{"id":201254,"date":"2025-05-10T09:46:47","date_gmt":"2025-05-10T01:46:47","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201254\/"},"modified":"2025-05-10T09:46:47","modified_gmt":"2025-05-10T01:46:47","slug":"%e8%af%a6%e8%a7%a3%e7%bc%93%e5%ad%98%e7%a9%bf%e9%80%8f%e5%87%bb%e7%a9%bf%e9%9b%aa%e5%b4%a9%e8%a7%a3%e5%86%b3%e6%96%b9%e6%a1%88","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201254\/","title":{"rendered":"\u8be6\u89e3\u7f13\u5b58\u7a7f\u900f\u51fb\u7a7f\u96ea\u5d29\u89e3\u51b3\u65b9\u6848"},"content":{"rendered":"

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

\u8be6\u89e3\u7f13\u5b58\u7a7f\u900f\u51fb\u7a7f\u96ea\u5d29\u89e3\u51b3\u65b9\u6848<\/h1>\n

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

\u5728\u6570\u636e\u5e93\u5b9e\u6218\u5f00\u53d1\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u9047\u5230\u4e00\u4e9b\u8fd9\u6837\u90a3\u6837\u7684\u95ee\u9898\uff0c\u7136\u540e\u8981\u5361\u597d\u534a\u5929\uff0c\u7b49\u95ee\u9898\u89e3\u51b3\u4e86\u624d\u53d1\u73b0\u539f\u6765\u4e00\u4e9b\u7ec6\u8282\u77e5\u8bc6\u70b9\u8fd8\u662f\u6ca1\u6709\u638c\u63e1\u597d\u3002\u4eca\u5929golang\u5b66\u4e60\u7f51\u5c31\u6574\u7406\u5206\u4eab\u300a\u8be6\u89e3\u7f13\u5b58\u7a7f\u900f\u51fb\u7a7f\u96ea\u5d29\u89e3\u51b3\u65b9\u6848\u300b\uff0c\u804a\u804aredis\u7f13\u5b58\u3001\u7a7f\u900f\u3001\u51fb\u7a7f\u3001\u96ea\u5d29\uff0c\u5e0c\u671b\u53ef\u4ee5\u5e2e\u52a9\u5230\u6b63\u5728\u52aa\u529b\u8d5a\u94b1\u7684\u4f60\u3002<\/p>\n

\u4e00\uff1a\u524d\u8a00<\/h2>\n

\u8bbe\u8ba1\u4e00\u4e2a\u7f13\u5b58\u7cfb\u7edf\uff0c\u4e0d\u5f97\u4e0d\u8981\u8003\u8651\u7684\u95ee\u9898\u5c31\u662f\uff1a\u7f13\u5b58\u7a7f\u900f\u3001\u7f13\u5b58\u51fb\u7a7f\u4e0e\u5931\u6548\u65f6\u7684\u96ea\u5d29\u6548\u5e94\u3002<\/p>\n

\u4e8c\uff1a\u7f13\u5b58\u7a7f\u900f<\/h2>\n

\u7f13\u5b58\u7a7f\u900f\u662f\u6307\u67e5\u8be2\u4e00\u4e2a\u4e00\u5b9a\u4e0d\u5b58\u5728\u7684\u6570\u636e\uff0c\u7531\u4e8e\u7f13\u5b58\u662f\u4e0d\u547d\u4e2d\u65f6\u88ab\u52a8\u5199\u7684\uff0c\u5e76\u4e14\u51fa\u4e8e\u5bb9\u9519\u8003\u8651\uff0c\u5982\u679c\u4ece\u5b58\u50a8\u5c42\u67e5\u4e0d\u5230\u6570\u636e\u5219\u4e0d\u5199\u5165\u7f13\u5b58\uff0c\u8fd9\u5c06\u5bfc\u81f4\u8fd9\u4e2a\u4e0d\u5b58\u5728\u7684\u6570\u636e\u6bcf\u6b21\u8bf7\u6c42\u90fd\u8981\u5230\u5b58\u50a8\u5c42\u53bb\u67e5\u8be2\uff0c\u5931\u53bb\u4e86\u7f13\u5b58\u7684\u610f\u4e49\u3002\u5728\u6d41\u91cf\u5927\u65f6\uff0c\u53ef\u80fdDB\u5c31\u6302\u6389\u4e86\uff0c\u8981\u662f\u6709\u4eba\u5229\u7528\u4e0d\u5b58\u5728\u7684key\u9891\u7e41\u653b\u51fb\u6211\u4eec\u7684\u5e94\u7528\uff0c\u8fd9\u5c31\u662f\u6f0f\u6d1e\u3002<\/p>\n

\u4e09\uff1a\u89e3\u51b3\u65b9\u6848<\/h2>\n

\u6709\u5f88\u591a\u79cd\u65b9\u6cd5\u53ef\u4ee5\u6709\u6548\u5730\u89e3\u51b3\u7f13\u5b58\u7a7f\u900f\u95ee\u9898\uff0c\u6700\u5e38\u89c1\u7684\u5219\u662f\u91c7\u7528\u5e03\u9686\u8fc7\u6ee4\u5668\uff0c\u5c06\u6240\u6709\u53ef\u80fd\u5b58\u5728\u7684\u6570\u636e\u54c8\u5e0c\u5230\u4e00\u4e2a\u8db3\u591f\u5927\u7684bitmap\u4e2d\uff0c\u4e00\u4e2a\u4e00\u5b9a\u4e0d\u5b58\u5728\u7684\u6570\u636e\u4f1a\u88ab \u8fd9\u4e2abitmap\u62e6\u622a\u6389\uff0c\u4ece\u800c\u907f\u514d\u4e86\u5bf9\u5e95\u5c42\u5b58\u50a8\u7cfb\u7edf\u7684\u67e5\u8be2\u538b\u529b\u3002\u53e6\u5916\u4e5f\u6709\u4e00\u4e2a\u66f4\u4e3a\u7b80\u5355\u7c97\u66b4\u7684\u65b9\u6cd5\uff08\u6211\u4eec\u91c7\u7528\u7684\u5c31\u662f\u8fd9\u79cd\uff09\uff0c\u5982\u679c\u4e00\u4e2a\u67e5\u8be2\u8fd4\u56de\u7684\u6570\u636e\u4e3a\u7a7a\uff08\u4e0d\u7ba1\u662f\u6570 \u636e\u4e0d\u5b58\u5728\uff0c\u8fd8\u662f\u7cfb\u7edf\u6545\u969c\uff09\uff0c\u6211\u4eec\u4ecd\u7136\u628a\u8fd9\u4e2a\u7a7a\u7ed3\u679c\u8fdb\u884c\u7f13\u5b58\uff0c\u4f46\u5b83\u7684\u8fc7\u671f\u65f6\u95f4\u4f1a\u5f88\u77ed\uff0c\u6700\u957f\u4e0d\u8d85\u8fc7\u4e94\u5206\u949f\u3002<\/p>\n

\u56db\uff1a\u7f13\u5b58\u96ea\u5d29<\/h2>\n

\u7f13\u5b58\u96ea\u5d29\u662f\u6307\u5728\u6211\u4eec\u8bbe\u7f6e\u7f13\u5b58\u65f6\u91c7\u7528\u4e86\u76f8\u540c\u7684\u8fc7\u671f\u65f6\u95f4\uff0c\u5bfc\u81f4\u7f13\u5b58\u5728\u67d0\u4e00\u65f6\u523b\u540c\u65f6\u5931\u6548\uff0c\u8bf7\u6c42\u5168\u90e8\u8f6c\u53d1\u5230DB\uff0cDB\u77ac\u65f6\u538b\u529b\u8fc7\u91cd\u96ea\u5d29\u3002<\/p>\n

\u4e94\uff1a\u89e3\u51b3\u65b9\u6848<\/h2>\n

\u7f13\u5b58\u5931\u6548\u65f6\u7684\u96ea\u5d29\u6548\u5e94\u5bf9\u5e95\u5c42\u7cfb\u7edf\u7684\u51b2\u51fb\u975e\u5e38\u53ef\u6015\u3002\u5927\u591a\u6570\u7cfb\u7edf\u8bbe\u8ba1\u8005\u8003\u8651\u7528\u52a0\u9501\u6216\u8005\u961f\u5217\u7684\u65b9\u5f0f\u4fdd\u8bc1\u7f13\u5b58\u7684\u5355\u7ebf \u7a0b\uff08\u8fdb\u7a0b\uff09\u5199\uff0c\u4ece\u800c\u907f\u514d\u5931\u6548\u65f6\u5927\u91cf\u7684\u5e76\u53d1\u8bf7\u6c42\u843d\u5230\u5e95\u5c42\u5b58\u50a8\u7cfb\u7edf\u4e0a\u3002\u8fd9\u91cc\u5206\u4eab\u4e00\u4e2a\u7b80\u5355\u65b9\u6848\u5c31\u65f6\u8bb2\u7f13\u5b58\u5931\u6548\u65f6\u95f4\u5206\u6563\u5f00\uff0c\u6bd4\u5982\u6211\u4eec\u53ef\u4ee5\u5728\u539f\u6709\u7684\u5931\u6548\u65f6\u95f4\u57fa\u7840\u4e0a\u589e\u52a0\u4e00\u4e2a\u968f\u673a\u503c\uff0c\u6bd4\u59821-5\u5206\u949f\u968f\u673a\uff0c\u8fd9\u6837\u6bcf\u4e00\u4e2a\u7f13\u5b58\u7684\u8fc7\u671f\u65f6\u95f4\u7684\u91cd\u590d\u7387\u5c31\u4f1a\u964d\u4f4e\uff0c\u5c31\u5f88\u96be\u5f15\u53d1\u96c6\u4f53\u5931\u6548\u7684\u4e8b\u4ef6\u3002<\/p>\n

\u516d\uff1a\u7f13\u5b58\u51fb\u7a7f<\/h2>\n

\u5bf9\u4e8e\u4e00\u4e9b\u8bbe\u7f6e\u4e86\u8fc7\u671f\u65f6\u95f4\u7684key\uff0c\u5982\u679c\u8fd9\u4e9bkey\u53ef\u80fd\u4f1a\u5728\u67d0\u4e9b\u65f6\u95f4\u70b9\u88ab\u8d85\u9ad8\u5e76\u53d1\u5730\u8bbf\u95ee\uff0c\u662f\u4e00\u79cd\u975e\u5e38\u201c\u70ed\u70b9\u201d\u7684\u6570\u636e\u3002\u8fd9\u4e2a\u65f6\u5019\uff0c\u9700\u8981\u8003\u8651\u4e00\u4e2a\u95ee\u9898\uff1a\u7f13\u5b58\u88ab\u201c\u51fb\u7a7f\u201d\u7684\u95ee\u9898\uff0c\u8fd9\u4e2a\u548c\u7f13\u5b58\u96ea\u5d29\u7684\u533a\u522b\u5728\u4e8e\u8fd9\u91cc\u9488\u5bf9\u67d0\u4e00key\u7f13\u5b58\uff0c\u524d\u8005\u5219\u662f\u5f88\u591akey\u3002<\/p>\n

\u7f13\u5b58\u5728\u67d0\u4e2a\u65f6\u95f4\u70b9\u8fc7\u671f\u7684\u65f6\u5019\uff0c\u6070\u597d\u5728\u8fd9\u4e2a\u65f6\u95f4\u70b9\u5bf9\u8fd9\u4e2aKey\u6709\u5927\u91cf\u7684\u5e76\u53d1\u8bf7\u6c42\u8fc7\u6765\uff0c\u8fd9\u4e9b\u8bf7\u6c42\u53d1\u73b0\u7f13\u5b58\u8fc7\u671f\u4e00\u822c\u90fd\u4f1a\u4ece\u540e\u7aefDB\u52a0\u8f7d\u6570\u636e\u5e76\u56de\u8bbe\u5230\u7f13\u5b58\uff0c\u8fd9\u4e2a\u65f6\u5019\u5927\u5e76\u53d1\u7684\u8bf7\u6c42\u53ef\u80fd\u4f1a\u77ac\u95f4\u628a\u540e\u7aefDB\u538b\u57ae\u3002<\/p>\n

\u4e03\uff1a\u89e3\u51b3\u65b9\u6848<\/h2>\n

1\u3001\u4f7f\u7528\u4e92\u65a5\u9501(mutex key)<\/h3>\n

\u4e1a\u754c\u6bd4\u8f83\u5e38\u7528\u7684\u505a\u6cd5\uff0c\u662f\u4f7f\u7528mutex\u3002\u7b80\u5355\u5730\u6765\u8bf4\uff0c\u5c31\u662f\u5728\u7f13\u5b58\u5931\u6548\u7684\u65f6\u5019\uff08\u5224\u65ad\u62ff\u51fa\u6765\u7684\u503c\u4e3a\u7a7a\uff09\uff0c\u4e0d\u662f\u7acb\u5373\u53bbload db\uff0c\u800c\u662f\u5148\u4f7f\u7528\u7f13\u5b58\u5de5\u5177\u7684\u67d0\u4e9b\u5e26\u6210\u529f\u64cd\u4f5c\u8fd4\u56de\u503c\u7684\u64cd\u4f5c\uff08\u6bd4\u5982Redis\u7684SETNX\u6216\u8005Memcache\u7684ADD\uff09\u53bbset\u4e00\u4e2amutex key\uff0c\u5f53\u64cd\u4f5c\u8fd4\u56de\u6210\u529f\u65f6\uff0c\u518d\u8fdb\u884cload db\u7684\u64cd\u4f5c\u5e76\u56de\u8bbe\u7f13\u5b58\uff1b\u5426\u5219\uff0c\u5c31\u91cd\u8bd5\u6574\u4e2aget\u7f13\u5b58\u7684\u65b9\u6cd5\u3002<\/p>\n

SETNX\uff0c\u662f\u300cSET if Not eXists\u300d\u7684\u7f29\u5199\uff0c\u4e5f\u5c31\u662f\u53ea\u6709\u4e0d\u5b58\u5728\u7684\u65f6\u5019\u624d\u8bbe\u7f6e\uff0c\u53ef\u4ee5\u5229\u7528\u5b83\u6765\u5b9e\u73b0\u9501\u7684\u6548\u679c\u3002\u5728redis2.6.1\u4e4b\u524d\u7248\u672c\u672a\u5b9e\u73b0setnx\u7684\u8fc7\u671f\u65f6\u95f4\uff0c\u6240\u4ee5\u8fd9\u91cc\u7ed9\u51fa\u4e24\u79cd\u7248\u672c\u4ee3\u7801\u53c2\u8003\uff1a<\/p>\n

\n\/\/2.6.1\u524d\u5355\u673a\u7248\u672c\u9501\nString get(String key) {\n   String value = redis.get(key);\n   if (value  == null) {\n    if (redis.setnx(key_mutex, \"1\")) {\n        \/\/ 3 min timeout to avoid mutex holder crash\n        redis.expire(key_mutex, 3 * 60)\n        value = db.get(key);\n        redis.set(key, value);\n        redis.delete(key_mutex);\n    } else {\n        \/\/\u5176\u4ed6\u7ebf\u7a0b\u4f11\u606f50\u6beb\u79d2\u540e\u91cd\u8bd5\n        Thread.sleep(50);\n        get(key);\n    }\n  }\n}<\/pre>\n
\u6700\u65b0\u7248\u672c\u4ee3\u7801\uff1a<\/p>\n
\npublic String get(key) {\n      String value = redis.get(key);\n      if (value == null) { \/\/\u4ee3\u8868\u7f13\u5b58\u503c\u8fc7\u671f\n          \/\/\u8bbe\u7f6e3min\u7684\u8d85\u65f6\uff0c\u9632\u6b62del\u64cd\u4f5c\u5931\u8d25\u7684\u65f6\u5019\uff0c\u4e0b\u6b21\u7f13\u5b58\u8fc7\u671f\u4e00\u76f4\u4e0d\u80fdload db\n          if (redis.setnx(key_mutex, 1, 3 * 60) == 1) {  \/\/\u4ee3\u8868\u8bbe\u7f6e\u6210\u529f\n               value = db.get(key);\n                      redis.set(key, value, expire_secs);\n                      redis.del(key_mutex);\n              } else {  \/\/\u8fd9\u4e2a\u65f6\u5019\u4ee3\u8868\u540c\u65f6\u5019\u7684\u5176\u4ed6\u7ebf\u7a0b\u5df2\u7ecfload db\u5e76\u56de\u8bbe\u5230\u7f13\u5b58\u4e86\uff0c\u8fd9\u65f6\u5019\u91cd\u8bd5\u83b7\u53d6\u7f13\u5b58\u503c\u5373\u53ef\n                      sleep(50);\n                      get(key);  \/\/\u91cd\u8bd5\n              }\n          } else {\n              return value;\n          }\n }<\/pre>\n
memcache\u4ee3\u7801<\/p>\n
\nif (memcache.get(key) == null) {\n    \/\/ 3 min timeout to avoid mutex holder crash\n    if (memcache.add(key_mutex, 3 * 60 * 1000) == true) {\n        value = db.get(key);\n        memcache.set(key, value);\n        memcache.delete(key_mutex);\n    } else {\n        sleep(50);\n        retry();\n    }\n}<\/pre>\n
2\u3001”\u63d0\u524d”\u4f7f\u7528\u4e92\u65a5\u9501(mutex key)<\/h3>\n
\u5728value\u5185\u90e8\u8bbe\u7f6e1\u4e2a\u8d85\u65f6\u503c(timeout1), timeout1\u6bd4\u5b9e\u9645\u7684memcache timeout(timeout2)\u5c0f\u3002\u5f53\u4ececache\u8bfb\u53d6\u5230timeout1\u53d1\u73b0\u5b83\u5df2\u7ecf\u8fc7\u671f\u65f6\u5019\uff0c\u9a6c\u4e0a\u5ef6\u957ftimeout1\u5e76\u91cd\u65b0\u8bbe\u7f6e\u5230cache\u3002\u7136\u540e\u518d\u4ece\u6570\u636e\u5e93\u52a0\u8f7d\u6570\u636e\u5e76\u8bbe\u7f6e\u5230cache\u4e2d\u3002\u4f2a\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
\nv = memcache.get(key);\nif (v == null) {\n    if (memcache.add(key_mutex, 3 * 60 * 1000) == true) {\n        value = db.get(key);\n        memcache.set(key, value);\n        memcache.delete(key_mutex);\n    } else {\n        sleep(50);\n        retry();\n    }\n} else {\n    if (v.timeout \n\n
3\u3001\"\u6c38\u8fdc\u4e0d\u8fc7\u671f\"<\/h3>\n
\u8fd9\u91cc\u7684\u201c\u6c38\u8fdc\u4e0d\u8fc7\u671f\u201d\u5305\u542b\u4e24\u5c42\u610f\u601d\uff1a<\/p>\n
(1) \u4eceredis\u4e0a\u770b\uff0c\u786e\u5b9e\u6ca1\u6709\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\uff0c\u8fd9\u5c31\u4fdd\u8bc1\u4e86\uff0c\u4e0d\u4f1a\u51fa\u73b0\u70ed\u70b9key\u8fc7\u671f\u95ee\u9898\uff0c\u4e5f\u5c31\u662f\u201c\u7269\u7406\u201d\u4e0d\u8fc7\u671f\u3002<\/p>\n
(2) \u4ece\u529f\u80fd\u4e0a\u770b\uff0c\u5982\u679c\u4e0d\u8fc7\u671f\uff0c\u90a3\u4e0d\u5c31\u6210\u9759\u6001\u7684\u4e86\u5417\uff1f\u6240\u4ee5\u6211\u4eec\u628a\u8fc7\u671f\u65f6\u95f4\u5b58\u5728key\u5bf9\u5e94\u7684value\u91cc\uff0c\u5982\u679c\u53d1\u73b0\u8981\u8fc7\u671f\u4e86\uff0c\u901a\u8fc7\u4e00\u4e2a\u540e\u53f0\u7684\u5f02\u6b65\u7ebf\u7a0b\u8fdb\u884c\u7f13\u5b58\u7684\u6784\u5efa\uff0c\u4e5f\u5c31\u662f\u201c\u903b\u8f91\u201d\u8fc7\u671f<\/p>\n
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