{"id":10871,"date":"2022-09-25T06:45:01","date_gmt":"2022-09-25T01:15:01","guid":{"rendered":"http:\/\/jassweb.com\/solved\/solved-how-to-implement-string-matching-algorithm-with-hadoop\/"},"modified":"2022-09-25T06:45:01","modified_gmt":"2022-09-25T01:15:01","slug":"solved-how-to-implement-string-matching-algorithm-with-hadoop","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-to-implement-string-matching-algorithm-with-hadoop\/","title":{"rendered":"[Solved] How to implement string matching algorithm with Hadoop?"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-33686991\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"33686991\" data-parentid=\"33685079\" data-score=\"2\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>I haven&#8217;t tested the below code, But this should get you started.<br \/>\nI have used the BoyerMoore implementation available <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/algs4.cs.princeton.edu\/53substring\/BoyerMoore.java.html\">here<\/a><\/p>\n<p>What the below code is doing:<\/p>\n<p>The goal is to search for a pattern in an input document. The BoyerMoore class is initialized in the setup method using the pattern set in the configuration.<\/p>\n<p>The mapper receives each line at a time and it uses the BoyerMoore instance to find the pattern. If match is found, the we write it using context. <\/p>\n<p>There is no need of a reducer here. If the pattern is found multiple times in different mapper then the output will have multiple offsets(1 per mapper).<\/p>\n<pre><code>package hadoop.boyermoore;\n\nimport java.io.IOException;\nimport java.util.StringTokenizer;\n\nimport org.apache.hadoop.conf.Configuration;\nimport org.apache.hadoop.fs.Path;\nimport org.apache.hadoop.io.IntWritable;\nimport org.apache.hadoop.io.Text;\nimport org.apache.hadoop.mapreduce.Job;\nimport org.apache.hadoop.mapreduce.Mapper;\nimport org.apache.hadoop.mapreduce.Reducer;\nimport org.apache.hadoop.mapreduce.lib.input.FileInputFormat;\nimport org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;\n\npublic class BoyerMooreImpl {\n\n\n      public static class TokenizerMapper\n           extends Mapper&lt;Object, Text, Text, IntWritable&gt;{\n        private BoyerMoore boyerMoore;\n        private static IntWritable offset;\n        private Text offsetFound = new Text(\"offset\");\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              String line = itr.nextToken();\n              int offset1 = boyerMoore.search(line);\n              if (line.length() != offset1) {\n                  offset = new IntWritable(offset1);\n                  context.write(offsetFound,offset);\n              }\n          }\n        }\n        @Override\n        public final void setup(Context context) {\n            if (boyerMoore == null)\n                boyerMoore = new BoyerMoore(context.getConfiguration().get(\"pattern\"));\n        }\n      }\n\n\n      public static void main(String[] args) throws Exception {\n        Configuration conf = new Configuration();\n        conf.set(\"pattern\",\"your_pattern_here\");\n        Job job = Job.getInstance(conf, \"BoyerMoore\");\n        job.setJarByClass(BoyerMooreImpl.class);\n        job.setMapperClass(TokenizerMapper.class);\n        job.setOutputKeyClass(Text.class);\n        job.setOutputValueClass(IntWritable.class);\n        FileInputFormat.addInputPath(job, new Path(args[0]));\n        FileOutputFormat.setOutputPath(job, new Path(args[1]));\n        System.exit(job.waitForCompletion(true) ? 0 : 1);\n      }\n}\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">0<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved How to implement string matching algorithm with Hadoop? <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] I haven&#8217;t tested the below code, But this should get you started. I have used the BoyerMoore implementation available here What the below code is doing: The goal is to search for a pattern in an input document. The BoyerMoore class is initialized in the setup method using the pattern set in the configuration. &#8230; <a title=\"[Solved] How to implement string matching algorithm with Hadoop?\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-implement-string-matching-algorithm-with-hadoop\/\" aria-label=\"More on [Solved] How to implement string matching algorithm with Hadoop?\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[2985,1001,323,429],"class_list":["post-10871","post","type-post","status-publish","format-standard","hentry","category-solved","tag-boyer-moore","tag-hadoop","tag-java","tag-string-matching"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] How to implement string matching algorithm with Hadoop? - JassWeb<\/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:\/\/jassweb.com\/solved\/solved-how-to-implement-string-matching-algorithm-with-hadoop\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] How to implement string matching algorithm with Hadoop? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] I haven&#8217;t tested the below code, But this should get you started. 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