Problem request_timeout not working with proxy_next_upstream on proxy_connect_timeout but proxy_read_timeout

[Maxim Dounin]

Hello!

On Wed, Mar 06, 2013 at 05:28:12AM -0500, yvlasov wrote:

> Hello
> In our setup we have an NGNX  as front-end and several back-end.
> The problem is our load profile, we have a lot of simple and fast http
> requests, and very few but very heavy in terms of time and BE cpu requests.
> 
> So my idea is to use proxy_next_upstream for simple request as usual and it
> works perfectly.
> And for heavy requests based on URL I want to passthrough it to BE with
> lowest CPU load by specifying small proxy_connect_timeout and using
> proxy_next_upstream timeout.
> But in case of all system overload with heavy requests i don't want them to
> travel through all BEs because of proxy_read_timeout is about 1 minute.
> I was hoping to set a request_timeout to the same value as
> proxy_read_timeout and from my point of view this should prevent heavy
> requests to travel all upstreams based on proxy_read_timeout, but they do.
> 
> I ve found a similar topic but the proposition was to make two new options
> to proxy_next_upstream such as timeout_tcp timeout_http or something
> similar.
> 
> Thanks for your future advices and comments.

I think that some aggregate upstream timeout, which will prevent 
switch to a next upstream server if passed, whould be better 
solution to this problem.

-- 
Maxim Dounin
http://nginx.org/en/donation.html