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https://issues.apache.org/jira/browse/JCR-3374?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marcel Reutegger updated JCR-3374:
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Attachment: JCR-3374.patch
Proposed patch.
> Size estimate for AbstractBundlePersistenceManager.MISSING is too low
> ---------------------------------------------------------------------
>
> Key: JCR-3374
> URL: https://issues.apache.org/jira/browse/JCR-3374
> Project: Jackrabbit Content Repository
> Issue Type: Bug
> Components: jackrabbit-core
> Affects Versions: 2.0.3, 2.1.2, 2.2, 2.3, 2.4, 2.5
> Reporter: Marcel Reutegger
> Priority: Minor
> Attachments: JCR-3374.patch
>
>
> A heap dump from a Jackrabbit 2.2 based system recently showed that the
> ConcurrentCache of the bundle persistence managers used a lot more memory
> than configured. One of them used 10 times the configured bundle size.
> It turned out that the majority of the cache entries referenced
> AbstractBundlePersistenceManager.MISSING. The size estimate of 16 bytes is
> too low and does not account for the overhead that comes with the internal
> LinkedHashMap of the ConcurrentCache.
> I think a more sensible value is 128 bytes, which is the sum of:
> - 32 bytes for ConcurrentCache.E
> - 64 bytes for LinkedHashMap.Entry
> - 32 bytes for NodeId
> The unified cache, which also includes missing NodePropBundle entries was
> introduced with JCR-2699.
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