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https://issues.apache.org/jira/browse/MAHOUT-977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13211821#comment-13211821
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Aleksei Udatšnõi commented on MAHOUT-977:
-----------------------------------------
Answering your question .. I kept the superclass only for backward
compatibility purposes. I doubt anyone is using it in production.
Just in case it is used somewhere in experimental environment, it will keep
working. If you find it is not useful any more, I can eliminate it.
> 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
> Fix For: 0.7
>
> 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=bedbrxop...@mail.gmail.com%3E
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