Re: Experiences with bulk connections

Mon, 23 Oct 2006 20:47:30 -0700 

Dear Trustin,
I traced the stack traces then I found there were many connections closed normally, which could be my test clients' problems and the 'Connection rest' as you mentioned to upgrade my hardware,the followed descriptions are about my hard&soft-ware 
environment.
Linux version 2.6.9-22.ELsmp  (gcc version 3.4.4 20050721 (Red Hat 3.4.4-2))
JDK 1.5.6
MINA 1.0
2 GB RAM
1 Xeon
When I finished my test procedure which means I make the test clients closed then I traced there were no connections bound to my server,when I restart my server then 'Address Already In Use' exception was thrown,by the command 'netstat' I found there are several 
connections stuck in CLOSE_WAIT......
the reuseAddress and unbindAll were both enabled and definitely be invoked in my server...So...It's so wired,which has been troubling me until NOW 
please help me out....
IoAcceptorConfig config = new SocketAcceptorConfig();
config.setDisconnectOnUnbind(true);
config.getFilterChain().addLast("codec",
((SocketAcceptorConfig) config).setReuseAddress(true);
acceptor.bind(new InetSocketAddress(PORT), new ProtocolHandler(),config);
AND for every incoming connection
public void sessionCreated(IoSession session)
{
 if (session.getTransportType() == TransportType.SOCKET)
 {
  ((SocketSessionConfig) session.getConfig()).setReuseAddress(true);
 }
}
----- Original Message ----- From: "Trustin Lee" <[EMAIL PROTECTED]> 
To: <[email protected]>
Sent: Tuesday, October 24, 2006 10:33 AM
Subject: Re: Experiences with bulk connections



Hi James,

On 10/20/06, 凌晨 <[EMAIL PROTECTED]> wrote:
Just yesterday I did almost the same test.Established 1000 connections per second and 20000 at all,every connetion sent small data package as soon as 
connected to register itself to the
server(HashMap<String,Iosession>).During the whole procedure,many a former 
connected IoSession stored in HashMap had been closed abnormally and
unexpectedly and there only no more than
200 connections remained in HashMap at last.I have been revising my codes 


Please give us a few stack traces you've got during the test.  If they are
just regular SocketExceptions like 'connection reset', it's caused by your
O/S or network device and this means we cannot fix it.  You will have to
adjust your O/S parameter or upgrade your hardware.

HTH,
Trustin
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