Re: [squid-users] StoreID and concurrency?

On 8/06/2013 1:43 a.m., csn233 wrote:
> On Thu, Jun 6, 2013 at 11:24 PM, Eliezer Croitoru <eliezer_at_ngtech.co.il> wrote:
>> This is the best example to demonstrate how CDN urls are being and can be
>> used.
>> Right the next couple urls will result in the same storeID
>> http://freefr.dl.sourceforge.net/project/vlc/2.0.5/win32/vlc-2.0.5-win32.exe
>> http://freefr3.dl.sourceforge.net/project/vlc/2.0.5/win32/vlc-2.0.5-win32.exe
>> http://freefr2.dl.sourceforge.net/project/vlc/2.0.5/win32/vlc-2.0.5-win32.exe
>> http://freefr1.dl.sourceforge.net/project/vlc/2.0.5/win32/vlc-2.0.5-win32.exe
>> OK
>> store-id=http://dl.sourceforge.net.squid.internal/project/vlc/2.0.5/win32/vlc-2.0.5-win32.exe
>> There is not such thing as un-cachable from the proxy point of view but
>> rather what the proxy prefers to not cache.
>> Youtube example is a really good and complex one.
>> it was explained long before I wrote my helper and code.
>> The reason you might not understand it is that you need to learn a bit more
>> to make sure you understand what StoreID and what StoreUrlRewrite does.
>> I am here for that..
> That is indeed a great example. 4 different URLs pointing to the same
> StoreID, meaning the same cached copy can be served.
>
> However, in the example I was pointing to, it shows a 1 to 1 rewrite.
> It does not convey the same message that this 4-to-1 rewrite would,
> for someone new to the concept. Do you understand that point?
>
> Technically, StoreID may be implemented differently from StoreURL, but
> from a conceptual user point of view they achieve exactly the same
> thing. From a user point of view, they don't need to know the
> difference, apart from the additional concurrency parameter and one
> really crucial point (to me anyway) that the refresh_pattern is
> applied after the rewrite for one, and before for the other. That got
> me scratching my head a bit... :)

Aha. Would you mind reading through the draft 3.4 release notes on this
feature and checking that those points are highlighted enough or in the
right way?
http://master.squid-cache.org/Versions/v3/3.HEAD/RELEASENOTES.html#ss2.3

Amos
Received on Fri Jun 07 2013 - 14:46:18 MDT