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https://issues.apache.org/jira/browse/MAHOUT-350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12850985#action_12850985
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Sean Owen commented on MAHOUT-350:
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I can add options for both of those, yes. I am not sure why Hadoop defaults to
one reducer when even the docs suggest a better default size. The number of
mappers is chosen intelligently.
While I'm at this, I'd like to take some time to reorganize how AbstractJob
works to refactor some of this code. I think we can reduce duplication even as
I add more options here. For example I'm not sure if we still need
DefaultOptionBuilder? I'll see what needs to stay there.
> add one "JobName" and reduceNumber parameter to
> org.apache.mahout.cf.taste.hadoop.item.RecommenderJob
> ------------------------------------------------------------------------------------------------------
>
> Key: MAHOUT-350
> URL: https://issues.apache.org/jira/browse/MAHOUT-350
> Project: Mahout
> Issue Type: Improvement
> Components: Collaborative Filtering
> Affects Versions: 0.4
> Reporter: Hui Wen Han
> Priority: Minor
> Attachments: screenshot-1.jpg
>
>
> Can add one "JobName" parameter to
> org.apache.mahout.cf.taste.hadoop.item.RecommenderJob?
> if there's a lot of RecommenderJob,it's hard to distinguish those jobs.
> also RecommenderJob has four sub jobs (or phase ) ,can add sub-job name to
> those phase ?
> Because RecommenderJob has not setNumReduceTasks ,it seems that the
> performance is not good in reduce phase.
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