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RE: Saying goodbye to `svnadmin deltify' ?

From: Bill Tutt <rassilon_at_lyra.org>
Date: 2002-05-30 09:20:40 CEST

> From: cmpilato@collab.net [mailto:cmpilato@collab.net]
> "Bill Tutt" <rassilon@lyra.org> writes:
> > > :-) The problem is that without a delta combiner, people like me
> > > out of stack trying to undeltify some old revisions. The way I
> > > it, we either need an amazing external deltifier, or we should
> > > internally do our deltification in a less prone-to-infinite-growth
> > > fashion. Perhaps this is where the skip-lists come into play.
> > >
> >
> > Possibly, although my take on it (if we don't have a delta combiner)
> > 1.0 would be: Screw it, pretend we're Vesta and just don't deltify
> > anything. As Vesta correctly points out: disk space is cheap, why
> > complicate something needlessly? ;) I'm sure there are are lots of
> > things that need help besides just undeltification performance work.
> > honestly only want to try the skip-list stuff if we figured out that
> > delta-combiner just wasn't possible with svndiff.
> Actually, I was thinking (watch out), and I realized that my brain was
> treating `svnadmin deltify' and `svnadmin undeltify' as a pair, like
> you had to have both, or neither. This is simply bogus. `svnadmin
> undeltify' is mindless to implement (indeed, should still work today,
> though `svnadmin deltify' does not) AND is actually useful. That is,
> right now if I want to be able to dump revision 278 of a copy of the
> Subversion filesystem, I need to undeltify some revisions after 278 so
> my deltas for that revision aren't so darned deep. And you know what?
> I'll never want to re-deltify that, because then I'll be in the same
> ill state I was in when I started!
> LIST-FOLK: If you think we need to keep `svnadmin deltify' around,
> you better let me know soon, 'cause she's about to disappear!
> `svnadmin undeltify' will stay, though (it scratches my itch).

Killing it is fine by me. Die die die!

> > No, auto-merging should commit the predecessor nodes correctly.
> Oh...um...the merge code doesn't (any more) do any cloning whatsoever.
> That code has been ripped out. Hm. Looks like I have some more work
> to do. {grumble, mumble}

Err. The case I mentioned to cause you to go into apoplexy is covered
For Every E not in Ancestor:
      /* E does not exist in target */
      if (! t_entry)
          /* target takes source */
          if (! svn_fs__dag_check_mutable (target, txn_id))
            return svn_error_createf
              (SVN_ERR_FS_NOT_MUTABLE, 0, NULL, trail->pool,
               "unexpected immutable node at \"%s\"", target_path);
          SVN_ERR (svn_fs__dag_set_entry
                   (target, s_entry->name, s_entry->id, txn_id, trail));

Having a mutable NodeRevision in target, should cause the right thing to
happen here.

For the case of the code that I think you were talking about. (logic
case 2 in your new code) There also isn't a problem, because merge gets
invoked recursively, which creates mutable NodeRevisions.


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Received on Sat Jun 1 14:36:16 2002

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