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https://issues.apache.org/jira/browse/MAHOUT-202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12779407#action_12779407
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Sean Owen commented on MAHOUT-202:
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I think it make sense to support this, so would accept a patch here. However I 
am concerned that performance will be so slow as to make it difficult to use. 
If a data set is too big to fit into memory, one can already put it in a 
relational database. But even when that database is sitting on the same 
machine, optimized and so on, it's orders of magnitude slower. Moving to a 
remote data store gets even worse.

At that scale I suppose I'd advise someone to give up real-time recommendations 
and go with some natively Hadoop-ified algorithm. DataModel supports, really, 
real-time implementations.

Anyway that's why it's not on my to-do list but would accept a patch.

> Make Taste support HBase as data store
> --------------------------------------
>
>                 Key: MAHOUT-202
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-202
>             Project: Mahout
>          Issue Type: New Feature
>          Components: Collaborative Filtering
>    Affects Versions: 0.3
>            Reporter: Jeff Zhang
>
> I'd like to add hbase as another data store option for taste.

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