Recommendations for server process with thousands of listening ports?

[Vassilis Bekiaris]

Hi!

recently (on another unrelated thread) an issue came up with failure to 
open sockets due to the limit of file descriptors available per user per 
process (this was on Ubuntu linux IIRC), could this be your case? Check 
this article by Trustin for further reading:

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

Cheers,
Vassilis

On 23/06/2011 1:14 , Jordan Sissel wrote:
> Howdy :)
>
> I have a service that currently listens on thousands of tcp and udp 
> ports (for different channels of data); due to various problems, I am 
> rewriting it in Java and decided to use Netty.
>
> I've tried a few different ways of doing things -
>
> First, one NioServerSocketChannelFactory (or 
> NioDatagramChannelFactory) per listening port. Problem is, after a few 
> thousand server channels (via ConnectionlessBootstrap and 
> ServerBootstrap), I get OOM while creating threads.
>
> Second, one NioServerSocketChannelFactory shared across all TCP server 
> ports and one NioDatagramChannelFactory for all UDP server ports. 
> Problem here is that after about a few hundred open sockets with error 
> "org.jboss.netty.channel.ChannelException: Failed to bind to: 
> /0.0.0.0:15725 <http://0.0.0.0:15725>" - watching strace shows bind(2) 
> successfully bind on this port, for example, so the cause is not a 
> bind specific failure. Trolling the logs, I see about 911 successful 
> TCP server sockets before tcp fails with this message
>
> I am using NioServerSocketChannelFactory with 
> Executors.newCachedThreadPool().
>
> I can try to make some standalone code that reproduces this behavior 
> for further study, but if there's anything obvious I'm missing, please 
> let me know.
>
> -Jordna
>
>
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