{"id":128353,"date":"2024-10-26T13:32:18","date_gmt":"2024-10-26T05:32:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/128353\/"},"modified":"2024-10-26T13:32:18","modified_gmt":"2024-10-26T05:32:18","slug":"redis-%e5%af%a6%e7%8f%be%e7%9a%84%e9%96%93%e9%9a%99%e9%8e%96%e5%8f%af%e9%9d%a0%e6%80%a7%e6%96%b0%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%a1%88","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/128353\/","title":{"rendered":"Redis \u5be6\u73fe\u7684\u9593\u9699\u9396\u53ef\u9760\u6027\u65b0\u89e3\u6c7a\u65b9\u6848"},"content":{"rendered":"<h1 id=\"redis-%e5%af%a6%e7%8f%be%e7%9a%84%e9%96%93%e9%9a%99%e9%8e%96%e5%8f%af%e9%9d%a0%e6%80%a7%e6%96%b0%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%a1%88-NGxRyuqbTS\">Redis \u5be6\u73fe\u7684\u9593\u9699\u9396\u53ef\u9760\u6027\u65b0\u89e3\u6c7a\u65b9\u6848<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u5206\u4f48\u5f0f\u7cfb\u7d71\u4e2d\uff0c\u6578\u64da\u4e00\u81f4\u6027\u548c\u53ef\u9760\u6027\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002Redis \u4f5c\u70ba\u4e00\u500b\u9ad8\u6548\u7684\u9375\u503c\u5b58\u5132\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u5834\u666f\u4e2d\u3002\u7136\u800c\uff0c\u96a8\u8457\u61c9\u7528\u9700\u6c42\u7684\u589e\u9577\uff0c\u5982\u4f55\u5728 Redis \u4e2d\u5be6\u73fe\u9593\u9699\u9396\uff08Gap Lock\uff09\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u53ef\u9760\u6027\uff0c\u6210\u70ba\u4e86\u4e00\u500b\u91cd\u8981\u7684\u7814\u7a76\u8ab2\u984c\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e9%96%93%e9%9a%99%e9%8e%96%ef%bc%9f-NGxRyuqbTS\">\u4ec0\u9ebc\u662f\u9593\u9699\u9396\uff1f<\/h2>\n<p>\u9593\u9699\u9396\u662f\u4e00\u7a2e\u7528\u65bc\u9632\u6b62\u5e7b\u8b80\uff08Phantom Read\uff09\u73fe\u8c61\u7684\u9396\u5b9a\u6a5f\u5236\u3002\u5728\u6578\u64da\u5eab\u4e2d\uff0c\u5e7b\u8b80\u662f\u6307\u5728\u4e00\u500b\u4e8b\u52d9\u4e2d\u8b80\u53d6\u5230\u7684\u6578\u64da\u5728\u8a72\u4e8b\u52d9\u57f7\u884c\u904e\u7a0b\u4e2d\u88ab\u5176\u4ed6\u4e8b\u52d9\u63d2\u5165\u6216\u522a\u9664\uff0c\u5c0e\u81f4\u8b80\u53d6\u7d50\u679c\u4e0d\u4e00\u81f4\u3002\u9593\u9699\u9396\u901a\u904e\u9396\u5b9a\u67d0\u500b\u7bc4\u570d\u5167\u7684\u6578\u64da\uff0c\u9632\u6b62\u5176\u4ed6\u4e8b\u52d9\u5728\u8a72\u7bc4\u570d\u5167\u9032\u884c\u63d2\u5165\u64cd\u4f5c\u3002<\/p>\n<h2 id=\"redis-%e4%b8%ad%e7%9a%84%e9%96%93%e9%9a%99%e9%8e%96%e5%af%a6%e7%8f%be-NGxRyuqbTS\">Redis \u4e2d\u7684\u9593\u9699\u9396\u5be6\u73fe<\/h2>\n<p>\u5728 Redis \u4e2d\uff0c\u5be6\u73fe\u9593\u9699\u9396\u7684\u4e3b\u8981\u601d\u8def\u662f\u5229\u7528 Redis \u7684\u539f\u5b50\u64cd\u4f5c\u548c\u6578\u64da\u7d50\u69cb\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u5be6\u73fe\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8-setnx-%e5%91%bd%e4%bb%a4-NGxRyuqbTS\">1. \u4f7f\u7528 SETNX \u547d\u4ee4<\/h3>\n<p>SETNX\uff08Set if Not eXists\uff09\u547d\u4ee4\u53ef\u4ee5\u7528\u4f86\u5be6\u73fe\u7c21\u55ae\u7684\u9396\u5b9a\u6a5f\u5236\u3002\u7576\u4e00\u500b\u4e8b\u52d9\u9700\u8981\u7372\u53d6\u9396\u6642\uff0c\u53ef\u4ee5\u5617\u8a66\u57f7\u884c SETNX \u547d\u4ee4\u3002\u5982\u679c\u6210\u529f\uff0c\u5247\u7372\u5f97\u9396\uff1b\u5982\u679c\u5931\u6557\uff0c\u5247\u8868\u793a\u9396\u5df2\u88ab\u5176\u4ed6\u4e8b\u52d9\u4f54\u7528\u3002<\/p>\n<pre><code>SETNX lock_key unique_lock_value\n<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c`lock_key` \u662f\u9396\u7684\u540d\u7a31\uff0c`unique_lock_value` \u662f\u4e00\u500b\u552f\u4e00\u7684\u6a19\u8b58\u7b26\uff0c\u7528\u65bc\u8b58\u5225\u9396\u7684\u64c1\u6709\u8005\u3002<\/p>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8-lua-%e8%85%b3%e6%9c%ac-NGxRyuqbTS\">2. \u4f7f\u7528 Lua \u8173\u672c<\/h3>\n<p>\u70ba\u4e86\u78ba\u4fdd\u9396\u7684\u539f\u5b50\u6027\uff0c\u53ef\u4ee5\u4f7f\u7528 Lua \u8173\u672c\u4f86\u5be6\u73fe\u66f4\u8907\u96dc\u7684\u9396\u5b9a\u908f\u8f2f\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684 Lua \u8173\u672c\u793a\u4f8b\uff1a<\/p>\n<pre><code>local 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>\u9019\u6bb5\u8173\u672c\u9996\u5148\u6aa2\u67e5\u9396\u662f\u5426\u5b58\u5728\uff0c\u5982\u679c\u4e0d\u5b58\u5728\u5247\u5275\u5efa\u9396\u4e26\u8fd4\u56de\u6210\u529f\u3002<\/p>\n<h3 id=\"3-%e9%8e%96%e7%9a%84%e9%81%8e%e6%9c%9f%e6%a9%9f%e5%88%b6-NGxRyuqbTS\">3. \u9396\u7684\u904e\u671f\u6a5f\u5236<\/h3>\n<p>\u70ba\u4e86\u9632\u6b62\u6b7b\u9396\uff0c\u61c9\u8a72\u70ba\u9396\u8a2d\u7f6e\u904e\u671f\u6642\u9593\u3002\u53ef\u4ee5\u4f7f\u7528 EXPIRE \u547d\u4ee4\u4f86\u8a2d\u7f6e\u9396\u7684\u6709\u6548\u671f\uff1a<\/p>\n<pre><code>EXPIRE lock_key 30\n<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u5373\u4f7f\u4e8b\u52d9\u672a\u80fd\u6b63\u5e38\u91cb\u653e\u9396\uff0c\u9396\u4e5f\u6703\u5728\u4e00\u5b9a\u6642\u9593\u5f8c\u81ea\u52d5\u91cb\u653e\u3002<\/p>\n<h2 id=\"%e9%96%93%e9%9a%99%e9%8e%96%e7%9a%84%e5%8f%af%e9%9d%a0%e6%80%a7%e6%8c%91%e6%88%b0-NGxRyuqbTS\">\u9593\u9699\u9396\u7684\u53ef\u9760\u6027\u6311\u6230<\/h2>\n<p>\u5118\u7ba1 Redis \u63d0\u4f9b\u4e86\u591a\u7a2e\u9396\u5b9a\u6a5f\u5236\uff0c\u4f46\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u4ecd\u7136\u9762\u81e8\u4e00\u4e9b\u6311\u6230\uff1a<\/p>\n<ul>\n<li><strong>\u6b7b\u9396\u554f\u984c\uff1a<\/strong>\u5982\u679c\u9396\u7684\u64c1\u6709\u8005\u5728\u6301\u6709\u9396\u7684\u904e\u7a0b\u4e2d\u5d29\u6f70\uff0c\u5247\u53ef\u80fd\u5c0e\u81f4\u6b7b\u9396\u3002<\/li>\n<li><strong>\u6027\u80fd\u74f6\u9838\uff1a<\/strong>\u904e\u591a\u7684\u9396\u7af6\u722d\u53ef\u80fd\u6703\u5f71\u97ff\u7cfb\u7d71\u6027\u80fd\uff0c\u5c0e\u81f4\u5ef6\u9072\u589e\u52a0\u3002<\/li>\n<li><strong>\u6578\u64da\u4e00\u81f4\u6027\uff1a<\/strong>\u5728\u9ad8\u4f75\u767c\u74b0\u5883\u4e0b\uff0c\u5982\u4f55\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u4ecd\u7136\u662f\u4e00\u500b\u6311\u6230\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-NGxRyuqbTS\">\u7d50\u8ad6<\/h2>\n<p>Redis \u4e2d\u7684\u9593\u9699\u9396\u5be6\u73fe\u70ba\u89e3\u6c7a\u6578\u64da\u4e00\u81f4\u6027\u554f\u984c\u63d0\u4f9b\u4e86\u4e00\u7a2e\u6709\u6548\u7684\u65b9\u6848\u3002\u901a\u904e\u4f7f\u7528\u539f\u5b50\u64cd\u4f5c\u3001Lua \u8173\u672c\u548c\u904e\u671f\u6a5f\u5236\uff0c\u53ef\u4ee5\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u63d0\u9ad8\u9396\u7684\u53ef\u9760\u6027\u3002\u7136\u800c\uff0c\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u958b\u767c\u8005\u4ecd\u9700\u8b39\u614e\u8003\u616e\u6b7b\u9396\u3001\u6027\u80fd\u548c\u6578\u64da\u4e00\u81f4\u6027\u7b49\u554f\u984c\uff0c\u4ee5\u78ba\u4fdd\u7cfb\u7d71\u7684\u7a69\u5b9a\u904b\u884c\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u548c\u5176\u4ed6\u4f3a\u670d\u5668\u89e3\u6c7a\u65b9\u6848\u7684\u4fe1\u606f\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Redis\u5be6\u73fe\u7684\u9593\u9699\u9396\u53ef\u9760\u6027\u65b0\u89e3\u6c7a\u65b9\u6848\uff0c\u63d0\u5347\u6578\u64da\u4e00\u81f4\u6027\u8207\u7cfb\u7d71\u6027\u80fd\uff0c\u78ba\u4fdd\u9ad8\u6548\u80fd\u7684\u5206\u4f48\u5f0f\u61c9\u7528\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-128353","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/128353","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=128353"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/128353\/revisions"}],"predecessor-version":[{"id":128354,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/128353\/revisions\/128354"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=128353"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=128353"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=128353"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}