bzr-svn branches

[Jelmer Vernooij]

John Arbash Meinel wrote:
> Russel Winder wrote:
>> Jelmer,
> 
>> On Wed, 2009-04-08 at 13:01 +0200, Jelmer Vernooij wrote:
> 
>>>> Are you tracking bzr.dev so all changes to bzr.dev are in this branch?
>>> Yep. It should usually be up to date
>> OK, I may well give it a try as a drop in replacement.  Fingers
>> crossed :-)
> 
>>>> What are the fixes that make Subversion access so much faster?  If there
>>>> are so efficacious, why aren't then in bzr.dev?
>>> They are pending to be included in bzr.dev, but they still need to be
>>> reviewed, possibly fixed and then merged. This branch contains a
>>> "preview" of those changes.
>> Splendid.
> 
>> Is there a short explanation of how you got the Subversion interaction
>> down by such a huge factor?
> 
> 
> I believe the bulk of 80s => 3s is because of "tag.fetch()".
> 
> Basically, SVN doesn't have an index of what tags would exist for a
> given branch, so bzr-svn has to search the whole ancestry of the branch
> to see if any revision was turned into a tag.

Yep, exactly.

> Jelmer's update is that he changes tag.fetch() to only fetch tags for
> revisions which were actually fetched. It means that tagging an old
> revision of a branch wouldn't get fetched, but I don't know how much
> that actually happens for SVN branches, or if Jelmer provides a way to
> say "no, really, get all the tags".
Actually, those tags would be fetched, since bzr-svn looks at all tag
changes since the previous last revision of the local branch. So if the
last svn revision fetched in the local branch is "3" and svn revno "4"
created a tag "bar" in Subversion for revision 1 then that tag would be
fetched without problems.

Cheers,

Jelmer