{"id":129549,"date":"2024-10-26T22:28:23","date_gmt":"2024-10-26T14:28:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/129549\/"},"modified":"2024-10-26T22:28:24","modified_gmt":"2024-10-26T14:28:24","slug":"redis%e8%b7%b3%e8%a1%a8%e5%af%a6%e7%8f%be%e7%9a%84%e9%9a%a8%e6%a9%9f%e5%87%bd%e6%95%b8%e5%84%aa%e5%8c%96%ef%bc%88redis-%e8%b7%b3%e8%a1%a8%e9%9a%a8%e6%a9%9f%e5%87%bd%e6%95%b8%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/129549\/","title":{"rendered":"Redis\u8df3\u8868\u5be6\u73fe\u7684\u96a8\u6a5f\u51fd\u6578\u512a\u5316\uff08redis \u8df3\u8868\u96a8\u6a5f\u51fd\u6578\uff09"},"content":{"rendered":"<h1 id=\"redis%e8%b7%b3%e8%a1%a8%e5%af%a6%e7%8f%be%e7%9a%84%e9%9a%a8%e6%a9%9f%e5%87%bd%e6%95%b8%e5%84%aa%e5%8c%96%ef%bc%88redis-%e8%b7%b3%e8%a1%a8%e9%9a%a8%e6%a9%9f%e5%87%bd%e6%95%b8%ef%bc%89-neJwXPoZhg\">Redis\u8df3\u8868\u5be6\u73fe\u7684\u96a8\u6a5f\u51fd\u6578\u512a\u5316\uff08redis \u8df3\u8868\u96a8\u6a5f\u51fd\u6578\uff09<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u8655\u7406\u548c\u5b58\u5132\u9818\u57df\uff0cRedis\u4f5c\u70ba\u4e00\u500b\u9ad8\u6548\u7684\u9375\u503c\u6578\u64da\u5eab\uff0c\u56e0\u5176\u5353\u8d8a\u7684\u6027\u80fd\u548c\u9748\u6d3b\u7684\u6578\u64da\u7d50\u69cb\u800c\u53d7\u5230\u5ee3\u6cdb\u95dc\u6ce8\u3002Redis\u7684\u8df3\u8868\uff08Skip List\uff09\u662f\u4e00\u7a2e\u91cd\u8981\u7684\u6578\u64da\u7d50\u69cb\uff0c\u80fd\u5920\u5728O(log n)\u7684\u6642\u9593\u5167\u9032\u884c\u67e5\u627e\u3001\u63d2\u5165\u548c\u522a\u9664\u64cd\u4f5c\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eRedis\u8df3\u8868\u7684\u5be6\u73fe\u53ca\u5176\u96a8\u6a5f\u51fd\u6578\u7684\u512a\u5316\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u4ee3\u78bc\u793a\u4f8b\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e8%b7%b3%e8%a1%a8%ef%bc%9f-neJwXPoZhg\">\u4ec0\u9ebc\u662f\u8df3\u8868\uff1f<\/h2>\n<p>\u8df3\u8868\u662f\u4e00\u7a2e\u57fa\u65bc\u93c8\u8868\u7684\u6578\u64da\u7d50\u69cb\uff0c\u901a\u904e\u591a\u5c64\u93c8\u8868\u4f86\u52a0\u901f\u67e5\u627e\u904e\u7a0b\u3002\u6bcf\u4e00\u5c64\u7684\u93c8\u8868\u90fd\u662f\u4e0a\u4e00\u5c64\u93c8\u8868\u7684\u5b50\u96c6\uff0c\u9019\u6a23\u53ef\u4ee5\u5728\u67e5\u627e\u6642\u8df3\u904e\u591a\u500b\u5143\u7d20\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u627e\u6548\u7387\u3002\u8df3\u8868\u7684\u57fa\u672c\u601d\u60f3\u662f\u96a8\u6a5f\u5316\uff0c\u901a\u904e\u96a8\u6a5f\u9078\u64c7\u5143\u7d20\u4f86\u6c7a\u5b9a\u5176\u5c64\u7d1a\uff0c\u9019\u6a23\u53ef\u4ee5\u4fdd\u6301\u7d50\u69cb\u7684\u5e73\u8861\u3002<\/p>\n<h2 id=\"redis%e4%b8%ad%e7%9a%84%e8%b7%b3%e8%a1%a8%e5%af%a6%e7%8f%be-neJwXPoZhg\">Redis\u4e2d\u7684\u8df3\u8868\u5be6\u73fe<\/h2>\n<p>\u5728Redis\u4e2d\uff0c\u8df3\u8868\u7528\u65bc\u5be6\u73fe\u6709\u5e8f\u96c6\u5408\uff08Sorted Set\uff09\u3002\u6bcf\u500b\u6709\u5e8f\u96c6\u5408\u4e2d\u7684\u5143\u7d20\u90fd\u6709\u4e00\u500b\u5206\u6578\uff08score\uff09\uff0c\u6839\u64da\u5206\u6578\u7684\u5927\u5c0f\u9032\u884c\u6392\u5e8f\u3002Redis\u7684\u8df3\u8868\u7531\u591a\u500b\u5c64\u7d1a\u7d44\u6210\uff0c\u6bcf\u500b\u5c64\u7d1a\u90fd\u662f\u4e00\u500b\u6709\u5e8f\u93c8\u8868\uff0c\u4e26\u4e14\u6bcf\u500b\u5143\u7d20\u90fd\u6709\u4e00\u500b\u96a8\u6a5f\u751f\u6210\u7684\u5c64\u7d1a\u3002<\/p>\n<h3 id=\"%e8%b7%b3%e8%a1%a8%e7%9a%84%e7%b5%90%e6%a7%8b-neJwXPoZhg\">\u8df3\u8868\u7684\u7d50\u69cb<\/h3>\n<pre><code>\ntypedef struct skiplistNode {\n    struct skiplistNode *forward[];\n    int score;\n    char *obj;\n} skiplistNode;\n\ntypedef struct skiplist {\n    int level;\n    skiplistNode *header;\n    skiplistNode *tail;\n    long length;\n} skiplist;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7d50\u69cb\u4e2d\uff0c<code>forward<\/code>\u662f\u4e00\u500b\u6307\u5411\u4e0b\u4e00\u5c64\u7bc0\u9ede\u7684\u6307\u91dd\u6578\u7d44\uff0c<code>score<\/code>\u662f\u7bc0\u9ede\u7684\u5206\u6578\uff0c<code>obj<\/code>\u662f\u7bc0\u9ede\u7684\u503c\u3002<\/p>\n<h3 id=\"%e9%9a%a8%e6%a9%9f%e5%87%bd%e6%95%b8%e7%9a%84%e5%84%aa%e5%8c%96-neJwXPoZhg\">\u96a8\u6a5f\u51fd\u6578\u7684\u512a\u5316<\/h3>\n<p>\u5728Redis\u7684\u8df3\u8868\u4e2d\uff0c\u96a8\u6a5f\u51fd\u6578\u7528\u65bc\u6c7a\u5b9a\u6bcf\u500b\u7bc0\u9ede\u7684\u5c64\u7d1a\u3002\u9019\u500b\u96a8\u6a5f\u5316\u904e\u7a0b\u901a\u5e38\u4f7f\u7528\u4e00\u500b\u7c21\u55ae\u7684\u96a8\u6a5f\u6578\u751f\u6210\u5668\u4f86\u5be6\u73fe\u3002\u70ba\u4e86\u63d0\u9ad8\u6027\u80fd\uff0cRedis\u4f7f\u7528\u4e86\u4e00\u7a2e\u7a31\u70ba\u201c\u4e8c\u9032\u5236\u96a8\u6a5f\u5316\u201d\u7684\u65b9\u6cd5\uff0c\u9019\u7a2e\u65b9\u6cd5\u80fd\u5920\u5728O(log n)\u7684\u6642\u9593\u5167\u751f\u6210\u96a8\u6a5f\u5c64\u7d1a\u3002<\/p>\n<pre><code>\nint randomLevel() {\n    int level = 1;\n    while (rand() % 2 == 0) {\n        level++;\n    }\n    return level &amp; MAX_LEVEL;\n}\n<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u4e2d\uff0c<code>randomLevel<\/code>\u51fd\u6578\u901a\u904e\u96a8\u6a5f\u751f\u62100\u62161\u4f86\u6c7a\u5b9a\u5c64\u7d1a\uff0c\u4e26\u4e14\u4f7f\u7528\u4f4d\u904b\u7b97\u4f86\u9650\u5236\u5c64\u7d1a\u7684\u6700\u5927\u503c\u3002\u9019\u6a23\u7684\u96a8\u6a5f\u5316\u65b9\u6cd5\u80fd\u5920\u6709\u6548\u5730\u4fdd\u6301\u8df3\u8868\u7684\u5e73\u8861\u6027\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u627e\u6548\u7387\u3002<\/p>\n<h2 id=\"%e8%b7%b3%e8%a1%a8%e7%9a%84%e5%84%aa%e5%8b%a2-neJwXPoZhg\">\u8df3\u8868\u7684\u512a\u52e2<\/h2>\n<ul>\n<li><strong>\u9ad8\u6548\u67e5\u627e\uff1a<\/strong>\u8df3\u8868\u80fd\u5920\u5728O(log n)\u7684\u6642\u9593\u5167\u5b8c\u6210\u67e5\u627e\u64cd\u4f5c\uff0c\u9019\u4f7f\u5f97\u5b83\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u8868\u73fe\u51fa\u8272\u3002<\/li>\n<li><strong>\u52d5\u614b\u589e\u9577\uff1a<\/strong>\u8df3\u8868\u53ef\u4ee5\u96a8\u8457\u6578\u64da\u7684\u589e\u9577\u800c\u52d5\u614b\u8abf\u6574\u7d50\u69cb\uff0c\u7121\u9700\u50cf\u5e73\u8861\u6a39\u90a3\u6a23\u9032\u884c\u8907\u96dc\u7684\u91cd\u69cb\u3002<\/li>\n<li><strong>\u7c21\u55ae\u5be6\u73fe\uff1a<\/strong>\u76f8\u8f03\u65bc\u5176\u4ed6\u6578\u64da\u7d50\u69cb\uff0c\u8df3\u8868\u7684\u5be6\u73fe\u76f8\u5c0d\u7c21\u55ae\uff0c\u6613\u65bc\u7406\u89e3\u548c\u7dad\u8b77\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-neJwXPoZhg\">\u7d50\u8ad6<\/h2>\n<p>Redis\u7684\u8df3\u8868\u5be6\u73fe\u5229\u7528\u96a8\u6a5f\u51fd\u6578\u9032\u884c\u512a\u5316\uff0c\u63d0\u4f9b\u4e86\u4e00\u7a2e\u9ad8\u6548\u4e14\u9748\u6d3b\u7684\u6578\u64da\u5b58\u5132\u89e3\u6c7a\u65b9\u6848\u3002\u901a\u904e\u96a8\u6a5f\u5316\u5c64\u7d1a\u7684\u751f\u6210\uff0c\u8df3\u8868\u80fd\u5920\u4fdd\u6301\u826f\u597d\u7684\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6709\u5e8f\u6578\u64da\u6642\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u67e5\u627e\u548c\u52d5\u614b\u589e\u9577\u7684\u61c9\u7528\u5834\u666f\uff0cRedis\u7684\u8df3\u8868\u7121\u7591\u662f\u4e00\u500b\u7406\u60f3\u7684\u9078\u64c7\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u95dc\u65bc\u9ad8\u6548\u6578\u64da\u5b58\u5132\u548c\u8655\u7406\u7684\u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9 <a href=\"https:\/\/server.hk\">Server.HK<\/a>\uff0c\u63a2\u7d22\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u670d\u52d9\u53ca\u5176\u4ed6\u7522\u54c1\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Redis\u8df3\u8868\u4e2d\u96a8\u6a5f\u51fd\u6578\u7684\u512a\u5316\u6280\u8853\uff0c\u63d0\u5347\u6578\u64da\u7d50\u69cb\u6027\u80fd\u8207\u67e5\u8a62\u6548\u7387\uff0c\u5be6\u73fe\u9ad8\u6548\u7684\u6578\u64da\u5b58\u53d6\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-129549","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/129549","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=129549"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/129549\/revisions"}],"predecessor-version":[{"id":129550,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/129549\/revisions\/129550"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=129549"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=129549"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=129549"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}