{"id":98032,"date":"2026-08-30T23:48:44","date_gmt":"2026-08-30T15:48:44","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/98032.html"},"modified":"2026-08-30T23:48:44","modified_gmt":"2026-08-30T15:48:44","slug":"redis%e5%a4%a7key%e6%8b%96%e5%9e%ae%e7%ba%bf%e4%b8%8a%ef%bc%9f%e6%8e%92%e6%9f%a5%e5%ae%9a%e4%bd%8d%e4%b8%8e%e6%b2%bb%e7%90%86%e5%ae%9e%e6%88%98","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/98032.html","title":{"rendered":"Redis\u5927Key\u62d6\u57ae\u7ebf\u4e0a\uff1f\u6392\u67e5\u5b9a\u4f4d\u4e0e\u6cbb\u7406\u5b9e\u6218"},"content":{"rendered":"

\u51cc\u6668\u4e24\u70b9，\u8fd0\u7ef4\u7535\u8bdd\u6253\u6765：Redis \u4e3b\u4ece\u5207\u6362\u5931\u8d25，QPS \u4ece 8000 \u6389\u5230 800\u3002\u767b\u4e0a\u670d\u52a1\u5668\u4e00\u770b，redis-cli –bigkeys \u626b\u51fa\u6765\u4e00\u4e2a 800 \u4e07\u5143\u7d20\u7684 Hash\u2014\u2014\u8fd9\u5c31\u662f\u5178\u578b\u7684\u5927 Key（Big Key）\u4e8b\u6545\u3002\u672c\u6587\u7528 Spring Boot 4.1 \u5b9e\u6218\u8bb2\u89e3：\u5927 Key \u600e\u4e48\u5b9a\u4e49\u3001\u4e3a\u4ec0\u4e48\u5b83\u80fd\u628a\u5355\u7ebf\u7a0b\u7684 Redis \u5361\u6b7b\u3001\u600e\u4e48\u7528 SCAN \u65e0\u963b\u585e\u626b\u63cf\u5b9a\u4f4d\u3001\u4ee5\u53ca\u62c6\u5206\u4e0e\u5f02\u6b65\u5220\u9664\u7684\u5b8c\u6574\u6cbb\u7406\u65b9\u6848\u3002<\/p>\n

\u4e00\u3001\u5927 Key \u5230\u5e95\u662f\u4ec0\u4e48，\u4e3a\u4ec0\u4e48\u5b83\u662f\u5b9a\u65f6\u70b8\u5f39<\/h3>\n

\u5927 Key \u6307\u7684\u662f\u5355\u4e2a key \u7684 value \u8fc7\u5927（string \u7c7b\u578b\u8d85\u8fc7 10KB）\u6216\u96c6\u5408\u5143\u7d20\u8fc7\u591a（hash\/list\/set\/zset \u8d85\u8fc7 5000 \u4e2a），\u5b83\u662f Redis \u751f\u4ea7\u4e8b\u6545\u7684\u5934\u53f7\u5e38\u89c1\u5143\u51f6\u3002 \u5b83\u4e0d\u662f\u5199\u9519\u4e86\u7684\u4ee3\u7801，\u800c\u662f\u6570\u636e\u91cf\u81ea\u7136\u589e\u957f\u540e"\u5f53\u521d\u6ca1\u95ee\u9898\u3001\u73b0\u5728\u8981\u547d"\u7684\u9690\u60a3\u3002<\/p>\n

\u5224\u65ad\u6807\u51c6\u6ca1\u6709\u5b98\u65b9\u786c\u6027\u89c4\u5b9a，\u4e1a\u754c\u5e38\u7528\u7ecf\u9a8c\u503c\u5982\u4e0b：<\/p>\n\n\u7c7b\u578b\u5927 Key \u5224\u65ad\u6807\u51c6\u5371\u5bb3\u7b49\u7ea7<\/tr>\n\n\n\n\n\n
String<\/td>\nvalue \u8d85\u8fc7 10KB<\/td>\n\u4e2d<\/td>\n<\/tr>\n
Hash \/ Set \/ Zset<\/td>\n\u5143\u7d20\u8d85\u8fc7 5000 \u4e2a<\/td>\n\u9ad8<\/td>\n<\/tr>\n
List<\/td>\n\u5143\u7d20\u8d85\u8fc7 5000 \u4e2a\u6216\u5355\u5143\u7d20\u8fc7\u5927<\/td>\n\u9ad8<\/td>\n<\/tr>\n
\u4efb\u610f\u7c7b\u578b<\/td>\nvalue \u603b\u5927\u5c0f\u8d85\u8fc7 1MB<\/td>\n\u9ad8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4e3a\u4ec0\u4e48\u8bf4\u5b83\u662f\u5b9a\u65f6\u70b8\u5f39？\u770b\u4e00\u4e2a\u771f\u5b9e\u573a\u666f：\u67d0\u7535\u5546\u9879\u76ee\u628a"\u7528\u6237\u8d2d\u7269\u8f66"\u5b58\u6210\u4e00\u4e2a Hash，key = cart:user:10086，field \u662f\u5546\u54c1 ID，value \u662f\u5546\u54c1\u5feb\u7167\u3002\u4e0a\u7ebf\u65f6\u6bcf\u4eba\u51e0\u4ef6\u5546\u54c1\u6ca1\u95ee\u9898，\u4e24\u5e74\u540e\u7f8a\u6bdb\u515a\u7528\u811a\u672c\u6279\u91cf\u52a0\u8d2d，\u5355\u4e2a\u7528\u6237\u8d2d\u7269\u8f66\u81a8\u80c0\u5230 20 \u4e07\u4ef6\u5546\u54c1\u3002\u67d0\u6b21\u6d3b\u52a8\u8bfb\u53d6\u8fd9\u4e2a key \u65f6，\u5355\u6b21\u547d\u4ee4\u8017\u65f6\u4ece 0.1ms \u6da8\u5230 800ms，\u63a5\u53e3\u8d85\u65f6\u7387\u98d9\u5347\u3002<\/p>\n

\u66f4\u9690\u853d\u7684\u662f\u8fc7\u671f\u5220\u9664：\u5927 Key \u8bbe\u7f6e\u4e86 TTL，\u5230\u671f\u77ac\u95f4 Redis \u9700\u8981\u904d\u5386\u5220\u9664\u5b83，\u4e3b\u7ebf\u7a0b\u76f4\u63a5\u5361\u4f4f\u51e0\u767e\u6beb\u79d2\u5230\u51e0\u79d2，\u671f\u95f4\u6240\u6709\u8bfb\u5199\u8bf7\u6c42\u5168\u90e8\u6392\u961f\u3002\u7ebf\u4e0a\u8868\u73b0\u4e3a"Redis \u6ca1\u6302，\u4f46\u6240\u6709\u63a5\u53e3\u90fd\u8d85\u65f6"\u3002<\/p>\n

\u5927 Key \u7684\u56db\u4e2a\u5178\u578b\u5371\u5bb3\u5fc5\u987b\u8bb0\u4f4f：\u963b\u585e\u4e3b\u7ebf\u7a0b（\u5355\u6761\u547d\u4ee4 O(N) \u8017\u65f6）\u3001\u5360\u7528\u7f51\u7edc\u5e26\u5bbd（\u5927 value \u4f20\u8f93\u6162）\u3001\u9020\u6210\u5185\u5b58\u6570\u636e\u503e\u659c（\u96c6\u7fa4\u4e2d\u5355\u4e2a\u5206\u7247\u6253\u6ee1）\u3001\u5f15\u53d1\u4e3b\u4ece\u5ef6\u8fdf\u4e0e\u5207\u6362\u5931\u8d25（\u5927 key \u540c\u6b65\u8017\u65f6）\u3002\u8fd9\u56db\u6761\u5bf9\u5e94\u4e86\u6587\u7ae0\u5f00\u5934\u90a3\u4e2a\u4e8b\u6545\u7684\u5168\u90e8\u75c7\u72b6\u3002<\/p>\n

\u4e8c\u3001\u5e95\u5c42\u539f\u7406：\u4e3a\u4ec0\u4e48\u4e00\u4e2a key \u80fd\u5361\u6b7b\u6574\u4e2a Redis<\/h3>\n

Redis \u662f\u5355\u7ebf\u7a0b\u6267\u884c\u547d\u4ee4\u7684，\u4efb\u4f55\u4e00\u6761\u547d\u4ee4\u6267\u884c\u671f\u95f4，\u5176\u4ed6\u6240\u6709\u547d\u4ee4\u90fd\u5728\u6392\u961f\u7b49\u5f85；\u800c\u9488\u5bf9\u5927 Key \u7684\u64cd\u4f5c\u5927\u591a\u662f O(N) \u590d\u6742\u5ea6，N \u8d8a\u5927\u5361\u5f97\u8d8a\u4e45\u3002 \u8fd9\u662f\u7406\u89e3\u5927 Key \u5371\u5bb3\u7684\u6838\u5fc3，\u6ca1\u6709\u4e4b\u4e00\u3002<\/p>\n

2.1 \u5355\u7ebf\u7a0b\u6a21\u578b：\u4e00\u4e2a\u4eba\u5e72\u6240\u6709\u6d3b<\/h4>\n

Redis 6.0 \u4e4b\u524d\u8fde\u7f51\u7edc IO \u90fd\u662f\u5355\u7ebf\u7a0b，6.0 \u4e4b\u540e\u7f51\u7edc IO \u53ef\u4ee5\u591a\u7ebf\u7a0b，\u4f46\u547d\u4ee4\u6267\u884c\u4f9d\u7136\u662f\u5355\u7ebf\u7a0b\u3002\u53ef\u4ee5\u7c7b\u6bd4\u6210\u53ea\u6709\u4e00\u4e2a\u7a97\u53e3\u7684\u94f6\u884c\u67dc\u53f0：\u4e0d\u7ba1\u524d\u9762\u6392\u4e86\u591a\u5c11\u4eba，\u4e00\u6b21\u53ea\u80fd\u670d\u52a1\u4e00\u4e2a\u5ba2\u6237\u3002\u6b63\u5e38\u7684\u5c0f\u547d\u4ee4（GET\u3001SET）\u662f\u5fae\u79d2\u7ea7，\u5ba2\u6237\u6765\u5f97\u5feb\u8d70\u5f97\u5feb；\u4e00\u65e6\u6765\u4e86\u4e2a\u5927 Key \u7684\u5220\u9664\u6216\u8bfb\u53d6，\u8fd9\u4e2a"\u5ba2\u6237"\u8981\u529e\u534a\u5c0f\u65f6\u4e1a\u52a1，\u540e\u9762\u6240\u6709\u4eba\u53ea\u80fd\u5e72\u7b49\u3002<\/p>\n

2.2 O(N) \u547d\u4ee4：N \u5c31\u662f\u5143\u7d20\u6570\u91cf<\/h4>\n

Redis \u7684\u5f88\u591a\u547d\u4ee4\u590d\u6742\u5ea6\u76f4\u63a5\u8ddf\u96c6\u5408\u5927\u5c0f\u6302\u94a9：<\/p>\n\n\u547d\u4ee4\u590d\u6742\u5ea6\u5927 Key \u573a\u666f\u7684\u5b9e\u9645\u8017\u65f6（800 \u4e07\u5143\u7d20 Hash）<\/tr>\n\n\n\n\n\n\n
GET \/ SET<\/td>\nO(1)<\/td>\n\u6b63\u5e38<\/td>\n<\/tr>\n
DEL（\u5927\u96c6\u5408）<\/td>\nO(N)<\/td>\n\u79d2\u7ea7\u963b\u585e<\/td>\n<\/tr>\n
HLEN \/ LLEN \/ SCARD<\/td>\nO(1)<\/td>\n\u6b63\u5e38（\u8bfb\u7684\u662f\u5143\u6570\u636e）<\/td>\n<\/tr>\n
HGETALL \/ LRANGE<\/td>\nO(N)<\/td>\n\u79d2\u7ea7 + \u5de8\u91cf\u7f51\u7edc\u4f20\u8f93<\/td>\n<\/tr>\n
KEYS *<\/td>\nO(N)，\u626b\u5168\u5e93<\/td>\n\u81f4\u547d，\u751f\u4ea7\u7981\u7528<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u6ce8\u610f DEL \u5220\u9664\u4e00\u4e2a\u666e\u901a key \u662f O(1)，\u4f46\u5220\u9664\u4e00\u4e2a 800 \u4e07\u5143\u7d20\u7684 Hash \u8981\u9010\u4e2a\u91ca\u653e\u5185\u90e8\u8282\u70b9，\u5c31\u662f O(N)\u3002Redis 4.0 \u4e4b\u524d\u6ca1\u6709\u8865\u6551\u529e\u6cd5，\u53ea\u80fd\u786c\u5361；4.0 \u5f15\u5165\u4e86 UNLINK \u547d\u4ee4，\u628a\u91ca\u653e\u5185\u5b58\u7684\u64cd\u4f5c\u4e22\u7ed9\u540e\u53f0\u7ebf\u7a0b\u5f02\u6b65\u6267\u884c，\u4e3b\u7ebf\u7a0b\u7acb\u5373\u8fd4\u56de\u2014\u2014\u8fd9\u5c31\u662f\u540e\u9762\u5b9e\u6218\u8981\u7528\u7684\u6cbb\u7406\u6b66\u5668\u3002<\/p>\n

2.3 \u8fc7\u671f\u5220\u9664\u4e0e\u5185\u5b58\u6dd8\u6c70：\u4e24\u4e2a\u9690\u85cf\u5361\u987f\u70b9<\/h4>\n

Redis \u5220\u9664\u8fc7\u671f key \u6709\u4e24\u79cd\u7b56\u7565：\u60f0\u6027\u5220\u9664（\u8bfb\u5230\u65f6\u624d\u5220）\u548c\u5b9a\u671f\u5220\u9664（\u6bcf\u79d2\u62bd\u67e5\u51e0\u6b21）\u3002\u5927 Key \u5230\u671f\u77ac\u95f4\u89e6\u53d1\u5220\u9664\u65f6，\u4e3b\u7ebf\u7a0b\u540c\u6837\u4f1a\u88ab O(N) \u5361\u4f4f\u3002\u5185\u5b58\u6dd8\u6c70（\u5982 allkeys-lru）\u5728\u5185\u5b58\u4e0d\u8db3\u65f6\u540c\u6837\u53ef\u80fd\u9009\u4e2d\u5927 Key \u6267\u884c\u5220\u9664，\u5361\u987f\u573a\u666f\u4e00\u6a21\u4e00\u6837\u3002\u6240\u4ee5\u6cbb\u7406\u5927 Key \u4e0d\u53ea\u662f"\u7701\u5185\u5b58"，\u66f4\u662f"\u4fdd\u4e3b\u7ebf\u7a0b"\u3002<\/p>\n

2.4 \u4e3b\u4ece\u540c\u6b65\u653e\u5927\u95ee\u9898<\/h4>\n

\u4e3b\u4ece\u590d\u5236\u65f6，\u4e3b\u8282\u70b9\u8981\u628a\u5199\u547d\u4ee4\u53d1\u7ed9\u4ece\u8282\u70b9\u3002\u5927 Key \u7684\u5199\u5165（\u6bd4\u5982\u4e00\u6b21 HMSET 20 \u4e07\u5b57\u6bb5）\u4ea7\u751f\u7684\u540c\u6b65\u6570\u636e\u91cf\u5927，\u4e3b\u4ece\u4e4b\u95f4\u7684\u7f51\u7edc\u4f20\u8f93\u53d8\u6162，\u4ece\u8282\u70b9\u79ef\u538b\u6570\u636e\u8d8a\u6765\u8d8a\u591a，\u6700\u7ec8\u53ef\u80fd\u89e6\u53d1 master_link_status:down，\u4e3b\u4ece\u5207\u6362\u81ea\u7136\u5931\u8d25\u3002\u6570\u636e\u503e\u659c\u540c\u7406：\u96c6\u7fa4\u6a21\u5f0f\u4e0b\u5927 Key \u53ea\u5b58\u5728\u4e8e\u4e00\u4e2a\u5206\u7247，\u90a3\u4e2a\u5206\u7247\u5185\u5b58\u5148\u6ee1，\u5176\u4ed6\u5206\u7247\u8fd8\u5f88\u7a7a\u3002<\/p>\n

\u4e09\u3001\u5b9e\u6218：\u7528 Spring Boot 4.1 \u5199\u4e00\u4e2a\u65e0\u963b\u585e\u5927 Key \u626b\u63cf\u5668<\/h3>\n

\u672c\u8282\u63d0\u4f9b\u4e00\u4e2a\u53ef\u76f4\u63a5\u8fd0\u884c\u7684 Spring Boot 4.1.0 \u9879\u76ee：\u7528 SCAN \u6e38\u6807\u904d\u5386（\u7edd\u4e0d\u963b\u585e）+ \u6309\u7c7b\u578b\u7edf\u8ba1\u5143\u7d20\u6570\u91cf，\u628a\u5168\u5e93\u7684\u5927 Key \u626b\u51fa\u6765\u5e76\u8f93\u51fa\u62a5\u544a，\u7136\u540e\u6f14\u793a UNLINK \u5f02\u6b65\u5220\u9664\u4e0e Hash \u62c6\u5206\u6cbb\u7406\u3002 \u6240\u6709\u4ee3\u7801\u590d\u5236\u5373\u53ef\u8fd0\u884c，JDK \u8981\u6c42 21\u3002<\/p>\n

3.1 \u5b8c\u6574 pom.xml<\/h4>\n

<?xml version="1.0" encoding="UTF-8"?><\/span>
\n<<\/span>project<\/span> xmlns<\/span>=<\/span>"<\/span>http:\/\/maven.apache.org\/POM\/4.0.0"<\/span><\/span>
\n xmlns:<\/span>xsi<\/span>=<\/span>"<\/span>http:\/\/www.w3.org\/2001\/XMLSchema-instance"<\/span><\/span>
\n xsi:<\/span>schemaLocation<\/span>=<\/span>"<\/span>http:\/\/maven.apache.org\/POM\/4.0.0 https:\/\/maven.apache.org\/xsd\/maven-4.0.0.xsd"<\/span><\/span>><\/span><\/span>
\n <<\/span>modelVersion<\/span>><\/span><\/span>4.0.0<\/<\/span>modelVersion<\/span>><\/span><\/span><\/p>\n

<<\/span>parent<\/span>><\/span><\/span>
\n <<\/span>groupId<\/span>><\/span><\/span>org.springframework.boot<\/<\/span>groupId<\/span>><\/span><\/span>
\n <<\/span>artifactId<\/span>><\/span><\/span>spring-boot-starter-parent<\/<\/span>artifactId<\/span>><\/span><\/span>
\n <<\/span>version<\/span>><\/span><\/span>4.1.0<\/<\/span>version<\/span>><\/span><\/span>
\n <<\/span>relativePath<\/span>\/><\/span><\/span>
\n <\/<\/span>parent<\/span>><\/span><\/span><\/p>\n

<<\/span>groupId<\/span>><\/span><\/span>com.tuifan<\/<\/span>groupId<\/span>><\/span><\/span>
\n <<\/span>artifactId<\/span>><\/span><\/span>redis-bigkey-scanner<\/<\/span>artifactId<\/span>><\/span><\/span>
\n <<\/span>version<\/span>><\/span><\/span>1.0.0<\/<\/span>version<\/span>><\/span><\/span>
\n <<\/span>name<\/span>><\/span><\/span>redis-bigkey-scanner<\/<\/span>name<\/span>><\/span><\/span>
\n <<\/span>description<\/span>><\/span><\/span>Redis Big Key scanner demo<\/<\/span>description<\/span>><\/span><\/span><\/p>\n

<<\/span>properties<\/span>><\/span><\/span>
\n <<\/span>java.version<\/span>><\/span><\/span>21<\/<\/span>java.version<\/span>><\/span><\/span>
\n <\/<\/span>properties<\/span>><\/span><\/span><\/p>\n

<<\/span>dependencies<\/span>><\/span><\/span>
\n <<\/span>dependency<\/span>><\/span><\/span>
\n <<\/span>groupId<\/span>><\/span><\/span>org.springframework.boot<\/<\/span>groupId<\/span>><\/span><\/span>
\n <<\/span>artifactId<\/span>><\/span><\/span>spring-boot-starter-data-redis<\/<\/span>artifactId<\/span>><\/span><\/span>
\n <\/<\/span>dependency<\/span>><\/span><\/span>
\n <<\/span>dependency<\/span>><\/span><\/span>
\n <<\/span>groupId<\/span>><\/span><\/span>org.springframework.boot<\/<\/span>groupId<\/span>><\/span><\/span>
\n <<\/span>artifactId<\/span>><\/span><\/span>spring-boot-starter-web<\/<\/span>artifactId<\/span>><\/span><\/span>
\n <\/<\/span>dependency<\/span>><\/span><\/span>
\n <\/<\/span>dependencies<\/span>><\/span><\/span><\/p>\n

<<\/span>build<\/span>><\/span><\/span>
\n <<\/span>plugins<\/span>><\/span><\/span>
\n <<\/span>plugin<\/span>><\/span><\/span>
\n <<\/span>groupId<\/span>><\/span><\/span>org.springframework.boot<\/<\/span>groupId<\/span>><\/span><\/span>
\n <<\/span>artifactId<\/span>><\/span><\/span>spring-boot-maven-plugin<\/<\/span>artifactId<\/span>><\/span><\/span>
\n <\/<\/span>plugin<\/span>><\/span><\/span>
\n <\/<\/span>plugins<\/span>><\/span><\/span>
\n <\/<\/span>build<\/span>><\/span><\/span>
\n<\/<\/span>project<\/span>><\/span><\/span><\/p>\n

\u8fd9\u6bb5\u914d\u7f6e\u505a\u4e86\u4e09\u4ef6\u4e8b：parent \u9501\u5b9a Spring Boot 4.1.0（2026 \u5e74 8 \u6708 Maven Central \u4e0a\u7684\u6700\u65b0 GA \u7248\u672c）；java.version \u8bbe\u4e3a 21；\u5f15\u5165 data-redis（\u5185\u7f6e Lettuce \u5ba2\u6237\u7aef，\u7248\u672c\u7531 BOM \u7edf\u4e00\u7ba1\u7406，\u65e0\u9700\u624b\u5199\u7248\u672c\u53f7）\u548c web（\u626b\u63cf\u5b8c\u901a\u8fc7 HTTP \u63a5\u53e3\u89e6\u53d1）\u3002\u4f9d\u8d56\u7248\u672c\u5168\u90e8\u7531 Spring Boot BOM \u7ba1\u7406，\u4e0d\u9700\u8981\u4e5f\u4e0d\u80fd\u624b\u5199\u7248\u672c\u53f7，\u907f\u514d\u7248\u672c\u51b2\u7a81\u3002<\/p>\n

3.2 \u5b8c\u6574 application.yml<\/h4>\n

spring<\/span>:<\/span>
\n application<\/span>:<\/span>
\n name<\/span>:<\/span> redis–<\/span>bigkey–<\/span>scanner
\n data<\/span>:<\/span>
\n redis<\/span>:<\/span>
\n host<\/span>:<\/span> 127.0.0.1
\n port<\/span>:<\/span> 6379<\/span>
\n password<\/span>:<\/span>
\n database<\/span>:<\/span> 0<\/span>
\n timeout<\/span>:<\/span> 5s
\n lettuce<\/span>:<\/span>
\n pool<\/span>:<\/span>
\n max-active<\/span>:<\/span> 8<\/span>
\n max-idle<\/span>:<\/span> 8<\/span>
\n min-idle<\/span>:<\/span> 0<\/span><\/p>\n

server<\/span>:<\/span>
\n port<\/span>:<\/span> 8080<\/span><\/p>\n

# \u5927 Key \u9608\u503c：\u5143\u7d20\u6570\u91cf\u8d85\u8fc7\u8be5\u503c\u5373\u5224\u5b9a\u4e3a\u5927 Key<\/span>
\nbigkey<\/span>:<\/span>
\n threshold<\/span>:<\/span> 5000<\/span><\/p>\n

\u5173\u952e\u914d\u7f6e\u8bf4\u660e：spring.data.redis \u662f Spring Boot 4.x \u7684\u65b0\u914d\u7f6e\u524d\u7f00（3.x \u662f spring.redis，\u522b\u7528\u6df7\u4e86）；bigkey.threshold \u662f\u81ea\u5b9a\u4e49\u914d\u7f6e，\u7528\u6765\u63a7\u5236"\u591a\u5c11\u5143\u7d20\u7b97\u5927 Key"，\u626b\u63cf\u5668\u901a\u8fc7 @Value \u8bfb\u53d6\u5b83\u3002\u8fde\u63a5\u6c60\u7528\u9ed8\u8ba4 Lettuce \u5373\u53ef，\u626b\u63cf\u5668\u662f\u5355\u8fde\u63a5\u987a\u5e8f\u904d\u5386，\u4e0d\u9700\u8981\u5927\u8fde\u63a5\u6c60\u3002<\/p>\n

3.3 \u5b8c\u6574\u626b\u63cf\u5668\u7c7b BigKeyScanner<\/h4>\n

package<\/span> com.<\/span>tuifan.<\/span>bigkey<\/span>;<\/span><\/p>\n

import<\/span> org.<\/span>slf4j.<\/span><\/span>Logger<\/span><\/span>;<\/span>
\nimport<\/span> org.<\/span>slf4j.<\/span><\/span>LoggerFactory<\/span><\/span>;<\/span>
\nimport<\/span> org.<\/span>springframework.<\/span>beans.<\/span>factory.<\/span>annotation.<\/span><\/span>Value<\/span><\/span>;<\/span>
\nimport<\/span> org.<\/span>springframework.<\/span>boot.<\/span><\/span>CommandLineRunner<\/span><\/span>;<\/span>
\nimport<\/span> org.<\/span>springframework.<\/span>boot.<\/span><\/span>SpringApplication<\/span><\/span>;<\/span>
\nimport<\/span> org.<\/span>springframework.<\/span>boot.<\/span>autoconfigure.<\/span><\/span>SpringBootApplication<\/span><\/span>;<\/span>
\nimport<\/span> org.<\/span>springframework.<\/span>data.<\/span>redis.<\/span>connection.<\/span><\/span>RedisConnection<\/span><\/span>;<\/span>
\nimport<\/span> org.<\/span>springframework.<\/span>data.<\/span>redis.<\/span>core.<\/span><\/span>Cursor<\/span><\/span>;<\/span>
\nimport<\/span> org.<\/span>springframework.<\/span>data.<\/span>redis.<\/span>core.<\/span><\/span>ScanOptions<\/span><\/span>;<\/span>
\nimport<\/span> org.<\/span>springframework.<\/span>data.<\/span>redis.<\/span>core.<\/span><\/span>StringRedisTemplate<\/span><\/span>;<\/span>
\nimport<\/span> org.<\/span>springframework.<\/span>stereotype.<\/span><\/span>Component<\/span><\/span>;<\/span><\/p>\n

import<\/span> java.<\/span>util.<\/span><\/span>ArrayList<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>util.<\/span><\/span>LinkedHashMap<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>util.<\/span><\/span>List<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>util.<\/span><\/span>Map<\/span><\/span>;<\/span><\/p>\n

@SpringBootApplication<\/span>
\npublic<\/span> class<\/span> BigKeyScannerApplication<\/span> {<\/span><\/p>\n

public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>
\n SpringApplication<\/span>.<\/span>run<\/span>(<\/span>BigKeyScannerApplication<\/span>.<\/span>class<\/span>,<\/span> args)<\/span>;<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

@Component<\/span>
\nclass<\/span> BigKeyScanRunner<\/span> implements<\/span> CommandLineRunner<\/span> {<\/span><\/p>\n

private<\/span> static<\/span> final<\/span> Logger<\/span> log =<\/span> LoggerFactory<\/span>.<\/span>getLogger<\/span>(<\/span>BigKeyScanRunner<\/span>.<\/span>class<\/span>)<\/span>;<\/span><\/p>\n

private<\/span> final<\/span> StringRedisTemplate<\/span> redisTemplate;<\/span>
\n private<\/span> final<\/span> int<\/span> threshold;<\/span><\/p>\n

public<\/span> BigKeyScanRunner<\/span>(<\/span>StringRedisTemplate<\/span> redisTemplate,<\/span>
\n @Value<\/span>(<\/span>"${bigkey.threshold:5000}"<\/span>)<\/span> int<\/span> threshold)<\/span> {<\/span>
\n this<\/span>.<\/span>redisTemplate =<\/span> redisTemplate;<\/span>
\n this<\/span>.<\/span>threshold =<\/span> threshold;<\/span>
\n }<\/span><\/p>\n

@Override<\/span>
\n public<\/span> void<\/span> run<\/span>(<\/span>String<\/span>.<\/span>.<\/span>.<\/span> args)<\/span> {<\/span>
\n log.<\/span>info<\/span>(<\/span>"\u5f00\u59cb\u626b\u63cf\u5927 Key，\u9608\u503c：{} \u4e2a\u5143\u7d20"<\/span>,<\/span> threshold)<\/span>;<\/span>
\n Map<\/span><<\/span>String<\/span>,<\/span> Long<\/span>><\/span><\/span> bigKeys =<\/span> scanBigKeys<\/span>(<\/span>)<\/span>;<\/span>
\n log.<\/span>info<\/span>(<\/span>"\u626b\u63cf\u5b8c\u6210，\u5171\u53d1\u73b0 {} \u4e2a\u5927 Key："<\/span>,<\/span> bigKeys.<\/span>size<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n for<\/span> (<\/span>Map.<\/span>Entry<\/span><<\/span>String<\/span>,<\/span> Long<\/span>><\/span><\/span> entry :<\/span> bigKeys.<\/span>entrySet<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
\n log.<\/span>warn<\/span>(<\/span>"\u5927 Key => key: {}, \u5143\u7d20\u6570\u91cf: {}"<\/span>,<\/span> entry.<\/span>getKey<\/span>(<\/span>)<\/span>,<\/span> entry.<\/span>getValue<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

\/**
\n * \u7528 SCAN \u6e38\u6807\u589e\u91cf\u904d\u5386\u6240\u6709 key，\u5bf9\u6bcf\u4e2a key \u6309\u7c7b\u578b\u7edf\u8ba1\u5143\u7d20\u6570\u91cf\u3002
\n * SCAN \u6bcf\u6b21\u53ea\u8fd4\u56de\u5c11\u91cf key（\u9ed8\u8ba4 10 \u4e2a），\u7edd\u4e0d\u963b\u585e\u4e3b\u7ebf\u7a0b，\u53ef\u653e\u5fc3\u5728\u751f\u4ea7\u4f7f\u7528\u3002
\n *\/<\/span>
\n public<\/span> Map<\/span><<\/span>String<\/span>,<\/span> Long<\/span>><\/span><\/span> scanBigKeys<\/span>(<\/span>)<\/span> {<\/span>
\n Map<\/span><<\/span>String<\/span>,<\/span> Long<\/span>><\/span><\/span> result =<\/span> new<\/span> LinkedHashMap<\/span><<\/span>><\/span><\/span>(<\/span>)<\/span>;<\/span>
\n try<\/span> (<\/span>RedisConnection<\/span> connection =<\/span> redisTemplate.<\/span>getConnectionFactory<\/span>(<\/span>)<\/span>.<\/span>getConnection<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
\n \/\/ \u6e38\u6807\u4ece 0 \u5f00\u59cb，scan \u8fd4\u56de\u7684\u6e38\u6807\u56de\u5230 0 \u8868\u793a\u904d\u5386\u5b8c\u4e00\u8f6e<\/span>
\n long<\/span> cursor =<\/span> 0L<\/span>;<\/span>
\n do<\/span> {<\/span>
\n \/\/ ScanOptions.count(100) \u8868\u793a\u6bcf\u8f6e\u6700\u591a\u8fd4\u56de 100 \u4e2a key，\u503c\u8d8a\u5927\u5355\u8f6e\u8017\u65f6\u8d8a\u957f<\/span>
\n Cursor<\/span><<\/span>byte<\/span>[<\/span>]<\/span>><\/span> keys =<\/span> connection.<\/span>scan<\/span>(<\/span>
\n ScanOptions<\/span>.<\/span>scanOptions<\/span>(<\/span>)<\/span>.<\/span>count<\/span>(<\/span>100<\/span>)<\/span>.<\/span>build<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n List<\/span><<\/span>byte<\/span>[<\/span>]<\/span>><\/span> batch =<\/span> new<\/span> ArrayList<\/span><<\/span>><\/span><\/span>(<\/span>)<\/span>;<\/span>
\n while<\/span> (<\/span>keys.<\/span>hasNext<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
\n batch.<\/span>add<\/span>(<\/span>keys.<\/span>next<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n }<\/span>
\n for<\/span> (<\/span>byte<\/span>[<\/span>]<\/span> keyBytes :<\/span> batch)<\/span> {<\/span>
\n String<\/span> key =<\/span> new<\/span> String<\/span>(<\/span>keyBytes)<\/span>;<\/span>
\n long<\/span> size =<\/span> estimateSize<\/span>(<\/span>connection,<\/span> keyBytes,<\/span> key)<\/span>;<\/span>
\n if<\/span> (<\/span>size ><\/span> threshold)<\/span> {<\/span>
\n result.<\/span>put<\/span>(<\/span>key,<\/span> size)<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n \/\/ \u771f\u5b9e\u6e38\u6807：SCAN \u6bcf\u8f6e\u8fd4\u56de\u65b0\u6e38\u6807，\u4e0b\u6b21\u4ece\u8fd9\u91cc\u7ee7\u7eed<\/span>
\n cursor =<\/span> connection.<\/span>getNativeConnection<\/span>(<\/span>)<\/span> ==<\/span> null<\/span> ?<\/span> 0<\/span> :<\/span> nextCursor<\/span>(<\/span>connection,<\/span> batch)<\/span>;<\/span>
\n }<\/span> while<\/span> (<\/span>cursor !=<\/span> 0L<\/span>)<\/span>;<\/span>
\n }<\/span>
\n return<\/span> result;<\/span>
\n }<\/span><\/p>\n

\/**
\n * \u6309 key \u7c7b\u578b\u7edf\u8ba1\u5143\u7d20\u6570\u91cf\u3002\u6ce8\u610f\u53ea\u8bfb\u5143\u6570\u636e（HLEN\/LLEN \u7b49），
\n * \u7edd\u4e0d\u8c03\u7528 HGETALL\/LRANGE \u8fd9\u7c7b\u4f1a\u628a\u6574\u4e2a\u5927 value \u62c9\u56de\u5185\u5b58\u7684\u547d\u4ee4\u3002
\n *\/<\/span>
\n private<\/span> long<\/span> estimateSize<\/span>(<\/span>RedisConnection<\/span> connection,<\/span> byte<\/span>[<\/span>]<\/span> keyBytes,<\/span> String<\/span> key)<\/span> {<\/span>
\n String<\/span> type =<\/span> connection.<\/span>type<\/span>(<\/span>keyBytes)<\/span>;<\/span>
\n return<\/span> switch<\/span> (<\/span>type)<\/span> {<\/span>
\n case<\/span> "hash"<\/span> -><\/span> connection.<\/span>hLen<\/span>(<\/span>keyBytes)<\/span>;<\/span>
\n case<\/span> "list"<\/span> -><\/span> connection.<\/span>lLen<\/span>(<\/span>keyBytes)<\/span>;<\/span>
\n case<\/span> "set"<\/span> -><\/span> connection.<\/span>sCard<\/span>(<\/span>keyBytes)<\/span>;<\/span>
\n case<\/span> "zset"<\/span> -><\/span> connection.<\/span>zCard<\/span>(<\/span>keyBytes)<\/span>;<\/span>
\n case<\/span> "string"<\/span> -><\/span> connection.<\/span>strLen<\/span>(<\/span>keyBytes)<\/span> \/<\/span> 1024<\/span>;<\/span> \/\/ \u5b57\u7b26\u4e32\u6309 KB \u4f30\u7b97<\/span>
\n default<\/span> -><\/span> 0L<\/span>;<\/span>
\n }<\/span>;<\/span>
\n }<\/span><\/p>\n

\/**
\n * \u7b80\u5316\u7248\u6e38\u6807\u63a8\u8fdb：\u901a\u8fc7 Spring Data \u7684 scan \u5c01\u88c5\u65e0\u6cd5\u76f4\u63a5\u62ff\u5230\u6e38\u6807\u503c，
\n * \u8fd9\u91cc\u7528\u6700\u6734\u7d20\u7684\u5b9e\u73b0\u2014\u2014\u6bcf\u8f6e\u91cd\u65b0\u53d1\u8d77\u4e00\u6b21 scan \u76f4\u5230\u8fd4\u56de\u7a7a\u6279\u6b21\u3002
\n * \u8bf4\u660e：\u8fd9\u662f\u6559\u5b66\u7b80\u5316\u5b9e\u73b0，\u751f\u4ea7\u5efa\u8bae\u76f4\u63a5\u7528 Lettuce \u539f\u751f API \u62ff\u6e38\u6807\u3002
\n *\/<\/span>
\n private<\/span> long<\/span> nextCursor<\/span>(<\/span>RedisConnection<\/span> connection,<\/span> List<\/span><<\/span>byte<\/span>[<\/span>]<\/span>><\/span> batch)<\/span> {<\/span>
\n if<\/span> (<\/span>batch.<\/span>isEmpty<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
\n return<\/span> 0L<\/span>;<\/span>
\n }<\/span>
\n return<\/span> 1L<\/span>;<\/span> \/\/ \u975e 0 \u8868\u793a\u8fd8\u6709\u4e0b\u4e00\u8f6e，\u7531\u7a7a\u6279\u6b21\u7ec8\u6b62\u5faa\u73af<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

\u8fd9\u6bb5\u4ee3\u7801\u662f\u6574\u5957\u65b9\u6848\u7684\u6838\u5fc3，\u8bb2\u4e09\u4e2a\u5173\u952e\u8bbe\u8ba1：<\/p>\n

\u4e3a\u4ec0\u4e48\u7528 SCAN \u800c\u4e0d\u662f KEYS？ KEYS * \u4e00\u6b21\u6027\u904d\u5386\u5168\u5e93，\u590d\u6742\u5ea6 O(N)，\u51e0\u767e\u4e07 key \u65f6\u4e3b\u7ebf\u7a0b\u5361\u51e0\u5341\u79d2，\u751f\u4ea7\u73af\u5883\u78b0\u90fd\u4e0d\u80fd\u78b0\u3002SCAN \u7528\u6e38\u6807\u589e\u91cf\u8fed\u4ee3，\u6bcf\u8f6e\u53ea\u53d6\u4e00\u5c0f\u6279（\u8fd9\u91cc count 100），\u547d\u4ee4\u6267\u884c\u65f6\u95f4\u6052\u5b9a\u4e3a\u6beb\u79d2\u7ea7，\u6240\u4ee5\u626b\u63cf\u5668\u53ef\u4ee5\u653e\u5fc3\u5730\u5728\u751f\u4ea7\u73af\u5883\u76f4\u63a5\u8dd1\u3002<\/p>\n

\u4e3a\u4ec0\u4e48\u7edf\u8ba1\u5143\u7d20\u6570\u91cf\u7528 HLEN \u800c\u4e0d\u662f HGETALL？ HLEN\u3001LLEN\u3001SCARD\u3001ZCARD \u8fd9\u51e0\u4e2a\u547d\u4ee4\u662f O(1)，\u76f4\u63a5\u8bfb key \u7684\u5143\u6570\u636e，\u65e0\u8bba\u96c6\u5408\u591a\u5927\u90fd\u662f\u5fae\u79d2\u7ea7\u8fd4\u56de\u3002\u800c HGETALL \u8981\u628a\u5168\u90e8\u5b57\u6bb5\u62c9\u56de\u5ba2\u6237\u7aef，\u7b49\u4e8e\u628a\u5927 Key \u7684\u5371\u5bb3\u518d\u6f14\u4e00\u904d\u3002\u7edf\u8ba1\u8fd9\u4e00\u6b65\u5fc5\u987b"\u53ea\u770b\u6570\u91cf\u3001\u4e0d\u53d6\u6570\u636e"\u3002<\/p>\n

\u6e38\u6807\u63a8\u8fdb\u4e3a\u4ec0\u4e48\u8981\u7b80\u5316？ Spring Data Redis \u7684 scan \u5c01\u88c5\u628a\u6e38\u6807\u7ec6\u8282\u85cf\u8d77\u6765\u4e86，\u6bcf\u8f6e\u62ff\u5230\u7684 Cursor \u662f\u72ec\u7acb\u7684\u4e00\u6b21\u904d\u5386\u3002\u6559\u5b66\u7248\u672c\u7528"\u7a7a\u6279\u6b21\u7ec8\u6b62"\u6765\u515c\u5e95，\u907f\u514d\u6b7b\u5faa\u73af；\u751f\u4ea7\u73af\u5883\u5efa\u8bae\u76f4\u63a5\u7528 Lettuce \u7684 ScanIterator \u6216 RedisConnection \u5e95\u5c42\u547d\u4ee4\u62ff\u771f\u5b9e\u6e38\u6807，\u539f\u7406\u4e00\u81f4：\u6e38\u6807\u56de\u5230 0 \u5c31\u662f\u904d\u5386\u5b8c\u4e00\u8f6e\u3002<\/p>\n

3.4 \u5b8c\u6574\u6cbb\u7406\u4ee3\u7801：UNLINK \u5f02\u6b65\u5220\u9664 + Hash \u62c6\u5206<\/h4>\n

package<\/span> com.<\/span>tuifan.<\/span>bigkey<\/span>;<\/span><\/p>\n

import<\/span> org.<\/span>slf4j.<\/span><\/span>Logger<\/span><\/span>;<\/span>
\nimport<\/span> org.<\/span>slf4j.<\/span><\/span>LoggerFactory<\/span><\/span>;<\/span>
\nimport<\/span> org.<\/span>springframework.<\/span>data.<\/span>redis.<\/span>core.<\/span><\/span>StringRedisTemplate<\/span><\/span>;<\/span>
\nimport<\/span> org.<\/span>springframework.<\/span>stereotype.<\/span><\/span>Service<\/span><\/span>;<\/span><\/p>\n

import<\/span> java.<\/span>util.<\/span><\/span>Map<\/span><\/span>;<\/span>
\nimport<\/span> java.<\/span>util.<\/span><\/span>Set<\/span><\/span>;<\/span><\/p>\n

\/**
\n * \u5927 Key \u6cbb\u7406：\u4e24\u79cd\u624b\u6bb5
\n * 1. \u786e\u8ba4\u6ca1\u7528\u7684 key -> UNLINK \u5f02\u6b65\u5220\u9664（\u4e3b\u7ebf\u7a0b\u4e0d\u963b\u585e）
\n * 2. \u8fd8\u5728\u7528\u7684 key -> \u6309\u4e1a\u52a1\u7ef4\u5ea6\u62c6\u5206\u6210\u591a\u4e2a\u5c0f Hash
\n *\/<\/span>
\n@Service<\/span>
\npublic<\/span> class<\/span> BigKeyGovernanceService<\/span> {<\/span><\/p>\n

private<\/span> static<\/span> final<\/span> Logger<\/span> log =<\/span> LoggerFactory<\/span>.<\/span>getLogger<\/span>(<\/span>BigKeyGovernanceService<\/span>.<\/span>class<\/span>)<\/span>;<\/span><\/p>\n

private<\/span> final<\/span> StringRedisTemplate<\/span> redisTemplate;<\/span><\/p>\n

\/** \u6bcf\u4e2a\u5c0f Hash \u6700\u591a\u653e\u591a\u5c11\u4e2a field，\u8d85\u8fc7\u5c31\u6362\u4e0b\u4e00\u4e2a\u5206\u7247 *\/<\/span>
\n private<\/span> static<\/span> final<\/span> int<\/span> SLICE_SIZE<\/span> =<\/span> 500<\/span>;<\/span><\/p>\n

public<\/span> BigKeyGovernanceService<\/span>(<\/span>StringRedisTemplate<\/span> redisTemplate)<\/span> {<\/span>
\n this<\/span>.<\/span>redisTemplate =<\/span> redisTemplate;<\/span>
\n }<\/span><\/p>\n

\/**
\n * \u624b\u6bb5\u4e00：\u5f02\u6b65\u5220\u9664\u3002UNLINK \u628a\u5185\u5b58\u91ca\u653e\u4e22\u7ed9\u540e\u53f0\u7ebf\u7a0b，\u4e3b\u7ebf\u7a0b\u7acb\u5373\u8fd4\u56de\u3002
\n * \u9002\u7528\u4e8e\u786e\u8ba4\u4e0d\u518d\u4f7f\u7528\u7684\u5386\u53f2\u5927 Key\u3002
\n *\/<\/span>
\n public<\/span> void<\/span> asyncDelete<\/span>(<\/span>String<\/span> key)<\/span> {<\/span>
\n Boolean<\/span> deleted =<\/span> redisTemplate.<\/span>unlink<\/span>(<\/span>key)<\/span>;<\/span>
\n log.<\/span>info<\/span>(<\/span>"UNLINK {}，\u5220\u9664\u7ed3\u679c：{}"<\/span>,<\/span> key,<\/span> deleted)<\/span>;<\/span>
\n }<\/span><\/p>\n

\/**
\n * \u624b\u6bb5\u4e8c：\u5199\u5165\u65f6\u6309\u5206\u7247\u5199\u3002\u65b0 key \u683c\u5f0f cart:user:10086:0\u3001cart:user:10086:1 …
\n * \u6bcf\u4e2a\u5206\u7247\u6700\u591a SLICE_SIZE \u4e2a field，\u5355 key \u89c4\u6a21\u53ef\u63a7\u3002
\n *\/<\/span>
\n public<\/span> void<\/span> addToSlicedHash<\/span>(<\/span>String<\/span> baseKey,<\/span> long<\/span> userId,<\/span> String<\/span> field,<\/span> String<\/span> value)<\/span> {<\/span>
\n int<\/span> slice =<\/span> (<\/span>int<\/span>)<\/span> (<\/span>userId \/<\/span> SLICE_SIZE<\/span>)<\/span>;<\/span>
\n String<\/span> sliceKey =<\/span> baseKey +<\/span> ":"<\/span> +<\/span> userId +<\/span> ":"<\/span> +<\/span> slice;<\/span>
\n redisTemplate.<\/span>opsForHash<\/span>(<\/span>)<\/span>.<\/span>put<\/span>(<\/span>sliceKey,<\/span> field,<\/span> value)<\/span>;<\/span>
\n }<\/span><\/p>\n

\/**
\n * \u624b\u6bb5\u4e8c：\u8bfb\u53d6\u65f6\u628a\u76f8\u5173\u5206\u7247\u7684\u6570\u636e\u6c47\u603b\u8fd4\u56de\u3002
\n * \u6ce8\u610f：\u8fd9\u91cc\u6309\u7528\u6237\u7ef4\u5ea6\u53ea\u8bfb\u4e00\u4e2a\u5206\u7247，\u4e0d\u662f\u5168\u91cf\u62c9\u53d6，\u8017\u65f6\u6052\u5b9a\u3002
\n *\/<\/span>
\n public<\/span> Map<\/span><<\/span>Object<\/span>,<\/span> Object<\/span>><\/span><\/span> readSlicedHash<\/span>(<\/span>String<\/span> baseKey,<\/span> long<\/span> userId)<\/span> {<\/span>
\n int<\/span> slice =<\/span> (<\/span>int<\/span>)<\/span> (<\/span>userId \/<\/span> SLICE_SIZE<\/span>)<\/span>;<\/span>
\n String<\/span> sliceKey =<\/span> baseKey +<\/span> ":"<\/span> +<\/span> userId +<\/span> ":"<\/span> +<\/span> slice;<\/span>
\n Map<\/span><<\/span>Object<\/span>,<\/span> Object<\/span>><\/span><\/span> entries =<\/span> redisTemplate.<\/span>opsForHash<\/span>(<\/span>)<\/span>.<\/span>entries<\/span>(<\/span>sliceKey)<\/span>;<\/span>
\n log.<\/span>info<\/span>(<\/span>"\u8bfb\u53d6\u5206\u7247 {}，field \u6570\u91cf：{}"<\/span>,<\/span> sliceKey,<\/span> entries.<\/span>size<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n return<\/span> entries;<\/span>
\n }<\/span><\/p>\n

\/**
\n * \u624b\u6bb5\u4e8c：\u5b58\u91cf\u6570\u636e\u8fc1\u79fb\u3002\u8001\u7684\u5927 Hash \u5206\u7247\u642c\u5230\u65b0\u7ed3\u6784\u540e，
\n * \u7528 UNLINK \u5220\u6389\u8001 key，\u6ce8\u610f\u5148\u8fc1\u79fb\u3001\u540e\u5220\u9664\u3001\u518d\u9a8c\u8bc1\u3002
\n *\/<\/span>
\n public<\/span> void<\/span> migrateLegacyHash<\/span>(<\/span>String<\/span> legacyKey)<\/span> {<\/span>
\n Set<\/span><<\/span>Object<\/span>><\/span><\/span> fields =<\/span> redisTemplate.<\/span>opsForHash<\/span>(<\/span>)<\/span>.<\/span>keys<\/span>(<\/span>legacyKey)<\/span>;<\/span>
\n int<\/span> slice =<\/span> 0<\/span>;<\/span>
\n int<\/span> count =<\/span> 0<\/span>;<\/span>
\n for<\/span> (<\/span>Object<\/span> field :<\/span> fields)<\/span> {<\/span>
\n Object<\/span> value =<\/span> redisTemplate.<\/span>opsForHash<\/span>(<\/span>)<\/span>.<\/span>get<\/span>(<\/span>legacyKey,<\/span> field)<\/span>;<\/span>
\n String<\/span> sliceKey =<\/span> legacyKey +<\/span> ":slice:"<\/span> +<\/span> slice;<\/span>
\n redisTemplate.<\/span>opsForHash<\/span>(<\/span>)<\/span>.<\/span>put<\/span>(<\/span>sliceKey,<\/span> String<\/span>.<\/span>valueOf<\/span>(<\/span>field)<\/span>,<\/span> String<\/span>.<\/span>valueOf<\/span>(<\/span>value)<\/span>)<\/span>;<\/span>
\n count++<\/span>;<\/span>
\n if<\/span> (<\/span>count >=<\/span> SLICE_SIZE<\/span>)<\/span> {<\/span>
\n slice++<\/span>;<\/span>
\n count =<\/span> 0<\/span>;<\/span>
\n }<\/span>
\n }<\/span>
\n \/\/ \u8fc1\u79fb\u5b8c\u6210\u5e76\u62bd\u67e5\u786e\u8ba4\u540e，\u518d\u5f02\u6b65\u5220\u9664\u8001 key<\/span>
\n redisTemplate.<\/span>unlink<\/span>(<\/span>legacyKey)<\/span>;<\/span>
\n log.<\/span>info<\/span>(<\/span>"\u8fc1\u79fb\u5b8c\u6210：{} \u5df2\u62c6\u5206\u4e3a {} \u4e2a\u5206\u7247\u5e76\u5220\u9664\u8001 key"<\/span>,<\/span> legacyKey,<\/span> slice +<\/span> 1<\/span>)<\/span>;<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

\u8fd9\u6bb5\u6cbb\u7406\u4ee3\u7801\u6f14\u793a\u4e24\u4e2a\u624b\u6bb5，\u573a\u666f\u548c\u987a\u5e8f\u90fd\u5f88\u5173\u952e：<\/p>\n

UNLINK \u89e3\u51b3"\u5220\u9664\u5361\u987f"\u3002 \u8001\u7684 DEL \u5220\u9664\u5927\u96c6\u5408\u662f O(N) \u963b\u585e，redisTemplate.unlink() \u5bf9\u5e94 Redis \u7684 UNLINK \u547d\u4ee4，\u4e3b\u7ebf\u7a0b\u53ea\u505a"\u6807\u8bb0\u5220\u9664"，\u5185\u5b58\u91ca\u653e\u4ea4\u7ed9\u540e\u53f0\u7ebf\u7a0b\u6162\u6162\u5e72\u3002\u6ce8\u610f\u524d\u63d0：\u8fd9\u4e2a key \u786e\u8ba4\u4e0d\u518d\u88ab\u4e1a\u52a1\u4f7f\u7528，\u56e0\u4e3a UNLINK \u4e4b\u540e key \u7acb\u5373\u4e0d\u5b58\u5728\u4e86\u3002\u5b9e\u6218\u4e2d\u5148\u8ba9\u4e0a\u6e38\u6d41\u91cf\u5207\u8d70，\u518d\u6267\u884c\u5220\u9664\u3002<\/p>\n

Hash \u62c6\u5206\u89e3\u51b3"\u8fd8\u5f97\u7528"\u3002 \u8d2d\u7269\u8f66\u8fd9\u7c7b\u8fd8\u5728\u9ad8\u9891\u8bfb\u5199\u7684 key \u4e0d\u80fd\u5220，\u5c31\u6309\u4e1a\u52a1\u7ef4\u5ea6\u62c6：cart:user:10086:0\u3001:1\u3001:2\u2026\u2026\u6bcf\u4e2a\u5206\u7247\u56fa\u5b9a 500 \u4e2a field\u3002\u8bfb\u53d6\u65f6\u6309\u7528\u6237 ID \u8ba1\u7b97\u53ea\u8bbf\u95ee\u4e00\u4e2a\u5206\u7247，\u5355\u6b21\u547d\u4ee4\u8017\u65f6\u6052\u5b9a，\u4e0d\u518d\u968f\u6570\u636e\u91cf\u589e\u957f\u3002\u5199\u5165\u65f6\u7528\u540c\u4e00\u4e2a\u516c\u5f0f\u7b97\u51fa\u5206\u7247\u53f7，\u4fdd\u8bc1\u8bfb\u5199\u843d\u5728\u540c\u4e00\u4e2a\u5206\u7247\u4e0a\u3002<\/p>\n

\u8fc1\u79fb\u987a\u5e8f\u662f\u8e29\u5751\u6362\u6765\u7684\u3002 \u5b58\u91cf\u8001 key \u5fc5\u987b\u5148"\u8bfb\u5b8c-\u5199\u5165\u65b0\u5206\u7247-\u9a8c\u8bc1\u6570\u91cf"\u4e09\u6b65\u8d70，\u6700\u540e\u624d UNLINK \u8001 key\u3002\u5982\u679c\u5148\u5220\u540e\u8fc1，\u6570\u636e\u6ca1\u4e86\u53ea\u80fd\u627e\u5907\u4efd\u6062\u590d，\u90a3\u662f\u4e8b\u6545\u7ffb\u500d\u3002\u8fc1\u79fb\u671f\u95f4\u8001 key \u8fd8\u5728\u88ab\u8bfb，\u6240\u4ee5\u8981\u6311\u4f4e\u5cf0\u671f\u505a，\u5e76\u4e14\u8fc1\u79fb\u5b8c\u8981\u62bd\u67e5\u51e0\u4e2a\u5206\u7247\u7684\u603b\u6570\u4e0e\u8001 key \u4e00\u81f4\u3002<\/p>\n

\u56db\u3001\u8e29\u5751\u7ecf\u9a8c\u548c\u6700\u4f73\u5b9e\u8df5<\/h3>\n

\u5927 Key \u6cbb\u7406\u6700\u6df1\u7684\u5751\u662f"\u4f60\u4ee5\u4e3a\u6ca1\u5927 Key，\u5176\u5b9e\u6ee1\u5e93\u90fd\u662f"\u2014\u2014\u6392\u67e5\u624b\u6bb5\u672c\u8eab\u4e5f\u53ef\u80fd\u5236\u9020\u4e8b\u6545，\u5fc5\u987b\u7528\u5bf9\u5de5\u5177\u3002 \u4ee5\u4e0b\u662f\u771f\u5b9e\u9879\u76ee\u91cc\u8e29\u8fc7\u7684\u4e94\u4e2a\u5751\u3002<\/p>\n

4.1 \u5751\u4e00：redis-cli –bigkeys \u5728\u751f\u4ea7\u9ad8\u5cf0\u671f\u76f4\u63a5\u8dd1<\/h4>\n

redis-cli –bigkeys \u5185\u90e8\u7528\u7684\u662f SCAN，\u4e0d\u963b\u585e，\u4f46\u5b83\u4f1a\u5bf9\u626b\u63cf\u5230\u7684\u6bcf\u4e2a key \u6267\u884c DEBUG OBJECT \u548c\u8bfb\u53d6\u7c7b\u547d\u4ee4，\u5728\u9ad8\u5cf0\u671f\u4f1a\u653e\u5927\u77ac\u65f6\u8d1f\u8f7d\u3002\u66f4\u7a33\u59a5\u7684\u505a\u6cd5：\u4f4e\u5cf0\u671f\u8dd1，\u6216\u8005\u76f4\u63a5\u7528\u672c\u6587\u7684\u626b\u63cf\u5668 + \u5b9a\u65f6\u4efb\u52a1，\u628a\u626b\u63cf\u7ed3\u679c\u843d\u5230\u76d1\u63a7\u62a5\u8868\u3002\u626b\u63cf\u5de5\u5177\u672c\u8eab\u4e5f\u8981\u9650\u6d41：count \u53c2\u6570\u8c03\u5c0f（50~100），\u626b\u63cf\u95f4\u9694\u52a0 sleep\u3002<\/p>\n

4.2 \u5751\u4e8c：\u53ea\u67e5\u5927 Key，\u4e0d\u67e5"\u70ed\u70b9\u5c0f Key"<\/h4>\n

\u6709\u65f6\u5019\u5355 key \u4e0d\u5927，\u4f46\u88ab\u8d85\u9ad8\u5e76\u53d1\u8bfb\u53d6（\u6bd4\u5982\u79d2\u6740\u5e93\u5b58\u4e00\u4e2a key \u625b 10 \u4e07 QPS），\u540c\u6837\u62d6\u57ae Redis\u3002\u5927 Key \u6392\u67e5\u8981\u642d\u914d redis-cli –hotkeys（\u9700\u8981\u5f00\u542f maxmemory-policy \u4e3a LFU \u6dd8\u6c70\u7b56\u7565）\u4e00\u8d77\u770b\u3002\u6cbb\u7406\u76ee\u6807\u4e0d\u662f"\u6ca1\u6709\u5927 Key"，\u800c\u662f"\u6ca1\u6709\u53c8\u5927\u53c8\u70ed\u7684 Key"\u3002<\/p>\n

4.3 \u5751\u4e09：\u5927 Key \u8fc7\u671f\u77ac\u95f4\u7684\u5361\u987f\u88ab\u8bef\u5224\u4e3a\u7f51\u7edc\u95ee\u9898<\/h4>\n

\u67d0\u6b21\u7ebf\u4e0a 2 \u79d2\u8d85\u65f6，\u7f51\u7edc\u56e2\u961f\u6392\u67e5\u534a\u5929\u65e0\u679c，\u6700\u540e\u53d1\u73b0\u662f\u4e00\u4e2a\u8bbe\u7f6e\u4e86 24 \u5c0f\u65f6 TTL \u7684\u5927 List \u6bcf\u5230\u51cc\u6668 3 \u70b9\u8fc7\u671f，\u5220\u9664\u52a8\u4f5c\u5361\u4f4f\u4e3b\u7ebf\u7a0b 1.8 \u79d2\u3002\u5927 Key \u5373\u4f7f\u4e0d\u8bfb\u5199，\u8fc7\u671f\u672c\u8eab\u5c31\u662f\u4e8b\u6545\u3002\u6cbb\u7406：\u8981\u4e48\u62c6\u5206\u540e\u8bbe TTL，\u8981\u4e48\u7528 UNLINK \u903b\u8f91\u5220\u9664 + \u5b9a\u65f6\u4efb\u52a1\u515c\u5e95\u6e05\u7406\u3002<\/p>\n

4.4 \u5751\u56db：StringRedisTemplate \u5e8f\u5217\u5316\u5bfc\u81f4\u7684"\u5047\u5927 Key"<\/h4>\n

\u4e1a\u52a1\u7528 RedisTemplate<String, Object> \u914d JDK \u5e8f\u5217\u5316\u65f6，\u4e00\u4e2a\u7b80\u5355\u5bf9\u8c61\u4f1a\u88ab\u5e8f\u5217\u5316\u6210\u51e0\u767e\u5b57\u8282，1000 \u4e2a\u5143\u7d20\u5c31\u8f7b\u677e\u8fc7 1MB\u2014\u2014\u8fd9\u4e0d\u662f\u4e1a\u52a1\u6570\u636e\u5927，\u662f\u5e8f\u5217\u5316\u683c\u5f0f\u5783\u573e\u3002\u6392\u67e5\u5927 Key \u524d\u5148\u786e\u8ba4\u5e8f\u5217\u5316\u65b9\u5f0f，\u751f\u4ea7\u5efa\u8bae\u7edf\u4e00\u7528 StringRedisTemplate + JSON \u5b57\u7b26\u4e32，\u7701\u5185\u5b58\u8fd8\u7701\u5e26\u5bbd\u3002<\/p>\n

4.5 \u6700\u4f73\u5b9e\u8df5\u6e05\u5355<\/h4>\n\n\u63aa\u65bd\u505a\u6cd5\u89e3\u51b3\u4ec0\u4e48\u95ee\u9898<\/tr>\n\n\n\n\n\n\n\n
\u5199\u5165\u7aef\u9650\u5236<\/td>\n\u96c6\u5408\u5199\u5165\u524d\u68c0\u67e5\u5927\u5c0f，\u8d85\u8fc7\u9608\u503c\u81ea\u52a8\u5206\u7247\u6216\u62d2\u7edd<\/td>\n\u4ece\u6e90\u5934\u9632\u6b62\u5927 Key \u4ea7\u751f<\/td>\n<\/tr>\n
\u5b9a\u671f\u626b\u63cf<\/td>\n\u4f4e\u5cf0\u671f\u8dd1 SCAN \u626b\u63cf\u5668，\u7ed3\u679c\u5199\u5165\u76d1\u63a7<\/td>\n\u65e9\u53d1\u73b0\u65e9\u6cbb\u7406<\/td>\n<\/tr>\n
\u76d1\u63a7\u544a\u8b66<\/td>\n\u5bf9 key \u5927\u5c0f\u3001\u6162\u547d\u4ee4\u3001\u4e3b\u4ece\u5ef6\u8fdf\u8bbe\u9608\u503c\u544a\u8b66<\/td>\n\u4e8b\u6545\u524d\u62e6\u622a<\/td>\n<\/tr>\n
\u5220\u9664\u89c4\u8303<\/td>\n\u4e00\u5f8b UNLINK，\u7981\u6b62 DEL \u5927\u96c6\u5408<\/td>\n\u907f\u514d\u5220\u9664\u5361\u987f<\/td>\n<\/tr>\n
\u62c6\u5206\u89c4\u8303<\/td>\n\u6309\u4e1a\u52a1\u7ef4\u5ea6\u62c6\u5206，\u56fa\u5b9a\u5206\u7247\u5927\u5c0f<\/td>\n\u5355 key \u89c4\u6a21\u53ef\u63a7<\/td>\n<\/tr>\n
\u5e8f\u5217\u5316\u89c4\u8303<\/td>\nStringRedisTemplate + JSON<\/td>\n\u6d88\u706d"\u5047\u5927 Key"<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4e94\u3001\u6027\u80fd\u5bf9\u6bd4\u548c\u6280\u672f\u9009\u578b<\/h3>\n

\u6cbb\u7406\u524d\u540e\u6027\u80fd\u5dee\u5f02\u662f\u6570\u91cf\u7ea7\u7684：\u540c\u6837 800 \u4e07\u5143\u7d20\u7684 Hash，HGETALL \u62c9\u5168\u91cf\u8017\u65f6 4.6 \u79d2，\u62c6\u5206\u540e\u5355\u5206\u7247\u8bfb\u53d6 0.3 \u6beb\u79d2；DEL \u5220\u9664\u5361\u4e3b\u7ebf\u7a0b 2.1 \u79d2，UNLINK \u5f02\u6b65\u5220\u9664\u4e3b\u7ebf\u7a0b 0.01 \u6beb\u79d2\u8fd4\u56de\u3002 \u4ee5\u4e0b\u662f\u5b9e\u6d4b\u91cf\u7ea7\u7684\u5bf9\u6bd4（800 \u4e07\u5143\u7d20 Hash，\u5355\u673a Redis 7）：<\/p>\n\n\u64cd\u4f5c\u547d\u4ee4\u8017\u65f6\u91cf\u7ea7\u662f\u5426\u963b\u585e\u4e3b\u7ebf\u7a0b<\/tr>\n\n\n\n\n\n\n\n
\u8bfb\u5168\u91cf<\/td>\nHGETALL<\/td>\n\u79d2\u7ea7 + \u5de8\u91cf\u5e26\u5bbd<\/td>\n\u662f<\/td>\n<\/tr>\n
\u8bfb\u62c6\u5206\u540e\u7684\u5355\u5206\u7247<\/td>\nHGET \/ HGETALL(500\u5b57\u6bb5)<\/td>\n\u4e9a\u6beb\u79d2<\/td>\n\u5426<\/td>\n<\/tr>\n
\u5220\u9664<\/td>\nDEL<\/td>\n\u79d2\u7ea7<\/td>\n\u662f<\/td>\n<\/tr>\n
\u5220\u9664<\/td>\nUNLINK<\/td>\n\u5fae\u79d2\u7ea7\u8fd4\u56de<\/td>\n\u5426（\u540e\u53f0\u7ebf\u7a0b\u91ca\u653e）<\/td>\n<\/tr>\n
\u5168\u5e93\u904d\u5386<\/td>\nKEYS *<\/td>\n\u79d2\u7ea7~\u5206\u949f\u7ea7<\/td>\n\u662f，\u7981\u7528<\/td>\n<\/tr>\n
\u5168\u5e93\u904d\u5386<\/td>\nSCAN<\/td>\n\u6bcf\u8f6e\u6beb\u79d2\u7ea7<\/td>\n\u5426<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u6280\u672f\u9009\u578b\u7684\u6838\u5fc3\u539f\u5219：\u80fd\u62c6\u5219\u62c6，\u4e0d\u80fd\u62c6\u5c31\u5f02\u6b65\u5220，\u7edd\u5bf9\u4e0d\u80fd\u786c\u625b\u3002 \u5224\u65ad\u987a\u5e8f\u5982\u4e0b：<\/p>\n

  • \u8fd9\u4e2a key \u8fd8\u91cd\u8981\u5417？ \u4e0d\u91cd\u8981 \u2192 UNLINK \u5220\u6389，\u6700\u7701\u4e8b\u3002<\/li>\n
  • \u91cd\u8981\u4f46\u80fd\u62c6\u5206\u5417？ \u80fd（\u8d2d\u7269\u8f66\u3001\u6d88\u606f\u961f\u5217\u3001\u7528\u6237\u6807\u7b7e\u8fd9\u7c7b\u5929\u7136\u6709\u4e1a\u52a1\u7ef4\u5ea6）\u2192 \u6309\u4e1a\u52a1\u5b57\u6bb5\u62c6\u5206，\u4e00\u52b3\u6c38\u9038\u3002<\/li>\n
  • \u91cd\u8981\u4e14\u62c6\u4e0d\u4e86？（\u6bd4\u5982\u5355\u4e2a\u8d85\u5927 String \u5b58\u5927 JSON）\u2192 \u6362\u5b58\u50a8：\u628a\u5927\u5bf9\u8c61\u632a\u5230\u5bf9\u8c61\u5b58\u50a8\/MySQL blob，Redis \u53ea\u5b58\u5f15\u7528\u3002\u8fd9\u662f\u6700\u540e\u624b\u6bb5，\u4f46\u6bd4\u786c\u625b\u5f3a\u3002<\/li>\n
  • Redis \u7248\u672c < 4.0？ \u6ca1\u6709 UNLINK，\u5148\u5347\u7ea7 Redis，\u8fd9\u662f\u5f02\u6b65\u5220\u9664\u7684\u524d\u63d0\u3002<\/li>\n

    \u516d\u3001\u603b\u7ed3<\/h3>\n

    \u5927 Key \u7684\u672c\u8d28\u662f"\u5355\u7ebf\u7a0b Redis \u9047\u4e0a O(N) \u64cd\u4f5c"：\u4e00\u4e2a key \u7684\u6570\u636e\u91cf\u5931\u63a7，\u5c31\u80fd\u8ba9\u6574\u4e2a\u5b9e\u4f8b\u7684\u547d\u4ee4\u6392\u961f\u3001\u4e3b\u4ece\u540c\u6b65\u5931\u8d25\u3001\u96c6\u7fa4\u6570\u636e\u503e\u659c\u3002 \u6392\u67e5\u9760 SCAN \u6e38\u6807\u626b\u63cf（\u7981\u6b62 KEYS），\u5b9a\u4f4d\u9760 O(1) \u7684\u5143\u6570\u636e\u547d\u4ee4（HLEN\/LLEN\/SCARD\/ZCARD，\u7981\u6b62 HGETALL），\u6cbb\u7406\u9760\u62c6\u5206\u548c UNLINK \u5f02\u6b65\u5220\u9664，\u9632\u7ebf\u9760\u5199\u5165\u7aef\u9650\u5236 + \u5b9a\u671f\u626b\u63cf + \u76d1\u63a7\u544a\u8b66\u3002<\/p>\n

    \u56de\u987e\u6587\u7ae0\u5f00\u5934\u7684\u6545\u969c：\u90a3\u4e2a 800 \u4e07\u5143\u7d20\u7684\u8d2d\u7269\u8f66 Hash \u6700\u7ec8\u901a\u8fc7"\u5206\u7247\u8fc1\u79fb + UNLINK \u5220\u9664\u8001 key"\u89e3\u51b3，\u4e3b\u4ece\u5207\u6362\u6062\u590d\u6b63\u5e38，\u5355\u63a5\u53e3\u8017\u65f6\u4ece 800ms \u56de\u5230 3ms\u3002\u6574\u4e2a\u8fc7\u7a0b\u6ca1\u6709\u5347\u7ea7\u670d\u52a1\u5668\u3001\u6ca1\u6709\u6539\u67b6\u6784，\u53ea\u662f\u628a"\u4e00\u4e2a\u5de8\u5927\u7684 key"\u53d8\u6210"\u4e00\u7ec4\u53ef\u63a7\u7684\u5c0f key"\u2014\u2014\u8fd9\u5c31\u662f\u5927 Key \u6cbb\u7406\u7684\u5168\u90e8\u4ef7\u503c：\u7528\u6700\u5c0f\u7684\u6539\u52a8，\u6d88\u9664\u6700\u5927\u7684\u9690\u60a3\u3002<\/p>\n

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