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From "Jukka Zitting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-2762) Optimize bundle serialization
Date Tue, 12 Oct 2010 16:21:34 GMT

    [ https://issues.apache.org/jira/browse/JCR-2762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12920249#action_12920249
] 

Jukka Zitting commented on JCR-2762:
------------------------------------

There's a few other optimizations I've been working on, most notably improved handling of
date and long values, but patches 1-4 already achieve most of the potential size reductions.
With these patches the size of typical bundles is down about 30-40% from before. The main
benefits of the smaller bundle size are reduced disk usage and therefore faster I/O and more
optimal use of disk caches.

Note that all persistence managers necessarily have some storage overhead over the plain bundle
size, so the total improvements will not be nearly as big as suggested by the bundle size
reduction. For example, with these patches the size of the default workspace of a fresh installation
of our proprietary CQ product drops from 154MB to 141MB (-9%). The time it took to fill the
workspace (including writes to data store, etc.) went down from 85s to 72s (-16%), though
this was just a single try so the performance numbers are fairly uncertain.

I didn't yet commit these changes since changing the serialization format always carries some
risk (though we now have a fairly good serialization test cases) and prevents switching back
to an older version after an upgrade. The question therefore is, should we do this now for
Jackrabbit 2.2 or postpone this for 2.3? I'm inclined to do this already in 2.2.

> Optimize bundle serialization
> -----------------------------
>
>                 Key: JCR-2762
>                 URL: https://issues.apache.org/jira/browse/JCR-2762
>             Project: Jackrabbit Content Repository
>          Issue Type: Improvement
>          Components: jackrabbit-core
>            Reporter: Jukka Zitting
>            Priority: Minor
>         Attachments: 0001-JCR-2762-Optimize-bundle-serialization.patch, 0002-JCR-2762-Optimize-bundle-serialization.patch,
0003-JCR-2762-Optimize-bundle-serialization.patch, 0004-JCR-2762-Optimize-bundle-serialization.patch
>
>
> There are a number of ways we could use to make bundle serialization more optimized.
Thomas has already done some work on this in the Jackrabbit 3 sandbox, and I'd like to apply
some of the optimizations also to the trunk.

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