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Michael Dürig commented on OAK-6912:
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Prior to OAK-5956 (i.e. in Oak 1.6) the hit count and all derived metrics are not correct.
> Cold standby performance regression due to segment caching
> ----------------------------------------------------------
>
> Key: OAK-6912
> URL: https://issues.apache.org/jira/browse/OAK-6912
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: segment-tar, tarmk-standby
> Affects Versions: 1.7.0
> Reporter: Andrei Dulceanu
> Assignee: Andrei Dulceanu
> Labels: cold-standby, performance, scalability
> Fix For: 1.8, 1.7.12
>
>
> The changes to the segment cache introduced in r1793527 [0] introduced a performance
regression on the primary for the case in which a standby is attached to it. Below a benchmark
duration comparison between primary w/o and w/ standby for r1793527 (after the segment cache
changes) and r1793526 (before the changes) :
> |Oak 1.6 r1793527 (20170502)|{noformat}
> # BasicWriteTest C min 10% 50% 90% max N
> Oak-Segment-Tar 1 19 21 22 26 160 2491
> Oak-Segment-Tar-DS 1 56 59 63 70 181 919
> Oak-Segment-Tar-Cold(Shared DS) 1 58 66 159 177 372 302
> {noformat}|
> |Oak 1.6 r1793526 (20170502)|{noformat}
> # BasicWriteTest C min 10% 50% 90% max N
> Oak-Segment-Tar 1 19 21 22 25 52 2584
> Oak-Segment-Tar-DS 1 56 60 63 69 158 925
> Oak-Segment-Tar-Cold(Shared DS) 1 57 60 64 70 122 915
> {noformat}|
> [0] https://github.com/apache/jackrabbit-oak/commit/efafa4e1710621b7f3b8e92d0b2681669185fcd4
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