{"id":10682,"date":"2024-03-15T05:32:18","date_gmt":"2024-03-14T20:32:18","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/hadoop%e3%81%ae%e3%82%b7%e3%83%aa%e3%82%a2%e3%83%a9%e3%82%a4%e3%82%ba%e3%81%a8%e3%83%87%e3%82%b7%e3%83%aa%e3%82%a2%e3%83%a9%e3%82%a4%e3%82%ba%e3%81%af%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86%e3%81%ab\/"},"modified":"2025-08-05T04:16:59","modified_gmt":"2025-08-04T19:16:59","slug":"hadoop%e3%81%ae%e3%82%b7%e3%83%aa%e3%82%a2%e3%83%a9%e3%82%a4%e3%82%ba%e3%81%a8%e3%83%87%e3%82%b7%e3%83%aa%e3%82%a2%e3%83%a9%e3%82%a4%e3%82%ba%e3%81%af%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86%e3%81%ab","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/hadoop%e3%81%ae%e3%82%b7%e3%83%aa%e3%82%a2%e3%83%a9%e3%82%a4%e3%82%ba%e3%81%a8%e3%83%87%e3%82%b7%e3%83%aa%e3%82%a2%e3%83%a9%e3%82%a4%e3%82%ba%e3%81%af%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86%e3%81%ab\/","title":{"rendered":"Hadoop\u306e\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3068\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u306f\u3069\u306e\u3088\u3046\u306b\u5b9f\u88c5\u3055\u308c\u308b\u306e\u304b\u3002"},"content":{"rendered":"<p>Hadoop\u306e\u30b7\u30ea\u30a2\u30e9\u30a4\u30bc\u30fc\u30b7\u30e7\u30f3\u3068\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30bc\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u4e3b\u306bWritable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3068WritableComparable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u3088\u3063\u3066\u5b9f\u88c5\u3055\u308c\u307e\u3059\u3002Writable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306f\u3001\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u304a\u3088\u3073\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u53ef\u80fd\u306a\u30c7\u30fc\u30bf\u578b\u3092\u5b9a\u7fa9\u3057\u3001WritableComparable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306f\u3001\u6bd4\u8f03\u30e1\u30bd\u30c3\u30c9\u3092\u8ffd\u52a0\u3057\u305fWritable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u62e1\u5f35\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u304a\u3088\u3073\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3092\u5b9f\u73fe\u3059\u308b\u306b\u306f\u3001\u6b21\u306e\u624b\u9806\u306b\u5f93\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n<ol>\n<li>Writable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3059\u308b\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3057\u3001\u305d\u306e\u30af\u30e9\u30b9\u306b\u306f\u30b7\u30ea\u30a2\u30eb\u5316\u304a\u3088\u3073\u30c7\u30b7\u30ea\u30a2\u30eb\u5316\u304c\u5fc5\u8981\u306a\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u542b\u3081\u3001write\u304a\u3088\u3073readFields\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3057\u3066\u30b7\u30ea\u30a2\u30eb\u5316\u304a\u3088\u3073\u30c7\u30b7\u30ea\u30a2\u30eb\u5316\u64cd\u4f5c\u3092\u5b9f\u73fe\u3059\u308b\u3002<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">MyWritable<\/span> <span class=\"hljs-keyword\">implements<\/span> <span class=\"hljs-title class_\">Writable<\/span> {\r\n    <span class=\"hljs-keyword\">private<\/span> String field1;\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-type\">int<\/span> field2;\r\n    \r\n    <span class=\"hljs-comment\">\/\/ \u5fc5\u987b\u5b9e\u73b0\u65e0\u53c2\u6784\u9020\u65b9\u6cd5<\/span>\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-title function_\">MyWritable<\/span><span class=\"hljs-params\">()<\/span> {\r\n        \r\n    }\r\n    \r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">write<\/span><span class=\"hljs-params\">(DataOutput out)<\/span> <span class=\"hljs-keyword\">throws<\/span> IOException {\r\n        out.writeUTF(field1);\r\n        out.writeInt(field2);\r\n    }\r\n    \r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">readFields<\/span><span class=\"hljs-params\">(DataInput in)<\/span> <span class=\"hljs-keyword\">throws<\/span> IOException {\r\n        field1 = in.readUTF();\r\n        field2 = in.readInt();\r\n    }\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>MapReduce\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u3053\u306e\u30ab\u30b9\u30bf\u30e0\u306eWritable\u30af\u30e9\u30b9\u3092\u5165\u51fa\u529b\u306e\u30c7\u30fc\u30bf\u578b\u3068\u3057\u3066\u4f7f\u7528\u3057\u307e\u3059\u3002 Mapper\u3068Reducer\u3067\u3001write\u3068readFields\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3066\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u304a\u3088\u3073\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u64cd\u4f5c\u3092\u5b9f\u88c5\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">MyMapper<\/span> <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title class_\">Mapper<\/span>&lt;LongWritable, Text, Text, MyWritable&gt; {\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-type\">MyWritable<\/span> <span class=\"hljs-variable\">myWritable<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">MyWritable<\/span>();\r\n    \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\">(LongWritable key, Text value, Context context)<\/span> <span class=\"hljs-keyword\">throws<\/span> IOException, InterruptedException {\r\n        String[] parts = value.toString().split(<span class=\"hljs-string\">\",\"<\/span>);\r\n        \r\n        myWritable.setField1(parts[<span class=\"hljs-number\">0<\/span>]);\r\n        myWritable.setField2(Integer.parseInt(parts[<span class=\"hljs-number\">1<\/span>]));\r\n        \r\n        context.write(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Text<\/span>(<span class=\"hljs-string\">\"key\"<\/span>), myWritable);\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_\">MyReducer<\/span> <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title class_\">Reducer<\/span>&lt;Text, MyWritable, Text, NullWritable&gt; {\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;MyWritable&gt; values, Context context)<\/span> <span class=\"hljs-keyword\">throws<\/span> IOException, InterruptedException {\r\n        <span class=\"hljs-keyword\">for<\/span> (MyWritable value : values) {\r\n            <span class=\"hljs-comment\">\/\/ \u53cd\u5e8f\u5217\u5316\u64cd\u4f5c<\/span>\r\n            <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">field1<\/span> <span class=\"hljs-operator\">=<\/span> value.getField1();\r\n            <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">field2<\/span> <span class=\"hljs-operator\">=<\/span> value.getField2();\r\n            \r\n            <span class=\"hljs-comment\">\/\/ \u6267\u884c\u5176\u4ed6\u64cd\u4f5c<\/span>\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>Hadoop\u3067\u306f\u3001Writable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3068WritableComparable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3067\u3001\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u304a\u3088\u3073\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3092\u5b9f\u73fe\u3057\u3001MapReduce\u30d7\u30ed\u30b0\u30e9\u30e0\u5185\u3067\u30ab\u30b9\u30bf\u30e0\u30c7\u30fc\u30bf\u578b\u306e\u4fdd\u5b58\u3068\u51e6\u7406\u304c\u53ef\u80fd\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hadoop\u306e\u30b7\u30ea\u30a2\u30e9\u30a4\u30bc\u30fc\u30b7\u30e7\u30f3\u3068\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30bc\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u4e3b\u306bWritable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3068WritableComparable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u3088\u3063\u3066\u5b9f\u88c5\u3055\u308c\u307e\u3059\u3002Writable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306f\u3001\u30b7\u30ea\u30a2\u30e9\u30a4 [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-10682","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"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>Hadoop\u306e\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u3068\u30c7\u30b7\u30ea\u30a2\u30e9\u30a4\u30ba\u306f\u3069\u306e\u3088\u3046\u306b\u5b9f\u88c5\u3055\u308c\u308b\u306e\u304b\u3002 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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