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https://issues.apache.org/jira/browse/OAK-5111?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Dürig updated OAK-5111:
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Attachment: node-dedup-cache.xlsx
Excel sheet showing cleanup and compaction timing and efficacy for different
cache sizes on a longevity run of 13 days: [^node-dedup-cache.xlsx].
There is virtually no different between cache sizes 1, 2 and 4M. 8M seems
worse, most likely due to memory pressure. < 200k is also worse as most likely
there are too many cache misses. I would thus change the default cache size to
1M.
> Change default size of the node deduplication cache
> ---------------------------------------------------
>
> Key: OAK-5111
> URL: https://issues.apache.org/jira/browse/OAK-5111
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: segment-tar
> Reporter: Michael Dürig
> Assignee: Michael Dürig
> Labels: compaction, gc, perfomance
> Fix For: 1.6, 1.5.14
>
> Attachments: node-dedup-cache.xlsx
>
>
> The current default of the node deduplication cache is 8M. We should consider
> changing this to a smaller value still resulting in effective compactions.
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