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https://issues.apache.org/jira/browse/UNOMI-690?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kevan Jahanshahi reassigned UNOMI-690:
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Assignee: Kevan Jahanshahi
> Control groups dont work
> ------------------------
>
> Key: UNOMI-690
> URL: https://issues.apache.org/jira/browse/UNOMI-690
> Project: Apache Unomi
> Issue Type: Bug
> Reporter: romain.gauthier
> Assignee: Kevan Jahanshahi
> Priority: Major
> Fix For: unomi-1.7.0, unomi-2.1.0
>
>
> In short: I think visitors that are not in the control group can fall into it
> every time a variant is displayed, which means that if you're not in a
> control group, you just have to refresh the page until you fall into it
> (except if the traffic allocation for the control group is 0%)
> h3. Steps to reproduce
> - Create a content personalization with variant A (fallback, no condition)
> and variant b (page views > 2)
> - Set control group to 25%, save & publish
> - Open anonymous browser, refresh, refresh, refresh, refresh - close browser
> - Open anonymous browser, refresh, refresh, refresh, refresh - close browser
> - Open anonymous browser, refresh, refresh, refresh, refresh - close browser
> h3. Observed behavior
> After a 5-10 refresh, the visitor will always see the default variant. If you
> look in network, you'll see that the visitor is in the control group, always.
> It looks like the control group calculation is done for every variant
> decisioning and that we dont store the fact that a visitor is NOT in a
> control group.
> h3. Expected behaviours
> - Visitors profiles that are in the control group for the personalization
> should stay in the control group - OK
> - Visitor profiles that are NOT in the control group for the personalization
> should stay out of it - KO
> Looking at the class
> https://github.com/apache/unomi/blob/master/services/src/main/java/org/apache/unomi/services/impl/personalization/PersonalizationServiceImpl.java
> the problem can easily be seen: the code just checks if the control group
> exists and the control group is never assigned to "false".
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