Changes between Initial Version and Version 1 of waue/wordCountI


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Timestamp:
Dec 17, 2011, 12:38:44 PM (13 years ago)
Author:
waue
Comment:

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  • waue/wordCountI

    v1 v1  
     1
     2{{{
     3#!java
     4import java.io.IOException;
     5import java.util.StringTokenizer;
     6
     7import org.apache.hadoop.conf.Configuration;
     8import org.apache.hadoop.fs.Path;
     9import org.apache.hadoop.io.IntWritable;
     10import org.apache.hadoop.io.Text;
     11import org.apache.hadoop.mapreduce.Job;
     12import org.apache.hadoop.mapreduce.Mapper;
     13import org.apache.hadoop.mapreduce.Reducer;
     14import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
     15import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
     16import org.apache.hadoop.util.GenericOptionsParser;
     17
     18public class WordCount {
     19
     20  public static class TokenizerMapper extends
     21      Mapper<Object, Text, Text, IntWritable> {
     22
     23    private final static IntWritable one = new IntWritable(1);
     24    private Text word = new Text();
     25
     26    public void map(Object key, Text value, Context context)
     27        throws IOException, InterruptedException {
     28      StringTokenizer itr = new StringTokenizer(value.toString());
     29      while (itr.hasMoreTokens()) {
     30        word.set(itr.nextToken());
     31        context.write(word, one);
     32      }
     33    }
     34  }
     35
     36  public static class IntSumReducer extends
     37      Reducer<Text, IntWritable, Text, IntWritable> {
     38    private IntWritable result = new IntWritable();
     39
     40    public void reduce(Text key, Iterable<IntWritable> values,
     41        Context context) throws IOException, InterruptedException {
     42      int sum = 0;
     43      for (IntWritable val : values) {
     44        sum += val.get();
     45      }
     46      result.set(sum);
     47      context.write(key, result);
     48    }
     49  }
     50
     51  public static void main(String[] args) throws Exception {
     52    // eclipse using
     53//    String[] argv = { "/user/hadoop/input", "/user/hadoop/output-wc" };
     54//    args = argv;
     55   
     56    Configuration conf = new Configuration();
     57   
     58    String[] otherArgs = new GenericOptionsParser(conf, args)
     59        .getRemainingArgs();
     60    if (otherArgs.length != 2) {
     61      System.err
     62          .println("Usage: hadoop jar WordCount.jar <input> <output>");
     63      System.exit(2);
     64    }
     65
     66    Job job = new Job(conf, "Word Count");
     67    job.setJarByClass(WordCount.class);
     68    job.setMapperClass(TokenizerMapper.class);
     69    job.setCombinerClass(IntSumReducer.class);
     70    job.setReducerClass(IntSumReducer.class);
     71    job.setOutputKeyClass(Text.class);
     72    job.setOutputValueClass(IntWritable.class);
     73    FileInputFormat.addInputPath(job, new Path(args[0]));
     74    FileOutputFormat.setOutputPath(job, new Path(args[1]));
     75    CheckAndDelete.checkAndDelete(args[1], conf);
     76    System.exit(job.waitForCompletion(true) ? 0 : 1);
     77  }
     78}
     79
     80
     81}}}