{"id":201137,"date":"2025-05-10T08:29:59","date_gmt":"2025-05-10T00:29:59","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201137\/"},"modified":"2025-05-10T08:29:59","modified_gmt":"2025-05-10T00:29:59","slug":"%e6%b5%85%e8%b0%88redis-%e7%bc%93%e5%ad%98%e7%9a%84%e4%b8%89%e5%a4%a7%e9%97%ae%e9%a2%98%e5%8f%8a%e5%85%b6%e8%a7%a3%e5%86%b3%e6%96%b9%e6%a1%88","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201137\/","title":{"rendered":"\u6d45\u8c08Redis \u7f13\u5b58\u7684\u4e09\u5927\u95ee\u9898\u53ca\u5176\u89e3\u51b3\u65b9\u6848"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>\u6d45\u8c08Redis \u7f13\u5b58\u7684\u4e09\u5927\u95ee\u9898\u53ca\u5176\u89e3\u51b3\u65b9\u6848<\/h1>\n<p><span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> <\/p>\n<p>\u672c\u7bc7\u6587\u7ae0\u7ed9\u5927\u5bb6\u5206\u4eab\u300a\u6d45\u8c08Redis \u7f13\u5b58\u7684\u4e09\u5927\u95ee\u9898\u53ca\u5176\u89e3\u51b3\u65b9\u6848\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<p>Redis \u7ecf\u5e38\u7528\u4e8e\u7cfb\u7edf\u4e2d\u7684\u7f13\u5b58\uff0c\u8fd9\u6837\u53ef\u4ee5\u89e3\u51b3\u76ee\u524d IO \u8bbe\u5907\u65e0\u6cd5\u6ee1\u8db3\u4e92\u8054\u7f51\u5e94\u7528\u6d77\u91cf\u7684\u8bfb\u5199\u8bf7\u6c42\u7684\u95ee\u9898\u3002<\/p>\n<h2>\u4e00\u3001\u7f13\u5b58\u7a7f\u900f<br \/><\/h2>\n<p>\u7f13\u5b58\u7a7f\u900f\u662f\u6307\u7f13\u5b58\u548c\u6570\u636e\u5e93\u4e2d\u90fd\u6ca1\u6709\u7684\u6570\u636e\uff0c\u800c\u7528\u6237\u4e0d\u65ad\u53d1\u8d77\u8bf7\u6c42\uff0c\u5982\u53d1\u8d77 id \u4e3a-1 \u7684\u6570\u636e\u6216\u8005\u7279\u522b\u5927\u7684\u4e0d\u5b58\u5728\u7684\u6570\u636e\u3002\u6709\u53ef\u80fd\u662f\u9ed1\u5ba2\u5229\u7528\u6f0f\u6d1e\u653b\u51fb\u4ece\u800c\u53bb\u538b\u57ae\u5e94\u7528\u7684\u6570\u636e\u5e93\u3002<\/p>\n<h3>1. \u5e38\u89c1\u89e3\u51b3\u65b9\u6848<br \/><\/h3>\n<p>\u5bf9\u4e8e\u7f13\u5b58\u7a7f\u900f\u95ee\u9898\uff0c\u5e38\u89c1\u7684\u89e3\u51b3\u65b9\u6848\u6709\u4ee5\u4e0b\u4e09\u79cd\uff1a<\/p>\n<ul>\n<li>\u9a8c\u8bc1\u62e6\u622a\uff1a\u63a5\u53e3\u5c42\u8fdb\u884c\u6821\u9a8c\uff0c\u5982\u9274\u5b9a\u7528\u6237\u6743\u9650\uff0c\u5bf9 ID \u4e4b\u7c7b\u7684\u5b57\u6bb5\u505a\u57fa\u7840\u7684\u6821\u9a8c\uff0c\u5982 id <\/li>\n<li>\u7f13\u5b58\u7a7a\u6570\u636e\uff1a\u5f53\u6570\u636e\u5e93\u67e5\u8be2\u5230\u7684\u6570\u636e\u4e3a\u7a7a\u65f6\uff0c\u4e5f\u5c06\u8fd9\u6761\u6570\u636e\u8fdb\u884c\u7f13\u5b58\uff0c\u4f46\u7f13\u5b58\u7684\u6709\u6548\u6027\u8bbe\u7f6e\u5f97\u8981\u8f83\u77ed\uff0c\u4ee5\u514d\u5f71\u54cd\u6b63\u5e38\u6570\u636e\u7684\u7f13\u5b58\uff1b<\/li>\n<\/ul>\n<pre>\nCopypublic Student getStudentsByID(Long id) {\n\n\/\/ \u4eceRedis\u4e2d\u83b7\u53d6\u5b66\u751f\u4fe1\u606f\nStudent student = redisTemplate.opsForValue()\n    .get(String.valueOf(id));\nif (student != null) {\n    return student;\n}\n\n\/\/ \u4ece\u6570\u636e\u5e93\u67e5\u8be2\u5b66\u751f\u4fe1\u606f\uff0c\u5e76\u5b58\u5165Redis\nstudent = studentDao.selectByStudentId(id);\nif (student != null) {\n    redisTemplate.opsForValue()\n        .set(String.valueOf(id), student, 60, TimeUnit.MINUTES);\n} else {\n    \/\/ \u5373\u4f7f\u4e0d\u5b58\u5728\uff0c\u4e5f\u5c06\u5176\u5b58\u5165\u7f13\u5b58\u4e2d\n    redisTemplate.opsForValue()\n        .set(String.valueOf(id), null, 60, TimeUnit.SECONDS);\n}\n\nreturn student;\n\n}\n\n<\/pre>\n<p>\u4f7f\u7528\u5e03\u9686\u8fc7\u6ee4\u5668\uff1a\u5e03\u9686\u8fc7\u6ee4\u5668\u662f\u4e00\u79cd\u6bd4\u8f83\u72ec\u7279\u6570\u636e\u7ed3\u6784\uff0c\u6709\u4e00\u5b9a\u7684\u8bef\u5dee\u3002\u5f53\u5b83\u6307\u5b9a\u4e00\u4e2a\u6570\u636e\u5b58\u5728\u65f6\uff0c\u5b83\u4e0d\u4e00\u5b9a\u5b58\u5728\uff0c\u4f46\u662f\u5f53\u5b83\u6307\u5b9a\u4e00\u4e2a\u6570\u636e\u4e0d\u5b58\u5728\u65f6\uff0c\u90a3\u4e48\u5b83\u4e00\u5b9a\u662f\u4e0d\u5b58\u5728\u7684\u3002<\/p>\n<h3>2. \u5e03\u9686\u8fc7\u6ee4\u5668<br \/><\/h3>\n<p>\u5e03\u9686\u8fc7\u6ee4\u5668\u662f\u4e00\u79cd\u6bd4\u8f83\u7279\u6b8a\u7684\u6570\u636e\u7ed3\u6784\uff0c\u6709\u70b9\u7c7b\u4f3c\u4e0e HashMap\uff0c\u5728\u4e1a\u52a1\u4e2d\u6211\u4eec\u53ef\u80fd\u4f1a\u901a\u8fc7\u4f7f\u7528 HashMap \u6765\u5224\u65ad\u4e00\u4e2a\u503c\u662f\u5426\u5b58\u5728\uff0c\u5b83\u53ef\u4ee5\u5728 O(1)\u65f6\u95f4\u590d\u6742\u5ea6\u5185\u8fd4\u56de\u7ed3\u679c\uff0c\u6548\u7387\u6781\u9ad8\uff0c\u4f46\u662f\u53d7\u9650\u4e8e\u5b58\u50a8\u5bb9\u91cf\uff0c\u5982\u679c\u53ef\u80fd\u9700\u8981\u53bb\u5224\u65ad\u7684\u503c\u8d85\u8fc7\u4ebf\u7ea7\u522b\uff0c\u90a3\u4e48 HashMap \u6240\u5360\u7684\u5185\u5b58\u5c31\u5f88\u53ef\u89c2\u4e86\u3002<\/p>\n<p>\u800c BloomFilter \u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u65b9\u6848\u5f88\u7b80\u5355\u3002\u9996\u5148\u7528\u591a\u4e2a bit \u4f4d\u53bb\u4ee3\u66ff HashMap \u4e2d\u7684\u6570\u7ec4\uff0c\u8fd9\u6837\u7684\u8bdd\u50a8\u5b58\u7a7a\u95f4\u5c31\u4e0b\u6765\u4e86\uff0c\u4e4b\u540e\u5c31\u662f\u5bf9 Key \u8fdb\u884c\u591a\u6b21\u54c8\u5e0c\uff0c\u5c06 Key \u54c8\u5e0c\u540e\u7684\u503c\u6240\u5bf9\u5e94\u7684 bit \u4f4d\u7f6e\u4e3a 1\u3002<\/p>\n<p>\u5f53\u5224\u65ad\u4e00\u4e2a\u5143\u7d20\u662f\u5426\u5b58\u5728\u65f6\uff0c\u5c31\u53bb\u5224\u65ad\u8fd9\u4e2a\u503c\u54c8\u5e0c\u51fa\u6765\u7684\u6bd4\u7279\u4f4d\u662f\u5426\u90fd\u4e3a 1\uff0c\u5982\u679c\u90fd\u4e3a 1\uff0c\u90a3\u4e48\u53ef\u80fd\u5b58\u5728\uff0c\u4e5f\u53ef\u80fd\u4e0d\u5b58\u5728\uff08\u5982\u4e0b\u56fe F\uff09\u3002\u4f46\u662f\u5982\u679c\u6709\u4e00\u4e2a bit \u4f4d\u4e0d\u4e3a 1\uff0c\u90a3\u4e48\u8fd9\u4e2a Key \u5c31\u80af\u5b9a\u4e0d\u5b58\u5728\u3002<\/p>\n<p style=\"text-align: center\"><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20221230\/167237550963ae6cd5063b3.jpg?20216210515\" class=\"aligncenter\"><\/p>\n<p>\u6ce8\u610f\uff1aBloomFilter \u5e76\u4e0d\u652f\u6301\u5220\u9664\u64cd\u4f5c\uff0c\u53ea\u652f\u6301\u6dfb\u52a0\u64cd\u4f5c\u3002\u8fd9\u4e00\u70b9\u5f88\u5bb9\u6613\u7406\u89e3\uff0c\u56e0\u4e3a\u4f60\u5982\u679c\u8981\u5220\u9664\u6570\u636e\uff0c\u5c31\u5f97\u5c06\u5bf9\u5e94\u7684 bit \u4f4d\u7f6e\u4e3a 0\uff0c\u4f46\u662f\u4f60\u8fd9\u4e2a Key \u5bf9\u5e94\u7684 bit \u4f4d\u53ef\u80fd\u5176\u4ed6\u7684 Key \u4e5f\u5bf9\u5e94\u7740\u3002<\/p>\n<h3>3. \u7f13\u5b58\u7a7a\u6570\u636e\u4e0e\u5e03\u9686\u8fc7\u6ee4\u5668\u7684\u6bd4\u8f83<br \/><\/h3>\n<p>\u4e0a\u9762\u5bf9\u8fd9\u4e24\u79cd\u65b9\u6848\u90fd\u8fdb\u884c\u4e86\u7b80\u5355\u7684\u4ecb\u7ecd\uff0c\u7f13\u5b58\u7a7a\u6570\u636e\u4e0e\u5e03\u9686\u8fc7\u6ee4\u5668\u90fd\u80fd\u6709\u6548\u89e3\u51b3\u7f13\u5b58\u7a7f\u900f\u95ee\u9898\uff0c\u4f46\u4f7f\u7528\u573a\u666f\u6709\u7740\u4e9b\u8bb8\u4e0d\u540c\uff1b<\/p>\n<ul>\n<li>\u5f53\u4e00\u4e9b\u6076\u610f\u653b\u51fb\u67e5\u8be2\u67e5\u8be2\u7684 key \u5404\u4e0d\u76f8\u540c\uff0c\u800c\u4e14\u6570\u91cf\u5de8\u591a\uff0c\u6b64\u65f6\u7f13\u5b58\u7a7a\u6570\u636e\u4e0d\u662f\u4e00\u4e2a\u597d\u7684\u89e3\u51b3\u65b9\u6848\u3002\u56e0\u4e3a\u5b83\u9700\u8981\u5b58\u50a8\u6240\u6709\u7684 Key\uff0c\u5185\u5b58\u7a7a\u95f4\u5360\u7528\u9ad8\u3002\u5e76\u4e14\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5f88\u591a key \u53ef\u80fd\u53ea\u7528\u4e00\u6b21\uff0c\u6240\u4ee5\u5b58\u50a8\u4e0b\u6765\u6ca1\u6709\u610f\u4e49\u3002\u6240\u4ee5\u5bf9\u4e8e\u8fd9\u79cd\u60c5\u51b5\u800c\u8a00\uff0c\u4f7f\u7528\u5e03\u9686\u8fc7\u6ee4\u5668\u662f\u4e2a\u4e0d\u9519\u7684\u9009\u62e9\uff1b<\/li>\n<li>\u800c\u5bf9\u4e0e\u7a7a\u6570\u636e\u7684 Key \u6570\u91cf\u6709\u9650\u3001Key \u91cd\u590d\u8bf7\u6c42\u6548\u7387\u8f83\u9ad8\u7684\u573a\u666f\u800c\u8a00\uff0c\u53ef\u4ee5\u9009\u62e9\u7f13\u5b58\u7a7a\u6570\u636e\u7684\u65b9\u6848\u3002<\/li>\n<\/ul>\n<h2>\u4e8c\u3001\u7f13\u5b58\u51fb\u7a7f<br \/><\/h2>\n<p>\u7f13\u5b58\u51fb\u7a7f\u662f\u6307\u5f53\u524d\u70ed\u70b9\u6570\u636e\u5b58\u50a8\u5230\u671f\u65f6\uff0c\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u5e76\u53d1\u8bbf\u95ee\u70ed\u70b9\u6570\u636e\u3002\u56e0\u4e3a\u7f13\u5b58\u521a\u8fc7\u671f\uff0c\u6240\u6709\u5e76\u53d1\u8bf7\u6c42\u90fd\u4f1a\u5230\u6570\u636e\u5e93\u4e2d\u67e5\u8be2\u6570\u636e\u3002<\/p>\n<h3>\u89e3\u51b3\u65b9\u6848<br \/><\/h3>\n<ul>\n<li>\u5c06\u70ed\u70b9\u6570\u636e\u8bbe\u7f6e\u4e3a\u6c38\u4e0d\u8fc7\u671f\uff1b<\/li>\n<li>\u52a0\u4e92\u65a5\u9501\uff1a\u4e92\u65a5\u9501\u53ef\u4ee5\u63a7\u5236\u67e5\u8be2\u6570\u636e\u5e93\u7684\u7ebf\u7a0b\u8bbf\u95ee\uff0c\u4f46\u8fd9\u79cd\u65b9\u6848\u4f1a\u5bfc\u81f4\u7cfb\u7edf\u7684\u541e\u5410\u91cf\u4e0b\u964d\uff0c\u9700\u8981\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<pre>\nCopypublic String get(key) \n{\n    String value = redis.get(key);\n    if (value == null) \n    {\n        \/\/ \u4ee3\u8868\u7f13\u5b58\u503c\u8fc7\u671f \/\/ \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\u80fd\n        load db if (redis.setnx(key_mutex, 1, 3 * 60) == 1) {\n            \/\/ \u4ee3\u8868\u8bbe\u7f6e\u6210\u529f\n            value = db.get(key);\n            redis.set(key, value, expire_secs);\n            redis.del(key_mutex);\n        }\n        else {\n            \/\/ \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);\n            \/\/ \u91cd\u8bd5\n        }\n    }\n    else {\n        return value;\n    }\n}\n<\/pre>\n<h2>\u4e09\u3001\u7f13\u5b58\u96ea\u5d29<br \/><\/h2>\n<p>\u7f13\u5b58\u96ea\u5d29\u53d1\u751f\u6709\u51e0\u79cd\u60c5\u51b5\uff0c\u6bd4\u5982\u5927\u91cf\u7f13\u5b58\u96c6\u4e2d\u5728\u6216\u8005\u7f13\u5b58\u540c\u65f6\u5728\u5927\u8303\u56f4\u4e2d\u5931\u6548\uff0c\u51fa\u73b0\u4e86\u5927\u91cf\u8bf7\u6c42\u53bb\u8bbf\u95ee\u6570\u636e\u5e93\uff0c\u4ece\u800c\u5bfc\u81f4 CPU \u548c\u5185\u5b58\u8fc7\u8f7d\uff0c\u751a\u81f3\u505c\u673a\u3002<\/p>\n<p>\u4e00\u4e2a\u7b80\u5355\u7684\u96ea\u5d29\u8fc7\u7a0b\uff1a<\/p>\n<ol>\n<li>Redis \u96c6\u7fa4\u4ea7\u751f\u4e86\u5927\u9762\u79ef\u6545\u969c\uff1b<\/li>\n<li>\u7f13\u5b58\u5931\u8d25\uff0c\u6b64\u65f6\u4ecd\u6709\u5927\u91cf\u8bf7\u6c42\u53bb\u8bbf\u95ee Redis \u7f13\u5b58\u670d\u52a1\u5668\uff1b<\/li>\n<li>\u5728\u5927\u91cf Redis \u8bf7\u6c42\u5931\u8d25\u540e\uff0c\u8fd9\u4e9b\u8bf7\u6c42\u5c06\u4f1a\u53bb\u8bbf\u95ee\u6570\u636e\u5e93\uff1b<\/li>\n<li>\u7531\u4e8e\u5e94\u7528\u7684\u8bbe\u8ba1\u4f9d\u8d56\u4e8e\u6570\u636e\u5e93\u548c Redis \u670d\u52a1\uff0c\u5f88\u5feb\u5c31\u4f1a\u9020\u6210\u670d\u52a1\u5668\u96c6\u7fa4\u7684\u96ea\u5d29\uff0c\u6700\u7ec8\u5bfc\u81f4\u6574\u4e2a\u7cfb\u7edf\u7684\u762b\u75ea\u3002<\/li>\n<\/ol>\n<h3>\u89e3\u51b3\u65b9\u6848<br \/><\/h3>\n<ul>\n<li>\u3010\u4e8b\u524d\u3011\u9ad8\u53ef\u7528\u7f13\u5b58\uff1a\u9ad8\u53ef\u7528\u7f13\u5b58\u662f\u9632\u6b62\u51fa\u73b0\u6574\u4e2a\u7f13\u5b58\u6545\u969c\u3002\u5373\u4f7f\u4e2a\u522b\u8282\u70b9\uff0c\u673a\u5668\u751a\u81f3\u673a\u623f\u90fd\u5173\u95ed\uff0c\u7cfb\u7edf\u4ecd\u7136\u53ef\u4ee5\u63d0\u4f9b\u670d\u52a1\uff0cRedis \u54e8\u5175(Sentinel) \u548c Redis \u96c6\u7fa4(Cluster) 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