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MapReduce, mail # user - Null mapper?

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Null mapper?
David Rosenstrauch 2010-08-16, 20:25
Is it possible for a M/R job to have no mapper?  i.e.:
job.setMapperClass(null)?  Or is it required that one at least use an
"identity mapper" (i.e., plain vanilla org.apache.hadoop.mapreduce.Mapper)?