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https://issues.apache.org/jira/browse/OAK-6483?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Davide Giannella closed OAK-6483.
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Bulk close for 1.7.9
> Segment-based composite node store performance degradation
> ----------------------------------------------------------
>
> Key: OAK-6483
> URL: https://issues.apache.org/jira/browse/OAK-6483
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: composite
> Affects Versions: 1.7.4
> Reporter: Tomek Rękawek
> Assignee: Tomek Rękawek
> Priority: Critical
> Fix For: 1.8, 1.7.9
>
>
> It seems that the OAK-4732 is not compatible with the composite node store
> using a segment node store as the main (writeable) store. The OAK-4732
> measures how much does it usually take to apply commit hooks and merge the
> new root. However, the composite node store plugs into the commit hook and
> reads other node store states. As a result, it may take quite a while and the
> measured values are big. They are then used to tune the lock inside the
> LockBasedScheduler#getHeadNodeState() method. Since the times are big, the
> method also waits a long time for the semaphore before it gives up. This
> causes performance degradation.
> The {{-Doak.scheduler.fetch.commitDelayQuantile=0}} parameter can be used to
> disable the OAK-4732.
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