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From Michael Dürig (JIRA) <j...@apache.org>
Subject [jira] Updated: (JCR-2050) Optimize refresh operations
Date Tue, 31 Mar 2009 14:47:07 GMT

     [ https://issues.apache.org/jira/browse/JCR-2050?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Michael Dürig updated JCR-2050:

    Attachment: JCR-2050.patch

Patch implementing above proposal. Also adds a test suite to  	 jackrabbit-jcr-benchmark to
validate the claims. 

> Optimize refresh operations 
> ----------------------------
>                 Key: JCR-2050
>                 URL: https://issues.apache.org/jira/browse/JCR-2050
>             Project: Jackrabbit Content Repository
>          Issue Type: Improvement
>          Components: jackrabbit-jcr-benchmark, jackrabbit-jcr2spi
>            Reporter: Michael Dürig
>            Assignee: Michael Dürig
>            Priority: Minor
>         Attachments: JCR-2050.patch
> With the current implementation (recursive) refresh operations cause a full traversal
of the sub-tree rooted at the item causing the refresh. This is potentially expensive. 
> Instead of invalidating each item in the respective sub-tree I propose to mark the root
of the sub-tree as invalidated. Such a mark would include a time stamp. Also individual items
would be time stamped with their resolution time. When an item is accessed, it would check
if its resolution time stamp is older than the latest invalidation time stamp. If so, it checks
whether the invalidation applies to it at all (by traversing up the path) and if so it would
re-resolve itself. In any case its resolution time stamp will be updated.
> This approach would make invalidation much cheaper without putting much additional load
to simple item access. Moreover most of the additional load (traversing up the path) only
applies when an invalidation is pending.

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