Major Description
VectorWritable#toString method is currently default implementation.
It should be implemented appropriately.
For instance, after running RecommenderJob, I inspect the temporary files on HDFS.
$ hadoop fs -libjars /path/to/mahout-core-0.5-job.jar -text temp/userVectors/part-r-00000
But this command returns
2 org.apache.mahout.math.VectorWritable@15f48262 4 org.apache.mahout.math.VectorWritable@15f48262
If the toString is not default implementation, we can see this result.
2 {101:2.0,104:2.0,103:5.0,102:2.5}
4 {101:5.0,106:4.0,104:4.5,103:3.0}