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https://issues.apache.org/jira/browse/OAK-6915?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Francesco Mari updated OAK-6915:
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Attachment: OAK-6915-diagnostics.patch
To prove the point, the diagnostic patch modifies the {{FileStore}} to output
some statistics when it's closed. In particular, it shows the number of new
{{SegmentId}} instances created and the number of uncached segment reads
performed during the lifetime of the {{FileStore}}.
With this patch in place, I run {{StandbyTestIT}}. The test shows about 390
{{SegmentId}} allocations and 600K uncached segment reads.
> Minimize the amount of uncached segment reads
> ---------------------------------------------
>
> Key: OAK-6915
> URL: https://issues.apache.org/jira/browse/OAK-6915
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: segment-tar
> Reporter: Francesco Mari
> Assignee: Francesco Mari
> Fix For: 1.8, 1.7.12
>
> Attachments: OAK-6915-diagnostics.patch
>
>
> The current implementation of {{SegmentCache}} should make better use of the
> underlying Guava cache by relying on the cached segments instead of
> unconditionally performing an uncached segment read via the
> {{Callable<Segment>}} passed to {{SegmentCache#getSegment}}.
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