[MAHOUT-1637] RecommenderJob of ALS fails in the mapper because it uses the instance of other class

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Cannot Reproduce
• Affects Version/s: 0.9
• Fix Version/s: 0.12.0
• Labels: als collaborative-filtering legacy
• Assignee: Andrew Musselman
• Reporter: Cristian Galán
• Created: 26/Dec/14 08:18
• Updated: 31/Jan/24 22:12
• Resolved: 10/Apr/16 06:06

Description

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.