{"id":201493,"date":"2025-05-10T08:27:31","date_gmt":"2025-05-10T00:27:31","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201493\/"},"modified":"2025-05-10T08:27:31","modified_gmt":"2025-05-10T00:27:31","slug":"redis%e4%b8%ba%e4%bd%95%e8%bf%99%e4%b9%88%e5%bf%ab-%e6%95%b0%e6%8d%ae%e5%ad%98%e5%82%a8%e8%a7%92%e5%ba%a6","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201493\/","title":{"rendered":"Redis\u4e3a\u4f55\u8fd9\u4e48\u5feb\u2014\u2014\u6570\u636e\u5b58\u50a8\u89d2\u5ea6"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>Redis\u4e3a\u4f55\u8fd9\u4e48\u5feb\u2014\u2014\u6570\u636e\u5b58\u50a8\u89d2\u5ea6<\/h1>\n<p><span style=\"cursor: pointer\"><i><\/i>\u6536\u85cf<\/span> 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<\/p>\n<p><strong>\u7b80\u5355\u52a8\u6001\u5b57\u7b26\u4e32\uff08SDS\uff09<\/strong>\uff0c\u8fd9\u79cd\u7ed3\u6784\u66f4\u50cfC++\u7684String\u6216\u8005Java\u7684ArrayList \uff0c\u957f\u5ea6\u52a8\u6001\u53ef\u53d8\uff1a&nbsp; <\/p>\n<\/p>\n<ol>\n<li><span><span>struct&nbsp;sdshdr&nbsp;{&nbsp;<\/span><\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;buf&nbsp;\u4e2d\u5df2\u5360\u7528\u7a7a\u95f4\u7684\u957f\u5ea6&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;int&nbsp;len;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;buf&nbsp;\u4e2d\u5269\u4f59\u53ef\u7528\u7a7a\u95f4\u7684\u957f\u5ea6&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;int&nbsp;free;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u6570\u636e\u7a7a\u95f4&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;char&nbsp;buf[];&nbsp;\/\/&nbsp;\u2019\u2019\u7a7a\u5b57\u7b26\u7ed3\u5c3e&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>};&nbsp;<\/span><\/li>\n<\/ol>\n<ul>\n<li>&nbsp;get\uff1asdsrange&#8212;O(n)<\/li>\n<li>&nbsp;set\uff1asdscpy\u2014O(n)<\/li>\n<li>&nbsp;create\uff1asdsnew&#8212;O(1)<\/li>\n<li>&nbsp;len\uff1asdslen&#8212;O(1)<\/li>\n<\/ul>\n<p><strong>\u5e38\u6570\u590d\u6742\u5ea6\u83b7\u53d6\u5b57\u7b26\u4e32\u957f\u5ea6\uff1a<\/strong>\u56e0\u4e3aSDS\u5728len\u5c5e\u6027\u4e2d\u8bb0\u5f55\u4e86\u957f\u5ea6\uff0c\u6240\u4ee5\u83b7\u53d6\u4e00\u4e2aSDS\u957f\u5ea6\u65f6\u95f4\u590d\u6742\u5ea6\u4ec5\u4e3aO(1)\u3002<\/p>\n<p><strong>\u9884\u7a7a\u95f4\u5206\u914d\uff1a<\/strong>\u5982\u679c\u5bf9\u4e00\u4e2aSDS\u8fdb\u884c\u4fee\u6539\uff0c\u5206\u4e3a\u4e00\u4e0b\u4e24\u79cd\u60c5\u51b5\uff1a<\/p>\n<ul>\n<li>&nbsp;SDS\u957f\u5ea6\uff08len\u7684\u503c\uff09\u5c0f\u4e8e1MB\uff0c\u90a3\u4e48\u7a0b\u5e8f\u5c06\u5206\u914d\u548clen\u5c5e\u6027\u540c\u6837\u5927\u5c0f\u7684\u672a\u4f7f\u7528\u7a7a\u95f4\uff0c\u8fd9\u65f6free\u548clen\u5c5e\u6027\u503c\u76f8\u540c\u3002\u4e3e\u4e2a\u4f8b\u5b50\uff0cSDS\u7684len\u5c06\u53d8\u621015\u5b57\u8282\uff0c\u5219\u7a0b\u5e8f\u4e5f\u4f1a\u5206\u914d15\u5b57\u8282\u7684\u672a\u4f7f\u7528\u7a7a\u95f4\uff0cSDS\u7684buf\u6570\u7ec4\u7684\u5b9e\u9645\u957f\u5ea6\u53d8\u621015+15+1=31\u5b57\u8282\uff08\u989d\u5916\u4e00\u4e2a\u5b57\u8282\u7528\u6237\u4fdd\u5b58\u7a7a\u5b57\u7b26\uff09\u3002<\/li>\n<li>&nbsp;SDS\u957f\u5ea6\uff08len\u7684\u503c\uff09\u5927\u4e8e\u7b49\u4e8e1MB\uff0c\u7a0b\u5e8f\u4f1a\u5206\u914d1MB\u7684\u672a\u4f7f\u7528\u7a7a\u95f4\u3002\u6bd4\u5982\u8fdb\u884c\u4fee\u6539\u4e4b\u540e\uff0cSDS\u7684len\u53d8\u621030MB\uff0c\u90a3\u4e48\u5b83\u7684\u5b9e\u9645\u957f\u5ea6\u662f30MB+1MB+1byte\u3002<\/li>\n<\/ul>\n<p><strong>\u60f0\u6027\u91ca\u653e\u7a7a\u95f4\uff1a<\/strong>\u5f53\u6267\u884csdstrim\uff08\u622a\u53d6\u5b57\u7b26\u4e32\uff09\u4e4b\u540e\uff0cSDS\u4e0d\u4f1a\u7acb\u9a6c\u91ca\u653e\u591a\u51fa\u6765\u7684\u7a7a\u95f4\uff0c\u5982\u679c\u4e0b\u6b21\u518d\u8fdb\u884c\u62fc\u63a5\u5b57\u7b26\u4e32\u64cd\u4f5c\uff0c\u4e14\u62fc\u63a5\u7684\u6ca1\u6709\u521a\u624d\u91ca\u653e\u7684\u7a7a\u95f4\u5927\uff0c\u5219\u90a3\u4e9b\u672a\u4f7f\u7528\u7684\u7a7a\u95f4\u5c31\u4f1a\u6392\u4e0a\u7528\u573a\u3002<strong>\u901a\u8fc7<\/strong><strong>\u60f0\u6027\u91ca\u653e\u7a7a\u95f4\u907f\u514d\u4e86\u7279\u5b9a\u60c5\u51b5\u4e0b\u64cd\u4f5c\u5b57\u7b26\u4e32\u7684\u5185\u5b58\u91cd\u65b0\u5206\u914d\u64cd\u4f5c\u3002<\/strong><\/p>\n<p><strong>\u675c\u7edd\u7f13\u51b2\u533a\u6ea2\u51fa\uff1a<\/strong>\u4f7f\u7528C\u5b57\u7b26\u4e32\u7684\u64cd\u4f5c\u65f6\uff0c\u5982\u679c\u5b57\u7b26\u4e32\u957f\u5ea6\u589e\u52a0\uff08\u5982strcat\u64cd\u4f5c\uff09\u800c\u5fd8\u8bb0\u91cd\u65b0\u5206\u914d\u5185\u5b58\uff0c\u5f88\u5bb9\u6613\u9020\u6210\u7f13\u51b2\u533a\u7684\u6ea2\u51fa\uff1b\u800cSDS\u7531\u4e8e\u8bb0\u5f55\u4e86\u957f\u5ea6\uff0c\u76f8\u5e94\u7684\u64cd\u4f5c\u5728\u53ef\u80fd\u9020\u6210\u7f13\u51b2\u533a\u6ea2\u51fa\u65f6\u4f1a\u81ea\u52a8\u91cd\u65b0\u5206\u914d\u5185\u5b58\uff0c\u675c\u7edd\u4e86\u7f13\u51b2\u533a\u6ea2\u51fa\u3002<\/p>\n<p><strong>\u56db\u3001List<\/strong><\/p>\n<p>List\u5bf9\u8c61\u7684\u5e95\u5c42\u5b9e\u73b0\u662fquicklist\uff08\u5feb\u901f\u5217\u8868\uff0c\u662fziplist \u538b\u7f29\u5217\u8868 \u548clinkedlist \u53cc\u7aef\u94fe\u8868 \u7684\u7ec4\u5408\uff09\u3002Redis\u4e2d\u7684\u5217\u8868\u652f\u6301\u4e24\u7aef\u63d2\u5165\u548c\u5f39\u51fa\uff0c\u5e76\u53ef\u4ee5\u83b7\u5f97\u6307\u5b9a\u4f4d\u7f6e\uff08\u6216\u8303\u56f4\uff09\u7684\u5143\u7d20\uff0c\u53ef\u4ee5\u5145\u5f53\u6570\u7ec4\u3001\u961f\u5217\u3001\u6808\u7b49\u3002&nbsp;<\/p>\n<\/p>\n<ol>\n<li><span><span>typedef&nbsp;struct&nbsp;listNode&nbsp;{&nbsp;<\/span><\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u524d\u7f6e\u8282\u70b9&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;struct&nbsp;listNode&nbsp;*prev;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u540e\u7f6e\u8282\u70b9&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;struct&nbsp;listNode&nbsp;*next;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u8282\u70b9\u7684\u503c&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;void&nbsp;*value;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;}&nbsp;listNode;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;typedef&nbsp;struct&nbsp;list&nbsp;{&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u8868\u5934\u8282\u70b9&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;listNode&nbsp;*head;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u8868\u5c3e\u8282\u70b9&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;listNode&nbsp;*tail;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u8282\u70b9\u503c\u590d\u5236\u51fd\u6570&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;void&nbsp;*(*dup)(void&nbsp;*ptr);&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u8282\u70b9\u503c\u91ca\u653e\u51fd\u6570&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;void&nbsp;(*free)(void&nbsp;*ptr);&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u8282\u70b9\u503c\u5bf9\u6bd4\u51fd\u6570&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;int&nbsp;(*match)(void&nbsp;*ptr,&nbsp;void&nbsp;*key);&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u94fe\u8868\u6240\u5305\u542b\u7684\u8282\u70b9\u6570\u91cf&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;unsigned&nbsp;long&nbsp;len;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;}&nbsp;list;&nbsp;<\/span><\/li>\n<\/ol>\n<ul>\n<li>&nbsp;rpush: listAddNodeHead &#8212;O(1)<\/li>\n<li>&nbsp;lpush: listAddNodeTail &#8212;O(1)<\/li>\n<li>&nbsp;push:listInsertNode &#8212;O(1)<\/li>\n<li>&nbsp;index : listIndex &#8212;O(N)<\/li>\n<li>&nbsp;pop:ListFirst\/listLast &#8212;O(1)<\/li>\n<li>&nbsp;llen:listLength &#8212;O(N)<\/li>\n<\/ul>\n<p><strong>4.1 linkedlist\uff08\u53cc\u7aef\u94fe\u8868\uff09<\/strong><\/p>\n<p>\u6b64\u7ed3\u6784\u6bd4\u8f83\u50cfJava\u7684LinkedList\uff0c\u6709\u5174\u8da3\u53ef\u4ee5\u9605\u8bfb\u4e00\u4e0b\u6e90\u7801\u3002<\/p>\n<\/p>\n<p> &nbsp; <\/p>\n<p>\u4ece\u56fe\u4e2d\u53ef\u4ee5\u770b\u51faRedis\u7684linkedlist\u53cc\u7aef\u94fe\u8868\u6709\u4ee5\u4e0b\u7279\u6027\uff1a\u8282\u70b9\u5e26\u6709prev\u3001next\u6307\u9488\u3001head\u6307\u9488\u548ctail\u6307\u9488\uff0c<strong>\u83b7\u53d6\u524d\u7f6e\u8282\u70b9\u3001\u540e\u7f6e\u8282\u70b9\u3001\u8868\u5934\u8282\u70b9\u548c\u8868\u5c3e\u8282\u70b9\u7684\u590d\u6742\u5ea6\u90fd\u662fO\uff081\uff09\u3002len\u5c5e\u6027\u83b7\u53d6\u8282<\/strong><strong>\u70b9\u6570<\/strong><strong>\u91cf\u4e5f\u4e3aO\uff081\uff09\u3002<\/strong><\/p>\n<p>\u4e0e\u53cc\u7aef\u94fe\u8868\u76f8\u6bd4\uff0c\u538b\u7f29\u5217\u8868\u53ef\u4ee5\u8282\u7701\u5185\u5b58\u7a7a\u95f4\uff0c\u4f46\u662f\u8fdb\u884c\u4fee\u6539\u6216\u589e\u5220\u64cd\u4f5c\u65f6\uff0c\u590d\u6742\u5ea6\u8f83\u9ad8\uff1b\u56e0\u6b64\u5f53\u8282\u70b9\u6570\u91cf\u8f83\u5c11\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u538b\u7f29\u5217\u8868\uff1b\u4f46\u662f\u8282\u70b9\u6570\u91cf\u591a\u65f6\uff0c\u8fd8\u662f\u4f7f\u7528\u53cc\u7aef\u94fe\u8868\u5212\u7b97\u3002<\/p>\n<p><strong>4.2 ziplist\uff08\u538b\u7f29\u5217\u8868\uff09<\/strong><\/p>\n<p>\u5f53\u4e00\u4e2a\u5217\u8868\u952e\u53ea\u5305\u542b\u5c11\u91cf\u5217\u8868\u9879\uff0c\u4e14\u662f\u5c0f\u6574\u6570\u503c\u6216\u957f\u5ea6\u6bd4\u8f83\u77ed\u7684\u5b57\u7b26\u4e32\u65f6\uff0c\u90a3\u4e48redis\u5c31\u4f7f\u7528ziplist\uff08\u538b\u7f29\u5217\u8868\uff09\u6765\u505a\u5217\u8868\u952e\u7684\u5e95\u5c42\u5b9e\u73b0\u3002<\/p>\n<\/p>\n<p><strong>ziplist\u662fRedis\u4e3a\u4e86\u8282\u7ea6\u5185\u5b58\u800c\u5f00\u53d1\u7684<\/strong>\uff0c\u662f\u7531\u4e00\u7cfb\u5217\u7279\u6b8a\u7f16\u7801\u7684\u8fde\u7eed\u5185\u5b58\u5757(\u800c\u4e0d\u662f\u50cf\u53cc\u7aef\u94fe\u8868\u4e00\u6837\u6bcf\u4e2a\u8282\u70b9\u662f\u6307\u9488)\u7ec4\u6210\u7684\u987a\u5e8f\u578b\u6570\u636e\u7ed3\u6784\uff1b\u5177\u4f53\u7ed3\u6784\u76f8\u5bf9\u6bd4\u8f83\u590d\u6742\uff0c\u6709\u5174\u8da3\u8bfb\u8005\u53ef\u4ee5\u770b Redis \u54c8\u5e0c\u7ed3\u6784\u5185\u5b58\u6a21\u578b\u5256\u6790\u3002\u5728\u65b0\u7248\u672c\u4e2d<strong>list\u94fe\u8868\u4f7f\u7528 quicklist \u4ee3\u66ff\u4e86 ziplist\u548c linkedlist\uff1a<\/strong><\/p>\n<\/p>\n<p>quickList \u662f zipList \u548c linkedList \u7684\u6df7\u5408\u4f53\u3002\u5b83\u5c06 linkedList \u6309\u6bb5\u5207\u5206\uff0c\u6bcf\u4e00\u6bb5\u4f7f\u7528 zipList \u6765\u7d27\u51d1\u5b58\u50a8\uff0c\u591a\u4e2a zipList \u4e4b\u95f4\u4f7f\u7528\u53cc\u5411\u6307\u9488\u4e32\u63a5\u8d77\u6765\u3002\u56e0\u4e3a\u94fe\u8868\u7684\u9644\u52a0\u7a7a\u95f4\u76f8\u5bf9\u592a\u9ad8\uff0cprev \u548c next \u6307\u9488\u5c31\u8981\u5360\u53bb 16 \u4e2a\u5b57\u8282 (64bit \u7cfb\u7edf\u7684\u6307\u9488\u662f 8 \u4e2a\u5b57\u8282)\uff0c\u53e6\u5916\u6bcf\u4e2a\u8282\u70b9\u7684\u5185\u5b58\u90fd\u662f\u5355\u72ec\u5206\u914d\uff0c\u4f1a\u52a0\u5267\u5185\u5b58\u7684\u788e\u7247\u5316\uff0c\u5f71\u54cd\u5185\u5b58\u7ba1\u7406\u6548\u7387\u3002<\/p>\n<\/p>\n<p>quicklist \u9ed8\u8ba4\u7684\u538b\u7f29\u6df1\u5ea6\u662f 0\uff0c\u4e5f\u5c31\u662f\u4e0d\u538b\u7f29\u3002\u4e3a\u4e86\u652f\u6301\u5feb\u901f\u7684 push\/pop \u64cd\u4f5c\uff0cquicklist \u7684\u9996\u5c3e\u4e24\u4e2a ziplist \u4e0d\u538b\u7f29\uff0c\u6b64\u65f6\u6df1\u5ea6\u5c31\u662f 1\u3002\u4e3a\u4e86\u8fdb\u4e00\u6b65\u8282\u7ea6\u7a7a\u95f4\uff0cRedis \u8fd8\u4f1a\u5bf9 ziplist \u8fdb\u884c\u538b\u7f29\u5b58\u50a8\uff0c\u4f7f\u7528 LZF \u7b97\u6cd5\u538b\u7f29\u3002<\/p>\n<p><strong>\u4e94\u3001Hash<\/strong><\/p>\n<p>Hash\u5bf9\u8c61\u7684\u5e95\u5c42\u5b9e\u73b0\u53ef\u4ee5\u662fziplist\uff08\u538b\u7f29\u5217\u8868\uff09\u6216\u8005hashtable\uff08\u5b57\u5178\u6216\u8005\u4e5f\u53eb\u54c8\u5e0c\u8868\uff09\u3002<\/p>\n<\/p>\n<p>Hash\u5bf9\u8c61\u53ea\u6709\u540c\u65f6\u6ee1\u8db3\u4e0b\u9762\u4e24\u4e2a\u6761\u4ef6\u65f6\uff0c\u624d\u4f1a\u4f7f\u7528ziplist\uff08\u538b\u7f29\u5217\u8868\uff09\uff1a1.\u54c8\u5e0c\u4e2d\u5143\u7d20\u6570\u91cf\u5c0f\u4e8e512\u4e2a\uff1b2.\u54c8\u5e0c\u4e2d\u6240\u6709\u952e\u503c\u5bf9\u7684\u952e\u548c\u503c\u5b57\u7b26\u4e32\u957f\u5ea6\u90fd\u5c0f\u4e8e64\u5b57\u8282\u3002<\/p>\n<p><strong>hashtable\u54c8\u5e0c\u8868\u53ef\u4ee5\u5b9e\u73b0O(1)\u590d\u6742\u5ea6\u7684\u8bfb\u5199\u64cd\u4f5c\uff0c\u56e0\u6b64\u6548\u7387\u5f88\u9ad8\u3002<\/strong>\u6e90\u7801\u5982\u4e0b\uff1a&nbsp;<\/p>\n<\/p>\n<ol>\n<li><span><span>typedef&nbsp;struct&nbsp;dict&nbsp;{&nbsp;<\/span><\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u7c7b\u578b\u7279\u5b9a\u51fd\u6570&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;dictType&nbsp;*type;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u79c1\u6709\u6570\u636e&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;void&nbsp;*privdata;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u54c8\u5e0c\u8868&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;dictht&nbsp;ht[2];&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;rehash&nbsp;\u7d22\u5f15&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u5f53&nbsp;rehash&nbsp;\u4e0d\u5728\u8fdb\u884c\u65f6\uff0c\u503c\u4e3a&nbsp;-1&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;int&nbsp;rehashidx;&nbsp;\/*&nbsp;rehashing&nbsp;not&nbsp;in&nbsp;progress&nbsp;if&nbsp;<span>rehashidx<\/span><span>&nbsp;==&nbsp;-1&nbsp;*\/&nbsp;<\/span><\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u76ee\u524d\u6b63\u5728\u8fd0\u884c\u7684\u5b89\u5168\u8fed\u4ee3\u5668\u7684\u6570\u91cf&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;int&nbsp;iterators;&nbsp;\/*&nbsp;number&nbsp;of&nbsp;iterators&nbsp;currently&nbsp;running&nbsp;*\/&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;}&nbsp;dict;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;typedef&nbsp;struct&nbsp;dictht&nbsp;{&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u54c8\u5e0c\u8868\u6570\u7ec4&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;dictEntry&nbsp;**table;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u54c8\u5e0c\u8868\u5927\u5c0f&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;unsigned&nbsp;long&nbsp;size;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u54c8\u5e0c\u8868\u5927\u5c0f\u63a9\u7801\uff0c\u7528\u4e8e\u8ba1\u7b97\u7d22\u5f15\u503c&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u603b\u662f\u7b49\u4e8e&nbsp;size&nbsp;&#8211;&nbsp;1&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;unsigned&nbsp;long&nbsp;sizemask;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u8be5\u54c8\u5e0c\u8868\u5df2\u6709\u8282\u70b9\u7684\u6570\u91cf&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;unsigned&nbsp;long&nbsp;used;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>}&nbsp;dictht;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>typedef&nbsp;struct&nbsp;dictEntry&nbsp;{&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;void&nbsp;*key;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;union&nbsp;{void&nbsp;*val;uint64_t&nbsp;u64;int64_t&nbsp;s64;}&nbsp;v;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u6307\u5411\u4e0b\u4e2a\u54c8\u5e0c\u8868\u8282\u70b9\uff0c\u5f62\u6210\u94fe\u8868&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;struct&nbsp;dictEntry&nbsp;*next;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;}&nbsp;dictEntry;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;typedef&nbsp;struct&nbsp;dictType&nbsp;{&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u8ba1\u7b97\u54c8\u5e0c\u503c\u7684\u51fd\u6570&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;unsigned&nbsp;int&nbsp;(*hashFunction)(const&nbsp;void&nbsp;*key);&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u590d\u5236\u952e\u7684\u51fd\u6570&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;void&nbsp;*(*keyDup)(void&nbsp;*privdata,&nbsp;const&nbsp;void&nbsp;*key);&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u590d\u5236\u503c\u7684\u51fd\u6570&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;void&nbsp;*(*valDup)(void&nbsp;*privdata,&nbsp;const&nbsp;void&nbsp;*obj);&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u5bf9\u6bd4\u952e\u7684\u51fd\u6570&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;int&nbsp;(*keyCompare)(void&nbsp;*privdata,&nbsp;const&nbsp;void&nbsp;*key1,&nbsp;const&nbsp;void&nbsp;*key2);&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u9500\u6bc1\u952e\u7684\u51fd\u6570&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;void&nbsp;(*keyDestructor)(void&nbsp;*privdata,&nbsp;void&nbsp;*key);&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u9500\u6bc1\u503c\u7684\u51fd\u6570&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;void&nbsp;(*valDestructor)(void&nbsp;*privdata,&nbsp;void&nbsp;*obj);&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>}&nbsp;dictType;&nbsp;<\/span><\/li>\n<\/ol>\n<p>\u4e0a\u9762\u6e90\u7801\u53ef\u4ee5\u7b80\u5316\u6210\u5982\u4e0b\u7ed3\u6784\uff1a<\/p>\n<\/p>\n<p>\u8fd9\u4e2a\u7ed3\u6784\u7c7b\u4f3c\u4e8eJDK7\u4ee5\u524d\u7684HashMap \uff0c\u5f53\u6709\u4e24\u4e2a\u6216\u4ee5\u4e0a\u7684\u952e\u88ab\u5206\u914d\u5230\u54c8\u5e0c\u6570\u7ec4\u7684\u540c\u4e00\u4e2a\u7d22\u5f15\u4e0a\u65f6\uff0c\u4f1a\u4ea7\u751f\u54c8\u5e0c\u51b2\u7a81\u3002 <strong>Redis\u4e5f\u4f7f\u7528\u94fe\u5730\u5740\u6cd5\u6765\u89e3\u51b3\u952e\u51b2\u7a81\u3002<\/strong>\u5373\u6bcf\u4e2a\u54c8\u5e0c\u8868\u8282\u70b9\u90fd\u6709\u4e00\u4e2anext\u6307\u9488\uff0c\u591a\u4e2a\u54c8\u5e0c\u8868\u8282\u70b9\u7528next\u6307\u9488\u6784\u6210\u4e00\u4e2a\u5355\u9879\u94fe\u8868\uff0c\u94fe\u5730\u5740\u6cd5\u5c31\u662f\u5c06\u76f8\u540chash\u503c\u7684\u5bf9\u8c61\u7ec4\u7ec7\u6210\u4e00\u4e2a\u94fe\u8868\u653e\u5728hash\u503c\u5bf9\u5e94\u7684\u69fd\u4f4d\u3002 <\/p>\n<p>Redis\u4e2d\u7684\u5b57\u5178\u4f7f\u7528hashtable\u4f5c\u4e3a\u5e95\u5c42\u5b9e\u73b0\u7684\u8bdd\uff0c\u6bcf\u4e2a\u5b57\u5178\u4f1a\u5e26\u6709\u4e24\u4e2a\u54c8\u5e0c\u8868\uff0c\u4e00\u4e2a\u5e73\u65f6\u4f7f\u7528\uff0c\u53e6\u4e00\u4e2a\u4ec5\u5728rehash\uff08\u91cd\u65b0\u6563\u5217\uff09\u65f6\u4f7f\u7528\u3002\u968f\u7740\u5bf9\u54c8\u5e0c\u8868\u7684\u64cd\u4f5c\uff0c\u952e\u4f1a\u9010\u6e10\u589e\u591a\u6216\u51cf\u5c11\u3002\u4e3a\u4e86\u8ba9\u54c8\u5e0c\u8868\u7684\u8d1f\u8f7d\u56e0\u5b50\u7ef4\u6301\u5728\u4e00\u4e2a\u5408\u7406\u8303\u56f4\u5185\uff0cRedis\u4f1a\u5bf9\u54c8\u5e0c\u8868\u7684\u5927\u5c0f\u8fdb\u884c\u6269\u5c55\u6216\u6536\u7f29\uff08rehash\uff09\uff0c<strong>\u4e5f\u5c31\u662f\u5c06ht\u30100\u3011\u91cc\u9762\u6240\u6709\u7684\u952e\u503c\u5bf9\u5206\u591a\u6b21\u3001\u6e10\u8fdb\u5f0f\u7684rehash\u5230ht\u30101\u3011\u91cc\u3002<\/strong><\/p>\n<p><strong>\u516d\u3001Set<\/strong><\/p>\n<p>Set\u96c6\u5408\u5bf9\u8c61\u7684\u5e95\u5c42\u5b9e\u73b0\u53ef\u4ee5\u662fintset\uff08\u6574\u6570\u96c6\u5408\uff09\u6216\u8005hashtable\uff08\u5b57\u5178\u6216\u8005\u4e5f\u53eb\u54c8\u5e0c\u8868\uff09\u3002<\/p>\n<\/p>\n<p>intset\uff08\u6574\u6570\u96c6\u5408\uff09\u5f53\u4e00\u4e2a\u96c6\u5408\u53ea\u542b\u6709\u6574\u6570\uff0c\u5e76\u4e14\u5143\u7d20\u4e0d\u591a\u65f6\u4f1a\u4f7f\u7528intset\uff08\u6574\u6570\u96c6\u5408\uff09\u4f5c\u4e3aSet\u96c6\u5408\u5bf9\u8c61\u7684\u5e95\u5c42\u5b9e\u73b0\u3002&nbsp;<\/p>\n<\/p>\n<ol>\n<li><span><span>typedef&nbsp;struct&nbsp;intset&nbsp;{&nbsp;<\/span><\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u7f16\u7801\u65b9\u5f0f&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;uint32_t&nbsp;encoding;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u96c6\u5408\u5305\u542b\u7684\u5143\u7d20\u6570\u91cf&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;uint32_t&nbsp;length;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u4fdd\u5b58\u5143\u7d20\u7684\u6570\u7ec4&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;int8_t&nbsp;contents[];&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>}&nbsp;intset;&nbsp;<\/span><\/li>\n<\/ol>\n<ul>\n<li>&nbsp;sadd:intsetAdd&#8212;O(1)<\/li>\n<li>&nbsp;smembers:intsetGetO(1)&#8212;O(N)<\/li>\n<li>&nbsp;srem:intsetRemove&#8212;O(N)<\/li>\n<li>&nbsp;slen:intsetlen &#8212;O(1)<\/li>\n<\/ul>\n<p><strong>intset\u5e95\u5c42\u5b9e\u73b0\u4e3a\u6709\u5e8f\uff0c\u65e0\u91cd\u590d\u6570\u7ec4\u4fdd\u5b58\u96c6\u5408\u5143\u7d20<\/strong>\u3002 intset\u8fd9\u4e2a\u7ed3\u6784\u91cc\u7684\u6574\u6570\u6570\u7ec4\u7684\u7c7b\u578b\u53ef\u4ee5\u662f16\u4f4d\u7684\uff0c32\u4f4d\u7684\uff0c64\u4f4d\u7684\u3002\u5982\u679c\u6570\u7ec4\u91cc\u6240\u6709\u7684\u6574\u6570\u90fd\u662f16\u4f4d\u957f\u5ea6\u7684\uff0c\u5982\u679c\u65b0\u52a0\u5165\u4e00\u4e2a32\u4f4d\u7684\u6574\u6570\uff0c\u90a3\u4e48\u6574\u4e2a16\u7684\u6570\u7ec4\u5c06\u5347\u7ea7\u6210\u4e00\u4e2a32\u4f4d\u7684\u6570\u7ec4\u3002<strong>\u5347\u7ea7\u53ef\u4ee5\u63d0\u5347intset\u7684\u7075\u6d3b\u6027\uff0c\u53c8\u53ef\u4ee5\u8282\u7ea6\u5185\u5b58\uff0c<\/strong>\u4f46\u4e0d\u53ef\u9006\u3002<\/p>\n<p><strong>7.ZSet<\/strong><\/p>\n<p>ZSet\u6709\u5e8f\u96c6\u5408\u5bf9\u8c61\u5e95\u5c42\u5b9e\u73b0\u53ef\u4ee5\u662fziplist\uff08\u538b\u7f29\u5217\u8868\uff09\u6216\u8005skiplist\uff08\u8df3\u8dc3\u8868\uff09\u3002<\/p>\n<\/p>\n<p>\u5f53\u4e00\u4e2a\u6709\u5e8f\u96c6\u5408\u7684\u5143\u7d20\u6570\u91cf\u6bd4\u8f83\u591a\u6216\u8005\u6210\u5458\u662f\u6bd4\u8f83\u957f\u7684\u5b57\u7b26\u4e32\u65f6\uff0cRedis\u5c31\u4f7f\u7528skiplist\uff08\u8df3\u8dc3\u8868\uff09\u4f5c\u4e3aZSet\u5bf9\u8c61\u7684\u5e95\u5c42\u5b9e\u73b0\u3002&nbsp;<\/p>\n<\/p>\n<ol>\n<li><span><span>typedef&nbsp;struct&nbsp;zskiplist&nbsp;{&nbsp;<\/span><\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u8868\u5934\u8282\u70b9\u548c\u8868\u5c3e\u8282\u70b9&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;struct&nbsp;zskiplistNode&nbsp;*header,&nbsp;*tail;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u8868\u4e2d\u8282\u70b9\u7684\u6570\u91cf&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;unsigned&nbsp;long&nbsp;length;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u8868\u4e2d\u5c42\u6570***\u7684\u8282\u70b9\u7684\u5c42\u6570&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;int&nbsp;level;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;}&nbsp;zskiplist;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>typedef&nbsp;struct&nbsp;zskiplistNode&nbsp;{&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u6210\u5458\u5bf9\u8c61&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;robj&nbsp;*obj;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u5206\u503c&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;double&nbsp;score;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u540e\u9000\u6307\u9488&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;struct&nbsp;zskiplistNode&nbsp;*backward;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u5c42&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;struct&nbsp;zskiplistLevel&nbsp;{&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u524d\u8fdb\u6307\u9488&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;struct&nbsp;zskiplistNode&nbsp;*forward;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;\/\/&nbsp;\u8de8\u5ea6&#8212;\u524d\u8fdb\u6307\u9488\u6240\u6307\u5411\u8282\u70b9\u4e0e\u5f53\u524d\u8282\u70b9\u7684\u8ddd\u79bb&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;unsigned&nbsp;int&nbsp;span;&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>&nbsp;}&nbsp;level[];&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n<li><span>}&nbsp;zskiplistNode;&nbsp;<\/span><\/li>\n<\/ol>\n<p>zadd&#8212;zslinsert&#8212;\u5e73\u5747O(logN), \u6700\u574fO(N)<\/p>\n<p>zrem&#8212;zsldelete&#8212;\u5e73\u5747O(logN), \u6700\u574fO(N)<\/p>\n<p>zrank&#8211;zslGetRank&#8212;\u5e73\u5747O(logN), \u6700\u574fO(N)<\/p>\n<\/p>\n<p>skiplist\u7684\u67e5\u627e\u65f6\u95f4\u590d\u6742\u5ea6\u662fLogN\uff0c\u53ef\u4ee5\u548c\u5e73\u8861\u4e8c\u53c9\u6811\u76f8\u5f53\uff0c\u4f46\u5b9e\u73b0\u8d77\u6765\u53c8\u6bd4\u5b83\u7b80\u5355\u3002<strong>\u8df3\u8dc3\u8868(skiplist)\u662f\u4e00\u79cd\u6709\u5e8f\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u901a\u8fc7\u5728\u67d0\u4e2a\u8282\u70b9\u4e2d\u7ef4\u6301\u591a\u4e2a\u6307\u5411\u5176\u4ed6\u8282\u70b9\u7684\u6307\u9488\uff0c\u4ece\u800c\u8fbe\u5230\u5feb\u901f\u8bbf\u95ee\u8282\u70b9\u7684\u76ee\u7684\u3002<\/strong>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Redis\u4e3a\u4f55\u8fd9\u4e48\u5feb\u2014\u2014\u6570\u636e\u5b58\u50a8&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-201493","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201493","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=201493"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201493\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=201493"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=201493"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=201493"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}