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https://issues.apache.org/jira/browse/MAHOUT-1158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13597709#comment-13597709
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Adam Bozanich commented on MAHOUT-1158:
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patch here: https://github.com/apache/mahout/pull/14
> Migrate/transform IDs from alphanumeric to Long
> -----------------------------------------------
>
> Key: MAHOUT-1158
> URL: https://issues.apache.org/jira/browse/MAHOUT-1158
> Project: Mahout
> Issue Type: Improvement
> Components: Collaborative Filtering
> Reporter: Adam Bozanich
> Assignee: Sean Owen
> Priority: Minor
>
> Generating item similarities from user interactions or preferences doesn't
> necessarily require user IDs to remain consistent or even recoverable.
> ItemSimilarityJob could have a flag that transforms the IDs automatically.
> Use case: Input data is a collection of (cookie,product_id); cookie is
> alphanumeric. ItemSimilarityJob should be able to consume this data without
> needing the user to preprocess it.
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