/
AuthorCounter.java
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/
AuthorCounter.java
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import java.io.IOException;
import org.apache.hadoop.mapreduce.*;
import org.apache.hadoop.fs.*;
import org.apache.hadoop.io.*;
import org.apache.hadoop.conf.*;
import org.apache.hadoop.mapreduce.lib.input.*;
import org.apache.hadoop.mapreduce.lib.output.*;
import org.apache.hadoop.mapreduce.lib.map.*;
import org.apache.hadoop.util.*;
import java.util.Random;
public class AuthorCounter extends Configured implements Tool {
private String inputPath;
public void setTheInputPath(String path)
{
inputPath = path;
}
public static class TokenizerMapper
extends Mapper<Object, Text, Text, LongWritable>{
private final static LongWritable one = new LongWritable(1);
private Text word = new Text();
public void map(Object key, Text value, Context context
) throws IOException, InterruptedException {
String file = value.toString();
String [] lines = file.split("\n");
for(String line : lines)
{
if(line.contains("<author>") && line.contains("</author>"))
{
String author = line.substring(8, line.indexOf("</a"));
word.set(author);
context.write(word, one);
}
else if(line.contains("<author>"))
{
String author = line.substring(8);
word.set(author);
context.write(word, one);
}
}
}
}
public static class IntSumReducer
extends Reducer<Text,LongWritable,Text,LongWritable> {
private LongWritable result = new LongWritable();
public void reduce(Text key, Iterable<LongWritable> values,
Context context
) throws IOException, InterruptedException {
int sum = 0;
for (LongWritable val : values) {
sum += val.get();
}
result.set(sum);
context.write(key, result);
}
}
public int run(String [] args) throws Exception{
Path tempDir =
new Path("/user/akhfa/temp");
Configuration conf = new Configuration();
Job job = Job.getInstance(conf, "word count");
job.setJarByClass(AuthorCounter.class);
job.setMapperClass(TokenizerMapper.class);
job.setCombinerClass(IntSumReducer.class);
job.setReducerClass(IntSumReducer.class);
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(LongWritable.class);
job.setOutputFormatClass(SequenceFileOutputFormat.class);
FileInputFormat.addInputPath(job, new Path(args[0]));
FileOutputFormat.setOutputPath(job, tempDir);
System.exit(job.waitForCompletion(true) ? 0 : 1);
return 0;
}
public static void main(String[] args) throws Exception {
int res = ToolRunner.run(new Configuration(), new AuthorCounter(), args);
}
}