Refactor PredictionJob to use MultipleInputs for reduce side joins
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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 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.
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