Hi,
[I missed this mail, because Matthieu culled the Cc list again]
On Fri, 18 May 2007, Martin Langhoff wrote:
> On 5/17/07, Matthieu Moy <Matthieu.Moy@xxxxxxx> wrote:
>
> > FYI, bzr uses HTTP range requests, and the introduction of this
> > feature lead to significant performance improvement for them (bzr is
> > more dumb-protocol oriented than git is, so that's really important
> > there). They have this "index file+data file" system too, so you
> > download the full index file, and then send an HTTP range request to
> > get only the relevant parts of the data file.
>
> That's the kind of thing I was imagining. Between the index and an
> additional "index-supplement-for-dumb-protocols" maintained by
> update-server-info, http ranges can be bent to our evil purposes.
>
> Of course it won't be as network-efficient as the git proto, or even
> as the git-over-cgi proto, but it'll surely be server-cpu-and-memory
> efficient. And people will benefit from it without having to do any
> additional setup.
Of course, the problem is that only the server can know beforehand which
objects are needed. Imagine this:
X - Y - Z
\
A
Client has "X", wants "Z", but not "A". Client needs "Y" and "Z". But
client cannot know that it needs "Y" before getting "Z", except if the
server says so.
If you have a solution for that problem, please enlighten me: I don't.
Ciao,
Dscho
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