There are lots of ways to do version control in VOS-- we already have it
partly implemented. One important thing that we need to decide is how
to expose particular object revisions to remote sites. I think we need
to be able to refer (by URL) to both the current version, or to any past
version (in all ways as a normal vobject, with all interfaces, etc.)
This means that if that version object is mutable, i.e. a not read-only
property, we need to also have branches in the version history, and any
reference to a past version of a vobjcet is really a reference to "the
most recent version in the branch rooted on this object, which if there
is only one version in the branch, is the same as the root object" [if
that makes any sense].
Reed
On Tue, May 08, 2007 at 06:51:20PM +0000, Lalo Martins wrote:
> (Cutting the great summary, keeping the VOS part)
>
> On Mon, 07 May 2007 22:57:05 -0400, Peter Amstutz wrote:
> > So, Lalo, this is probably a bit more than you expected :-) I think the
> > answer to your question ("could VOS be useful for the things Van
> > Jacobson talks about") is yes, if we incorporate a robust notion of time
> > and version as related to state changes. If anyone thinks this is
> > fanciful, this actually cuts right to the core of how remote vobjects
> > work, and how we eventually handle caching -- central issues to the s5
> > redesign.
>
> The gratifying thing is that we already talked about this sort of thing
> before, and I think the ideas we reached then are still perfectly valid
> in this context.
>
> I was thinking earlier this week about version-control-like updates; in
> cases where you know sending a whole tree of vobjects is expensive, and
> that it typically doesn't update much (or rather, most updates affect
> only the same small subset of objects). Then we go in an approach
> similar to bzr (or svn); we send our last-seen revision, the server
> computes a "patch" and sends it back. (That's just the tip of the
> iceberg; this raises questions of storage space, which are answered with
> horizons, which raises other questions and so on...)
>
> best,
> Lalo Martins
> --
> So many of our dreams at first seem impossible,
> then they seem improbable, and then, when we
> summon the will, they soon become inevitable.
> -----
> personal: http://lalo.hystericalraisins.net/
> technical: http://www.hystericalraisins.net/
> GNU: never give up freedom http://www.gnu.org/
>
>
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