{"id":29266,"date":"2023-01-27T22:49:11","date_gmt":"2023-10-10T15:34:59","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8mongodb%e4%b8%ad%e4%bd%bf%e7%94%a8mapreduce%e3%80%82\/"},"modified":"2025-08-12T13:14:23","modified_gmt":"2025-08-12T05:14:23","slug":"%e5%9c%a8mongodb%e4%b8%ad%e4%bd%bf%e7%94%a8mapreduce%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8mongodb%e4%b8%ad%e4%bd%bf%e7%94%a8mapreduce%e3%80%82\/","title":{"rendered":"\u5728MongoDB\u4e2d\u4f7f\u7528MapReduce"},"content":{"rendered":"<p>\u8bd5\u7740\u7528MapReduce\u805a\u5408\u5b58\u50a8\u5728MongoDB\u4e2d\u7684\u4f4d\u7f6e\u4fe1\u606f\uff0c\u76ee\u6807\u662f\u63a8\u65ad\u201c\u5728\u54ea\u91cc\u505c\u7559\u4e86\u591a\u4e45\u201d\u3002<\/p>\n<p>\u6587\u4ef6\u4e2d\u9884\u8ba1\u5b58\u50a8\u4e86\u7528\u6237ID\u548c\u4f4d\u7f6e\u4fe1\u606f\uff08GeoHash\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nb\">document<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"na\">user_id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"na\">geohash<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">xn75gknsuf<\/span><span class=\"dl\">\"<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5b9a\u4e49\u5730\u56fe\u6620\u5c04\u5668\u3002\u5bf9\u4e8e\u6bcf\u4e00\u4e2aGeoHash\uff0c\u8bbe\u7f6e\u4e3a1\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ mapper\u5b9a\u7fa9<\/span>\r\n<span class=\"kd\">var<\/span> <span class=\"nx\">mapper<\/span> <span class=\"o\">=<\/span> <span class=\"kd\">function<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"nx\">emit<\/span><span class=\"p\">(<\/span><span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">geohash<\/span><span class=\"p\">,<\/span> <span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>Reducer\u7684\u5b9a\u4e49\u3002\u4f20\u5165values\u53c2\u6570\u662f\u7ecf\u8fc7Mapper\u5904\u7406\u7684\u6570\u7ec4\u3002\u5982\u679c\u67093\u4e2a\u76f8\u540c\u7684GeoHash\u503c\uff0c\u5219\u53d8\u6210\u4e00\u4e2a\u6570\u7ec4[1, 1, 1]\u3002\u53ef\u4ee5\u4f7f\u7528Array.sum()\u6765\u6c42\u548c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ reducer\u5b9a\u7fa9<\/span>\r\n<span class=\"kd\">var<\/span> <span class=\"nx\">reducer<\/span> <span class=\"o\">=<\/span> <span class=\"kd\">function<\/span> <span class=\"p\">(<\/span><span class=\"nx\">key<\/span><span class=\"p\">,<\/span> <span class=\"nx\">values<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"k\">return<\/span> <span class=\"nb\">Array<\/span><span class=\"p\">.<\/span><span class=\"nx\">sum<\/span><span class=\"p\">(<\/span><span class=\"nx\">values<\/span><span class=\"p\">);<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5bf9geohashed_location\u96c6\u5408\u6267\u884cMapReduce\u64cd\u4f5c\u3002\u5c06mapper\u548creducer\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\uff0c\u5e76\u53ef\u9009\u62e9\u6027\u5730\u4f20\u9012\u8f93\u51fa\u96c6\u5408\u4f5c\u4e3a\u9009\u9879\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ MapReduce\u5b9f\u884c<\/span>\r\n<span class=\"nx\">db<\/span><span class=\"p\">.<\/span><span class=\"nx\">geohashed_location<\/span><span class=\"p\">.<\/span><span class=\"nx\">mapReduce<\/span><span class=\"p\">(<\/span>\r\n  <span class=\"nx\">mapper<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"nx\">reducer<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"p\">{<\/span>\r\n    <span class=\"na\">query<\/span><span class=\"p\">:<\/span> <span class=\"p\">{},<\/span>\r\n    <span class=\"na\">out<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">geohashed_location_result<\/span><span class=\"dl\">\"<\/span>\r\n  <span class=\"p\">}<\/span>\r\n<span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<p>\u6700\u540e\u7684\u7ed3\u679c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"o\">&gt;<\/span> <span class=\"nx\">db<\/span><span class=\"p\">.<\/span> <span class=\"nx\">geohashed_location_result<\/span><span class=\"p\">.<\/span><span class=\"nx\">find<\/span><span class=\"p\">()<\/span>\r\n<span class=\"p\">{<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">_id<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">wvuw6nyxnm<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">value<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">:<\/span> <span class=\"mi\">41<\/span> <span class=\"p\">}<\/span>\r\n<span class=\"p\">{<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">_id<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">wvuw6nyxnp<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">value<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">:<\/span> <span class=\"mi\">40<\/span> <span class=\"p\">}<\/span>\r\n<span class=\"p\">{<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">_id<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">wvuw6nyxnq<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">value<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">:<\/span> <span class=\"mi\">15<\/span> <span class=\"p\">}<\/span>\r\n<span class=\"p\">{<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">_id<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">wvuw6nyxnr<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">value<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">:<\/span> <span class=\"mi\">41<\/span> <span class=\"p\">}<\/span>\r\n<span class=\"p\">{<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">_id<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">wvuw6nyxp1<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">value<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">:<\/span> <span class=\"mi\">12<\/span> <span class=\"p\">}<\/span>\r\n<span class=\"p\">{<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">_id<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">wvuw6nyxp4<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">value<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">:<\/span> <span class=\"mi\">21<\/span> <span class=\"p\">}<\/span>\r\n<span class=\"p\">{<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">_id<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">wvuw6nyxpm<\/span><span class=\"dl\">\"<\/span><span class=\"p\">,<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">value<\/span><span class=\"dl\">\"<\/span> <span class=\"p\">:<\/span> <span class=\"mi\">1<\/span> <span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u8bd5\u7740\u7528MapReduce\u805a\u5408\u5b58\u50a8\u5728MongoDB\u4e2d\u7684\u4f4d\u7f6e\u4fe1\u606f\uff0c\u76ee\u6807\u662f\u63a8\u65ad\u201c\u5728\u54ea\u91cc\u505c\u7559\u4e86\u591a\u4e45\u201d\u3002 \u6587\u4ef6\u4e2d\u9884\u8ba1\u5b58\u50a8 [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-29266","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5728MongoDB\u4e2d\u4f7f\u7528MapReduce - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8e\u5728MongoDB\u4e2d\u4f7f\u7528MapReduce\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5728mongodb\u4e2d\u4f7f\u7528mapreduce\u3002\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" 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