Too many open files error with Netty

[Trustin Lee (이희승)]

On Wed, Oct 28, 2009 at 1:31 AM, Michael McGrady
<mmcgrady at topiatechnology.com> wrote:
> Just so there is no misunderstanding: this exception is not obviously
> due to the number of connections.  I have not looked in the NioWorker,
> but there is apparently a problem with protecting the HashMap from
> concurrent access.

The ConcurrentModificationException here was caused by my mistake
while trying to fix the reported problem.

— Trustin Lee, http://gleamynode.net/

> MG
>
> On Oct 27, 2009, at 2:30 AM, Trustin Lee (이희승) wrote:
>
>> Could you try r1846?
>>
>> — Trustin Lee, http://gleamynode.net/
>>
>>
>>
>> On Tue, Oct 27, 2009 at 5:42 PM, Albert Strasheim
>> <fullung at gmail.com> wrote:
>>> Hello Trustin
>>>
>>> 2009/10/27 Trustin Lee (이희승) <trustin at gmail.com>:
>>>> I've just checked in the fix.  The number of open files will not
>>>> exceed (the number of open channels) + 128 * (the number of active
>>>> ChannelFactories).
>>>
>>> I just tested with revision 1842 from Netty SVN, but there still
>>> seems
>>> to be a problem.
>>>
>>> After about 78000 connections on our Solaris box, I got the
>>> following:
>>>
>>> Oct 27, 2009 10:39:12 AM org.jboss.netty.channel.socket.nio.NioWorker
>>> WARNING: Unexpected exception in the selector loop.
>>> java.util.ConcurrentModificationException
>>>        at java.util.HashMap$HashIterator.nextEntry(HashMap.java:848)
>>>        at java.util.HashMap$KeyIterator.next(HashMap.java:883)
>>>        at
>>> org
>>> .jboss
>>> .netty
>>> .channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:269)
>>>        at
>>> org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:196)
>>>        at
>>> org
>>> .jboss
>>> .netty.util.internal.IoWorkerRunnable.run(IoWorkerRunnable.java:46)
>>>        at java.util.concurrent.ThreadPoolExecutor
>>> $Worker.runTask(ThreadPoolExecutor.java:886)
>>>        at java.util.concurrent.ThreadPoolExecutor
>>> $Worker.run(ThreadPoolExecutor.java:908)
>>>        at java.lang.Thread.run(Thread.java:619)
>>>
>>> Watching the heap in Visual VM also seems to indicate that it keeps
>>> growing.
>>>
>>> Regards,
>>>
>>> Albert
>>>
>>> P.S. Code attached again.
>>>
>>> _______________________________________________
>>> netty-users mailing list
>>> netty-users at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/netty-users
>>>
>>>
>>
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>
> Mike McGrady
> Principal Investigator AF081-028 AFRL SBIR
> Senior Engineer
> Topia Technology, Inc
> 1.253.720.3365
> mmcgrady at topiatechnology.com
>
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