Hey, comments inside…
> On 20. Jul 2017, at 08:50, Ronggen Liu <[email protected]> wrote: > > Hello, > > problem: > some connections were lost when there are too many clients were trying to > connect to the server during a short time, for example, send out about 10k > connections during about 3 seconds. > > findings: > as i know, all the connections would be accepted in method doReadMessage of > NioServerSocketChannel, and, in fact, we did find out that some connections > were not accepted from there, but, actually, the TCP have been created > successfully with completed 3-ways handsharke. > meanwhile, we found, to some degree, we can avoid this issue by increasing > the option SO_BACKLOG of ChannelOption, currently, we set it with 8, should > be a little bit low. 8 is most likely a way too low. I would not touch this setting at all if you not want to increase it to a high-number. > > questions: > how to handle this issue? as i know, the client should receive connection > refused error when the number of the connections exceed the SO_BACKLOG, but > the client didn't receive it. No it will not receive a connect refused error but the connection will just timeout. You should check if you block the EventLoop somehow and so not be able to accept fast enough. > > Thanks, > Gary > > -- > You received this message because you are subscribed to the Google Groups > "Netty discussions" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/netty/3f5aae56-1fd6-4e0b-8a6e-cfed66653c1e%40googlegroups.com > > <https://groups.google.com/d/msgid/netty/3f5aae56-1fd6-4e0b-8a6e-cfed66653c1e%40googlegroups.com?utm_medium=email&utm_source=footer>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- You received this message because you are subscribed to the Google Groups "Netty discussions" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/netty/19E5D791-3B6E-4526-9D16-CF0A2574B10B%40googlemail.com. For more options, visit https://groups.google.com/d/optout.
