Hi Ronan, It'd also be worth getting output from varnishlog for that broken request if possible. I realise it could be difficult to isolate it though.
Thanks, Sam ------Original Message------ From: Ronan Mullally To: Sam Crawford Cc: [email protected] Subject: Re: Varnish 503ing on ~1/100 POSTs Sent: 5 Apr 2011 16:49 Hi Sam, On Tue, 5 Apr 2011, Sam Crawford wrote: > I suspect you are right - Apache may be discarding the connection as you > are sending the POST request, resulting in the 503. Incidentally, what > are your Apache keep-alive settings? If I remember rightly, there is a > KeepAliveTimeout (which it sounds like you've been using) and also a > KeepAlive parameter (which controls the maximum number of requests on > one TCP connection, irrespective of timeouts). I've got the number of requests per session set high (thousands). The number of actual back-end requests is modest (10-20 per back-end per second at most) so it won't hit that limit often. > 1) If you disable keepalives completely at Apache, does the problem > disappear? Not entirely. I did this eariler in the process but still saw occurances (not as many as I saw with the Apache Keepalive timeout = 1, but not significantly fewer than when it was = 5 either). I've disabled keepalives again and will run with it that way overnight, so far it looks like more of the same - I've seen one occurance in about 2000 POSTs. -Ronan Sent from my BlackBerry® wireless device _______________________________________________ varnish-misc mailing list [email protected] http://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc
