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Date: Wed, 1 Apr 2009 06:17:13 -0700 (PDT)
From: =?utf-8?Q?Michael_D=C3=BCrig_=28JIRA=29?= <jira@apache.org>
To: dev@jackrabbit.apache.org
Subject: [jira] Updated: (JCR-2050) Optimize refresh operations
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     [ https://issues.apache.org/jira/browse/JCR-2050?page=3Dcom.atlassian.=
jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael D=C3=BCrig updated JCR-2050:
-------------------------------

    Attachment: JCR-2050-2.patch

Updated patch.
This patch incorporates suggestions from Angela (thanks!)

> Optimize refresh operations=20
> ----------------------------
>
>                 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 D=C3=BCrig
>            Assignee: Michael D=C3=BCrig
>            Priority: Minor
>         Attachments: JCR-2050-2.patch, JCR-2050.patch, jcr.log.excerpt.tx=
t
>
>
> With the current implementation (recursive) refresh operations cause a fu=
ll traversal of the sub-tree rooted at the item causing the refresh. This i=
s potentially expensive.=20
> 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 resoluti=
on time. When an item is accessed, it would check if its resolution time st=
amp is older than the latest invalidation time stamp. If so, it checks whet=
her the invalidation applies to it at all (by traversing up the path) and i=
f 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 a=
dditional load to simple item access. Moreover most of the additional load =
(traversing up the path) only applies when an invalidation is pending.

--=20
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