Dynamic clients

Peter Nixon listuser at peternixon.net
Sat Jun 14 17:21:08 CEST 2008

Nice work!


On Sat 14 Jun 2008, Alan DeKok wrote:
> Arran Cudbard-Bell wrote:
> > Wow this is such a neat way of doing it. Don't reload the entire client
> > table every time there's an update, just provide provision for bringing
> > new clients into the list dynamically
>   Yup.
> > until we get a chance to reload the client list properly.
>   Nope.  If they client is loaded dynamically, it's in the list
> "properly".  There is no difference between clients loaded at boot time
> and clients loaded dynamically, other than a few entries in the "client"
> data structure.
> > Hmm... though because we see such large startup times when loading in
> > clients from SQL, it'd be nice to be able to turn that DoS protection
> > off, and just run the whole setup using dynamic clients, I dare say it'd
> > save quite a bit of memory too (currently loading 600+ NAS).
>   The main problem right now is that the SQL lookups (or whatever) are
> done in the main server thread.  i.e. until the lookups finish, ALL new
> requests are ignored.  This is bad, but not catastrophic if your SQL
> servers are up.
>   If the SQL servers are down, bad things can happen, like large
> timeouts, and maybe lost packets.
>   Once I get the dynamic client lookups pushed to a child thread, the
> main worker thread can go back to processing other packets.  I can then
> relax some of the DoS provisions.
> > Did you include client assignment to virtual-servers, I don't see an
> > attribute listed in the example...?
>   Yes.  It's in the "update" section that isn't doing SQL lookups.
>   Alan DeKok.
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Peter Nixon

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