Is LCI on the radar?

[Laurence Rowe]

On 31 May 2011 10:34, Per Buer <perbu at varnish-software.com> wrote:

> Hi
>
> On Tue, May 31, 2011 at 12:23 AM, Lukas Kahwe Smith <mls at pooteeweet.org>wrote:
>
>> Hi,
>>
>> I assume some of you have stumbled over LCI by now:
>> http://www.ietf.org/id/draft-nottingham-linked-cache-inv-00.txt
>>
>> This is actually quite interesting. For an application we are building we
>> are looking to create an invalidation service to which the various
>> independent frontend server applications can register and which gets
>> notified by the backend. Of course the frontends then have to figure out
>> which pages all need to be invalidated. The original article will be easy.
>> Some of the category overviews will also be easy to delete. What will
>> already get harder is invalidating all articles that reference the given
>> article and worse yet would be if we start caching search results.
>>
>> So I am wondering if you guys are looking at LCI for a future varnish
>> impovement and if someone has build something like this on top of varnish
>> today already that could maybe help us here.
>>
>
> I'm pretty sure this can be implemented in VCL. No need to place it on the
> radar. I have an upcoming blog-post describing something similar. It might
> get a bit hairy with all the regular expression so it might be cleaner in a
> module.
>

I experimented with something that sounds similar. Each page set a header
recording the the content item ids that were used in rendering the page.
They could then be purged with a regex including any dependents id.
http://dev.plone.org/collective/browser/experimental.depends/trunk/varnish.vcl

It works when you update or delete a content item, but it can't help the
case where you add a new content item and want that to appear in listing.

Laurence
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