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https://issues.apache.org/jira/browse/JCR-3892?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Manfred Baedke reassigned JCR-3892:
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Assignee: Manfred Baedke (was: Tobias Bocanegra)
> Selective invalidation of MembershipCache
> -----------------------------------------
>
> Key: JCR-3892
> URL: https://issues.apache.org/jira/browse/JCR-3892
> Project: Jackrabbit Content Repository
> Issue Type: Improvement
> Components: jackrabbit-core
> Affects Versions: 2.6, 2.8
> Reporter: Tobias Bocanegra
> Assignee: Manfred Baedke
>
> The MembershipCache is invalidated whenever any group membership changes.
> this was a simple way to avoid complex transitive invalidation strategies.
> In a system with a large user, group and member based, the lookup of group
> memberships can be especially slow, due to the reverse lookup of the
> weak-references of the members - in those systems, a good cache is essential.
> If additionally the group memberships change ofter, maybe due to changing
> entitlements of groups, or when synchronizing with an external IDP, the cache
> is constantly flushed, thus causing performance problems for each membership
> lookup.
> there can be other remedies to speed up lookup, for example to properly
> enable the group-split-size; or to implement a custom principal provider for
> highly dynamic memberships.
> nevertheless, if the membership cache would only invalidate what has changed,
> it would help the performance for those authorizables that weren't affected.
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