dev@grizzly.java.net

Re: ConcurrentModificationException

From: Tigran Mkrtchyan <tigran.mkrtchyan_at_desy.de>
Date: Fri, 15 Jan 2010 13:00:46 +0100

Hi Alexey,

On 01/15/2010 12:04 PM, Oleksiy Stashok wrote:
> Hi Tigran,
>
> I'd probably need more details on that.
> Do you know what was the reason of OOM?

I hope wrong config option. It looks like we need 3 GB of memory while
only 1GB was configured.
Since config change looks more stable.

> ConcurrentModificationException exception occurred after you got OOM
> during server stopping?
ConcurrentModificationException occurred after OOM. There was some
others as well. In addition
UDP listener was gone and probably clients as well:

java.nio.channels.ClosedChannelException
         at
sun.nio.ch.DatagramChannelImpl.ensureOpen(DatagramChannelImpl.java:107)
         at
sun.nio.ch.DatagramChannelImpl.send(DatagramChannelImpl.java:216)
         at
com.sun.grizzly.util.OutputWriter.flushChannel(OutputWriter.java:295)
         at
com.sun.grizzly.util.OutputWriter.flushChannel(OutputWriter.java:256)

But OOM was the first one.

Regards,
    Tigran.

>
> Thanks.
>
> WBR,
> Alexey.
>
> On Jan 15, 2010, at 9:17 , Tigran Mkrtchyan wrote:
>
>>
>> Hi,
>>
>>
>> java.util.ConcurrentModificationException
>> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
>> at java.util.HashMap$KeyIterator.next(HashMap.java:828)
>> at
>> com.sun.grizzly.SelectorHandlerRunner.handleSelectedKeys(SelectorHandlerRunner.java:255)
>>
>> at
>> com.sun.grizzly.SelectorHandlerRunner.continueSelect(SelectorHandlerRunner.java:154)
>>
>> at
>> com.sun.grizzly.SelectorHandlerRunner.run(SelectorHandlerRunner.java:114)
>>
>> at
>> com.sun.grizzly.util.FixedThreadPool$BasicWorker.dowork(FixedThreadPool.java:379)
>>
>> at
>> com.sun.grizzly.util.FixedThreadPool$BasicWorker.run(FixedThreadPool.java:360)
>>
>> at java.lang.Thread.run(Thread.java:619)
>>
>>
>> This is grizzly 1.9.19-SNAPSHOT. The exception popup after we got out
>> of memory exception.
>>
>> Regards,
>> Tigran.
>>
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>
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