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https://issues.apache.org/jira/browse/OAK-6915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16247421#comment-16247421
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Andrei Dulceanu commented on OAK-6915:
--------------------------------------
[~mduerig], [~frm], here are some durations as recorded on {{BasicWriteTest}}
for your latest version of the patches:
{{Oak-6915.patch}}:
{noformat}
# BasicWriteTest C min 10% 50% 90% max
N
Oak-Segment-Tar 1 20 22 26 35 126
2037
Oak-Segment-Tar-Cold 1 58 63 66 74 158
871
{noformat}
{{Oak-6915-03.patch}}:
{noformat}
# BasicWriteTest C min 10% 50% 90% max
N
Oak-Segment-Tar 1 19 22 23 29 249
2241
Oak-Segment-Tar-Cold 1 59 63 67 79 126
846
{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-6915-02.patch, OAK-6915-03.patch,
> OAK-6915-diagnostics-02.patch, OAK-6915-diagnostics.patch, OAK-6915.patch,
> Screen Shot 2017-11-09 at 14.14.28.png, Screen Shot 2017-11-09 at 14.16.59.png
>
>
> 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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