{"id":2075,"date":"2023-04-01T21:45:38","date_gmt":"2023-04-01T13:45:38","guid":{"rendered":"https:\/\/www.appblog.cn\/?p=2075"},"modified":"2023-04-06T16:00:50","modified_gmt":"2023-04-06T08:00:50","slug":"how-does-redis-store-user-status-of-billions-of-levels","status":"publish","type":"post","link":"https:\/\/www.appblog.cn\/index.php\/2023\/04\/01\/how-does-redis-store-user-status-of-billions-of-levels\/","title":{"rendered":"Redis \u5982\u4f55\u5b58\u50a8\u4e0a\u4ebf\u7ea7\u522b\u7684\u7528\u6237\u72b6\u6001\uff1f"},"content":{"rendered":"<p>\u524d\u6bb5\u65f6\u95f4\uff0c\u5728\u7f51\u4e0a\u770b\u5230\u4e00\u9053\u9762\u8bd5\u9898\uff1a\u5982\u4f55\u4f7f\u7528Redis\u5b58\u50a8\u7edf\u8ba11\u4ebf\u7528\u6237\u4e00\u5e74\u7684\u767b\u9646\u60c5\u51b5\uff0c\u5e76\u5feb\u901f\u68c0\u7d22\u4efb\u610f\u65f6\u95f4\u7a97\u53e3\u5185\u7684\u6d3b\u8dc3\u7528\u6237\u6570\u91cf\u3002<\/p>\n<p>\u89c9\u5f97\u5f88\u6709\u610f\u601d\uff0c\u5c31\u4ed4\u7ec6\u60f3\u4e86\u4e0b\u3002\u5e76\u505a\u4e86\u4e00\u7cfb\u5217\u5b9e\u9a8c\uff0c\u81ea\u5df1\u6a21\u62df\u4e86\u4e0b\u3002\u8fd8\u662f\u6709\u70b9\u6536\u83b7\u7684\uff0c\u73b0\u6574\u7406\u4e0b\u6765\u3002\u548c\u5927\u5bb6\u4e00\u8d77\u5206\u4eab\u3002<\/p>\n<h2>\u95ee\u9898\u5206\u6790<\/h2>\n<p><!-- more --><\/p>\n<p>Redis\u662f\u4e00\u4e2a\u5185\u5b58\u6570\u636e\u5e93\uff0c\u91c7\u7528\u5355\u7ebf\u7a0b\u548c\u4e8b\u4ef6\u9a71\u52a8\u7684\u673a\u5236\u6765\u5904\u7406\u7f51\u7edc\u8bf7\u6c42\u3002\u5b9e\u9645\u751f\u4ea7\u7684QPS\u548cTPS\u5355\u53f0\u90fd\u80fd\u8fbe\u52303,4W\uff0c\u8bfb\u5199\u6027\u80fd\u975e\u5e38\u68d2\u3002\u7528\u6765\u5b58\u50a8\u4e00\u4e9b\u5bf9\u6838\u5fc3\u4e1a\u52a1\u5f31\u5f71\u54cd\u7684\u7528\u6237\u72b6\u6001\u4fe1\u606f\u8fd8\u662f\u975e\u5e38\u4e0d\u9519\u7684\u3002<\/p>\n<p>\u5bf9\u4e8e\u8fd9\u9898\uff0c\u67092\u4e2a\u91cd\u8981\u7684\u70b9\u9700\u8981\u8003\u8651\uff1a<\/p>\n<ul>\n<li>\u5982\u4f55\u7528\u5408\u9002\u7684\u6570\u636e\u7c7b\u578b\u6765\u5b58\u50a81\u4ebf\u7528\u6237\u7684\u6570\u636e\uff0c\u7528\u666e\u901a\u7684\u5b57\u7b26\u4e32\u6765\u5b58\u50a8\u80af\u5b9a\u4e0d\u884c\u3002\u7ecf\u8fc7\u67e5\u770b\u4e00\u4e2a\u6700\u7b80\u5355\u7684kv(key\u4e3aabc\uff0cvalue\u4e3a1)\u7684\u5185\u5b58\u5360\u7528\uff0c\u53d1\u73b0\u4e3a<code>48byte<\/code><\/li>\n<\/ul>\n<pre><code class=\"language-bash\">$ rdb -c memory -k abc .\/dump.rdb\ndatabase,type,key,size_in_bytes,encoding,num_elements,len_largest_element,expiry\n1,string,abc,48,string,8,8,<\/code><\/pre>\n<p>\u5047\u8bbe\u6bcf\u4e2a\u7528\u6237\u6bcf\u5929\u767b\u9646\u9700\u8981\u5360\u636e1\u5bf9KV\u7684\u8bdd\uff0c\u90a3\u4e00\u4ebf\u5c31\u662f<code>(48*100000000)\/1024\/1024\/1024=4.47G<\/code>\u3002\u8fd9\u8fd8\u662f\u4e00\u5929\u7684\u91cf\u3002<\/p>\n<ul>\n<li>\u5982\u4f55\u6ee1\u8db3\u641c\u7d22\uff0credis\u662f\u4e00\u4e2a\u952e\u503c\u5bf9\u7684\u5185\u5b58\u7ed3\u6784\uff0c\u53ea\u80fd\u6839\u636ekey\u6765\u8fdb\u884c\u5b9a\u4f4dvalue\u503c\uff0c\u65e0\u6cd5\u505a\u5230\u50cfElastic Search\u90a3\u6837\u5bf9\u6587\u6863\u8fdb\u884c\u5012\u6392\u7d22\u5f15\u5feb\u901f\u5168\u6587\u68c0\u7d22\u3002<\/li>\n<\/ul>\n<p>Redis\u5176\u5b9e\u6709\u8fd9\u79cd\u6570\u636e\u7ed3\u6784\u7684\uff0c\u53ef\u4ee5\u4ee5\u5f88\u5c11\u7684\u7a7a\u95f4\u6765\u5b58\u50a8\u5927\u91cf\u7684\u4fe1\u606f\u3002<\/p>\n<h2>bitmap\u5b9e\u73b0<\/h2>\n<p>\u5728Redis 2.2.0\u7248\u672c\u4e4b\u540e\uff0c\u65b0\u589e\u4e86\u4e00\u4e2a\u4f4d\u56fe\u6570\u636e\uff0c\u5176\u5b9e\u5b83\u4e0d\u662f\u4e00\u79cd\u6570\u636e\u7ed3\u6784\u3002\u5b9e\u9645\u4e0a\u5b83\u5c31\u662f\u4e00\u4e2a\u4e00\u4e2a\u5b57\u7b26\u4e32\u7ed3\u6784\uff0c\u53ea\u4e0d\u8fc7value\u662f\u4e00\u4e2a\u4e8c\u8fdb\u5236\u6570\u636e\uff0c\u6bcf\u4e00\u4f4d\u53ea\u80fd\u662f0\u6216\u80051\u3002Redis\u5355\u72ec\u5bf9bitmap\u63d0\u4f9b\u4e86\u4e00\u5957\u547d\u4ee4\u3002\u53ef\u4ee5\u5bf9\u4efb\u610f\u4e00\u4f4d\u8fdb\u884c\u8bbe\u7f6e\u548c\u8bfb\u53d6\u3002<\/p>\n<p>bitmap\u7684\u6838\u5fc3\u547d\u4ee4\uff1a<\/p>\n<p>\uff081\uff09SETBIT<\/p>\n<p>\u8bed\u6cd5\uff1a<code>SETBIT key offset value<\/code><\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre><code class=\"language-bash\">setbit abc 5 1 ----&gt; 00001\n\nsetbit abc 2 1 ----&gt; 00101<\/code><\/pre>\n<p>\uff082\uff09GETBIT<\/p>\n<p>\u8bed\u6cd5\uff1a<code>GETBIT key offset<\/code><\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre><code class=\"language-bash\">getbit abc 5 ----&gt; 1\n\ngetbit abc 1 ----&gt; 0<\/code><\/pre>\n<p>bitmap\u7684\u5176\u4ed6\u547d\u4ee4\u8fd8\u6709<code>bitcount<\/code>\uff0c<code>bitpos<\/code>\uff0c<code>bitop<\/code>\u7b49\u547d\u4ee4\u3002\u90fd\u662f\u5bf9\u4f4d\u7684\u64cd\u4f5c\u3002<\/p>\n<p>\u56e0\u4e3abitmap\u7684\u6bcf\u4e00\u4f4d\u53ea\u5360\u636e1bit\u7684\u7a7a\u95f4\uff0c\u6240\u4ee5\u5229\u7528\u8fd9\u4e2a\u7279\u6027\u6211\u4eec\u53ef\u4ee5\u628a\u6bcf\u4e00\u5929\u4f5c\u4e3akey\uff0cvalue\u4e3a1\u4ebf\u7528\u6237\u7684\u6d3b\u8dc3\u5ea6\u72b6\u6001\u3002\u5047\u8bbe\u4e00\u4e2a\u7528\u6237\u4e00\u5929\u5185\u53ea\u8981\u767b\u5f55\u4e86\u4e00\u6b21\u5c31\u7b97\u6d3b\u8dc3\u3002\u6d3b\u8dc3\u6211\u4eec\u5c31\u8bb0\u4e3a1\uff0c\u4e0d\u6d3b\u8dc3\u6211\u4eec\u5c31\u8bb0\u4e3a0\u3002\u628a\u7528\u6237Id\u4f5c\u4e3a\u504f\u79fb\u91cf(offset)\u3002\u8fd9\u6837\u6211\u4eec\u4e00\u4e2akey\u5c31\u53ef\u4ee5\u5b58\u50a81\u4ebf\u7528\u6237\u7684\u6d3b\u8dc3\u72b6\u6001\u3002<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.yezhou.me\/AppBlog\/images\/\u6570\u636e\u5e93\/Redis%20Bitmap\u7528\u6237\u72b6\u6001\u5b58\u50a8.png\" alt=\"Redis Bitmap\u7528\u6237\u72b6\u6001\u5b58\u50a8\" \/><\/p>\n<p>\u6211\u4eec\u518d\u6765\u7b97\u4e0b\uff0c\u8fd9\u6837\u4e00\u4e2a\u4f4d\u56fe\u7ed3\u6784\u7684\u503c\u5bf9\u8c61\u5360\u636e\u591a\u5c11\u7a7a\u95f4\u3002\u6bcf\u4e00\u4e2a\u4f4d\u662f1bit\uff0c\u4e00\u4ebf\u7528\u6237\u5c31\u662f\u4e00\u4ebfbit\u30028bit=1Byte<\/p>\n<p><code>100000000\/8\/1024\/1024=11.92M<\/code><\/p>\n<p>\u6211\u7528\u6d4b\u8bd5\u5de5\u7a0b\u5f80\u4e00\u4e2akey\u91cc\u901a\u8fc7lua\u585e\u8fdb\u4e861\u4ebf\u4e2abit\uff0c\u7136\u540e\u7528<code>rdb tools<\/code>\u5bf9\u5185\u5b58\u8fdb\u884c\u7edf\u8ba1\uff0c\u5b9e\u6d4b\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"language-bash\">$ rdb -c memory -n 3 .\/dump.rdb\ndatabase,type,key,size_in_bytes,encoding,num_elements,len_largest_element,expiry\n3,string,2019-01-01,12582968,string,12500001,12500001,<\/code><\/pre>\n<p>\u4e00\u59291\u4ebf\u7528\u6237\u4e5f\u5c31\u6d88\u801712M\u7684\u5185\u5b58\u7a7a\u95f4\u3002\u8fd9\u5b8c\u5168\u7b26\u5408\u8981\u6c42\u30021\u5e74\u7684\u8bdd\u4e5f\u5c314\u4e2aG\u3002\u51e0\u5e74\u4e0b\u6765\u7684\u8bdd\uff0cRedis\u53ef\u4ee5\u96c6\u7fa4\u90e8\u7f72\u6765\u8fdb\u884c\u6269\u5bb9\u5b58\u50a8\u3002\u6211\u4eec\u4e5f\u53ef\u4ee5\u7528\u4f4d\u56fe\u538b\u7f29\u7b97\u6cd5\u5bf9bitmap\u8fdb\u884c\u538b\u7f29\u5b58\u50a8\u3002\u4f8b\u5982<code>WAH<\/code>\uff0c<code>EWAH<\/code>\uff0c<code>Roaring Bitmaps<\/code>\u3002\u8fd9\u4e2a\u4ee5\u540e\u53ef\u4ee5\u5355\u72ec\u62c9\u51fa\u6765\u804a\u804a\u3002<\/p>\n<p>\u6211\u4eec\u628a\u6bcf\u4e00\u59291\u4ebf\u7528\u6237\u7684\u767b\u9646\u72b6\u6001\u90fd\u7528bitmap\u7684\u5f62\u5f0f\u5b58\u8fdb\u4e86Redis\uff0c\u90a3\u8981\u83b7\u53d6\u67d0\u4e00\u5929id\u4e3a88000\u7684\u7528\u6237\u662f\u5426\u6d3b\u8dc3\uff0c\u76f4\u63a5\u4f7f\u7528<code>getbit<\/code>\u547d\u4ee4\uff1a<\/p>\n<pre><code class=\"language-bash\">getbit 2020-01-01 88000 [\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(1)]<\/code><\/pre>\n<p>\u5982\u679c\u8981\u7edf\u8ba1\u67d0\u4e00\u5929\u7684\u6240\u6709\u7684\u6d3b\u8dc3\u7528\u6237\u6570\uff0c\u4f7f\u7528<code>bitcount<\/code>\u547d\u4ee4\uff0c<code>bitcount<\/code>\u53ef\u4ee5\u7edf\u8ba11\u7684\u4e2a\u6570\uff0c\u4e5f\u5c31\u662f\u6d3b\u8dc3\u7528\u6237\u6570\uff1a<\/p>\n<pre><code class=\"language-bash\">bitcount 2019-01-01 [\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(N)]<\/code><\/pre>\n<p>\u5982\u679c\u8981\u7edf\u8ba1\u67d0\u4e00\u6bb5\u65f6\u95f4\u5185\u7684\u6d3b\u8dc3\u7528\u6237\u6570\uff0c\u9700\u8981\u7528\u5230<code>bitop<\/code>\u547d\u4ee4\u3002\u8fd9\u4e2a\u547d\u4ee4\u63d0\u4f9b\u56db\u79cd\u4f4d\u8fd0\u7b97\uff0cAND(\u4e0e)\uff0c(OR)\u6216\uff0cXOR(\u4ea6\u6216)\uff0cNOT(\u975e)\u3002\u6211\u4eec\u53ef\u4ee5\u5bf9\u67d0\u4e00\u6bb5\u65f6\u95f4\u5185\u7684\u6240\u6709key\u8fdb\u884cOR(\u6216)\u64cd\u4f5c\uff0c\u6216\u64cd\u4f5c\u51fa\u6765\u7684\u4f4d\u56fe\u662f0\u7684\u5c31\u4ee3\u8868\u8fd9\u6bb5\u65f6\u95f4\u5185\u4e00\u6b21\u90fd\u6ca1\u6709\u767b\u9646\u7684\u7528\u6237\u3002\u90a3\u53ea\u8981\u6211\u4eec\u6c42\u51fa1\u7684\u4e2a\u6570\u5c31\u53ef\u4ee5\u4e86\u3002\u4ee5\u4e0b\u4f8b\u5b50\u6c42\u51fa\u4e862019-01-01\u52302019-01-05\u8fd9\u6bb5\u65f6\u95f4\u5185\u7684\u6d3b\u8dc3\u7528\u6237\u6570\u3002<\/p>\n<pre><code class=\"language-bash\">bitop or result 2019-01-01 2019-01-02 2019-01-03 2019-01-04 2019-01-05 [\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(N)]\n\nbitcount result<\/code><\/pre>\n<p>\u4ece\u65f6\u95f4\u590d\u6742\u5ea6\u4e0a\u8bf4\uff0c\u65e0\u8bba\u662f\u7edf\u8ba1\u67d0\u4e00\u5929\uff0c\u8fd8\u662f\u7edf\u8ba1\u4e00\u6bb5\u65f6\u95f4\u3002\u5728\u5b9e\u9645\u6d4b\u8bd5\u65f6\uff0c\u57fa\u672c\u4e0a\u90fd\u662f\u79d2\u51fa\u7684\u3002\u7b26\u5408\u6211\u4eec\u7684\u9884\u671f\u3002<\/p>\n<h2>bitmap\u603b\u7ed3<\/h2>\n<p>bitmap\u53ef\u4ee5\u5f88\u597d\u7684\u6ee1\u8db3\u4e00\u4e9b\u9700\u8981\u8bb0\u5f55\u5927\u91cf\u800c\u7b80\u5355\u4fe1\u606f\u7684\u573a\u666f\u3002\u6240\u5360\u7a7a\u95f4\u5341\u5206\u5c0f\u3002\u901a\u5e38\u6765\u8bf4\u4f7f\u7528\u573a\u666f\u52062\u7c7b\uff1a<\/p>\n<ol>\n<li>\n<p>\u67d0\u4e00\u4e1a\u52a1\u5bf9\u8c61\u7684\u6a2a\u5411\u6269\u5c55\uff0ckey\u4e3a\u67d0\u4e00\u4e2a\u4e1a\u52a1\u5bf9\u8c61\u7684id\uff0c\u6bd4\u5982\u8bb0\u5f55\u67d0\u4e00\u4e2a\u7ec8\u7aef\u7684\u529f\u80fd\u5f00\u5173\uff0c1\u4ee3\u8868\u5f00\uff0c0\u4ee3\u8868\u5173\u3002\u57fa\u672c\u53ef\u4ee5\u65e0\u9650\u6269\u5c55\uff0c\u53ef\u4ee5\u8bb0\u5f552^32\u4e2a\u4f4d\u4fe1\u606f\u3002\u4e0d\u8fc7\u8fd9\u79cd\u7528\u6cd5\u7531\u4e8ekey\u4e0a\u5e26\u6709\u4e86\u4e1a\u52a1\u5bf9\u8c61\u7684id\uff0c\u5bfc\u81f4\u4e86key\u7684\u5b58\u50a8\u7a7a\u95f4\u5927\u4e8e\u4e86value\u7684\u5b58\u50a8\u7a7a\u95f4\uff0c\u4ece\u7a7a\u95f4\u4f7f\u7528\u89d2\u5ea6\u4e0a\u6765\u770b\u6709\u4e00\u5b9a\u7684\u4f18\u5316\u7a7a\u95f4\u3002<\/p>\n<\/li>\n<li>\n<p>\u67d0\u4e00\u4e1a\u52a1\u7684\u7eb5\u5411\u6269\u5c55\uff0ckey\u4e3a\u67d0\u4e00\u4e2a\u4e1a\u52a1\uff0c\u628a\u6bcf\u4e00\u4e2a\u4e1a\u52a1\u5bf9\u8c61\u7684id\u4f5c\u4e3a\u504f\u79fb\u91cf\u8bb0\u5f55\u5230\u4f4d\u4e0a\u3002\u8fd9\u9053\u9762\u8bd5\u9898\u7684\u4f8b\u5b50\u5c31\u662f\u7528\u6b64\u6cd5\u6765\u8fdb\u884c\u89e3\u51b3\u3002\u5341\u5206\u5de7\u5999\u7684\u5229\u7528\u4e86\u7528\u6237\u7684id\u4f5c\u4e3a\u504f\u79fb\u91cf\u6765\u627e\u5230\u76f8\u5bf9\u5e94\u7684\u503c\u3002\u5f53\u4e1a\u52a1\u5bf9\u8c61\u6570\u91cf\u8d85\u8fc72^32\u65f6\uff08\u7ea6\u7b49\u4e8e42\u4ebf\uff09\uff0c\u8fd8\u53ef\u4ee5\u5206\u7247\u5b58\u50a8\u3002<\/p>\n<\/li>\n<\/ol>\n<p>\u770b\u8d77\u6765bitmap\u5b8c\u7f8e\u7684\u89e3\u51b3\u4e86\u5b58\u50a8\u548c\u7edf\u8ba1\u7684\u95ee\u9898\u3002\u90a3\u6709\u6ca1\u6709\u6bd4\u8fd9\u4e2a\u66f4\u52a0\u7701\u7a7a\u95f4\u7684\u5b58\u50a8\u5417\uff1f<\/p>\n<p>\u7b54\u6848\u662f\u6709\u7684\u3002<\/p>\n<h2>HyperLogLog\u5b9e\u73b0<\/h2>\n<p>Redis\u4ece2.8.9\u4e4b\u540e\u589e\u52a0\u4e86HyperLogLog\u6570\u636e\u7ed3\u6784\u3002\u8fd9\u4e2a\u6570\u636e\u7ed3\u6784\uff0c\u6839\u636eredis\u7684\u5b98\u7f51\u4ecb\u7ecd\uff0c\u8fd9\u662f\u4e00\u4e2a\u6982\u7387\u6570\u636e\u7ed3\u6784\uff0c\u7528\u6765\u4f30\u7b97\u6570\u636e\u7684\u57fa\u6570\u3002\u80fd\u901a\u8fc7\u727a\u7272\u51c6\u786e\u7387\u6765\u51cf\u5c11\u5185\u5b58\u7a7a\u95f4\u7684\u6d88\u8017\u3002<\/p>\n<p>\u6211\u4eec\u5148\u6765\u770b\u770bHyperLogLog\u7684\u65b9\u6cd5<\/p>\n<ul>\n<li><code>PFADD<\/code>\uff1a\u6dfb\u52a0\u4e00\u4e2a\u5143\u7d20\uff0c\u5982\u679c\u91cd\u590d\uff0c\u53ea\u7b97\u4f5c\u4e00\u4e2a<\/li>\n<li><code>PFCOUNT<\/code>\uff1a\u8fd4\u56de\u5143\u7d20\u6570\u91cf\u7684\u8fd1\u4f3c\u503c<\/li>\n<li><code>PFMERGE<\/code>\uff1a\u5c06\u591a\u4e2a HyperLogLog \u5408\u5e76\u4e3a\u4e00\u4e2a HyperLogLog<\/li>\n<\/ul>\n<p>\u8fd9\u5f88\u597d\u7406\u89e3\uff0c\u662f\u4e0d\u662f\u3002\u90a3\u6211\u4eec\u5c31\u6765\u770b\u770b\u540c\u6837\u662f\u5b58\u50a8\u4e00\u4ebf\u7528\u6237\u7684\u6d3b\u8dc3\u5ea6\uff0cHyperLogLog\u6570\u636e\u7ed3\u6784\u9700\u8981\u591a\u5c11\u7a7a\u95f4\u3002\u662f\u4e0d\u662f\u6bd4bitmap\u66f4\u52a0\u7701\u7a7a\u95f4\u5462\u3002<\/p>\n<p>\u6211\u901a\u8fc7\u6d4b\u8bd5\u5de5\u7a0b\u5f80HyperLogLog\u91ccPFADD\u4e86\u4e00\u4ebf\u4e2a\u5143\u7d20\u3002\u901a\u8fc7<code>rdb tools<\/code>\u5de5\u5177\u7edf\u8ba1\u4e86\u8fd9\u4e2akey\u7684\u4fe1\u606f\uff1a<\/p>\n<pre><code class=\"language-bash\">$ rdb -c memory -n 2 .\/dump.rdb\ndatabase,type,key,size_in_bytes,encoding,num_elements,len_largest_element,expiry\n2,string,2019-01-01,14392,string,12304,12304,<\/code><\/pre>\n<p>\u53ea\u9700\u898114392 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HyperLogLog \u9002\u5408\u5728\u6bd4\u5982\u7edf\u8ba1\u65e5\u6d3b\u6708\u6d3b\u6b64\u7c7b\u7684\u5bf9\u7cbe\u5ea6\u8981\u4e0d\u4e0d\u9ad8\u7684\u573a\u666f\u3002<\/p>\n<p>HyperLogLog\u4f7f\u7528\u6982\u7387\u7b97\u6cd5\u6765\u7edf\u8ba1\u96c6\u5408\u7684\u8fd1\u4f3c\u57fa\u6570\u3002\u800c\u5b83\u7b97\u6cd5\u7684\u6700\u672c\u6e90\u5219\u662f\u4f2f\u52aa\u5229\u8fc7\u7a0b\u3002<\/p>\n<p>\u4f2f\u52aa\u5229\u8fc7\u7a0b\u5c31\u662f\u4e00\u4e2a\u629b\u786c\u5e01\u5b9e\u9a8c\u7684\u8fc7\u7a0b\u3002\u629b\u4e00\u679a\u6b63\u5e38\u786c\u5e01\uff0c\u843d\u5730\u53ef\u80fd\u662f\u6b63\u9762\uff0c\u4e5f\u53ef\u80fd\u662f\u53cd\u9762\uff0c\u4e8c\u8005\u7684\u6982\u7387\u90fd\u662f 1\/2 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max}<\/code>\u6765\u4f5c\u4e3an\u7684\u4f30\u8ba1\u503c\u3002\u4e5f\u5c31\u662f\u8bf4\u4f60\u53ef\u4ee5\u6839\u636e\u6700\u5927\u6295\u63b7\u6b21\u6570\u8fd1\u4f3c\u7684\u63a8\u7b97\u51fa\u8fdb\u884c\u4e86\u51e0\u6b21\u4f2f\u52aa\u5229\u8fc7\u7a0b\u3002<\/p>\n<h2>\u603b\u7ed3<\/h2>\n<p>\u867d\u7136HyperLogLog\u6570\u636e\u7c7b\u578b\u8fd9\u4e48\u725b\u903c\uff0c\u4f46\u7ec8\u7a76\u4e0d\u662f\u7cbe\u786e\u7edf\u8ba1\u3002\u53ea\u9002\u7528\u4e8e\u5bf9\u7cbe\u5ea6\u8981\u6c42\u4e0d\u9ad8\u7684\u573a\u666f\u3002\u800c\u4e14\u8fd9\u79cd\u7c7b\u578b\u65e0\u6cd5\u5f97\u51fa\u6bcf\u4e2a\u7528\u6237\u7684\u6d3b\u8dc3\u5ea6\u4fe1\u606f\u3002\u6bd5\u7adf\u53ea\u670914K\u561b\u3002\u4e5f\u4e0d\u53ef\u80fd\u5b58\u50a8\u4e0b\u90a3\u4e48\u591a\u6570\u91cf\u7684\u4fe1\u606f\u3002<\/p>\n<p>\u603b\u7ed3\u4e00\u4e0b\uff1a\u5bf9\u4e8e\u6587\u7ae0\u5f00\u5934\u6240\u63d0\u5230\u7684\u9762\u8bd5\u9898\u6765\u8bf4\uff0c\u7528bitmap\u548cHyperLogLog\u90fd\u53ef\u4ee5\u89e3\u51b3\u3002<\/p>\n<p>bitmap\u7684\u4f18\u52bf\u662f\uff1a\u975e\u5e38\u5747\u8861\u7684\u7279\u6027\uff0c\u7cbe\u51c6\u7edf\u8ba1\uff0c\u53ef\u4ee5\u5f97\u5230\u6bcf\u4e2a\u7edf\u8ba1\u5bf9\u8c61\u7684\u72b6\u6001\uff0c\u79d2\u51fa\u3002\u7f3a\u70b9\u662f\uff1a\u5f53\u4f60\u7684\u7edf\u8ba1\u5bf9\u8c61\u6570\u91cf\u5341\u5206\u5341\u5206\u5de8\u5927\u65f6\uff0c\u53ef\u80fd\u4f1a\u5360\u7528\u5230\u4e00\u70b9\u5b58\u50a8\u7a7a\u95f4\uff0c\u4f46\u4e5f\u53ef\u5728\u63a5\u53d7\u8303\u56f4\u5185\u3002\u4e5f\u53ef\u4ee5\u901a\u8fc7\u5206\u7247\uff0c\u6216\u8005\u538b\u7f29\u7684\u989d\u5916\u624b\u6bb5\u53bb\u89e3\u51b3\u3002<\/p>\n<p>HyperLogLog\u7684\u4f18\u52bf\u662f\uff1a\u53ef\u4ee5\u7edf\u8ba1\u5938\u5f20\u5230\u65e0\u6cd5\u60f3\u8c61\u7684\u6570\u91cf\uff0c\u5e76\u4e14\u5360\u7528\u5c0f\u7684\u5938\u5f20\u7684\u5185\u5b58\u3002\u7f3a\u70b9\u662f\uff1a\u5efa\u7acb\u5728\u727a\u7272\u51c6\u786e\u7387\u7684\u57fa\u7840\u4e0a\uff0c\u800c\u4e14\u65e0\u6cd5\u5f97\u5230\u6bcf\u4e2a\u7edf\u8ba1\u5bf9\u8c61\u7684\u72b6\u6001\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u524d\u6bb5\u65f6\u95f4\uff0c\u5728\u7f51\u4e0a\u770b\u5230\u4e00\u9053\u9762\u8bd5\u9898\uff1a\u5982\u4f55\u4f7f\u7528Redis\u5b58\u50a8\u7edf\u8ba11\u4ebf\u7528\u6237\u4e00\u5e74\u7684\u767b\u9646\u60c5\u51b5\uff0c\u5e76\u5feb\u901f\u68c0\u7d22\u4efb\u610f\u65f6\u95f4\u7a97\u53e3\u5185\u7684\u6d3b [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[],"class_list":["post-2075","post","type-post","status-publish","format-standard","hentry","category-redis"],"_links":{"self":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/2075","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/comments?post=2075"}],"version-history":[{"count":0,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/2075\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/media?parent=2075"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/categories?post=2075"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/tags?post=2075"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}