Hi Anton,
Have you looked into the "do_stream" feature of Varnish? This will begin
serving the content to the visitor without waiting for the entire object
to be downloaded and stored in cache. Set in vcl_backend_response.
https://github.com/mattiasgeniar/varnish-4.0-configuration-templates/blob/master/default.vcl
Cheers,
Mark
On Sat, 17 Dec 2016 19:05:48 -0500, Anton Berezhkov
<[email protected]> wrote:
Hello.
Switched to Varnish from Nginx for additional functionality and better
control of handling requests.
But still can't implement what i want. And I want simple behaviour
"Redirect on MISS/PASS".
I want to use VC for deploying quick "cdn" servers for our
mp4-video-servers (used for HTML5 players), without need to store all
files on this quick (ssd, upto 2x480GB space, full database about 6TB).
Currently we have 6 servers with SATA HDDs and hitting iowait like a
trucks :)
Examples:
- Request -> Varnish -> HIT: serve it using Varnish.
- Request -> Varnish -> MISS: start caching data from backend, and
instantly reply to client: `Location: http://backend/$req.url";
- Request -> Varnish -> UPDATE: see `-> MISS` behaviour.
From my perspective, i should do this "detach & reply redirect"
somewhere in `vcl_miss` OR `vcl_backend_fetch`, because if i understood
correctly https://www.varnish-cache.org/docs/4.1/reference/states.html,
i need vcl_backend_response to keep run in background (as additional
thread) while doing return(synth(...)) to redirect user.
Similiar thing is "hitting stale content while object is updating".
But in my case "replying redirect while object is updating".
Also, i pray to implement this without writing additional scripts, why?
I could do external php/ruby checker/cache-pusher with nginx & etc. But
scared by performance downgrade :(
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