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https://issues.apache.org/jira/browse/OAK-2939?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Dürig updated OAK-2939:
-------------------------------
    Issue Type: Improvement  (was: Sub-task)
        Parent:     (was: OAK-2849)

> Make compaction gain estimate more accurate
> -------------------------------------------
>
>                 Key: OAK-2939
>                 URL: https://issues.apache.org/jira/browse/OAK-2939
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: segmentmk
>            Reporter: Michael Dürig
>            Assignee: Michael Dürig
>             Fix For: 1.3.1
>
>
> Currently the compaction gain estimation process only takes the current head 
> into account when calculating the retained size. We could make it more 
> accurate by also taking in memory references into account. This would prevent 
> compaction from running when many in memory references would later on prevent 
> segments from being cleaned up. 
> Also for OAK-2862, we would need a way to include the segments used for the 
> persisted compaction map in the retained size. 
> While at it, we could try to improve logging so information on how much space 
> is retained by the current head, in memory references and the persisted 
> compaction map would be logged separately. 



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