title: Setting the number of map tasks and reduce tasks
body: <p>I am currently running a job I fixed the number of map task to 20 but and getting a higher number. I also set the reduce task to zero but I am still getting a number other than zero. The total time for the MapReduce job to complete is also not display. Can someone tell me what I am doing wrong.
  I am using this command</p>
  
  <pre><code>hadoop jar Test_Parallel_for.jar Test_Parallel_for Matrix/test4.txt Result 3 \ -D mapred.map.tasks = 20 \ -D mapred.reduce.tasks =0
  </code></pre>
  
  <p>Output:</p>
  
  <pre><code>11/07/30 19:48:56 INFO mapred.JobClient: Job complete: job_201107291018_0164
  11/07/30 19:48:56 INFO mapred.JobClient: Counters: 18
  11/07/30 19:48:56 INFO mapred.JobClient:   Job Counters 
  11/07/30 19:48:56 INFO mapred.JobClient:     Launched reduce tasks=13
  11/07/30 19:48:56 INFO mapred.JobClient:     Rack-local map tasks=12
  11/07/30 19:48:56 INFO mapred.JobClient:     Launched map tasks=24
  11/07/30 19:48:56 INFO mapred.JobClient:     Data-local map tasks=12
  11/07/30 19:48:56 INFO mapred.JobClient:   FileSystemCounters
  11/07/30 19:48:56 INFO mapred.JobClient:     FILE_BYTES_READ=4020792636
  11/07/30 19:48:56 INFO mapred.JobClient:     HDFS_BYTES_READ=1556534680
  11/07/30 19:48:56 INFO mapred.JobClient:     FILE_BYTES_WRITTEN=6026699058
  11/07/30 19:48:56 INFO mapred.JobClient:     HDFS_BYTES_WRITTEN=1928893942
  11/07/30 19:48:56 INFO mapred.JobClient:   Map-Reduce Framework
  11/07/30 19:48:56 INFO mapred.JobClient:     Reduce input groups=40000000
  11/07/30 19:48:56 INFO mapred.JobClient:     Combine output records=0
  11/07/30 19:48:56 INFO mapred.JobClient:     Map input records=40000000
  11/07/30 19:48:56 INFO mapred.JobClient:     Reduce shuffle bytes=1974162269
  11/07/30 19:48:56 INFO mapred.JobClient:     Reduce output records=40000000
  11/07/30 19:48:56 INFO mapred.JobClient:     Spilled Records=120000000
  11/07/30 19:48:56 INFO mapred.JobClient:     Map output bytes=1928893942
  11/07/30 19:48:56 INFO mapred.JobClient:     Combine input records=0
  11/07/30 19:48:56 INFO mapred.JobClient:     Map output records=40000000
  11/07/30 19:48:56 INFO mapred.JobClient:     Reduce input records=40000000
  [hcrc1425n30]s0907855: 
  </code></pre>