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https://issues.apache.org/jira/browse/OAK-6915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16243774#comment-16243774
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Andrei Dulceanu commented on OAK-6915:
--------------------------------------
[~frm], here's a couple of benchmark results when running {{BasicWriteTest}} on
all three segment fixtures:
|Oak 1.8-SNAPSHOT *without patch*|{noformat}
# BasicWriteTest C min 10% 50% 90% max
N
Oak-Segment-Tar 1 19 21 22 25 77
2540
Oak-Segment-Tar-DS 1 57 61 64 70 124
908
Oak-Segment-Tar-Cold(Shared DS) 1 183 189 198 214 295
211
{noformat}|
|Oak 1.8-SNAPSHOT *with patch*|{noformat}
# BasicWriteTest C min 10% 50% 90% max
N
Oak-Segment-Tar 1 20 22 23 27 164
2414
Oak-Segment-Tar-DS 1 59 62 65 70 127
902
Oak-Segment-Tar-Cold(Shared DS) 1 57 62 65 70 116
891
{noformat}|
> 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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