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https://issues.apache.org/jira/browse/OAK-4635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Dürig updated OAK-4635:
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Attachment: OAK-4635.pdf
OAK-4635.m
[^OAK-4635.pdf] plots cache hit rate against number of nodes written for each
of above cache variants. All except OAK-4635-6 show poor cache hit rates for
big nodes (sub trees). Those are particular expensive as they cause a lot of
actual write operations.
[^OAK-4635.m] is the Matlab script containing the raw data from the log files
and the code to generate the graphs.
> Improve cache eviction policy of the node deduplication cache
> -------------------------------------------------------------
>
> Key: OAK-4635
> URL: https://issues.apache.org/jira/browse/OAK-4635
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: segment-tar
> Reporter: Michael Dürig
> Assignee: Michael Dürig
> Labels: perfomance
> Fix For: Segment Tar 0.0.12
>
> Attachments: OAK-4635.m, OAK-4635.pdf
>
>
> {{NodeCache}} uses one stripe per depth (of the nodes in the tree). Once its
> overall capacity (default 1000000 nodes) is exceeded, it clears all nodes
> from the stripe with the greatest depth. This can be problematic when the
> stripe with the greatest depth contains most of the nodes as clearing it
> would result in an almost empty cache.
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