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https://issues.apache.org/jira/browse/OAK-3350?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Dürig updated OAK-3350:
-------------------------------
Labels: compaction gc scalability (was: compaction gc)
> Incremental compaction
> ----------------------
>
> Key: OAK-3350
> URL: https://issues.apache.org/jira/browse/OAK-3350
> Project: Jackrabbit Oak
> Issue Type: New Feature
> Components: segment-tar
> Reporter: Michael Dürig
> Assignee: Michael Dürig
> Labels: compaction, gc, scalability
> Fix For: 1.8
>
>
> This is OAK-3349 taken to the extreme: given a segment that is almost not
> referenced any more we could just rewrite the still referenced content. That
> is, say a segment contains two properties reachable from the current root
> node state and all its remaining content is not reachable from the root node
> state. In that case we could rewrite these two properties and create a new
> root node state referencing the rewritten properties. This would effectively
> make the segment eligible for being gc-ed.
> Such an approach would start from segments that are sparse and compact these
> instead of compacting everything as we currently do, which might cause a lot
> of copying around stuff that already is compact. The challenging part here is
> probably finding the segments that are sparse as this involves inverting the
> reference graph.
> Todo: Asses feasibility and impact, implement prototype.
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