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https://issues.apache.org/jira/browse/JCR-2703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12897207#action_12897207
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angela commented on JCR-2703:
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i opened a separate task (JCR-2706) to evaluate if this new membership cache
makes the principal-membership-cache in DefaultPrincipalProvider obsolete.
> UserManagement: Add Membership Cache
> ------------------------------------
>
> Key: JCR-2703
> URL: https://issues.apache.org/jira/browse/JCR-2703
> Project: Jackrabbit Content Repository
> Issue Type: Improvement
> Components: jackrabbit-core, security
> Affects Versions: 2.0.0, 2.1.0
> Reporter: angela
> Assignee: angela
> Fix For: 2.2.0
>
>
> due to weakreference nature of the group members, retrieving the groups a
> given authorizable is member is expensive as the corresponding
> API call (Node#getWeakReferences) executes a query [fallback if search is
> disabled: traversing the complete group tree, which isn't for free either].
> i would therefore suggest to add a cache (authorizable nodeId -> group
> nodeids) that is gets cleared upon any modification to group membership or
> group removal and doesn't need any extra observation. this cache may
> potentially obsolete the principal-based cache in DefaultPrincipalProvider...
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