{"id":148,"date":"2020-02-10T12:40:45","date_gmt":"2020-02-10T04:40:45","guid":{"rendered":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=148"},"modified":"2020-02-10T12:40:45","modified_gmt":"2020-02-10T04:40:45","slug":"redis-%e8%bf%87%e6%9c%9f%e7%ad%96%e7%95%a5%e5%92%8c%e5%86%85%e5%ad%98%e6%b7%98%e6%b1%b0%e6%9c%ba%e5%88%b6","status":"publish","type":"post","link":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=148","title":{"rendered":"redis \u8fc7\u671f\u7b56\u7565\u548c\u5185\u5b58\u6dd8\u6c70\u673a\u5236"},"content":{"rendered":"\n<h4 class=\"wp-block-heading\">\u8fc7\u671f\u7b56\u7565<\/h4>\n\n\n\n<p> \u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\uff0c\u5b9a\u671f\u5220\u9664\uff0c\u60f0\u6027\u5220\u9664<br> a.\u6bcf100ms\u68c0\u67e5\u90e8\u5206\u6570\u636e\u662f\u5426\u8fc7\u671f\uff0c\u662f\u7684\u8bdd\u5220\u9664\uff0c\u4e0d\u80fd\u5168\u76d8\u68c0\u67e5\uff0c\u7cfb\u7edf\u53d7\u4e0d\u4e86<br> b.\u6bcf\u6b21\u83b7\u53d6\u6570\u636e\u7684\u65f6\u5019\uff0c\u68c0\u67e5\u662f\u5426\u8fc7\u671f\uff0c\u8fc7\u671f\u4e86\u4e0d\u518d\u8fd4\u56de\uff0c\u540c\u65f6\u5220\u9664<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u5185\u5b58\u6dd8\u6c70\u673a\u5236<\/h4>\n\n\n\n<p>\u5982\u679c\u9700\u8981\u5b58\u50a8\uff0c\u4f46\u662f\u6ca1\u6709\u7a7a\u95f4\u4e86\uff0c\u90a3\u5c31\u8981\u89e6\u53d1\u5185\u5b58\u6dd8\u6c70\u673a\u5236\u4e86<\/p>\n\n\n\n<p> noeviction \u5185\u5b58\u4e0d\u8db3\uff0c\u62a5\u9519 (\u9ed8\u8ba4)<br> allkeys-lru \u79fb\u9664\u6700\u5c11\u4f7f\u7528\u7684 (\u63a8\u8350)<br> allkeys-random \u968f\u673a\u79fb\u9664<br> volatile-lru \u8bbe\u7f6e\u4e86\u8fc7\u671f\u65f6\u95f4\u7684key\u4e2d\uff0c\u79fb\u9664\u6700\u5c11\u4f7f\u7528\u7684<br> volatile-random \u968f\u673a\u79fb\u9664\u8bbe\u7f6e\u4e86\u8fc7\u671f\u65f6\u95f4\u7684key<br> volatile-ttl \u4f18\u5148\u79fb\u9664\u5feb\u8fc7\u671f\u7684key<\/p>\n\n\n\n<p>\u65b0\u589e<br>volatile-lfu\uff1a\u4ece\u5df2\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\u7684\u6570\u636e\u96c6(server.db[i].expires)\u4e2d\u6311\u9009\u6700\u4e0d\u7ecf\u5e38\u4f7f\u7528\u7684\u6570\u636e\u6dd8\u6c70<br>allkeys-lfu\uff1a\u5f53\u5185\u5b58\u4e0d\u8db3\u4ee5\u5bb9\u7eb3\u65b0\u5199\u5165\u6570\u636e\u65f6\uff0c\u5728\u952e\u7a7a\u95f4\u4e2d\uff0c\u79fb\u9664\u6700\u4e0d\u7ecf\u5e38\u4f7f\u7528\u7684key<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">LRU\u7684\u5b9e\u73b0<\/h4>\n\n\n\n<p><em><strong>\u6700\u7b80\u5355\u7684lru<\/strong><\/em>\uff0c\u4e00\u4e2a\u94fe\u8868\u5b9e\u73b0\uff0c\u65b0\u6765\u7684\u5728\u5934\u90e8\uff0c\u65b0\u8bbf\u95ee\u7684\u79fb\u5230\u5934\u90e8\uff0c\u7a7a\u95f4\u4e0d\u8db3\u65f6\uff0c\u79fb\u9664\u5c3e\u90e8\u5143\u7d20\u3002<\/p>\n\n\n\n<p><strong><em>lru-k<\/em><\/strong>\uff0c\u4e00\u4e2a\u8bbf\u95ee\u5386\u53f2\u7684\u94fe\u8868\uff0c\u4e00\u4e2alru\u7684\u94fe\u8868\uff0c\u5148\u8fdb\u5165\u8bbf\u95ee\u5386\u53f2\u94fe\u8868\uff0c\u5e76\u5e26\u6709\u8bbf\u95ee\u6b21\u6570\u7684\u6807\u8bb0\uff0c\u8fbe\u5230k\u6b21\u65f6\uff0c\u8fdb\u5165lru\u5934\u90e8\uff0c\u8bbf\u95ee\u540e\u91cd\u65b0\u6392\u5e8f\uff0c\u6dd8\u6c70lru\u7684\u5c3e\u90e8\u5143\u7d20\u3002<\/p>\n\n\n\n<p class=\"has-text-color has-luminous-vivid-orange-color\">lru\u770b\u4f5c\u662flru-1<\/p>\n\n\n\n<p><strong><em>2queues 2Q<\/em><\/strong><br> \u4e24\u4e2a\u961f\u5217\uff0c\u4e00\u4e2a\u662fFIFO\u961f\u5217\uff0c\u4e00\u4e2a\u662flru\u961f\u5217\u3002FIFO\u961f\u5217\u5143\u7d20\u662f\u7f13\u5b58\u7684\u4e00\u90e8\u5206\uff0c\u67e5\u8be2\u7f13\u5b58\u4f1a\u4ece\u91cc\u9762\u627e\uff0c\u8fd9\u662f2Q\u548clru-2\u7684\u533a\u522b\u3002\u5176\u4f59\u6bd4\u8f83\u7c7b\u4f3c<\/p>\n\n\n\n<p>\u7ee7\u627flinkedHashMap\uff0c\u91cd\u5199removeEldestEntry\u65b9\u6cd5\uff0c\u662f\u6700\u7b80\u5355\u7684\u4e00\u79cd\u65b9\u5f0f\uff1b<br>\n@Override<br>\nprotected boolean removeEldestEntry(java.util.Map.Entry eldest) { <br>\n    return size() &gt; 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