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https://issues.apache.org/jira/browse/MAHOUT-704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13037455#comment-13037455
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Sebastian Schelter commented on MAHOUT-704:
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I rechecked and saw that in our currently used hadoop version,
org.apache.hadoop.mapreduce.lib.input.MultipleInputs does not yet exist, so
this ticket is only valid if we choose to upgrade for 0.6.
> Refactor PredictionJob to use MultipleInputs for reduce side joins
> ------------------------------------------------------------------
>
> Key: MAHOUT-704
> URL: https://issues.apache.org/jira/browse/MAHOUT-704
> Project: Mahout
> Issue Type: Improvement
> Components: Collaborative Filtering
> Affects Versions: 0.6
> Reporter: Sebastian Schelter
> Assignee: Sebastian Schelter
>
> The code in org.apache.mahout.cf.taste.hadoop.als.PredictionJob should be
> refactored to use org.apache.hadoop.mapreduce.lib.input.MultipleInputs for
> the reduce-side joins. This should spare us some M/R cycles and greatly
> simplify the code.
> We'd need to add another prepareJob() method to AbstractJob in order to make
> this work.
> This is a rather cosmetic feature request that can wait till after the 0.5
> release.
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