You should give more detail about the errors. You are running out of memory on the child workers. This is not surprising since the default memory they allocate is fairly small, and you're running a complete recommender system inside each mapper. It has not much to do with the size of the instane you use.
I am not sure what the second thing is, you should give more detail. On Fri, Jan 18, 2013 at 2:02 PM, Iñigo Llamosas <inigollamo...@gmail.com> wrote: > Hi, > > I am trying to run a simple recommender on AWS, but I'm getting errors when > reducing. These are the jar-parameters lines: > > s3://inigobucket/jars/mahout-core-0.8-SNAPSHOT-job.jar > > org.apache.mahout.cf.taste.hadoop.pseudo.RecommenderJob > -Dmapred.input.dir=s3://inigobucket/data/grouplens10m/ratings.dat > -Dmapred.output.dir=s3://inigobucket/output/ > --recommenderClassName > org.apache.mahout.cf.taste.impl.recommender.slopeone.SlopeOneRecommender > > Starts OK, but when reducing it gives 2 kind of problems. > > -Heap space error. This confuses me because I had that error with a 2 > m.small slave cluster but also with a 5 c1.medium slave cluster > -org.apache.hadoop.io.SecureIOUtils$AlreadyExistsException: EEXIST: File > exists error. > > Any suggestion? > > Many thanks, > > Inigo
