Converting MapWritable to a string in Hadoop - hadoop

Question

When I run my output with the toString() method I am getting:
#zombie org.apache.hadoop.io.MapWritable#b779f586
#zombies org.apache.hadoop.io.MapWritable#c8008ef9
#zona org.apache.hadoop.io.MapWritable#99e061a1
#zoology org.apache.hadoop.io.MapWritable#9d0060be
#zzp org.apache.hadoop.io.MapWritable#3e52c108
Here is my reducer code, how can I get the map values to print out instead?
package sample;
import java.io.IOException;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.MapWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapreduce.Reducer;
public class IntSumReducer
extends Reducer<Text,MapWritable,Text,MapWritable> {
private MapWritable result = new MapWritable();
String temp = "";
public void reduce(Text key, Iterable<MapWritable> values, Context context)throws IOException, InterruptedException {
result.clear();
for (MapWritable val : values) {
Iterable<Writable> keys = val.keySet();
for (Writable k : keys) {
IntWritable tally = (IntWritable) val.get(k);
if (result.containsKey(k)) {
IntWritable tallies = (IntWritable) result.get(k);
tallies.set(tallies.get() + tally.get());
temp = toString() + " : " + tallies.get();
result.put(new Text(temp), tallies);
} else {
temp = k.toString() + " : " + tally.get();
result.put(new Text(temp), tally);
}
}
}
context.write(key, result);
}
}
Thanks for the help

Answer 1

Adding a class like this should work:
class MyMapWritable extends MapWritable {
#Override
public String toString() {
StringBuilder result = new StringBuilder();
Set<Writable> keySet = this.keySet();
for (Object key : keySet) {
result.append("{" + key.toString() + " = " + this.get(key) + "}");
}
return result.toString();
}
}
Then call it like so:
MyMapWritable mw = new MyMapWritable();
mw.toString();

Answer 2

Your result is a MapWritable, and the toString() method is not overridden in MapWritable.
You can create new class that extends MapWritable and create your own toString() method in it.
Change your code after that to :
public class IntSumReducer extends Reducer<Text,MapWritable,Text,YourMapWritable> {
private YourMapWritable result = new YourMapWritable();
String temp = "";
...