Thread-safe version of PlusAnonymousUserDataModel with multiple concurrent users
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Key: MAHOUT-977
URL: https://issues.apache.org/jira/browse/MAHOUT-977
Project: Mahout
Issue Type: Improvement
Components: Collaborative Filtering
Affects Versions: 0.7
Reporter: Aleksei Udatšnõi
Assignee: Sean Owen
Priority: Minor
Fix For: 0.7
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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