{"id":117675,"date":"2024-03-23T11:20:51","date_gmt":"2024-03-23T02:20:51","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%aemapreduce%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%a6%e3%82%ad%e3%83%bc%e5%80%a4%e3%81%ab%e3%82%88%e3%82%8b%e3%83%87%e3%83%bc%e3%82%bf%e3%81%ae%e7%b5%90%e5%90%88\/"},"modified":"2024-03-28T10:55:33","modified_gmt":"2024-03-28T01:55:33","slug":"java%e3%81%aemapreduce%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%a6%e3%82%ad%e3%83%bc%e5%80%a4%e3%81%ab%e3%82%88%e3%82%8b%e3%83%87%e3%83%bc%e3%82%bf%e3%81%ae%e7%b5%90%e5%90%88","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%aemapreduce%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%a6%e3%82%ad%e3%83%bc%e5%80%a4%e3%81%ab%e3%82%88%e3%82%8b%e3%83%87%e3%83%bc%e3%82%bf%e3%81%ae%e7%b5%90%e5%90%88\/","title":{"rendered":"Java\u306eMapReduce\u3092\u4f7f\u7528\u3057\u3066\u30ad\u30fc\u5024\u306b\u3088\u308b\u30c7\u30fc\u30bf\u306e\u7d50\u5408"},"content":{"rendered":"<p>Java\u3067\u306fMapReduce\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3092\u5229\u7528\u3057\u3066\u3001\u30ad\u30fc\u5024\u306b\u57fa\u3065\u3044\u3066\u30c7\u30fc\u30bf\u3092\u7d71\u5408\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u7c21\u5358\u306a\u30b3\u30fc\u30c9\u306e\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.io.IOException;\r\n<span class=\"hljs-keyword\">import<\/span> java.util.ArrayList;\r\n<span class=\"hljs-keyword\">import<\/span> java.util.List;\r\n<span class=\"hljs-keyword\">import<\/span> java.util.StringTokenizer;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.hadoop.conf.Configuration;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.hadoop.fs.Path;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.hadoop.io.IntWritable;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.hadoop.io.Text;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.hadoop.mapreduce.Job;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.hadoop.mapreduce.Mapper;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.hadoop.mapreduce.Reducer;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.hadoop.mapreduce.lib.input.FileInputFormat;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">KeyValueMerge<\/span> {\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">TokenizerMapper<\/span>\r\n<span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title class_\">Mapper<\/span>&lt;Object, Text, Text, IntWritable&gt; {\r\n<span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">final<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-type\">IntWritable<\/span> <span class=\"hljs-variable\">one<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">IntWritable<\/span>(<span class=\"hljs-number\">1<\/span>);\r\n<span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-type\">Text<\/span> <span class=\"hljs-variable\">word<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Text<\/span>();\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">map<\/span><span class=\"hljs-params\">(Object key, Text value, Context context\r\n)<\/span> <span class=\"hljs-keyword\">throws<\/span> IOException, InterruptedException {\r\n<span class=\"hljs-type\">StringTokenizer<\/span> <span class=\"hljs-variable\">itr<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">StringTokenizer<\/span>(value.toString());\r\n<span class=\"hljs-keyword\">while<\/span> (itr.hasMoreTokens()) {\r\nword.set(itr.nextToken());\r\ncontext.write(word, one);\r\n}\r\n}\r\n}\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">IntSumReducer<\/span>\r\n<span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title class_\">Reducer<\/span>&lt;Text, IntWritable, Text, IntWritable&gt; {\r\n<span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-type\">IntWritable<\/span> <span class=\"hljs-variable\">result<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">IntWritable<\/span>();\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">reduce<\/span><span class=\"hljs-params\">(Text key, Iterable&lt;IntWritable&gt; values,\r\nContext context\r\n)<\/span> <span class=\"hljs-keyword\">throws<\/span> IOException, InterruptedException {\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">sum<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">0<\/span>;\r\n<span class=\"hljs-keyword\">for<\/span> (IntWritable val : values) {\r\nsum += val.get();\r\n}\r\nresult.set(sum);\r\ncontext.write(key, result);\r\n}\r\n}\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> <span class=\"hljs-keyword\">throws<\/span> Exception {\r\n<span class=\"hljs-type\">Configuration<\/span> <span class=\"hljs-variable\">conf<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Configuration<\/span>();\r\n<span class=\"hljs-type\">Job<\/span> <span class=\"hljs-variable\">job<\/span> <span class=\"hljs-operator\">=<\/span> Job.getInstance(conf, <span class=\"hljs-string\">\"key value merge\"<\/span>);\r\njob.setJarByClass(KeyValueMerge.class);\r\njob.setMapperClass(TokenizerMapper.class);\r\njob.setCombinerClass(IntSumReducer.class);\r\njob.setReducerClass(IntSumReducer.class);\r\njob.setOutputKeyClass(Text.class);\r\njob.setOutputValueClass(IntWritable.class);\r\nFileInputFormat.addInputPath(job, <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Path<\/span>(args[<span class=\"hljs-number\">0<\/span>]));\r\nFileOutputFormat.setOutputPath(job, <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Path<\/span>(args[<span class=\"hljs-number\">1<\/span>]));\r\nSystem.exit(job.waitForCompletion(<span class=\"hljs-literal\">true<\/span>) ? <span class=\"hljs-number\">0<\/span> : <span class=\"hljs-number\">1<\/span>);\r\n}\r\n}\r\n<\/code><\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u3001TokenizerMapper\u30af\u30e9\u30b9\u3092Map\u30bf\u30b9\u30af\u3068\u3057\u3066\u5b9a\u7fa9\u3057\u3001StringTokenizer\u3092\u4f7f\u3063\u3066\u5165\u529b\u30c6\u30ad\u30b9\u30c8\u3092\u5358\u8a9e\u306b\u5206\u5272\u3057\u3001\u5404\u5358\u8a9e\u3092\u30ad\u30fc\u3068\u3057\u3066\u3001\u5024\u30921\u306b\u8a2d\u5b9a\u3057\u3001\u305d\u306e\u5f8c\u3001\u30ad\u30fc\u30d0\u30ea\u30e5\u30fc\u30da\u30a2\u3092Reducer\u30bf\u30b9\u30af\u306b\u51fa\u529b\u3057\u307e\u3059\u3002<\/p>\n<p>Reducer\u30bf\u30b9\u30af\u306fIntSumReducer\u30af\u30e9\u30b9\u306b\u3088\u3063\u3066\u5b9f\u88c5\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u30af\u30e9\u30b9\u306f\u540c\u3058\u30ad\u30fc\u306e\u5024\u306e\u30b0\u30eb\u30fc\u30d7\u3092\u53d7\u3051\u53d6\u308a\u3001\u305d\u308c\u3089\u3092\u8db3\u3057\u5408\u308f\u305b\u3066\u3001\u30ad\u30fc\u30d0\u30ea\u30e5\u30fc\u30da\u30a2\u3092\u51fa\u529b\u3057\u307e\u3059\u3002<\/p>\n<p>main\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u3001\u5165\u529b\u30d1\u30b9\u3001\u51fa\u529b\u30d1\u30b9\u3001\u4f7f\u7528\u3055\u308c\u308bMapper\u30af\u30e9\u30b9\u3068Reducer\u30af\u30e9\u30b9\u306a\u3069\u3001\u30b8\u30e7\u30d6\u306e\u5404\u7a2e\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u8a2d\u5b9a\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u3053\u306e\u4f8b\u3092MapReduce\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067\u5b9f\u884c\u3059\u308b\u306b\u306f\u3001\u30b3\u30fc\u30c9\u3092JAR\u30d5\u30a1\u30a4\u30eb\u3068\u3057\u3066\u30d1\u30c3\u30b1\u30fc\u30b8\u5316\u3057\u3001Hadoop\u30af\u30e9\u30b9\u30bf\u30fc\u3067\u305d\u308c\u3092\u5b9f\u884c\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002Hadoop\u30af\u30e9\u30b9\u30bf\u30fc\u304c\u3059\u3067\u306b\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u69cb\u6210\u3055\u308c\u3066\u3044\u308b\u3082\u306e\u3068\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3053\u306e\u4f8b\u3092\u5b9f\u884c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>hadoop jar KeyValueMerge.jar KeyValueMerge &lt;input-dir&gt; &lt;output-dir&gt;\r\n<\/code><\/pre>\n<p>KeyValueMerge.jar \u306f\u30d1\u30c3\u30b1\u30fc\u30b8\u3055\u308c\u305f JAR \u30d5\u30a1\u30a4\u30eb\u3067\u3001 \u306f\u5165\u529b\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3001 \u306f\u51fa\u529b\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u306fMapReduce\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3092\u5229\u7528\u3057\u3066\u3001\u30ad\u30fc\u5024\u306b\u57fa\u3065\u3044\u3066\u30c7\u30fc\u30bf\u3092\u7d71\u5408\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u7c21\u5358\u306a\u30b3\u30fc\u30c9\u306e\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002 import java.io.IOException; import java.util [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-117675","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"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>Java\u306eMapReduce\u3092\u4f7f\u7528\u3057\u3066\u30ad\u30fc\u5024\u306b\u3088\u308b\u30c7\u30fc\u30bf\u306e\u7d50\u5408 - Blog - Silicon Cloud<\/title>\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\/ja\/blog\/java\u306emapreduce\u3092\u4f7f\u7528\u3057\u3066\u30ad\u30fc\u5024\u306b\u3088\u308b\u30c7\u30fc\u30bf\u306e\u7d50\u5408\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u306eMapReduce\u3092\u4f7f\u7528\u3057\u3066\u30ad\u30fc\u5024\u306b\u3088\u308b\u30c7\u30fc\u30bf\u306e\u7d50\u5408\" \/>\n<meta property=\"og:description\" content=\"Java\u3067\u306fMapReduce\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3092\u5229\u7528\u3057\u3066\u3001\u30ad\u30fc\u5024\u306b\u57fa\u3065\u3044\u3066\u30c7\u30fc\u30bf\u3092\u7d71\u5408\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u7c21\u5358\u306a\u30b3\u30fc\u30c9\u306e\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002 import java.io.IOException; import java.util [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u306emapreduce\u3092\u4f7f\u7528\u3057\u3066\u30ad\u30fc\u5024\u306b\u3088\u308b\u30c7\u30fc\u30bf\u306e\u7d50\u5408\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" 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