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https://issues.apache.org/jira/browse/OAK-3479?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14944761#comment-14944761
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Michael Dürig commented on OAK-3479:
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Patch looks good.
bq. newly formed SegmentIds can be assigned the current generation
I experimented with something along these lines earlier and found in very
tricky to catch the right generation. The problem is with segments generated by
compaction itself, re-loading of older segments etc. But still think its worth
to take another stab at this.
> Add generation info to compaction map
> -------------------------------------
>
> Key: OAK-3479
> URL: https://issues.apache.org/jira/browse/OAK-3479
> Project: Jackrabbit Oak
> Issue Type: Technical task
> Components: segmentmk
> Reporter: Alex Parvulescu
> Assignee: Alex Parvulescu
> Priority: Minor
> Labels: cleanup, compaction, gc
> Fix For: 1.3.8
>
> Attachments: OAK-3479.patch
>
>
> I'd like to add a counter that exposes the current generation of the
> compaction map, (meaning the number of compaction cycles).
> So far I've been using the CompactionMap#getDepth as a heuristic but if you
> run long enough some old generations will be dropped decreasing the depth,
> making it unreliable as a generation counter.
> I don't want to persist this info, just start at 0 once the system starts up
> and increase on each CompactionMap#cons call.
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