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https://issues.apache.org/jira/browse/MAHOUT-802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13099599#comment-13099599
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Grant Ingersoll commented on MAHOUT-802:
----------------------------------------
patch coming either tonight or tomorrow am
> Start Phase doesn't properly work in RecommenderJob
> ---------------------------------------------------
>
> Key: MAHOUT-802
> URL: https://issues.apache.org/jira/browse/MAHOUT-802
> Project: Mahout
> Issue Type: Bug
> Reporter: Grant Ingersoll
> Priority: Minor
>
> 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:
> {quote}
> 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)
> {quote}
> This appears to be due to the fact that the numberOfUsers variable defaults
> to 0 and is only set when phase 1 is run.
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