Details
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Bug
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Status: Closed
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Minor
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Resolution: Fixed
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None
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None
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None
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.