[jira] Resolved: (MAHOUT-213) storeMapping should not been called when toLongID() is called

["Sean Owen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAHOUT-213?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen resolved MAHOUT-213.
------------------------------

       Resolution: Fixed
    Fix Version/s: 0.3

> storeMapping should not been called when toLongID() is called
> -------------------------------------------------------------
>
>                 Key: MAHOUT-213
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-213
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Collaborative Filtering
>    Affects Versions: 0.3
>            Reporter: Jeff Zhang
>            Assignee: Sean Owen
>            Priority: Minor
>             Fix For: 0.3
>
>         Attachments: Mahout_213.patch
>
>
> In the trunk, storeMapping is called always when toLongID() is called. In my opinion storeMapping should been called only in method initialize().
> storeMapping will cost a lot when you use database to store the id mapping. I believe the code should like this:
> {code}
>   public void initialize(Iterable<String> stringIDs) throws TasteException {
>     for (String stringID : stringIDs) {
>       long longID = hash(stringID);
>       storeMapping(longID, stringID);
>     }
>   }
> {code}

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