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From "Ian Boston (JIRA)" <j...@apache.org>
Subject [jira] Updated: (JCR-2699) Improve read/write concurrency
Date Sun, 03 Oct 2010 10:41:34 GMT

     [ https://issues.apache.org/jira/browse/JCR-2699?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ian Boston updated JCR-2699:
----------------------------

    Attachment: DynamicSecurityManager-JCR2699.patch
                AccessControlProviderHolder.java

The patch is to my modified version of DefaultSecurityManager, which is a very close copy
of the original.
The AccessControlProviderHolder manages the binding of AccessControlProviders to threads and
provides a cleanup mechanism when threads go. Initial profiling indicates that with a high
volume of thread mortality memory is not leaking.

Neither of these fully solve the problem of thread blocking for highly concurrent reads, but
they do improve the situation a bit.


> 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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