[jira] [Created] (MAHOUT-1637) RecommenderJob of ALS fails in the mapper because uses the instance of other class

["Cristian Galán (JIRA)" <ji...@apache.org>]

Cristian Galán created MAHOUT-1637:
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             Summary: RecommenderJob of ALS fails in the mapper because uses the instance of other class
                 Key: MAHOUT-1637
                 URL: https://issues.apache.org/jira/browse/MAHOUT-1637
             Project: Mahout
          Issue Type: Bug
          Components: Collaborative Filtering
    Affects Versions: 0.9
            Reporter: Cristian Galán
             Fix For: 1.0


In the map method of PredictionMapper when executes the next line:       Pair<OpenIntObjectHashMap<Vector>, OpenIntObjectHashMap<Vector>> uAndM = getSharedInstance();
the job fail because obtains the instance of other class. This occurs because I launch a local job, so the instance exists previously and for this doesn't make the new correct instance for ALS.

The solution that it works me is to add the next line:.
        SharingMapper.reset();
in method run of JobRecommender of org.apache.mahout.cf.taste.hadoop.als package 

I have to test it in my environment with distributed mapreduce, hadoop fs, zookeeper and others if it works correctly.



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