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https://issues.apache.org/jira/browse/JCR-2699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12917381#action_12917381
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Ian Boston commented on JCR-2699:
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One more change that I have made locally that allows concurrent reads with
blockages now appearing in the SharedItemCache is to eliminate the
synchronization inside the AbrstractPrincipalProvider protecting the LRUMap.
Instead of syncing I am not expecting concurrent modification exceptions and as
per the LRUMap documentation NPE on concurrent access. If I take this approach
I dont see any exceptions from the LRUMap at 50 concurrent threads, and I dont
get any blocking at that level.
> Improve read/write concurrency
> ------------------------------
>
> Key: JCR-2699
> URL: https://issues.apache.org/jira/browse/JCR-2699
> Project: Jackrabbit Content Repository
> Issue Type: Improvement
> Components: jackrabbit-core
> Reporter: Jukka Zitting
> Assignee: Jukka Zitting
> Attachments: AccessControlProviderHolder.java,
> ConcurrentReadTest.png, DynamicSecurityManager-JCR2699.patch
>
>
> I'd like to set up a few performance tests to help identify our worst
> bottlenecks for various kinds of concurrent read-only and read-write access
> patterns.
> Once identified, I'm hoping to fix at least some of those bottlenecks.
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