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https://issues.apache.org/jira/browse/UNOMI-817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17839040#comment-17839040
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Jonathan Sinovassin-Naïk commented on UNOMI-817:
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PR: https://github.com/apache/unomi/pull/659
> past event conditions can generate mapping explosions
> -----------------------------------------------------
>
> Key: UNOMI-817
> URL: https://issues.apache.org/jira/browse/UNOMI-817
> Project: Apache Unomi
> Issue Type: Improvement
> Reporter: Romain Gauthier
> Assignee: Jonathan Sinovassin-Naïk
> Priority: Major
> Fix For: unomi-2.5.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> For past event conditions, we add a property \{{eventTriggered+md5}} to the
> profile and session indexes.
> But these properties are never cleaned even if the th condition doesn't exist
> anymore.
> This can result in a large number of properties getting added to the index,
> and could lead to a mapping explosion.
> Tech notes:
> * These properties need to be moved to a nested or flattened property
> (ensure it performs well and that each eventTrigger doesn't NOT create a new
> mapping, we need only one mappping for all eventTriggered)
> * pastEventQueryBuilder, pastEventConditionEvaluator, setEventOccurenceCount
> action need to be updated
> * If there is a way to prevent these properties to be copied to the session,
> that would be great
> * Requires a migration script, including a full reindexation of the profiles
> to clean previous mappings
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