Find reversed names on a file with hadoop mapreduce - hadoop

Question

Hello I have this file http://aminer.org/lab-datasets/citation/citation-network1.zip and I need to find the names of the authors that have publications with just 2 authors and they reverse their names on at least one of them.
The mapper I made is this one :
package bigdatauom;
import java.io.IOException;
import java.util.ArrayList;
import java.util.StringTokenizer;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Mapper;
public class TokenizerMapper
extends Mapper<Object, Text, Text, IntWritable> {
private final static IntWritable one = new IntWritable(1);
private Text keyAuthors = new Text();
public void map(Object key, Text value, Context context
) throws IOException, InterruptedException {
StringTokenizer authorslinetok = new StringTokenizer(value.toString(), "#");
while (authorslinetok.hasMoreTokens()) {
String tempLine = authorslinetok.nextToken();
if (tempLine.charAt(0) == '#') {
tempLine = tempLine.substring(1);
StringTokenizer seperateAuthorsTok = new StringTokenizer(tempLine, ",");
ArrayList<String> authors = new ArrayList<String>();
while (seperateAuthorsTok.hasMoreTokens()) {
authors.add(seperateAuthorsTok.nextToken());
}
if (authors.size() == 2){
keyAuthors.set(tempLine);
context.write(keyAuthors, one);
}
}
}
}
}
I need to have 2 instances of the reducer and have been working on this project for one week with no result.
Any advice is appreciated thanks in advance!