Gera Shegalov created MAPREDUCE-6793:

             Summary: io.sort.factor code default and mapred-default.xml values 
                 Key: MAPREDUCE-6793
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: task
    Affects Versions: 3.0.0-alpha1, 2.6.5
            Reporter: Gera Shegalov
            Priority: Trivial

The actual default value in mapred-default.xml:
  <description>The number of streams to merge at once while sorting
  files.  This determines the number of open file handles.</description>

However, MapTask and MergeManagerImpl, are coded with:
 int mergeFactor = job.getInt(JobContext.IO_SORT_FACTOR, 100);

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