{"id":157424,"date":"2024-11-02T22:58:20","date_gmt":"2024-11-02T14:58:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/157424\/"},"modified":"2024-11-02T22:58:21","modified_gmt":"2024-11-02T14:58:21","slug":"%e5%b9%b9%e6%8e%89%e5%b9%be%e7%99%be%e8%a1%8c%e7%9a%84%e5%a4%a7-sql%ef%bc%8c%e6%88%91%e7%94%a8-hadoop","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/157424\/","title":{"rendered":"\u5e79\u6389\u5e7e\u767e\u884c\u7684\u5927 SQL\uff0c\u6211\u7528 Hadoop"},"content":{"rendered":"<h1 id=\"%e5%b9%b9%e6%8e%89%e5%b9%be%e7%99%be%e8%a1%8c%e7%9a%84%e5%a4%a7-sql%ef%bc%8c%e6%88%91%e7%94%a8-hadoop-cvaUGCFpwm\">\u5e79\u6389\u5e7e\u767e\u884c\u7684\u5927 SQL\uff0c\u6211\u7528 Hadoop<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u6642\u4ee3\uff0c\u4f01\u696d\u9762\u81e8\u8457\u8655\u7406\u548c\u5206\u6790\u5927\u91cf\u6578\u64da\u7684\u6311\u6230\u3002\u50b3\u7d71\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u5728\u8655\u7406\u5927\u898f\u6a21\u6578\u64da\u6642\uff0c\u5f80\u5f80\u9700\u8981\u7de8\u5beb\u8907\u96dc\u7684 SQL \u67e5\u8a62\uff0c\u9019\u4e0d\u50c5\u8017\u6642\uff0c\u9084\u53ef\u80fd\u5c0e\u81f4\u6027\u80fd\u74f6\u9838\u3002Hadoop \u4f5c\u70ba\u4e00\u7a2e\u5206\u4f48\u5f0f\u8a08\u7b97\u6846\u67b6\uff0c\u63d0\u4f9b\u4e86\u4e00\u7a2e\u66f4\u9ad8\u6548\u7684\u65b9\u5f0f\u4f86\u8655\u7406\u9019\u4e9b\u6578\u64da\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u8655\u7406\u6d77\u91cf\u6578\u64da\u6642\u3002<\/p>\n<h2 id=\"hadoop-%e7%b0%a1%e4%bb%8b-cvaUGCFpwm\">Hadoop \u7c21\u4ecb<\/h2>\n<p>Hadoop \u662f\u4e00\u500b\u958b\u6e90\u7684\u5206\u4f48\u5f0f\u8a08\u7b97\u5e73\u53f0\uff0c\u4e3b\u8981\u7531 Hadoop \u5206\u4f48\u5f0f\u6587\u4ef6\u7cfb\u7d71\uff08HDFS\uff09\u548c MapReduce \u8a08\u7b97\u6a21\u578b\u7d44\u6210\u3002HDFS \u5141\u8a31\u7528\u6236\u5c07\u6578\u64da\u5206\u6563\u5b58\u5132\u5728\u591a\u53f0\u4f3a\u670d\u5668\u4e0a\uff0c\u800c MapReduce \u5247\u63d0\u4f9b\u4e86\u4e00\u7a2e\u4e26\u884c\u8655\u7406\u6578\u64da\u7684\u65b9\u5f0f\u3002\u9019\u4f7f\u5f97 Hadoop \u6210\u70ba\u8655\u7406\u5927\u6578\u64da\u7684\u7406\u60f3\u9078\u64c7\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%81%b8%e6%93%87-hadoop%ef%bc%9f-cvaUGCFpwm\">\u70ba\u4ec0\u9ebc\u9078\u64c7 Hadoop\uff1f<\/h2>\n<ul>\n<li><strong>\u53ef\u64f4\u5c55\u6027\uff1a<\/strong>Hadoop \u53ef\u4ee5\u8f15\u9b06\u5730\u64f4\u5c55\u5230\u6578\u5343\u53f0\u4f3a\u670d\u5668\uff0c\u9019\u610f\u5473\u8457\u7528\u6236\u53ef\u4ee5\u6839\u64da\u9700\u6c42\u589e\u52a0\u66f4\u591a\u7684\u8a08\u7b97\u8cc7\u6e90\u3002<\/li>\n<li><strong>\u6210\u672c\u6548\u76ca\uff1a<\/strong>\u4f7f\u7528\u666e\u901a\u786c\u4ef6\u5373\u53ef\u69cb\u5efa Hadoop \u96c6\u7fa4\uff0c\u9019\u964d\u4f4e\u4e86\u4f01\u696d\u7684\u57fa\u790e\u8a2d\u65bd\u6210\u672c\u3002<\/li>\n<li><strong>\u5bb9\u932f\u6027\uff1a<\/strong>HDFS \u5177\u6709\u81ea\u52d5\u6578\u64da\u5197\u9918\u529f\u80fd\uff0c\u7576\u67d0\u500b\u7bc0\u9ede\u5931\u6548\u6642\uff0c\u7cfb\u7d71\u6703\u81ea\u52d5\u5c07\u6578\u64da\u5f9e\u5176\u4ed6\u7bc0\u9ede\u6062\u5fa9\u3002<\/li>\n<li><strong>\u9748\u6d3b\u6027\uff1a<\/strong>Hadoop \u652f\u6301\u591a\u7a2e\u6578\u64da\u683c\u5f0f\uff0c\u5305\u62ec\u7d50\u69cb\u5316\u3001\u534a\u7d50\u69cb\u5316\u548c\u975e\u7d50\u69cb\u5316\u6578\u64da\uff0c\u9019\u4f7f\u5f97\u7528\u6236\u53ef\u4ee5\u9748\u6d3b\u5730\u8655\u7406\u5404\u985e\u6578\u64da\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-hadoop-%e6%9b%bf%e4%bb%a3%e8%a4%87%e9%9b%9c%e7%9a%84-sql-%e6%9f%a5%e8%a9%a2-cvaUGCFpwm\">\u5982\u4f55\u4f7f\u7528 Hadoop \u66ff\u4ee3\u8907\u96dc\u7684 SQL \u67e5\u8a62<\/h2>\n<p>\u5728\u50b3\u7d71\u7684 SQL \u74b0\u5883\u4e2d\uff0c\u8655\u7406\u5927\u6578\u64da\u96c6\u901a\u5e38\u9700\u8981\u7de8\u5beb\u6578\u767e\u884c\u7684 SQL \u67e5\u8a62\u3002\u9019\u4e0d\u50c5\u589e\u52a0\u4e86\u7dad\u8b77\u7684\u96e3\u5ea6\uff0c\u9084\u53ef\u80fd\u5c0e\u81f4\u6027\u80fd\u554f\u984c\u3002\u4f7f\u7528 Hadoop\uff0c\u60a8\u53ef\u4ee5\u901a\u904e\u7c21\u5316\u7684 MapReduce \u4efb\u52d9\u4f86\u9054\u5230\u76f8\u540c\u7684\u76ee\u7684\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a%e4%bd%bf%e7%94%a8-mapreduce-%e9%80%b2%e8%a1%8c%e6%95%b8%e6%93%9a%e8%99%95%e7%90%86-cvaUGCFpwm\">\u793a\u4f8b\uff1a\u4f7f\u7528 MapReduce \u9032\u884c\u6578\u64da\u8655\u7406<\/h3>\n<pre><code>\npublic class WordCount {\n    public static class TokenizerMapper\n        extends Mapper&lt;Object, Text, Text, IntWritable&gt; {\n        private final static IntWritable one = new IntWritable(1);\n        private Text word = new Text();\n\n        public void map(Object key, Text value, Context context\n        ) throws IOException, InterruptedException {\n            StringTokenizer itr = new StringTokenizer(value.toString());\n            while (itr.hasMoreTokens()) {\n                word.set(itr.nextToken());\n                context.write(word, one);\n            }\n        }\n    }\n\n    public static class IntSumReducer\n        extends Reducer&lt;Text, IntWritable, Text, IntWritable&gt; {\n        private IntWritable result = new IntWritable();\n\n        public void reduce(Text key, Iterable&lt;IntWritable&gt; values,\n                           Context context\n        ) throws IOException, InterruptedException {\n            int sum = 0;\n            for (IntWritable val : values) {\n                sum += val.get();\n            }\n            result.set(sum);\n            context.write(key, result);\n        }\n    }\n}\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7c21\u55ae\u7684 WordCount \u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u4f7f\u7528 MapReduce \u4f86\u8a08\u7b97\u6587\u672c\u4e2d\u6bcf\u500b\u55ae\u8a5e\u7684\u51fa\u73fe\u6b21\u6578\u3002\u9019\u6a23\u7684\u8655\u7406\u65b9\u5f0f\u4e0d\u50c5\u7c21\u5316\u4e86\u4ee3\u78bc\uff0c\u9084\u80fd\u6709\u6548\u5730\u5229\u7528\u5206\u4f48\u5f0f\u8a08\u7b97\u7684\u512a\u52e2\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-cvaUGCFpwm\">\u7d50\u8ad6<\/h2>\n<p>\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u50b3\u7d71\u7684 SQL \u67e5\u8a62\u65b9\u5f0f\u5df2\u7d93\u7121\u6cd5\u6eff\u8db3\u4f01\u696d\u7684\u9700\u6c42\u3002Hadoop \u63d0\u4f9b\u4e86\u4e00\u7a2e\u9ad8\u6548\u3001\u9748\u6d3b\u4e14\u6210\u672c\u6548\u76ca\u9ad8\u7684\u89e3\u6c7a\u65b9\u6848\uff0c\u5e6b\u52a9\u4f01\u696d\u8f15\u9b06\u8655\u7406\u548c\u5206\u6790\u5927\u6578\u64da\u3002\u901a\u904e\u4f7f\u7528 Hadoop\uff0c\u4f01\u696d\u4e0d\u50c5\u80fd\u5920\u7c21\u5316\u6578\u64da\u8655\u7406\u6d41\u7a0b\uff0c\u9084\u80fd\u63d0\u9ad8\u6578\u64da\u5206\u6790\u7684\u6548\u7387\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u904b\u884c\u60a8\u7684 Hadoop \u96c6\u7fa4\uff0cServer.HK \u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u548c\u64f4\u5c55\u60a8\u7684\u6578\u64da\u8655\u7406\u80fd\u529b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f7f\u7528Hadoop\u8f15\u9b06\u8655\u7406\u6578\u767e\u884cSQL\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff0c\u7c21\u5316\u5206\u6790\u6d41\u7a0b\uff0c\u8b93\u5927\u6578\u64da\u7ba1\u7406\u66f4\u9ad8\u6548\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-157424","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/157424","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=157424"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/157424\/revisions"}],"predecessor-version":[{"id":157425,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/157424\/revisions\/157425"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=157424"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=157424"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=157424"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}