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Why there is only one reducer when doing 1TB tera sort?

Question asked by xxqonline on Jul 16, 2011
Latest reply on Jul 18, 2011 by amit
Hello guys:
      I have setup a 6 nodes hosts with MapR, I want to see is it really 3 times fater than hadoop.
    But when I run the  1TB tera sort. THere is only one reducer.So it tasks me a whole day to complete my job.
    I am using redhat 5 , and each node with an additional 7200 900GB disk.
    I got the rpms from
   Do you test tera sort, which part MapR is 3 times faster than hadoop?