Tobias Bocanegra created JCR-3892:
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Summary: 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: 2.8, 2.6
Reporter: Tobias Bocanegra
Assignee: Tobias Bocanegra
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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