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https://issues.apache.org/jira/browse/MAHOUT-350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851322#action_12851322
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Hui Wen Han commented on MAHOUT-350:
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I　run job using following command:
hadoop org.apache.mahout.cf.taste.hadoop.item.RecommenderJob
-Dmapred.job.name=HADOOP_REC_tap_tag\ -Dmapred.reduce.tasks=20 --input
/steer/item/in --tempDir /steer/item/temp --output /steer/item/out --jarFile
mahout-0.4-SNAPSHOT.jar --numRecommendations 10 --usersFile
/steer/item/usersFile
-Dmapred.reduce.tasks=20 seems that does not work,
also there seems no options related to job name.
http://hadoop.apache.org/common/docs/current/mapred-default.html
http://hadoop.apache.org/common/docs/current/core-default.html
> 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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