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Posted to dev@mahout.apache.org by "Sebastian Schelter (JIRA)" <ji...@apache.org> on 2011/05/19 12:02:47 UTC

[jira] [Updated] (MAHOUT-704) Refactor PredictionJob to use MultipleInputs for reduce side joins

     [ https://issues.apache.org/jira/browse/MAHOUT-704?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sebastian Schelter updated MAHOUT-704:
--------------------------------------

    Description: 
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.

  was:
The code in org.apache.mahout.cf.taste.hadoop.als.PredictionJob should be refactored to use import 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 an other 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.


> 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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