u9664\u64cd\u4f5c\uff0c\u5426\u5219\u4e0d\u64cd\u4f5c\u3002<\/p>\n
\u5728\u91ca\u653e\u9501\u65f6\uff0c\u6267\u884c Lua \u811a\u672c\u5373\u53ef\u3002<\/p>\n
\u7b2c\u4e94\u6b65\uff1a\u5b9e\u73b0\u9ad8\u53ef\u7528<\/strong><\/p>\n
\u5b8c\u5584\u4e86\u529f\u80fd\u4e4b\u540e\uff0c\u6700\u540e\u518d\u6765\u5b9e\u73b0\u9ad8\u53ef\u7528\u3002\u5982\u679c\u6211\u4eec\u4f7f\u7528\u5355\u4e00\u7684 Redis \u4f5c\u4e3a\u5206\u5e03\u5f0f\u9501\u7684\u5171\u4eab\u5b58\u50a8\u7cfb\u7edf\uff0c\u90a3\u4e48\uff0c\u5982\u679c\u8fd9\u4e2a Redis \u4e0d\u53ef\u7528\u4e86\uff0c\u90a3\u6d89\u53ca\u5230\u5206\u5e03\u5f0f\u9501\u7684\u90e8\u5206\u90fd\u4e0d\u53ef\u7528\u4e86\uff0c\u8fd9\u6837\u662f\u5f88\u8106\u9501\u7684\uff0c\u8fd9\u662f\u9ad8\u53ef\u7528\u975e\u5e38\u6709\u5fc5\u8981\u7684\u539f\u56e0\u3002<\/p>\n
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