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Posted to oak-issues@jackrabbit.apache.org by "Michael Dürig (JIRA)" <ji...@apache.org> on 2017/06/27 08:31:00 UTC
[jira] [Commented] (OAK-5790) Chronologically rebase checkpoints on
top of each other during compaction
[ https://issues.apache.org/jira/browse/OAK-5790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16064468#comment-16064468 ]
Michael Dürig commented on OAK-5790:
------------------------------------
Initial implementation at http://svn.apache.org/viewvc?rev=1800027&view=rev
This needs a couple of follow ups still. I'll create issue's as required and mark leave respective FIXME tags in the code referencing these issues.
> Chronologically rebase checkpoints on top of each other during compaction
> -------------------------------------------------------------------------
>
> Key: OAK-5790
> URL: https://issues.apache.org/jira/browse/OAK-5790
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: segment-tar
> Reporter: Michael Dürig
> Assignee: Michael Dürig
> Labels: compaction, gc, performance
> Fix For: 1.8, 1.7.3
>
> Attachments: size over time.png
>
>
> Currently the compactor does just a rewrite of the super root node without any special handling of the checkpoints. It just relies on the node de-duplication cache to avoid fully exploding the checkpoints.
> I think this can be improved by subsequently rebasing checkpoints on top of each other during compaction. (Very much like checkpoints are handled in migration).
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