Re: Varnish Prefetch
In message <75cf5801002010157ybf03f32v3223260dc...@mail.gmail.com>, Paras F adte writes: >Any work around possible in varnish to make varnish check objects at backend >some time before they actually reach their expires time? Or is it just not >possible to do so in varnish? We have a facility called 'grace' that does pretty much the same thing, just slightly different. Good explanation here: http://overstimulate.com/articles/varnish-getting-started -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: Varnish Prefetch
Hi Poul, Any work around possible in varnish to make varnish check objects at backend some time before they actually reach their expires time? Or is it just not possible to do so in varnish? Thank you. -Paras On Fri, Jan 29, 2010 at 10:07 AM, Paras Fadte wrote: > Thanks for the response Poul. > > > > On Fri, Jan 29, 2010 at 3:49 AM, Poul-Henning Kamp wrote: > >> In message <75cf5801001270025s722f114ax9335dba334a84...@mail.gmail.com>, >> Paras >> Fadte writes: >> >> >Thanks for the response . So with grace mode is it possible to fetch an >> >object from backend about "x" seconds before its "expires" time is >> reached ? >> >> >> No, sorry. >> >> -- >> Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 >> p...@freebsd.org | TCP/IP since RFC 956 >> FreeBSD committer | BSD since 4.3-tahoe >> Never attribute to malice what can adequately be explained by >> incompetence. >> > > ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: Varnish Prefetch
Thanks for the response Poul. On Fri, Jan 29, 2010 at 3:49 AM, Poul-Henning Kamp wrote: > In message <75cf5801001270025s722f114ax9335dba334a84...@mail.gmail.com>, > Paras > Fadte writes: > > >Thanks for the response . So with grace mode is it possible to fetch an > >object from backend about "x" seconds before its "expires" time is reached > ? > > > No, sorry. > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > p...@freebsd.org | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence. > ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: Varnish Prefetch
In message <75cf5801001270025s722f114ax9335dba334a84...@mail.gmail.com>, Paras Fadte writes: >Thanks for the response . So with grace mode is it possible to fetch an >object from backend about "x" seconds before its "expires" time is reached ? No, sorry. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: Varnish Prefetch
Hi Tollef, Thanks for the response. -Paras On Mon, Jan 25, 2010 at 2:57 PM, Tollef Fog Heen wrote: > ]] Paras Fadte > > | Is prefetch by default enabled in varnish ? > > No, it is not implemented and any references to it should be ignored. > It is also removed in trunk. > > -- > Tollef Fog Heen > Redpill Linpro -- Changing the game! > t: +47 21 54 41 73 > ___ > varnish-misc mailing list > varnish-misc@projects.linpro.no > http://projects.linpro.no/mailman/listinfo/varnish-misc > ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: Varnish Prefetch
Hi Poul, Thanks for the response . So with grace mode is it possible to fetch an object from backend about "x" seconds before its "expires" time is reached ? Thank you. -Paras On Mon, Jan 25, 2010 at 2:14 PM, Poul-Henning Kamp wrote: > In message <75cf5801001241820w3e4afd34v64ad2031b8b7...@mail.gmail.com>, > Paras Fadte writes: > > >> Is prefetch by default enabled in varnish ? > > Prefetch never got implemented, we found other ideas to solve the problem, > such as grace mode. > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > p...@freebsd.org | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence. > ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: Varnish Prefetch
]] Paras Fadte | Is prefetch by default enabled in varnish ? No, it is not implemented and any references to it should be ignored. It is also removed in trunk. -- Tollef Fog Heen Redpill Linpro -- Changing the game! t: +47 21 54 41 73 ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: Varnish Prefetch
In message <75cf5801001241820w3e4afd34v64ad2031b8b7...@mail.gmail.com>, Paras Fadte writes: >> Is prefetch by default enabled in varnish ? Prefetch never got implemented, we found other ideas to solve the problem, such as grace mode. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: Varnish Prefetch
Can anybody please respond to this query ?
Thank you.
On Fri, Jan 22, 2010 at 11:02 AM, Paras Fadte wrote:
> Hi,
>
> Is prefetch by default enabled in varnish ? I have following in VCL . A
> value of -30 seconds would mean that the object would be checked 30 seconds
> before its expiry time is reached to see if its modified on backend ?
>
>
> sub vcl_fetch {
> set obj.grace = 30s;
> if (!obj.cacheable) {
> pass;
> }
> if (obj.http.Set-Cookie) {
> pass;
> }
> set obj.prefetch = -30s;
> deliver;
> }
>
>
> I see following from varnishlog . What doe that mean ?
>
> 26 VCL_info c XID 3904284923: obj.prefetch (-30) less than ttl
> (-1.26414e+09), ignored.
>
> 0 VCL_call - prefetch
> 0 ExpPick - 3903448954 prefetch
>
>
>
> Thank you.
>
> -Paras
>
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