mirror delay

[Eylon Saadon]

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?

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
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>


-- 
Thanks,
      Eylon Saadon
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