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MapReduce >> mail # user >> Null mapper?


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)?

Thanks,

DR
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB