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https://issues.apache.org/jira/browse/OAK-3603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14996622#comment-14996622
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Alex Parvulescu commented on OAK-3603:
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this depends on a stable set or referenced ids, so we'd need to fix OAK-3602
first.
> Evaluate skipping cleanup of a subset of tar files
> --------------------------------------------------
>
> Key: OAK-3603
> URL: https://issues.apache.org/jira/browse/OAK-3603
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: segmentmk
> Reporter: Alex Parvulescu
> Assignee: Alex Parvulescu
>
> Given the fact that tar readers are immutable (we only create new generations
> of them once they reach a certain threshold of garbage) we can consider
> coming up with a heuristic for skipping cleanup entirely for consequent
> cleanup calls based on the same referenced id set (provided we can make this
> set more stable, aka. OAK-2849).
> Ex: for a specific input set a cleanup call on a tar reader might decide that
> there's no enough garbage (some IO involved in reading through all existing
> entries). if the following cleanup cycle would have the exact same input, it
> doesn't make sense to recheck the tar file, we already know cleanup can be
> skipped, moreover we can skip the older tar files too, as their input would
> also not change. the gains increase the larger the number of tar files.
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