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From "Sean Owen (JIRA)" <>
Subject [jira] Commented: (MAHOUT-441) File-backed IDMigrator
Date Sat, 17 Jul 2010 12:38:50 GMT


Sean Owen commented on MAHOUT-441:

Can you post the file UpdatableIDMigrator? The patch shows it as an update but it's a new
file and it won't apply. I can't figure out the content from the patch.

The rest is OK -- might see if you can configure the IDE to not change whitespace, and, watch
out for the copyright headers. I can adjust this locally.

> File-backed IDMigrator
> ----------------------
>                 Key: MAHOUT-441
>                 URL:
>             Project: Mahout
>          Issue Type: New Feature
>          Components: Collaborative Filtering
>            Reporter: Sebastian Schelter
>         Attachments: MAHOUT-441.patch
> To complete taste's suite of file-related implementations (currently FileDataModel and
FileItemSimilarity) I created an IDMigrator backed by a file. It can be refreshed and will
reload it's data into memory in the same way FileDataModel and FileItemSimilarity are already
doing this.
> I couldn't prevent having to split up the IDMigrator interface into 2 separate interfaces
because the update methods (like storeMapping(...) and initialize(...)) did not fit in the
concept of reloading data from an external source, hope that's ok.

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