java.net.ConnectException thrown

[Trustin Lee (이희승)]

I hope this post answers the first question.

http://gleamynode.net/articles/1557/

I'm not sure about the other questions though. :)

— Trustin Lee, http://gleamynode.net/



On Fri, Sep 18, 2009 at 2:37 AM, Michael McGrady
<mmcgrady at topiatechnology.com> wrote:
> 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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