java.net.ConnectException thrown

[Michael McGrady]

What is the impact of changing these settings?  Why is the default low  
instead of hight?  And, any other questions I should be asking before  
changing this configuration?

MIke

On Sep 17, 2009, at 10:34 AM, J. Mi wrote:

> H Thomas,
>
> Thanks for the lead. To be able to have more connections before  
> seeing "java.net.ConnectException: Connection refused...", which  
> configuration I need to change in /etc/security/limits.conf? I added
> * soft nofile 20000
> * hard nofile 20000
>
> and first time just tried to re-login, the new limit didn't work for  
> me for more connections. I then tried to restart my VMware. It still  
> didn't work for me
>
> Does 'nofile' (max number of open files) have anything to do with  
> socket connections?
>
> Appreciate if you or anyone else can guide me more on this.
> btw, if any of you know any equivalent OS settings on Windows, i'll  
> try that as well.
>
> Jason
>
>
>
> On Wed, Sep 16, 2009 at 3:38 PM, Thomas Bocek <bocek at ifi.uzh.ch>  
> wrote:
> Hi J.,
>
> This might be a limitation of the OS. If you are using for example
> Linux, then you can only open about 1000 connections before seeing  
> "too
> many open files in system" error messages. You can adjust the value in
> /etc/security/limits.conf
>
> Thomas
>
> J. Mi wrote:
> > All,
> >
> > I get following exception pretty consistently when trying to  
> concurrently
> > connect about 800 connections.
> >
> > Any idea? Is this something out of Netty's control? If so, is  
> there some
> > configuration I could do to JVM or operating system to increase  
> resource
> > capacity?
> >
> > Thanks,
> > Jason
> >
> > java.net.ConnectException: Connection refused: no further  
> information
> >         at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
> >         at sun.nio.ch.SocketChannelImpl.finishConnect(Unknown  
> Source)
> >         at
> > org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink 
> $Boss.connect(NioClientSocketPipelineSink.java:381)
> >         at
> > org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink 
> $Boss.processSelectedKeys(NioClientSocketPipelineSink.java:351)
> >         at
> > org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink 
> $Boss.run(NioClientSocketPipelineSink.java:273)
> >         at
> >  
> org 
> .jboss 
> .netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java: 
> 113)
> >         at
> >  
> org 
> .jboss 
> .netty.util.internal.IoWorkerRunnable.run(IoWorkerRunnable.java:53)
> >         at java.util.concurrent.ThreadPoolExecutor 
> $Worker.runTask(Unknown
> > Source)
> >         at java.util.concurrent.ThreadPoolExecutor 
> $Worker.run(Unknown
> > Source)
> >         at java.lang.Thread.run(Unknown Source)
> >
> >
> >
> >  
> ------------------------------------------------------------------------
> >
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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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