Add additional jobs of new types to gridmix
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                 Key: HADOOP-2889
                 URL: https://issues.apache.org/jira/browse/HADOOP-2889
             Project: Hadoop Core
          Issue Type: Improvement
          Components: mapred
            Reporter: Runping Qi



Currently, gridmix does not contain any jobs using combiners nor a job sorting 
compressed input data
Word count like jobs should be a good candidate of using combiners.
Sorting compressed input data should exercise the mapper spill logic and/or the 
effect of map output compression.
 

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