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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 resolved OAK-2939.
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Resolution: Won't Fix
Resolving as won't fix as I think the compaction estimation currently works all
right. Including the in memory references wouldn't be the right thing as it
would change the semantics to "cleanup estimation". Re. including extra
segments contributed by the persisted compaction map I decided to go with a
simple. This allows for offsetting the estimate with a fixed number of bytes.
When the persisted compaction map is used that offset is calculated from the
number of entries in the compaction map.
> Make compaction gain estimate more accurate
> -------------------------------------------
>
> Key: OAK-2939
> URL: https://issues.apache.org/jira/browse/OAK-2939
> Project: Jackrabbit Oak
> Issue Type: Sub-task
> 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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