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From Claus Ibsen <claus.ib...@gmail.com>
Subject Re: Memory leak with Message History
Date Thu, 24 Jul 2014 14:00:14 GMT
Hi

Anyone able to see those images? Maybe you can log a JIRA and attach the
images there. Not sure if this mailing list accepts images and embedded
files in mails etc.




On Thu, Jul 24, 2014 at 3:42 PM, Raul Kripalani <raul@evosent.com> wrote:

> Team,
>
> 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 screenshot), 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:
>
> select x from org.apache.camel.impl.DefaultMessageHistory x where
> count(referrers(x)) > 0
>
> returns many objects, which is good.
>
> However, they are referenced by some Object[] which in turn has no
> referrers (!), see screenshot.
>
> Using the "Find nearest GC root" feature yields no results either.
>
> This mysterious Object[] seems to be filled from position 4072 onwards
> (see screenshot), it has 9k+ items... Perhaps some kind of Queue? There are
> many more Object[] arrays storing DefaultMessageHistory instances too.
>
> What's your take?
>
> Have you come across such an issue before?
>
> Someone who is outright familiar with the internal workings of the Message
> History functionality has any clue what's the purpose of this array?
>
> Thanks,
> Raúl.
>
>
> [image: Inline image 3]
>
> [image: Inline image 1]
>
> [image: Inline image 2]
>
> *Raúl Kripalani*
> Apache Camel PMC Member & Committer | Enterprise Architect, Open Source
> Integration specialist
> http://about.me/raulkripalani | http://www.linkedin.com/in/raulkripalani
> http://blog.raulkr.net | twitter: @raulvk
>



-- 
Claus Ibsen
-----------------
Red Hat, Inc.
Email: cibsen@redhat.com
Twitter: davsclaus
Blog: http://davsclaus.com
Author of Camel in Action: http://www.manning.com/ibsen
hawtio: http://hawt.io/
fabric8: http://fabric8.io/

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