Re: The TCP brownout - i.e. loosing messages problem

On 12/3/09 7:46 AM, Damjan wrote:
> I beleive the problem is widely known by now.
> 
> That is, if a user sudenly get's disconnected of the internet - like if
> the power goes out, or he suspends his laptop, his router dies, etc. - his
> TCP session with the XMPP server stays lingering for a posible long time
> (afaik max is up to 2hours?).
> 
> For that time the XMPP server thinks the user is online and will route
> messages to him, until the TCP stack in the OS notices the problem. 
> 
> These messages will be *lost*!
> 
> 
> So my question is two-fold,
> 
> 1. what are admins doing to prevent this, or at least limit the loss of
>    messages
> 1.1. more specifically, I'm using ejabberd on Linux, so that's what I'm
>      most intereseted in
> 2. Is there a plan to somehow enhance the XMPP protocol to better handle
>    this case? Getting a message twice would be much preferable to
>    loosing it.
> 
> 
> ps.
> I have a crazy idea that a user-space TCP stack could help so that
> the XMPP server will actually know what packets have reached the user,
> so that it could queue the XMPP messages until all packets are ACKed.

http://xmpp.org/extensions/xep-0198.html

We're waiting for implementations.

Peter

-- 
Peter Saint-Andre
https://stpeter.im/

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