What the class GenericMRLoadGenerator.java does?

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Hi

I am trying to understand what the 
|/src/test/org/apache/hadoop/mapred/GenericMRLoadGenerator.java| does. I 
have noticed that the map and reduce functions uses this method, but I 
don’t understand what it does. What is the purpose of this class? What 
this method is doing?

|
     protected void emit(K key, V val, OutputCollector<K,V> out)
         throws IOException {
       ++total;
       while((float) kept / total < keep) {
         ++kept;
         out.collect(key, val);
       }
     }
   }
|

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