[jira] Commented: (MAHOUT-483) Job RowSimilarityJob-Mapper-EntriesToVectorsReducer improvement

["Sebastian Schelter (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAHOUT-483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12899891#action_12899891 ] 

Sebastian Schelter commented on MAHOUT-483:
-------------------------------------------

Han Hui,

can you provide a patch and some numbers on the performance improvement the changes caused?

> Job RowSimilarityJob-Mapper-EntriesToVectorsReducer improvement 
> ----------------------------------------------------------------
>
>                 Key: MAHOUT-483
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-483
>             Project: Mahout
>          Issue Type: Test
>          Components: Collaborative Filtering
>    Affects Versions: 0.4
>            Reporter: Han Hui Wen 
>             Fix For: 0.4
>
>         Attachments: screenshot-3.jpg
>
>
> the Mapper phase of Job RowSimilarityJob-Mapper-EntriesToVectorsReducer uses too long time but do nothing actually.
> Can we move the EntriesToVectorsReducer task to Mapper phase ? set the Reducer phase is null,
> So can improve the performance.

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