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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:
--------------------------------
Attachment: OAK-6915-01.patch
The first version of the fix is a partial rewrite of the {{SegmentCache}} to
make better use of the underlying Guava cache. The patch also contains a minor
fix for a unit test and some additional readjustments of related classes.
With this patch and the diagnostics patch in place, I run {{StandbyTestIT}}
once more. While the amount of allocations of new {{SegmentId}} remains
unchanged, the number of uncached segment reads is down to about 260.
There is still some work to do. With the patch in place a couple of integration
tests don't pass. Nevertheless, the preliminary data shows that the additional
work might be worth the effort.
> 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-6915-01.patch, 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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