[MAHOUT-802] Start Phase doesn't properly work in RecommenderJob

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.6
• Assignee: Grant Ingersoll
• Reporter: Grant Ingersoll
• Created: 07/Sep/11 20:20
• Updated: 09/Feb/12 14:00
• Resolved: 27/Sep/11 12:24

Description

I'm trying to run RecommenderJob and do --startPhase 2 since I have my prefs already in the right format. Unfortunately, when I do that, I get:

java.lang.IllegalArgumentException: Number of columns was not correctly set!
at com.google.common.base.Preconditions.checkArgument(Preconditions.java:88)
at org.apache.mahout.math.hadoop.similarity.RowSimilarityJob$SimilarityReducer.setup(RowSimilarityJob.java:296)
at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:174)
at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:648)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:416)
at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:256)

This appears to be due to the fact that the numberOfUsers variable defaults to 0 and is only set when phase 1 is run.