DL
-D mapred.reduce.tasks=1 \
-D mapred.output.compress=true \
-D mapred.compress.map.output=true \
-D mapred.output.compression.codec=com.hadoop.compression.lzo.LzopCodec \
-input /user/hadoop/mapreduce/input \
-output /user/hadoop/mapreduce/archive \
-mapper /bin/cat \
-reducer /bin/cat