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https://issues.apache.org/jira/browse/MAHOUT-484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12900312#action_12900312
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Sean Owen commented on MAHOUT-484:
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That's a JVM bug, nothing to do with Mahout.

> The RecommenderJob exit ,some sub-jobs can not be run.
> ------------------------------------------------------
>
>                 Key: MAHOUT-484
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-484
>             Project: Mahout
>          Issue Type: Test
>          Components: Collaborative Filtering
>    Affects Versions: 0.4
>            Reporter: Han Hui Wen 
>         Attachments: hs_err_pid7384.log, screenshot-1.jpg, screenshot-2.jpg
>
>
> I have done a few test today, 
> The RecommenderJob exit in middle.
> The first time it exited when it finished 
> RowSimilarityJob-CooccurrencesMapper-SimilarityReducer
> the second time it exited when it finished 
> RECOMMENDATION_dogear_bookmark-Mapper-EntriesToVectorsReducer

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