Hi, I am study mahout by Mahaout in Action Book. I have downloaded wikipedia links database and tried to executed recommendation for it using mahout and hadoop. I have used following command: hadoop jar mahout-core-0.6-job.jar org.apache.mahout.cf.taste.hadoop.item.RecommenderJob -Dmapred.input.dir=input/input.txt -Dmapred.output.dir=output --usersFile input/users.txt --booleanData true -s SIMILARITY_LOGLIKELIHOOD
The command took for execution about 4 hours on my Mac Book Pro. At the same time on my book the recommendation without hadoop have required about 2 minuts. So why mahout+hadoop so slow?
