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https://issues.apache.org/jira/browse/OAK-5278?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Dürig updated OAK-5278:
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Fix Version/s: 1.7.1
> Improved compaction estimator
> -----------------------------
>
> Key: OAK-5278
> URL: https://issues.apache.org/jira/browse/OAK-5278
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: segment-tar
> Reporter: Michael Dürig
> Labels: gc, operations
> Fix For: 1.8, 1.7.1
>
>
> OAK-4293 introduced a new approach for estimating whether we actually want to
> run or skip a gc cycle. That approach is purely based on the absolute growth
> of the repository's on disk footprint.
> I think this can be further refined as with the {{GCJournal}} we can
> effectively extrapolate the amount of garbage at a given point in time given
> the history of previous gc cycles. E.g. let {{S_n}} be the size of the
> repository and {{G_n}} the percentage of garbage right before the {{n}}-th gc
> cycle. We can then linearly extrapolate the garbage {{G_n+1}} for the
> {{n+1}}-the gc cycle along the repository sizes:
> {code}
> G_n+1 = G_n * (S_k+1 - S_k)/(S_k - S_k-1)
> {code}
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