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https://issues.apache.org/jira/browse/MAHOUT-340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12849683#action_12849683
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Hui Wen Han commented on MAHOUT-340:
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I just replaced all related int type with long type, it works fine and the
performance is very good.
I　has another question :
the original data has 21,545 users totally and has about 640,000 items,
it can only generate 153,942 recommendations for 2,694 users,
many users has no recommendations generated
> org.apache.mahout.cf.taste.hadoop.cooccurence can not support long as user_id
> and item_id
> -----------------------------------------------------------------------------------------
>
> Key: MAHOUT-340
> URL: https://issues.apache.org/jira/browse/MAHOUT-340
> Project: Mahout
> Issue Type: Improvement
> Components: Collaborative Filtering
> Affects Versions: 0.3
> Reporter: Hui Wen Han
> Fix For: 0.4
>
>
> I have preferences data using long as user_id and item_id,
> hadoop cooccurence arithmetic can not support it
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