Commit 2c7f1c6a authored by YUSHIQIAN's avatar YUSHIQIAN

base

parent 291bba17
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package fr.eurecom.dsg.mapreduce;
/**
* Hello world!
*
*/
public class App
{
public static void main( String[] args )
{
System.out.println( "Hello World!" );
}
}
package fr.eurecom.dsg.mapreduce;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
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;
public class WordCount extends Configured implements Tool {
static class WCMapper extends Mapper<LongWritable, Text, Text, IntWritable> {
private IntWritable ONE = new IntWritable(1);
private Text textValue = new Text();
@Override
protected void map(LongWritable key, Text value, Context context)
throws IOException, InterruptedException {
String line = value.toString();
String[] words = line.split("\\s+");
for(String word : words) {
textValue.set(word);
context.write(textValue, ONE);}
}
}
static class WCReducer extends Reducer<Text, IntWritable, Text, IntWritable> {
private IntWritable writableSum = new IntWritable();
@Override
protected void reduce(Text key, Iterable<IntWritable> values, Context context)
throws IOException, InterruptedException {
int sum = 0;
for (IntWritable value : values)
sum += value.get();
writableSum.set(sum);
context.write(key,writableSum);
}
}
@Override
public int run(String[] args) throws Exception {
Configuration conf = this.getConf();
Job job = new Job(conf,"Word Count");
job.setInputFormatClass(TextInputFormat.class);
job.setMapperClass(WCMapper.class);
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(IntWritable.class);
job.setReducerClass(WCReducer.class);
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(IntWritable.class);
job.setOutputFormatClass(TextOutputFormat.class);
FileInputFormat.addInputPath(job, new Path(args[1]));
FileOutputFormat.setOutputPath(job, new Path(args[2]));
job.setNumReduceTasks(Integer.parseInt(args[0]));
job.setJarByClass(WordCount.class);
job.waitForCompletion(true);
return 0;
}
public static void main(String args[]) throws Exception {
ToolRunner.run(new Configuration(), new WordCount(), args);
}
}
......@@ -5,9 +5,9 @@ import junit.framework.TestCase;
import junit.framework.TestSuite;
/**
* Unit test for simple App.
* Unit test for simple WordCount.
*/
public class AppTest
public class WordCountTest
extends TestCase
{
/**
......@@ -15,7 +15,7 @@ public class AppTest
*
* @param testName name of the test case
*/
public AppTest( String testName )
public WordCountTest(String testName)
{
super( testName );
}
......@@ -25,7 +25,7 @@ public class AppTest
*/
public static Test suite()
{
return new TestSuite( AppTest.class );
return new TestSuite( WordCountTest.class );
}
/**
......
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