{"id":97630,"date":"2024-10-20T19:37:20","date_gmt":"2024-10-20T11:37:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/97630\/"},"modified":"2024-10-20T19:37:21","modified_gmt":"2024-10-20T11:37:21","slug":"redis-%e5%81%9a%e5%88%86%e4%bd%88%e5%bc%8f%e9%8e%96%e4%bd%a0%e6%9c%83%e5%b9%be%e7%a8%ae%e5%a7%bf%e5%8b%a2%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/97630\/","title":{"rendered":"Redis \u505a\u5206\u4f48\u5f0f\u9396\u4f60\u6703\u5e7e\u7a2e\u59ff\u52e2\uff1f"},"content":{"rendered":"<h1 id=\"redis-%e5%81%9a%e5%88%86%e4%bd%88%e5%bc%8f%e9%8e%96%e4%bd%a0%e6%9c%83%e5%b9%be%e7%a8%ae%e5%a7%bf%e5%8b%a2%ef%bc%9f-byeMSdpQzP\">Redis \u505a\u5206\u4f48\u5f0f\u9396\u4f60\u6703\u5e7e\u7a2e\u59ff\u52e2\uff1f<\/h1>\n<p>\u5728\u73fe\u4ee3\u7684\u5206\u4f48\u5f0f\u7cfb\u7d71\u4e2d\uff0c\u8cc7\u6e90\u7684\u7af6\u722d\u548c\u5354\u8abf\u662f\u975e\u5e38\u91cd\u8981\u7684\u554f\u984c\u3002\u70ba\u4e86\u89e3\u6c7a\u9019\u4e9b\u554f\u984c\uff0c\u5206\u4f48\u5f0f\u9396\u6210\u70ba\u4e86\u4e00\u500b\u5e38\u898b\u7684\u89e3\u6c7a\u65b9\u6848\u3002Redis \u4f5c\u70ba\u4e00\u500b\u9ad8\u6548\u7684\u9375\u503c\u5b58\u5132\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u5f0f\u4f86\u5be6\u73fe\u5206\u4f48\u5f0f\u9396\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5e7e\u7a2e\u4f7f\u7528 Redis \u5be6\u73fe\u5206\u4f48\u5f0f\u9396\u7684\u59ff\u52e2\u3002<\/p>\n<h2 id=\"1-%e5%9f%ba%e6%96%bc-setnx-%e5%91%bd%e4%bb%a4%e7%9a%84%e9%8e%96-byeMSdpQzP\">1. \u57fa\u65bc SETNX \u547d\u4ee4\u7684\u9396<\/h2>\n<p>\u6700\u57fa\u672c\u7684\u5206\u4f48\u5f0f\u9396\u5be6\u73fe\u65b9\u5f0f\u662f\u4f7f\u7528 Redis \u7684 <code>SETNX<\/code> \u547d\u4ee4\u3002\u9019\u500b\u547d\u4ee4\u7684\u5168\u540d\u662f &#8220;SET if Not eXists&#8221;\uff0c\u5b83\u7684\u4f5c\u7528\u662f\u7576\u9375\u4e0d\u5b58\u5728\u6642\u8a2d\u7f6e\u9375\u7684\u503c\uff0c\u4e26\u8fd4\u56de 1\uff1b\u5982\u679c\u9375\u5df2\u7d93\u5b58\u5728\uff0c\u5247\u8fd4\u56de 0\u3002<\/p>\n<pre><code>SETNX lock_key unique_lock_value\n<\/code><\/pre>\n<p>\u5728\u9019\u7a2e\u5be6\u73fe\u4e2d\uff0c\u7576\u4e00\u500b\u9032\u7a0b\u60f3\u8981\u7372\u53d6\u9396\u6642\uff0c\u5b83\u6703\u5617\u8a66\u57f7\u884c <code>SETNX<\/code> \u547d\u4ee4\u3002\u5982\u679c\u8fd4\u56de\u503c\u70ba 1\uff0c\u5247\u8868\u793a\u7372\u53d6\u9396\u6210\u529f\uff1b\u5982\u679c\u8fd4\u56de\u503c\u70ba 0\uff0c\u5247\u8868\u793a\u9396\u5df2\u88ab\u5176\u4ed6\u9032\u7a0b\u6301\u6709\u3002<\/p>\n<h3 id=\"%e9%8e%96%e7%9a%84%e9%87%8b%e6%94%be-byeMSdpQzP\">\u9396\u7684\u91cb\u653e<\/h3>\n<p>\u5728\u91cb\u653e\u9396\u6642\uff0c\u5fc5\u9808\u78ba\u4fdd\u53ea\u6709\u6301\u6709\u9396\u7684\u9032\u7a0b\u624d\u80fd\u91cb\u653e\u5b83\u3002\u9019\u53ef\u4ee5\u901a\u904e\u6aa2\u67e5\u9396\u7684\u503c\u4f86\u5be6\u73fe\uff1a<\/p>\n<pre><code>if (get(lock_key) == unique_lock_value) {\n    del(lock_key);\n}\n<\/code><\/pre>\n<h2 id=\"2-%e4%bd%bf%e7%94%a8-redisson-%e5%af%a6%e7%8f%be%e9%8e%96-byeMSdpQzP\">2. \u4f7f\u7528 Redisson \u5be6\u73fe\u9396<\/h2>\n<p>Redisson \u662f\u4e00\u500b\u57fa\u65bc Redis \u7684 Java \u5ba2\u6236\u7aef\uff0c\u63d0\u4f9b\u4e86\u66f4\u9ad8\u5c64\u6b21\u7684\u62bd\u8c61\u4f86\u5be6\u73fe\u5206\u4f48\u5f0f\u9396\u3002\u4f7f\u7528 Redisson\uff0c\u53ef\u4ee5\u8f15\u9b06\u5730\u7372\u53d6\u548c\u91cb\u653e\u9396\uff0c\u4e26\u4e14\u5b83\u9084\u652f\u6301\u9396\u7684\u81ea\u52d5\u904e\u671f\u3002<\/p>\n<pre><code>RLock lock = redisson.getLock(\"lock_key\");\nlock.lock();\ntry {\n    \/\/ \u57f7\u884c\u9700\u8981\u9396\u4fdd\u8b77\u7684\u64cd\u4f5c\n} finally {\n    lock.unlock();\n}\n<\/code><\/pre>\n<p>\u9019\u7a2e\u65b9\u5f0f\u7684\u512a\u9ede\u5728\u65bc\uff0cRedisson \u81ea\u52d5\u8655\u7406\u4e86\u9396\u7684\u904e\u671f\u548c\u91cb\u653e\uff0c\u6e1b\u5c11\u4e86\u958b\u767c\u8005\u7684\u8ca0\u64d4\u3002<\/p>\n<h2 id=\"3-%e4%bd%bf%e7%94%a8-lua-%e8%85%b3%e6%9c%ac%e5%af%a6%e7%8f%be%e9%8e%96-byeMSdpQzP\">3. \u4f7f\u7528 Lua \u8173\u672c\u5be6\u73fe\u9396<\/h2>\n<p>\u53e6\u4e00\u7a2e\u5be6\u73fe\u5206\u4f48\u5f0f\u9396\u7684\u65b9\u5f0f\u662f\u4f7f\u7528 Lua \u8173\u672c\u3002\u9019\u7a2e\u65b9\u5f0f\u53ef\u4ee5\u78ba\u4fdd\u9396\u7684\u7372\u53d6\u548c\u91cb\u653e\u64cd\u4f5c\u662f\u539f\u5b50\u6027\u7684\uff0c\u5f9e\u800c\u907f\u514d\u4e86\u7af6\u722d\u689d\u4ef6\u3002<\/p>\n<pre><code>\nlocal lock_key = KEYS[1]\nlocal unique_lock_value = ARGV[1]\nif redis.call(\"SETNX\", lock_key, unique_lock_value) == 1 then\n    return true\nelse\n    return false\nend\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u8173\u672c\u4e2d\uff0c\u9996\u5148\u6aa2\u67e5\u9396\u662f\u5426\u5b58\u5728\uff0c\u5982\u679c\u4e0d\u5b58\u5728\u5247\u8a2d\u7f6e\u9396\u4e26\u8fd4\u56de true\uff1b\u5982\u679c\u5df2\u5b58\u5728\u5247\u8fd4\u56de false\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u9396\u7684\u7372\u53d6\u662f\u539f\u5b50\u64cd\u4f5c\u3002<\/p>\n<h3 id=\"%e9%8e%96%e7%9a%84%e9%87%8b%e6%94%be-byeMSdpQzP\">\u9396\u7684\u91cb\u653e<\/h3>\n<p>\u91cb\u653e\u9396\u7684 Lua \u8173\u672c\u4e5f\u53ef\u4ee5\u985e\u4f3c\u5730\u5be6\u73fe\uff1a<\/p>\n<pre><code>\nif redis.call(\"GET\", lock_key) == ARGV[1] then\n    return redis.call(\"DEL\", lock_key)\nend\n<\/code><\/pre>\n<h2 id=\"4-%e4%bd%bf%e7%94%a8-redlock-%e7%ae%97%e6%b3%95-byeMSdpQzP\">4. \u4f7f\u7528 Redlock \u7b97\u6cd5<\/h2>\n<p>Redlock \u662f\u7531 Redis \u7684\u5275\u59cb\u4eba Antirez \u63d0\u51fa\u7684\u5206\u4f48\u5f0f\u9396\u7b97\u6cd5\uff0c\u9069\u7528\u65bc\u591a\u500b Redis \u5be6\u4f8b\u7684\u60c5\u6cc1\u3002\u9019\u7a2e\u7b97\u6cd5\u7684\u6838\u5fc3\u601d\u60f3\u662f\u901a\u904e\u591a\u500b Redis \u5be6\u4f8b\u4f86\u63d0\u9ad8\u9396\u7684\u53ef\u9760\u6027\u3002<\/p>\n<p>Redlock \u7684\u57fa\u672c\u6b65\u9a5f\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li>\u5728 N \u500b Redis \u5be6\u4f8b\u4e2d\u7372\u53d6\u9396\u3002<\/li>\n<li>\u78ba\u4fdd\u5728\u5927\u591a\u6578\u5be6\u4f8b\u4e2d\u6210\u529f\u7372\u53d6\u9396\u3002<\/li>\n<li>\u8a2d\u7f6e\u9396\u7684\u904e\u671f\u6642\u9593\u3002<\/li>\n<li>\u91cb\u653e\u9396\u6642\uff0c\u78ba\u4fdd\u53ea\u6709\u6301\u6709\u9396\u7684\u9032\u7a0b\u624d\u80fd\u91cb\u653e\u3002<\/li>\n<\/ul>\n<p>\u9019\u7a2e\u65b9\u5f0f\u80fd\u5920\u6709\u6548\u5730\u907f\u514d\u55ae\u9ede\u6545\u969c\uff0c\u63d0\u9ad8\u7cfb\u7d71\u7684\u53ef\u7528\u6027\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-byeMSdpQzP\">\u7e3d\u7d50<\/h2>\n<p>Redis \u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u5f0f\u4f86\u5be6\u73fe\u5206\u4f48\u5f0f\u9396\uff0c\u5305\u62ec\u57fa\u65bc <code>SETNX<\/code> \u547d\u4ee4\u7684\u7c21\u55ae\u5be6\u73fe\u3001\u4f7f\u7528 Redisson \u7684\u9ad8\u5c64\u6b21\u62bd\u8c61\u3001Lua \u8173\u672c\u7684\u539f\u5b50\u64cd\u4f5c\u4ee5\u53ca Redlock \u7b97\u6cd5\u7684\u591a\u5be6\u4f8b\u652f\u6301\u3002\u6839\u64da\u5177\u9ad4\u7684\u9700\u6c42\u548c\u5834\u666f\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u9078\u64c7\u6700\u5408\u9069\u7684\u65b9\u5f0f\u4f86\u5be6\u73fe\u5206\u4f48\u5f0f\u9396\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u6216\u5176\u4ed6\u4f3a\u670d\u5668\u89e3\u6c7a\u65b9\u6848\u611f\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 Redis \u5206\u4f48\u5f0f\u9396\u7684\u591a\u7a2e\u5be6\u73fe\u65b9\u5f0f\uff0c\u4e86\u89e3\u5982\u4f55\u6709\u6548\u7ba1\u7406\u8cc7\u6e90\u8207\u907f\u514d\u7af6\u722d\u689d\u4ef6\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-97630","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/97630","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"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=97630"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/97630\/revisions"}],"predecessor-version":[{"id":97631,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/97630\/revisions\/97631"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=97630"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=97630"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=97630"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}