public class TraitementMapper
    extends Mapper<LongWritable, Text, Text, IntArrayWritable>
{
  public void map(LongWritable key, Text value, Context context)
     throws IOException, InterruptedException
  {
     Text cle = new Text("ok");
     IntArrayWritable valeur = new IntArrayWritable(2);
     valeur.itemAt(0).set(123);
     valeur.itemAt(1).set(value.getLength());
     context.write(cle, valeur);
  }
}