another example for map reduction in python
hadoop jar /home/hadoop/hadoop/share/hadoop/tools/lib/hadoop-streaming-2.5.2.jar
-D mapreduce.job.reduces=1
-input /user/claudio/NASA_access_log_Aug95
-output /user/claudio/output/kk4.output
-file /home/hadoop/map2.py
-file /home/hadoop/red2.py
-mapper /home/hadoop/map2.py
-reducer /home/hadoop/red2.py