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https://issues.apache.org/jira/browse/JCR-1112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12525529
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Raffaele Sena commented on JCR-1112:
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I can reproduce this problem or something related to this by simply importing
an XML file with a few thousand nodes. The more nodes I have in the repository
and the more time the system spend in rebalancing the cache, pretty much at
every access to the repository.
I was experimenting with a system with a simple hierarchical structure like:
/users
user1
user2
user3
for each user I had a large data structure stored as XML (like an imported XML
file)
with such a system, even with only a few users, accessing to the node
/users/<userX> takes seconds (and the more users or complex structure I have
the longer it takes) and all I see in the logs is resizeAll() messages
> CacheManager interval between recalculation of cache sizes should be
> configurable
> ---------------------------------------------------------------------------------
>
> Key: JCR-1112
> URL: https://issues.apache.org/jira/browse/JCR-1112
> Project: Jackrabbit
> Issue Type: New Feature
> Components: core
> Reporter: Przemo Pakulski
> Priority: Minor
> Attachments: JCR-1112.txt
>
>
> Currently interval between recaluclation of cahce size is hard coded to 1000
> ms. Resizing/recalculation of cache size is quite expensive method
> (especially getMemoryUsed on MLRUItemStateCache is time consuming)
> Depending on the configuration, we realized that under some load up to 10-15%
> percent of CPU time (profiler metrics) could be spend doing such
> recalculations. It does not seem to be needed to resize cache every second.
> Best this interval should be configurable in external config. file with other
> cache settings (like memory sizes).
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