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From "Stefan Egli (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-2557) VersionGC uses way too much memory if there is a large pile of garbage
Date Tue, 10 Mar 2015 17:59:38 GMT

    [ https://issues.apache.org/jira/browse/OAK-2557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14355322#comment-14355322
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Stefan Egli commented on OAK-2557:
----------------------------------

{{<feature-creep-warning>}}
we could make the VersionGC play nicely to existing load on the system: it could progress
slower if the load is higher and vice-verca. One simple measure could be: if the observation
queue is small (eg below 10) then the load is low and it could progress full-speed. Otherwise
it could add some artificial sleeping in between.
{{</feature-creep-warning>}}

> VersionGC uses way too much memory if there is a large pile of garbage
> ----------------------------------------------------------------------
>
>                 Key: OAK-2557
>                 URL: https://issues.apache.org/jira/browse/OAK-2557
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: core, mongomk
>    Affects Versions: 1.0.11
>            Reporter: Stefan Egli
>            Assignee: Chetan Mehrotra
>            Priority: Blocker
>             Fix For: 1.0.13, 1.2
>
>         Attachments: OAK-2557.patch
>
>
> It has been noticed that on a system where revision-gc (VersionGarbageCollector of mongomk)
did not run for a few days (due to not interfering with some tests/large bulk operations)
that there was such a large pile of garbage accumulating, that the following code
> {code}
> VersionGarbageCollector.collectDeletedDocuments
> {code}
> in the for loop, creates such a large list of NodeDocuments to delete (docIdsToDelete)
that it uses up too much memory, causing the JVM's GC to constantly spin in Full-GCs.



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