mirror delay

[Eylon Saadon]

HI,
when adding
keepalive_timeout 0;
to the main location it works fine.
even if the mirrored location doesn't respond immediately the latency
doesn't go up.

is this the solution for the issue or just a way to understand the issue?

Thanks,
     Eylon Saadon

On Thu, Aug 30, 2018 at 5:28 PM Roman Arutyunyan <arut at nginx.com> wrote:

> Hi,
>
> On Thu, Aug 30, 2018 at 05:19:53PM +0300, Eylon Saadon wrote:
> > hi,
> > thanks for the quick response!
> > I'm not using sendfile or tcp_nopush.
> > just to make sure. I should disable the keepalive for the mirror
> location.
> > and do it like so?
>
> No, for the primary location.  This will help us understand the reason
> why you have the delay.
>
> > server {
> >
> >   resolver 8.8.8.8;
> >
> >   listen 80;
> >
> >   location / {
> >     proxy_set_header Host $host;
> >     proxy_pass http://server:9000;
> >   }
> >
> >   location /mirror {
> >     internal;
> >     keepalive_timeout 0;
> >     proxy_pass https://test_server$request_uri;
> >   }
> > }
> >
> >
> > Thanks,
> >
> >     eylon saadon
> >
> >
> > On Thu, Aug 30, 2018 at 4:52 PM Roman Arutyunyan <arut at nginx.com> wrote:
> >
> > > Hi,
> > >
> > > On Thu, Aug 30, 2018 at 04:34:29PM +0300, Eylon Saadon wrote:
> > > > Hi,
> > > > I'm using the mirror module in my "production" nginx in order to
> mirror
> > > > real traffic to a test envrionment.
> > > > I don't want this mirroring to affect the latency of the production
> > > > environment, but it looks like the nginx is waiting for the response
> from
> > > > the test environment.
> > > > is there a way to avoid this? I just want the request to get to the
> test
> > > > environment and let it process it. but it shouldn't wait fo r the
> > > response
> > > > from the test environment in order to respond to the request
> > >
> > > Usually a mirror subrequest does not affect the main request.  However
> > > there
> > > are two issues with mirroring:
> > >
> > > - the next request on the same connection will not be processed until
> all
> > > mirror subrequests finish.  Try disabling keepalive and see if it
> helps.
> > >
> > > - if you use sendfile and tcp_nopush, it's possible that the response
> is
> > > not
> > > pushed properly because of a mirror subrequest, which may result in a
> > > delay.
> > > Turn off sendfile and see if it helps.
> > >
> > > --
> > > Roman Arutyunyan
> > > _______________________________________________
> > > nginx mailing list
> > > nginx at nginx.org
> > > http://mailman.nginx.org/mailman/listinfo/nginx
> > >
> >
> >
> > --
> > Thanks,
> >       Eylon Saadon
>
> > _______________________________________________
> > nginx mailing list
> > nginx at nginx.org
> > http://mailman.nginx.org/mailman/listinfo/nginx
>
>
> --
> Roman Arutyunyan
> _______________________________________________
> nginx mailing list
> nginx at nginx.org
> http://mailman.nginx.org/mailman/listinfo/nginx
>


-- 
Thanks,
      Eylon Saadon
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