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Andriamahatratra.Mandresy: /* Pré-requis et installation */

2019-12-08T17:15:43Z

Pré-requis et installation

← Older revision		Revision as of 17:15, 8 December 2019
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	=Pré-requis et installation=		=Pré-requis et installation=
			* Hadoop
			* JAVA

	=Code=		=Code=

Andriamahatratra.Mandresy: /* Code */

2019-12-08T17:14:37Z

Code

@@ Line 2: / Line 2: @@
 =Code=
-import java.io.IOException;
+ aimport java.io.IOException;
 import java.util.*;
@@ Line 15: / Line 15: @@
  public class WordCount {
       private final static IntWritable one = new IntWritable(1);
       private Text word = new Text();
@@ Line 56: / Line 29: @@
+    }
       public void reduce(Text key, Iterator<IntWritable> values, OutputCollector<Text, IntWritable> output, Reporter reporter) throws IOException {
         int sum = 0;
@@ Line 71: / Line 39: @@
+    }
 </syntaxhighlight>

Andriamahatratra.Mandresy: /* Code */

2019-12-08T17:12:33Z

Code

@@ Line 3: / Line 3: @@
 =Code=
 <syntaxhighlight  lang="java" >
 import java.io.IOException;
 import java.util.*;
@@ Line 15: / Line 15: @@
  public class WordCount {
       private final static IntWritable one = new IntWritable(1);
       private Text word = new Text();
@@ Line 29: / Line 56: @@
+    }
       public void reduce(Text key, Iterator<IntWritable> values, OutputCollector<Text, IntWritable> output, Reporter reporter) throws IOException {
         int sum = 0;
@@ Line 39: / Line 71: @@
+    }
 </syntaxhighlight>

Andriamahatratra.Mandresy: Created page with "=Pré-requis et installation= =Code= { import java.io.IOException; import java.util.*; import org.apache.hadoop.fs.Path; import org.apache.ha..."

2019-12-08T17:09:31Z

Created page with "=Pré-requis et installation= =Code= <syntaxhighlight lang="java" > { import java.io.IOException; import java.util.*; import org.apache.hadoop.fs.Path; import org.apache.ha..."

New page

=Pré-requis et installation=

=Code=
<syntaxhighlight lang="java" >
{
import java.io.IOException;
import java.util.*;

import org.apache.hadoop.fs.Path;
import org.apache.hadoop.conf.*;
import org.apache.hadoop.io.*;
import org.apache.hadoop.mapred.*;
import org.apache.hadoop.util.*;

public class WordCount {

public static class Map extends MapReduceBase implements Mapper<LongWritable, Text, Text, IntWritable> {
private final static IntWritable one = new IntWritable(1);
private Text word = new Text();

public void map(LongWritable key, Text value, OutputCollector<Text, IntWritable> output, Reporter reporter) throws IOException {
String line = value.toString();
StringTokenizer tokenizer = new StringTokenizer(line);
while (tokenizer.hasMoreTokens()) {
word.set(tokenizer.nextToken());
output.collect(word, one);
}
}
}

public static class Reduce extends MapReduceBase implements Reducer<Text, IntWritable, Text, IntWritable> {
public void reduce(Text key, Iterator<IntWritable> values, OutputCollector<Text, IntWritable> output, Reporter reporter) throws IOException {
int sum = 0;
while (values.hasNext()) {
sum += values.next().get();
}
output.collect(key, new IntWritable(sum));
}
}

public static void main(String[] args) throws Exception {
JobConf conf = new JobConf(WordCount.class);
conf.setJobName("wordcount");

conf.setOutputKeyClass(Text.class);
conf.setOutputValueClass(IntWritable.class);

conf.setMapperClass(Map.class);
conf.setCombinerClass(Reduce.class);
conf.setReducerClass(Reduce.class);

conf.setInputFormat(TextInputFormat.class);
conf.setOutputFormat(TextOutputFormat.class);

FileInputFormat.setInputPaths(conf, new Path(args[0]));
FileOutputFormat.setOutputPath(conf, new Path(args[1]));

JobClient.runJob(conf);
}
}
}
</syntaxhighlight>