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https://issues.apache.org/jira/browse/OAK-2849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14716817#comment-14716817
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Alex Parvulescu edited comment on OAK-2849 at 8/27/15 3:21 PM:
---------------------------------------------------------------
I noticed something today related to the SegmentCompactionIT test. I left it
running a bit with 4 writers then I opened it in the Explorer :)
It looks like 1Gb out of the total 4Gb reported size (7.5Gb on disk actually)
is the _:conflict_ node on root. but it looks like many of the nodes have such
a conflict node. [~mduerig] any ideas?
More on conflicts. I see the following structures, which look off to me (2 or
even 3 _:conflict_ nodes on top of each other)
{code}
/root/NW1611/:conflict/deleteDeletedNode/:conflict/deleteChangedNode/NW2379
{code}
or even
{code}
/root/NW1611/:conflict/deleteChangedNode/NW2555/:conflict/changeDeletedNode/NW4793/NW0550/:conflict
{code}
was (Author: alex.parvulescu):
I noticed something today related to the SegmentCompactionIT test. I left it
running a bit with 4 writers then I opened it in the Explorer :)
It looks like 1Gb out of the total 4Gb reported size (7.5Gb on disk actually)
is the _:conflict_ node on root. but it looks like many of the nodes have such
a conflict node. [~mduerig] any ideas?
> 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: 1.3.6
>
> 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.
> 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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