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From Michael Dürig (JIRA) <j...@apache.org>
Subject [jira] [Updated] (OAK-2849) Improve revision gc on SegmentMK
Date Wed, 16 Dec 2015 14:59:46 GMT

     [ https://issues.apache.org/jira/browse/OAK-2849?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael Dürig updated OAK-2849:
-------------------------------
    Fix Version/s:     (was: 1.4)

> 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
>         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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