Mailinglist Archive: zypp-devel (78 mails)

[Michael Matz <matz@xxxxxxx>]

Hi,

On Fri, 2 Nov 2007, Benji Weber wrote:

> I would like to propose:
>
> - Diffed metadata

Hey, great minds think alike as they say :)  Yes, we are actively trying 
to do just that with the SOLV files which Stano already mentioned in the 
plan.  The general plan is to rely on an xdelta/rsync like algorithm, 
where we have two possibilities:

1) the requester generates a list of blocks it has, sends them to the 
   server, that one figures out which blocks are missing, and sends a diff 
   description to the client, which reconstructs the file.

2) The server generates once (when the file changed) a list of block it 
   has, client downloads that one, and actively asks for the blocks it 
   still needs.

3) server pre-generates a set of xdelta diffs from every file revision to 
   the current one, clients asks for the xdelta matching his own revision, 
   and updates according to that.

The second solution theoretically is the most attractive one: it doesn't 
put high demands (CPU and space-wise) on the server, which still allowing 
much smaller downloads.

The first solution would allow a bit better compression, but it remains to 
be seen if it's worth it.

The third solution is the ugliest one (engineering wise) :)


Ciao,
Michael.
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