I've done a bit more research. I found these two links.
http://developer.java.sun.com/developer/bugParade/bugs/4420157.html
http://developer.java.sun.com/developer/bugParade/bugs/4447092.html
I like the part that says
"Furthermore, such a mechanism would be unlikely to address the primary focus of
4420157, which is that the RMI TCP transport does not make enough of an effort
to overcome [i]the limitations of certain OS's[/i] TCP maximum listen backlog sizes."
Regards,
Adrian
> Hi,
>
> Quite a few people have reported a problem with
> connection refused on windows when you hit JBoss
> with
> lots of requests all at the same time.
> Its bizarre, I don't see this problem on Linux.
>
> I've tracked the problem to the way ServerSockets
> are
> handled.
>
> Parts of jboss does something like:
>
> public void run()
> {
> socket = ServerSocket.accept();
> listen();
> doWork(socket);
> }
> public void listen()
> {
> Thread thread = new Thread(this);
> thread.start();
> }
>
> But if you do the following the connection refused
> mostly goes away.
>
> public void run()
> {
> while(true)
> {
> socket = serverSocket.accept();
> Thread thread = new Thread(new Worker(socket));
> thread.start();
> }
> }
> In my testing there is still a problem on windows
> right at the very start when the work is intensive.
> It looks like the JIT kicks in and the thread
> doing the serverSocket.accept() doesn't get chance
> to run before the backlog queue fills up.
> The problem goes away after the first few requests.
>
> org.jnp.server.Main does exactly what I've written
> above.
> Some thread pooling would be nice :-)
>
> I would like somebody else to verify my analysis.
> I don't want to change what's working if the
> problem is really elsewhere.
> Regards,
> Adrian
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