Computation of number of reducers in order by has to change for a static 
cluster (Hadoop 20)

                 Key: PIG-702
             Project: Pig
          Issue Type: Bug
          Components: impl
    Affects Versions: types_branch
            Reporter: Santhosh Srinivasan
             Fix For: types_branch

In Hadoop 20, a static cluster is shared amongst multiple queues. The 
computation of the number of reducers in order by queries when parallel keyword 
needs to change. Currently, the number of reducers is computed as a function of 
the number of reduce slots and the number of nodes in the cluster. 
Conservatively, this should revert to one reducer.

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