RE: [squid-users] Scheduled fetching of sibling misses

How about if they were sibling and not parent->sibling? Wouldn't it be
logical to assume that ProxyB requested the object because it wanted to
fetch it and it should have gotten it from either DIRECT or other
sibling/parent relationships?

-----Original Message-----
From: Squid Support (Henrik Nordstrom) [mailto:hno@marasystems.com]
Sent: Tuesday, April 02, 2002 6:29 PM
To: francisv@dagupan.com
Cc: squid-users@squid-cache.org
Subject: Re: [squid-users] Scheduled fetching of sibling misses

And this is how I understood your query.

The problem is that ProxyA cannot know that ProxyB has the object.

It only knows that ProxyB some time ago was interested in the object.
Because of this ProxyA needs to be cautious when trying to fetch the
object from ProxyB to not trigger yet another download of the object
by ProxyB.

Regards
Henrik

On Tuesday 02 April 2002 12:09, francisv@dagupan.com wrote:
> I'd like to re-phrase my previous post.
>
> If ProxyB requests an object from ProxyA and returns a MISS, ProxyA
> keeps the information and pre-fetches the same object from ProxyB
> after a period of time knowing that ProxyB must have the object by
> then.
>
> -----Original Message-----
> From: Squid Support (Henrik Nordstrom) [mailto:hno@marasystems.com]
> Sent: Tuesday, April 02, 2002 5:28 PM
> To: francisv@dagupan.com; squid-users@squid-cache.org
> Subject: Re: [squid-users] Scheduled fetching of sibling misses
>
> I have seen a patch doing this a long time ago. No idea where it is
> today.
>
> It is not possible to do it correctly without patching, as the
> request needs to be sent to the sibling with a "Cache-control:
> only-if-cached" header to make sure the sibling do not fetch the
> object again, and you cannot forward such requests via Squid from
> an external program.. (squid acts on the cache-control header).
>
> You may also be interested to look into the push-cache extension to
> Squid. Not exacly this, but in the same area.
>
> Regards
> Henrik
>
> On Tuesday 02 April 2002 10:05, francisv@dagupan.com wrote:
> > Hi,
> >
> > Is there an existing tool that fetches sibling misses at specific
> > periods?
> >
> > For example, ProxyB is a sibling of ProxyA. ProxyB requests an
> > object from ProxyA but it does not have the object thus returning
> > a MISS. ProxyA, knowing that ProxyB requested an object earlier
> > but got a MISS, will try to fetch the object if it's still not in
> > the cache after a specific period of time.
> >
> > Let me know what you think.

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