java.net.ConnectException thrown

[J. Mi]

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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