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    <p>Here it's the classic WordCount example. You'll notice a tone of other imports that may not be necessary, reading the code you'll figure out which is which. </p> <p>What's different? I'm using the Tool interface and the GenericOptionParser to parse the job command a.k.a : hadoop jar ....</p> <p>In the mapper you'll notice a run thing. You can get rid of that, it's usually called by default when you supply the code for the Map method. I put it there to give you the info that you can further control the mapping stage. This is all using the new API. I hope you find it useful. Any other questions, let me know!</p> <pre><code>import java.io.IOException; import java.util.*; import org.apache.commons.io.FileUtils; import org.apache.hadoop.conf.*; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.*; import org.apache.hadoop.mapreduce.Job; import org.apache.hadoop.mapreduce.Mapper; import org.apache.hadoop.mapreduce.Reducer; import org.apache.hadoop.mapreduce.lib.input.FileInputFormat; import org.apache.hadoop.mapreduce.lib.input.TextInputFormat; import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat; import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat; import org.apache.hadoop.util.Tool; import org.apache.hadoop.util.ToolRunner; import org.apache.hadoop.util.GenericOptionsParser; public class Inception extends Configured implements Tool{ public static class Map extends Mapper&lt;LongWritable, Text, Text, IntWritable&gt; { private final static IntWritable one = new IntWritable(1); private Text word = new Text(); public void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException { String line = value.toString(); StringTokenizer tokenizer = new StringTokenizer(line); while (tokenizer.hasMoreTokens()) { word.set(tokenizer.nextToken()); context.write(word, one); } } public void run (Context context) throws IOException, InterruptedException { setup(context); while (context.nextKeyValue()) { map(context.getCurrentKey(), context.getCurrentValue(), context); } cleanup(context); } } public static class Reduce extends Reducer&lt;Text, IntWritable, Text, IntWritable&gt; { public void reduce(Text key, Iterable&lt;IntWritable&gt; values, Context context) throws IOException, InterruptedException { int sum = 0; for (IntWritable val : values) { sum += val.get(); } context.write(key, new IntWritable(sum)); } } public int run(String[] args) throws Exception { Job job = Job.getInstance(new Configuration()); job.setOutputKeyClass(Text.class); job.setOutputValueClass(IntWritable.class); job.setMapperClass(Map.class); job.setReducerClass(Reduce.class); job.setInputFormatClass(TextInputFormat.class); job.setOutputFormatClass(TextOutputFormat.class); FileInputFormat.setInputPaths(job, new Path(args[0])); FileOutputFormat.setOutputPath(job, new Path(args[1])); job.setJarByClass(WordCount.class); job.submit(); return 0; } public static void main(String[] args) throws Exception { Configuration conf = new Configuration(); String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs(); ToolRunner.run(new WordCount(), otherArgs); } } </code></pre>
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    1. USDan Ciborowski - MSFT
    1. USinquire
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    1. COthnx for quick response dude. I'll try it and then accept your answer.
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    2. COI might have forgotten some closing brackets. Any build errors you get when jaring the things should be straightforward to solve anyway!
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    3. COYes...Will solve it and reply back. ;-)
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