[taprobane] Re: Caching: apt-cacher vs apt-proxy

On 1/17/06, Anuradha Ratnaweera <gnu.slash.linux@...> wrote:
>
> After going through apt-cacher and apt-proxy, i came to believe that
> apt-cacher is a better solution

Apt-cacher cleans the cache based on the Packages.gz file.  This is
good.  Here is an example - think of a hypothetical package called x
which has version 6.8.2 in testing and 6.9.0 in unstable.  This is
what happens in apt-proxy if the max number of versions is set to 3 if
the users are using both testing and unstable (and if my understanding
is correct, of course).

- User A users testing and B users unstable
- A downloads testing 6.8.2-1
- B downloads unstable 6.9.0-1
- A upgrades to testing 6.8.2-2 (a new version released)
- Now apt-proxy has 3 versions in the cache
- B upgrades to 6.9.0-2 (a new version release)
- Apt-proxy deletes the oldest version 6.8.2-1 to keep only 3 versions
- B upgrades to 6.9.0-3 (another new version - unstable is moving faster)
- Apt-proxy deletes the oldest version 6.8.2-2

Now there are three versions, 6.9.0-{1,2,3} and no 6.8.2 versions.
The first two are useless and the needed version 6.8.2-2 is deleted.

If cleaning up is donw with Packages.gz file, there will be only two
pakcages left (6.8.2-2 and 6.9.0-3) which is exactly what we want.

Also apt-cacher runs under apache, so it doesn't need to handle HTTP
and scaling complexities - which is one reason for "503 service
unavailable" errors in apt-proxy.

Anyway, more testing and feedback is highly appriciated.

        Anuradha
--
http://anuradha-ratnaweera.blogspot.com
http://www.linux.lk/~anuradha/


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