UserManagement: membership cache default size too small
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Key: JCR-2943
URL: https://issues.apache.org/jira/browse/JCR-2943
Project: Jackrabbit Content Repository
Issue Type: Improvement
Components: security
Affects Versions: 2.2.4, 2.2.2, 2.2.1, 2.2.0
Environment: Repository with users being member of over 150 groups
Reporter: Honwai Wong
The membership cache that has been introduced in JCR-2703 is making use of an
LRUMap to cache group memberships (authorizable nodeId -> group nodeIds). In
environments where users belong to more than 100 groups, the cache quickly
becomes ineffective due to the default maximum size of the LRUMap.
Once the cache limit is hit, the rather expensive Node#getWeakReferences API
calls resulting in search queries are executed again, leading to quite
noticeable performance drops. Thus I'd suggest to either make the membership
cache configurable or introduce some logic to let the cache grow dynamically as
needed (still having some kind of hard limit to avoid memory issues).
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