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https://issues.apache.org/jira/browse/OAK-9180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17179077#comment-17179077
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Miroslav Smiljanic commented on OAK-9180:
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Patch with proposed optimisation:
[^OAK-9180.patch]
> Optimise synchronisation between threads when writing to 3rd level segment
> cache
> ---------------------------------------------------------------------------------
>
> Key: OAK-9180
> URL: https://issues.apache.org/jira/browse/OAK-9180
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Reporter: Miroslav Smiljanic
> Priority: Major
> Attachments: OAK-9180.patch
>
>
> Currently threads that are updating 3rd level segment cache, are obtaining
> lock on the instance of HashMap, before inserting segmentId.
> This can be optimised by using Set, obtained from
> ConcurrentHashMap.newKeySet().
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