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From "Kristian Waagan (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-5457) Memory is not freed after OutOfMemoryError, thus preventing Derby from recovering
Date Thu, 13 Oct 2011 08:47:12 GMT

     [ https://issues.apache.org/jira/browse/DERBY-5457?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kristian Waagan updated DERBY-5457:
-----------------------------------

      Component/s: Network Server
    Fix Version/s: 10.9.0.0

Great, thanks for taking the time to test it.
There may be cases where the cleanup fails due to too high memory pressure, but it's good
to hear that it's working in the general case.
                
> Memory is not freed after OutOfMemoryError, thus preventing Derby from recovering
> ---------------------------------------------------------------------------------
>
>                 Key: DERBY-5457
>                 URL: https://issues.apache.org/jira/browse/DERBY-5457
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Server
>    Affects Versions: 10.6.2.1
>         Environment: Derby Server 10.6.2.1 on Windows 7 with Derby JDBC Client 10.6.2.1
connections. Client uses OpenJPA as ORM Provider
>            Reporter: Dominik Stadler
>              Labels: memory
>             Fix For: 10.8.2.2, 10.9.0.0
>
>         Attachments: GC Root of the object that keeps all the memory.jpg, One instance
of RAMTransaction keeps 700M.jpg
>
>
> After some uptime, my Derby Server goes OOM with the following errors:
> {quote}
> 2011-10-03 10:35:21.002 GMT : Security manager installed using the Basic server security
policy.
> 2011-10-03 10:35:23.295 GMT : Apache Derby Network Server - 10.6.2.1 - (999685) started
and ready to accept connections on port 11527
> Exception in thread "DRDAConnThread_12" java.lang.OutOfMemoryError: Java heap space
> Exception in thread "NetworkServerThread_2" java.lang.OutOfMemoryError: GC overhead limit
exceeded
> Exception in thread "DRDAConnThread_3" java.lang.OutOfMemoryError: GC overhead limit
exceeded
> {quote}
> I suspect that I create transactions that are too big, so the OOM is not really of concern
to me here untill I have investigated the actual cause. 
> However I would expect the Derby Server to recover from this situation as soon as the
connection to the Client application is closed, but this does not seem to happen, I have memory
dumps from a point in time when the Client was already closed and they show that there are
still large instances of RAMTransaction kept in memory. 
> I will attach screenshots from MAT which shows the memory usage and the objects keeping
this in memory, please adjust handling of OOM so that the memory is freed here.

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