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From Michael Dürig (JIRA) <j...@apache.org>
Subject [jira] [Commented] (OAK-2849) Improve revision gc on SegmentMK
Date Wed, 16 Dec 2015 09:33:46 GMT

    [ https://issues.apache.org/jira/browse/OAK-2849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15059747#comment-15059747

Michael Dürig commented on OAK-2849:

Linking OAK-3797 here as this might also have some impact on revision gc through the {{SegmentId}}
instances being retained. 

> Improve revision gc on SegmentMK
> --------------------------------
>                 Key: OAK-2849
>                 URL: https://issues.apache.org/jira/browse/OAK-2849
>             Project: Jackrabbit Oak
>          Issue Type: Epic
>          Components: segmentmk
>            Reporter: Michael Dürig
>            Assignee: Michael Dürig
>              Labels: candidate_oak_1_0, candidate_oak_1_2, compaction, gc
>             Fix For: 1.4
>         Attachments: SegmentCompactionIT-conflicts.png
> This is a container issue for the ongoing effort to improve revision gc of the SegmentMK.

> I'm exploring 
> * ways to make the reference graph as exact as possible and necessary: it should not
contain segments that are not referenceable any more and but must contain all segments that
are referenceable. 
> * ways to segregate the reference graph reducing dependencies between certain set of
segments as much as possible. 
> * Reducing the number of in memory references and their impact on gc as much as possible.

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