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From "Claus Ibsen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CAMEL-7635) Memory leak in Message History feature
Date Thu, 24 Jul 2014 14:26:39 GMT

    [ https://issues.apache.org/jira/browse/CAMEL-7635?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14073235#comment-14073235
] 

Claus Ibsen commented on CAMEL-7635:
------------------------------------

So does none of the DefaultMessageHistory have any data, eg are they all empty for routeId,
and the other fields?



> Memory leak in Message History feature
> --------------------------------------
>
>                 Key: CAMEL-7635
>                 URL: https://issues.apache.org/jira/browse/CAMEL-7635
>             Project: Camel
>          Issue Type: Bug
>          Components: camel-core
>    Affects Versions: 2.13.1
>         Environment: Apache ServiceMix 5.1.0 w/ Camel 2.13.1
> JDK 7
>            Reporter: Raúl Kripalani
>         Attachments: image1.png, image2.png, image3.png
>
>
> We just had an OOM incident in our dev environments after upgrading from Camel 2.10.3
to 2.13.1. Heap settings have remained untouched.
> A heap dump showed millions of DefaultMessageHistory instances retained (see [^image1.png]),
along with their corresponding Date and StopWatch instances. Obviously our first solution
will be to disable message history in all contexts.
> Digging deeper, I'm utterly confused because I don't seem to find the GC roots that are
keeping these objects alive.
> OQL query for VisualVM:
> {code}
> select x from org.apache.camel.impl.DefaultMessageHistory x where count(referrers(x))
> 0
> {code}
> returns many objects, which is good.
> However, they are referenced by some Object[] which in turn has no referrers (!), see
[^image2.png].
> Using the "Find nearest GC root" feature yields no results either.
> This mysterious Object[] seems to be filled from position 4072 onwards (see [^image3.png]),
it has 9k+ items... Perhaps some kind of Queue? There are many more Object[] arrays storing
DefaultMessageHistory instances too.



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