title: number of map output records less than combine input records in hadoop
body: <p>When I run a mapreduce I am getting combine input records greater than map output records? This is really strange. I could not figure out exactly whats happening? As far as I know map output records should be exaclty same ad combine input records. Could anyone please help me figure out the problem. Thanks in advance.</p>
  
  <p>Here is a real world job example:</p>
  
  <pre><code>    Map-Reduce Framework
        Map input records=112705844
        Map output records=64841776
        Combine input records=64842079
        Combine output records=409
        Reduce input records=106
        Reduce output records=4
  </code></pre>