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https://issues.apache.org/jira/browse/OAK-4844?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Dürig updated OAK-4844:
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Attachment: OAK-4844.patch
Attaching [^OAK-4844.patch] which squeezes the size of record ids to 6 bytes.
It does so by pretty much the same mechanism we had pre OAK-4631. Just that it
is using an integer now as an index into the table of segment references
instead of a byte (thus 6 bytes instead of 3). This is to ensure we don't
regress on OAK-2896.
[~alex.parvulescu] could you run upgrade with this patch on you test
repositories and share the results here so we can compare pre OAK-4631, post
OAK-4631 and OAK-4631 with this patch?
[~dulceanu] I had to adjust a test expectation in
{{MBeanTests.testClientAndServerEmptyConfig()}}. Please double check.
[~frm] please review and comment
> Analyse effects of simplified record ids
> ----------------------------------------
>
> Key: OAK-4844
> URL: https://issues.apache.org/jira/browse/OAK-4844
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: segment-tar
> Reporter: Michael Dürig
> Assignee: Michael Dürig
> Labels: performance
> Fix For: Segment Tar 0.0.14
>
> Attachments: OAK-4844.patch
>
>
> OAK-4631 introduced a simplified serialisation for record ids. This causes
> their footprint on disk to increase from 3 bytes to 18 bytes. OAK-4631 has
> some initial analysis on the effect this is having on repositories as a
> whole.
> I'm opening this issue as a dedicated task to further look into mitigation
> strategies (if necessary).
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