[jira] [Commented] (OAK-2849) Improve revision gc on SegmentMK

["Michael Dürig (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OAK-2849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14532516#comment-14532516 ] 

Michael Dürig commented on OAK-2849:
------------------------------------

OAK-2845 impacted gc in the presence of observation listeners as unregistering a listener would leak a reference to a node state forever thus effectively blocking gc for the respective segment and all its dependencies. 

> Improve revision gc on SegmentMK
> --------------------------------
>
>                 Key: OAK-2849
>                 URL: https://issues.apache.org/jira/browse/OAK-2849
>             Project: Jackrabbit Oak
>          Issue Type: Task
>          Components: segmentmk
>            Reporter: Michael Dürig
>            Assignee: Michael Dürig
>              Labels: compaction, gc
>             Fix For: 1.3.0
>
>
> 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.
> Work in progress is in my private [Github fork|https://github.com/mduerig/jackrabbit-oak]. As soon as something is promising enough to make it into Oak, I spawn of an issue an make it a subtask of this task. 



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