[
https://issues.apache.org/jira/browse/OAK-2849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14532542#comment-14532542
]
Michael Dürig commented on OAK-2849:
------------------------------------
Long running sessions that never refresh impact gc because they hold onto old
node states blocking the associated segment and its dependencies from getting
collected.
https://github.com/mduerig/jackrabbit-oak/commit/16ad56e843ae3c6e9cf5e7d4be51033b3fdc152f
introduces experimental support for refreshing all open sessions through the
{{RepositoryManagementMBean}}. This allows to asses the impact of refreshing
sessions before running gc.
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
