{"id":193817,"date":"2024-11-13T01:21:23","date_gmt":"2024-11-12T17:21:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/193817\/"},"modified":"2024-11-13T01:21:24","modified_gmt":"2024-11-12T17:21:24","slug":"%e7%a0%94%e7%a9%b6redis%e4%b8%ad%e7%9a%84%e5%85%a9%e7%a8%ae%e9%8e%96%e5%ae%9a%e6%a9%9f%e5%88%b6%ef%bc%88redis%e7%9a%84%e5%85%a9%e7%a8%ae%e9%8e%96%e6%a9%9f%e5%88%b6%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/193817\/","title":{"rendered":"\u7814\u7a76Redis\u4e2d\u7684\u5169\u7a2e\u9396\u5b9a\u6a5f\u5236\uff08redis\u7684\u5169\u7a2e\u9396\u6a5f\u5236\uff09"},"content":{"rendered":"

\u7814\u7a76Redis\u4e2d\u7684\u5169\u7a2e\u9396\u5b9a\u6a5f\u5236<\/h1>\n

\u5728\u7576\u4eca\u7684\u5206\u4f48\u5f0f\u7cfb\u7d71\u4e2d\uff0c\u6578\u64da\u4e00\u81f4\u6027\u548c\u4e26\u767c\u63a7\u5236\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002Redis\u4f5c\u70ba\u4e00\u500b\u9ad8\u6548\u7684\u9375\u503c\u5b58\u5132\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u9396\u5b9a\u6a5f\u5236\u4f86\u5e6b\u52a9\u958b\u767c\u8005\u7ba1\u7406\u4e26\u767c\u8a2a\u554f\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eRedis\u4e2d\u7684\u5169\u7a2e\u4e3b\u8981\u9396\u5b9a\u6a5f\u5236\uff1a\u57fa\u65bcSETNX\u7684\u9396\u548cRedLock\u9396\u3002<\/p>\n

1. \u57fa\u65bcSETNX\u7684\u9396<\/h2>\n

SETNX\uff08Set if Not eXists\uff09\u662f\u4e00\u500bRedis\u547d\u4ee4\uff0c\u7528\u65bc\u5728\u9375\u4e0d\u5b58\u5728\u7684\u60c5\u6cc1\u4e0b\u8a2d\u7f6e\u9375\u7684\u503c\u3002\u9019\u4e00\u7279\u6027\u4f7f\u5f97SETNX\u6210\u70ba\u5be6\u73fe\u5206\u4f48\u5f0f\u9396\u7684\u57fa\u790e\u3002\u4ee5\u4e0b\u662f\u57fa\u65bcSETNX\u7684\u9396\u7684\u57fa\u672c\u5be6\u73fe\u6b65\u9a5f\uff1a<\/p>\n

\n1. \u5ba2\u6236\u7aef\u5617\u8a66\u4f7f\u7528SETNX\u547d\u4ee4\u8a2d\u7f6e\u4e00\u500b\u9396\u9375\uff08\u4f8b\u5982\uff1alock_key\uff09\u3002\n2. \u5982\u679c\u8fd4\u56de\u503c\u70ba1\uff0c\u8868\u793a\u9396\u6210\u529f\u7372\u53d6\uff0c\u5ba2\u6236\u7aef\u53ef\u4ee5\u9032\u884c\u5f8c\u7e8c\u64cd\u4f5c\u3002\n3. \u5982\u679c\u8fd4\u56de\u503c\u70ba0\uff0c\u8868\u793a\u9396\u5df2\u88ab\u5176\u4ed6\u5ba2\u6236\u7aef\u7372\u53d6\uff0c\u5247\u9700\u8981\u7b49\u5f85\u6216\u91cd\u8a66\u3002\n4. \u5ba2\u6236\u7aef\u5728\u5b8c\u6210\u64cd\u4f5c\u5f8c\uff0c\u4f7f\u7528DEL\u547d\u4ee4\u522a\u9664\u9396\u9375\uff0c\u91cb\u653e\u9396\u3002\n<\/code><\/pre>\n
\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\u4ee3\u78bc\uff1a<\/p>\n
\nSET lock_key \"locked\" NX EX 10  # \u8a2d\u7f6e\u9396\uff0c\u904e\u671f\u6642\u9593\u70ba10\u79d2\nif (result == 1) {\n    \/\/ \u7372\u53d6\u9396\u6210\u529f\uff0c\u57f7\u884c\u64cd\u4f5c\n    ...\n    DEL lock_key  # \u91cb\u653e\u9396\n} else {\n    \/\/ \u7372\u53d6\u9396\u5931\u6557\uff0c\u8655\u7406\u908f\u8f2f\n}\n<\/code><\/pre>\n
\u57fa\u65bcSETNX\u7684\u9396\u7684\u512a\u9ede\u5728\u65bc\u5176\u7c21\u55ae\u6027\u548c\u9ad8\u6548\u6027\uff0c\u4f46\u4e5f\u5b58\u5728\u4e00\u4e9b\u7f3a\u9ede\uff0c\u4f8b\u5982\u7121\u6cd5\u81ea\u52d5\u91cb\u653e\u9396\uff0c\u53ef\u80fd\u5c0e\u81f4\u6b7b\u9396\u7684\u60c5\u6cc1\u3002\u56e0\u6b64\uff0c\u958b\u767c\u8005\u9700\u8981\u8b39\u614e\u8a2d\u8a08\u9396\u7684\u904e\u671f\u6642\u9593\u548c\u91cb\u653e\u908f\u8f2f\u3002<\/p>\n
2. RedLock\u9396<\/h2>\n
RedLock\u662f\u4e00\u7a2e\u7531Redis\u5275\u59cb\u4ebaAntirez\u63d0\u51fa\u7684\u5206\u4f48\u5f0f\u9396\u7b97\u6cd5\uff0c\u65e8\u5728\u89e3\u6c7a\u57fa\u65bcSETNX\u9396\u7684\u4e0d\u8db3\u4e4b\u8655\u3002RedLock\u7684\u57fa\u672c\u601d\u60f3\u662f\u4f7f\u7528\u591a\u500bRedis\u5be6\u4f8b\u4f86\u63d0\u9ad8\u9396\u7684\u53ef\u9760\u6027\u3002\u4ee5\u4e0b\u662fRedLock\u7684\u5be6\u73fe\u6b65\u9a5f\uff1a<\/p>\n
    \n
  1. \u5728N\u500bRedis\u5be6\u4f8b\u4e2d\uff0c\u5ba2\u6236\u7aef\u4f9d\u6b21\u5617\u8a66\u7372\u53d6\u9396\uff0c\u6bcf\u6b21\u4f7f\u7528SETNX\u547d\u4ee4\u8a2d\u7f6e\u9396\u9375\u3002<\/li>\n
  2. \u5982\u679c\u6210\u529f\u7372\u53d6\u9396\u7684\u5be6\u4f8b\u6578\u91cf\u8d85\u904eN\/2\uff0c\u5247\u8a8d\u70ba\u9396\u7372\u53d6\u6210\u529f\u3002<\/li>\n
  3. \u9396\u7684\u6709\u6548\u671f\u61c9\u8a2d\u7f6e\u70ba\u4e00\u500b\u5408\u7406\u7684\u6642\u9593\uff0c\u4e26\u5728\u64cd\u4f5c\u5b8c\u6210\u5f8c\u91cb\u653e\u9396\u3002<\/li>\n<\/ol>\n
    \u4ee5\u4e0b\u662f\u4e00\u500bRedLock\u7684\u7c21\u55ae\u793a\u4f8b\u4ee3\u78bc\uff1a<\/p>\n
    \nfunction acquireLock() {\n    $successCount = 0;\n    $lockKey = \"lock_key\";\n    $lockValue = uniqid();\n    $expiryTime = 10;  \/\/ \u9396\u7684\u904e\u671f\u6642\u9593\n\n    foreach ($redisInstances as $instance) {\n        if ($instance->set($lockKey, $lockValue, ['nx', 'ex' => $expiryTime])) {\n            $successCount++;\n        }\n    }\n\n    return $successCount > (count($redisInstances) \/ 2) ? $lockValue : null;\n}\n\nfunction releaseLock($lockValue) {\n    foreach ($redisInstances as $instance) {\n        if ($instance->get($lockKey) === $lockValue) {\n            $instance->del($lockKey);\n        }\n    }\n}\n<\/code><\/pre>\n
    RedLock\u7684\u512a\u52e2\u5728\u65bc\u5176\u9ad8\u53ef\u7528\u6027\u548c\u53ef\u9760\u6027\uff0c\u7279\u5225\u662f\u5728\u5206\u4f48\u5f0f\u74b0\u5883\u4e2d\u3002\u7136\u800c\uff0c\u5be6\u73fe\u76f8\u5c0d\u8907\u96dc\uff0c\u4e26\u4e14\u9700\u8981\u591a\u500bRedis\u5be6\u4f8b\u7684\u652f\u6301\u3002<\/p>\n
    \u7e3d\u7d50<\/h2>\n
    \u5728Redis\u4e2d\uff0c\u57fa\u65bcSETNX\u7684\u9396\u548cRedLock\u9396\u662f\u5169\u7a2e\u5e38\u898b\u7684\u9396\u5b9a\u6a5f\u5236\uff0c\u5404\u6709\u5176\u512a\u7f3a\u9ede\u3002\u57fa\u65bcSETNX\u7684\u9396\u7c21\u55ae\u6613\u7528\uff0c\u4f46\u53ef\u80fd\u5c0e\u81f4\u6b7b\u9396\uff1b\u800cRedLock\u5247\u63d0\u4f9b\u4e86\u66f4\u9ad8\u7684\u53ef\u9760\u6027\uff0c\u4f46\u5be6\u73fe\u8f03\u70ba\u8907\u96dc\u3002\u6839\u64da\u5177\u9ad4\u7684\u61c9\u7528\u5834\u666f\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u9078\u64c7\u5408\u9069\u7684\u9396\u5b9a\u6a5f\u5236\u4f86\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u7cfb\u7d71\u7684\u7a69\u5b9a\u6027\u3002<\/p>\n
    \u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u9069\u5408\u5404\u7a2e\u9700\u6c42\u3002\u7121\u8ad6\u662f \u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u985e\u578b\u7684 \u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u63a2\u7d22Redis\u4e2d\u7684\u5169\u7a2e\u9396\u5b9a\u6a5f\u5236\uff0c\u4e86\u89e3\u5176\u539f\u7406\u8207\u61c9\u7528\uff0c\u63d0\u5347\u6578\u64da\u4e00\u81f4\u6027\u8207\u7cfb\u7d71\u6027\u80fd\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-193817","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/193817","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=193817"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/193817\/revisions"}],"predecessor-version":[{"id":193818,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/193817\/revisions\/193818"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=193817"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=193817"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=193817"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}