Re: fast-import deltas

From: Mike Hommey <mh@glandium.org>
Date: Apr 2, 2014, 04:13 UTC
Message-ID: <20140402041346.GB15690@glandium.org>
In-Reply-To: <A0BF7D05-E351-4A5B-8F0F-DD0FAD391656@quendi.de>

On Wed, Apr 02, 2014 at 01:29:13AM +0200, Max Horn wrote:

Show 20 quoted lines

> 
> On 01.04.2014, at 15:15, Jeff King <peff@peff.net> wrote:
> 
> > On Tue, Apr 01, 2014 at 10:07:03PM +0900, Mike Hommey wrote:
> > 
> >>> For my own curiosity, how does this differ from what is in
> >>> contrib/remote-helpers/git-remote-hg?
> >> 
> >> contrib/remote-helpers/git-remote-hg does a local mercurial clone
> >> before doing the git conversion. While this is not really a problem
> >> for most mercurial projects, it tends to be slow with big ones,
> >> like the firefox source code. What I'm aiming at is something that
> >> can talk directly to a remote mercurial server.
> > 
> > Ah, that makes sense. Thanks for explaining.
> 
> 
> Hm, myself, I am not quite convinced. Yes, there is an overhead, but
> it is one-time (well, the space overhead is not, but Mike only
> mentioned time, not space).

I didn't mention it, but it definitely is a factor. As for the performance factor, it certainly is more than a one-time overhead.

> I wonder if it is really worth the effort
> to start yet another project on this... Moreover, I don't see a
> fundamental reason why one could not modify git-remote-hg to work this
> way.

The way git-remote-hg works is fundamentally different to how one can directly get and push stuff to a remote mercurial server. As such, there is not much value in the current git-remote-hg code for that purpose. Also, I'm currently prototyping something to see whether what I think should work really works. Starting from the current git-remote-hg code would add useless constraints to the prototype.

Mike