{"id":115972,"date":"2024-03-23T04:51:50","date_gmt":"2024-03-22T19:51:50","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/scala%e3%81%a7hdfs%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%80%e6%96%b9%e6%b3%95\/"},"modified":"2024-03-28T13:25:14","modified_gmt":"2024-03-28T04:25:14","slug":"scala%e3%81%a7hdfs%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%80%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/scala%e3%81%a7hdfs%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%80%e6%96%b9%e6%b3%95\/","title":{"rendered":"Scala\u3067HDFS\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u65b9\u6cd5"},"content":{"rendered":"

HDFS\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u306b\u306f\u3001Scala\u3067\u306fHadoop\u306eHDFS\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u7c21\u5358\u306a\u4f8b\u306f\u3001HDFS\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3093\u3067\u5370\u5237\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

“`scala
\nimport org.apache.hadoop.conf.Configuration
\nimport org.apache.hadoop.fs.{FileSystem, Path}<\/p>\n

object HdfsFileReader {
\ndef main(args: Array[String]): Unit = {
\nval conf = new Configuration()
\nval fs = FileSystem.get(conf)
\nval filePath = new Path(“hdfs:\/\/localhost:9000\/path\/to\/your\/file.txt”)<\/p>\n

val inputStream = fs.open(filePath)
\nval buffer = new Array[Byte](1024)<\/p>\n

var bytesRead = inputStream.read(buffer)
\nwhile (bytesRead > 0) {
\nprintln(new String(buffer, 0, bytesRead))
\nbytesRead = inputStream.read(buffer)
\n}<\/p>\n

inputStream.close()
\nfs.close()
\n}
\n}
\n“`<\/p>\n

\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001\u307e\u305a`Configuration`\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u3001`FileSystem.get(conf)`\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066HDFS\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u305f\u3081\u306e`FileSystem`\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002\u6b21\u306b\u3001`new Path(“hdfs:\/\/localhost:9000\/path\/to\/your\/file.txt”)`\u3092\u4f7f\u7528\u3057\u3066HDFS\u30d5\u30a1\u30a4\u30eb\u30d1\u30b9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u6b21\u306b\u3001`fs.open(filePath)`\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u5165\u529b\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u958b\u304d\u3001\u30d0\u30a4\u30c8\u914d\u5217\u30d0\u30c3\u30d5\u30a1\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u6b21\u306b\u3001`inputStream.read(buffer)`\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u306e\u5185\u5bb9\u3092\u30d0\u30c3\u30d5\u30a1\u306b\u8aad\u307f\u8fbc\u307f\u3001`new String(buffer, 0, bytesRead)`\u3092\u4f7f\u7528\u3057\u3066\u30d0\u30a4\u30c8\u914d\u5217\u3092\u6587\u5b57\u5217\u306b\u5909\u63db\u3057\u3066\u5370\u5237\u3057\u307e\u3059\u3002\u6700\u5f8c\u306b\u3001\u5165\u529b\u30b9\u30c8\u30ea\u30fc\u30e0\u3068\u30d5\u30a1\u30a4\u30eb\u30b7\u30b9\u30c6\u30e0\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4f7f\u7528\u304c\u7d42\u4e86\u3057\u305f\u3089\u3001`close()`\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\u3066\u305d\u308c\u3089\u3092\u9589\u3058\u307e\u3059\u3002\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001HDFS\u63a5\u7d9aURL\u304c`hdfs:\/\/localhost:9000`\u3067\u3001\u8aad\u307f\u8fbc\u307e\u308c\u308b\u30d5\u30a1\u30a4\u30eb\u30d1\u30b9\u304c`\/path\/to\/your\/file.txt`\u3067\u3042\u308b\u3068\u60f3\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u5b9f\u969b\u306e\u72b6\u6cc1\u306b\u5fdc\u3058\u3066\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u4fee\u6b63\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

HDFS\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u306b\u306f\u3001Scala\u3067\u306fHadoop\u306eHDFS\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u7c21\u5358\u306a\u4f8b\u306f\u3001HDFS\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3093\u3067\u5370\u5237\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002 “`scala import […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-115972","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nScala\u3067HDFS\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u65b9\u6cd5 - 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\/scala\u3067hdfs\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u65b9\u6cd5\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Scala\u3067HDFS\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u65b9\u6cd5\" \/>\n<meta property=\"og:description\" content=\"HDFS\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u306b\u306f\u3001Scala\u3067\u306fHadoop\u306eHDFS\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u7c21\u5358\u306a\u4f8b\u306f\u3001HDFS\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3093\u3067\u5370\u5237\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002 “`scala import […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/scala\u3067hdfs\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u65b9\u6cd5\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-22T19:51:50+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-28T04:25:14+00:00\" \/>\n<meta name=\"author\" content=\"\u7dbe\u4e43, \u4e00\u5e0c\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u7dbe\u4e43, \u4e00\u5e0c\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593\" \/>\n\t<meta name=\"twitter:data2\" content=\"1\u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/scala%e3%81%a7hdfs%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%80%e6%96%b9%e6%b3%95\/\",\"url\":\"https:\/\/www.silicloud.com\/ja\/blog\/scala%e3%81%a7hdfs%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%80%e6%96%b9%e6%b3%95\/\",\"name\":\"Scala\u3067HDFS\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u65b9\u6cd5 - Blog - Silicon Cloud\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/#website\"},\"datePublished\":\"2024-03-22T19:51:50+00:00\",\"dateModified\":\"2024-03-28T04:25:14+00:00\",\"author\":{\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/#\/schema\/person\/601389077b7f4e4ad6115428e3b73bff\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/scala%e3%81%a7hdfs%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%80%e6%96%b9%e6%b3%95\/#breadcrumb\"},\"inLanguage\":\"ja\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.silicloud.com\/ja\/blog\/scala%e3%81%a7hdfs%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%80%e6%96%b9%e6%b3%95\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/scala%e3%81%a7hdfs%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%80%e6%96%b9%e6%b3%95\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.silicloud.com\/ja\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Scala\u3067HDFS\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u65b9\u6cd5\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/#website\",\"url\":\"https:\/\/www.silicloud.com\/ja\/blog\/\",\"name\":\"Blog - Silicon Cloud\",\"description\":\"\",\"inLanguage\":\"ja\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/#\/schema\/person\/601389077b7f4e4ad6115428e3b73bff\",\"name\":\"\u7dbe\u4e43, \u4e00\u5e0c\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"ja\",\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/2228fe98b71141214fb24fb1b5ae44f99bdfa0602bbd89b351f2acd49ece862d?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/2228fe98b71141214fb24fb1b5ae44f99bdfa0602bbd89b351f2acd49ece862d?s=96&d=mm&r=g\",\"caption\":\"\u7dbe\u4e43, \u4e00\u5e0c\"},\"url\":\"https:\/\/www.silicloud.com\/ja\/blog\/author\/ayanokazuki\/\"},{\"@type\":\"ImageObject\",\"inLanguage\":\"ja\",\"@id\":\"https:\/\/www.silicloud.com\/ja\/blog\/scala%e3%81%a7hdfs%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%80%e6%96%b9%e6%b3%95\/#local-main-organization-logo\",\"url\":\"\",\"contentUrl\":\"\",\"caption\":\"Blog - Silicon Cloud\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Scala\u3067HDFS\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u65b9\u6cd5 - Blog - Silicon Cloud","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.silicloud.com\/ja\/blog\/scala\u3067hdfs\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u65b9\u6cd5\/","og_locale":"ja_JP","og_type":"article","og_title":"Scala\u3067HDFS\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u65b9\u6cd5","og_description":"HDFS\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u306b\u306f\u3001Scala\u3067\u306fHadoop\u306eHDFS\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u7c21\u5358\u306a\u4f8b\u306f\u3001HDFS\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3093\u3067\u5370\u5237\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002 “`scala import […]","og_url":"https:\/\/www.silicloud.com\/ja\/blog\/scala\u3067hdfs\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u65b9\u6cd5\/","og_site_name":"Blog - Silicon Cloud","article_published_time":"2024-03-22T19:51:50+00:00","article_modified_time":"2024-03-28T04:25:14+00:00","author":"\u7dbe\u4e43, \u4e00\u5e0c","twitter_card":"summary_large_image","twitter_misc":{"\u57f7\u7b46\u8005":"\u7dbe\u4e43, \u4e00\u5e0c","\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593":"1\u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.silicloud.com\/ja\/blog\/scala%e3%81%a7hdfs%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%80%e6%96%b9%e6%b3%95\/","url":"https:\/\/www.silicloud.com\/ja\/blog\/scala%e3%81%a7hdfs%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%80%e6%96%b9%e6%b3%95\/","name":"Scala\u3067HDFS\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u65b9\u6cd5 - Blog - Silicon Cloud","isPartOf":{"@id":"https:\/\/www.silicloud.com\/ja\/blog\/#website"},"datePublished":"2024-03-22T19:51:50+00:00","dateModified":"2024-03-28T04:25:14+00:00","author":{"@id":"https:\/\/www.silicloud.com\/ja\/blog\/#\/schema\/person\/601389077b7f4e4ad6115428e3b73bff"},"breadcrumb":{"@id":"https:\/\/www.silicloud.com\/ja\/blog\/scala%e3%81%a7hdfs%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%80%e6%96%b9%e6%b3%95\/#breadcrumb"},"inLanguage":"ja","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.silicloud.com\/ja\/blog\/scala%e3%81%a7hdfs%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%80%e6%96%b9%e6%b3%95\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.silicloud.com\/ja\/blog\/scala%e3%81%a7hdfs%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%80%e6%96%b9%e6%b3%95\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.silicloud.com\/ja\/blog\/"},{"@type":"ListItem","position":2,"name":"Scala\u3067HDFS\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u65b9\u6cd5"}]},{"@type":"WebSite","@id":"https:\/\/www.silicloud.com\/ja\/blog\/#website","url":"https:\/\/www.silicloud.com\/ja\/blog\/","name":"Blog - Silicon Cloud","description":"","inLanguage":"ja"},{"@type":"Person","@id":"https:\/\/www.silicloud.com\/ja\/blog\/#\/schema\/person\/601389077b7f4e4ad6115428e3b73bff","name":"\u7dbe\u4e43, \u4e00\u5e0c","image":{"@type":"ImageObject","inLanguage":"ja","@id":"https:\/\/www.silicloud.com\/ja\/blog\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/2228fe98b71141214fb24fb1b5ae44f99bdfa0602bbd89b351f2acd49ece862d?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/2228fe98b71141214fb24fb1b5ae44f99bdfa0602bbd89b351f2acd49ece862d?s=96&d=mm&r=g","caption":"\u7dbe\u4e43, \u4e00\u5e0c"},"url":"https:\/\/www.silicloud.com\/ja\/blog\/author\/ayanokazuki\/"},{"@type":"ImageObject","inLanguage":"ja","@id":"https:\/\/www.silicloud.com\/ja\/blog\/scala%e3%81%a7hdfs%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e8%aa%ad%e3%81%bf%e8%be%bc%e3%82%80%e6%96%b9%e6%b3%95\/#local-main-organization-logo","url":"","contentUrl":"","caption":"Blog - Silicon Cloud"}]}},"_links":{"self":[{"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/posts\/115972","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/comments?post=115972"}],"version-history":[{"count":2,"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/posts\/115972\/revisions"}],"predecessor-version":[{"id":205950,"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/posts\/115972\/revisions\/205950"}],"wp:attachment":[{"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/media?parent=115972"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/categories?post=115972"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.silicloud.com\/ja\/blog\/wp-json\/wp\/v2\/tags?post=115972"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}