Re: A modest proposal -- We need a patch penguin

[Andreas Dilger]

On Jan 30, 2002  08:59 -0800, Josh MacDonald wrote:
> Quoting Rik van Riel ([e-mail]):
> > On Wed, 30 Jan 2002, Ingo Molnar wrote:
> > > On Wed, 30 Jan 2002, Larry McVoy wrote:
> > >
> > > > How much of the out order stuff goes away if you could send changes
> > > > out of order as long as they did not overlap (touch the same files)?
> > >
> > > could this be made: 'as long as they do not touch the same lines of
> > > code, taking 3 lines of context into account'? (ie. unified diff
> > > definition of 'collisions' context.)
> > 
> > That would be _wonderful_ and fix the last bitkeeper
> > problem I'm having once in a while.
> 
> This would seem to require a completely new tool for you to specify which 
> hunks within a certain file belong to which changeset.  I can see why
> Larry objects.  What's your solution?

Please see my other email on this subject (out of order BK CSETs).
One relatively easy solution is "proxy CSETs", which describe on a
per-line basis (or xdelta checksum boundaries, even better) the changes
made in "false parent" CSETs, but do not actually contain the changes.
This allows the reciever to resolve the false dependencies, and also
allows the sender to validate (at proxy CSET creation time) that the
out-of-order CSET they are about to send, in fact, does not depend on
any of the "false parent" CSETs.

Cheers, Andreas
--
Andreas Dilger
http://sourceforge.net/projects/ext2resize/
http://www-mddsp.enel.ucalgary.ca/People/adilger/