[MAHOUT-977] Thread-safe version of PlusAnonymousUserDataModel with multiple concurrent users

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.6
• Fix Version/s: 0.7
• Assignee: Sean R. Owen
• Reporter: Aleksei Udatšnõi
• Created: 15/Feb/12 09:45
• Updated: 31/Jan/24 22:11
• Resolved: 17/Feb/12 15:33

Description

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=[e-mail]%3E