[jira] [Issue Comment Edited] (MAHOUT-977) Thread-safe version of PlusAnonymousUserDataModel with multiple concurrent users

["Aleksei Udatšnõi (Issue Comment Edited JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAHOUT-977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13210303#comment-13210303 ] 

Aleksei Udatšnõi edited comment on MAHOUT-977 at 2/17/12 2:57 PM:
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Added a new class _PlusAnonymousConcurrentUserDataModel_ which enables multiple concurrent users to submit and consume anonymous preferences in a thread-safe manner. 
                
      was (Author: udachny):
    Added a new class _PlusAnonymousConcurrentUserDataModel_ which enables multiple concurrent users to submit and consumer anonymous ratings.
                  
> Thread-safe version of PlusAnonymousUserDataModel with multiple concurrent users
> --------------------------------------------------------------------------------
>
>                 Key: MAHOUT-977
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-977
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Collaborative Filtering
>    Affects Versions: 0.6
>            Reporter: Aleksei Udatšnõi
>            Assignee: Sean Owen
>            Priority: Minor
>         Attachments: MAHOUT-977.patch
>
>
> This is a suggested improvement to PlusAnonymousUserDataModel. 
> Currently the ID of the anonymous user is fixed to Long.MIN_VALUE. Only one set
> of temp data can be inserted into the model and used at one time.
> I propose the change to enable multiple users to insert into this
> model concurrently in a thread-safe manner.
> The idea is to define a pool of available anonymous user IDs. Every
> time a new anonymous user makes a request, the next available
> TEMP_USER_ID is pulled from the queue. After recommendations are
> retrieved, the TEMP_USER_ID can be returned to the pool.
> The discussion about this topic can be found in:
> http://mail-archives.apache.org/mod_mbox/mahout-dev/201202.mbox/%3CCAEccTywC7QJuAJj-u3C1C=WW0yEeBcScUE6Kmj=bedBrxOpsSg@mail.gmail.com%3E

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