Hi Stephan, On Wed, 9 Mar 2011, Caunter, Stefan wrote:
> I don't think pass or pipe is the issue. 503 means the backend can't > answer, and calling pipe won't change that. > Set up a "patient" back end; you can collect your back ends into a > patient director. Ah, the penny drops. I was thinking of "patient" in the context of health checks (ie a sick backend). I'll give it a go, but my gut feeling is that the backends aren't at fault. I'm seeing this error when they are both backends lightly loaded (load average around 1 on an 8 core box), and the rate of incidence does not appear to be related to the load - I actually saw a slightly lower rate (under 1%) last night when utilisation was higher, and as I said previously when I used pound instead of varnish this wasn't a problem. I'll try the patient backend and keep a close eye on the error rate vs utilisation over the next few days. Thanks for your help. -Ronan > -----Original Message----- > >From: [email protected] > [mailto:[email protected]] On Behalf Of Ronan > Mullally > Sent: March-08-11 5:32 PM > To: Stewart Robinson > Cc: [email protected] > Subject: Re: Varnish 503ing on ~1/100 POSTs > > On Tue, 8 Mar 2011, Stewart Robinson wrote: > > > Whilst this may not be a fix to a possible bug in varnish have you > tried > > switching posts to pipe instead of pass? > > This might well help, but I'd have no way of knowing for sure. The > backend servers indicate the requests via varnish are processed > correctly. > I'm not able to reproduce the problem at will so I'd be relying on user > feedback to determine if the problem still occurs and that's unreliable > at > best. > > It is of course better than having the problem occur, but I'd rather > take > the opportunity to try and get to the bottom of it while I can. I only > deployed varnish a couple of days ago. The site will be fairly quiet > until the end of the week. I'll resort to pipe if I've not got a fix by > then. > > > -Ronan > > _______________________________________________ > varnish-misc mailing list > [email protected] > http://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc > > _______________________________________________ varnish-misc mailing list [email protected] http://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc
