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Re: svn 1.8 migration - directory deltification and revprop packing

From: C. Michael Pilato <cmpilato_at_collab.net>
Date: Tue, 11 Jun 2013 17:32:59 +0200

On 06/11/2013 05:14 PM, Daniel Shahaf wrote:
> C. Michael Pilato wrote on Tue, Jun 11, 2013 at 14:52:48 +0200:
>> As for the --deltas option, that has nothing in the world to do with the
>> types of deltas we're discussing here. (As an aside, I would highly
>> recommend that, unless you need your dumpfiles to be smaller, avoid the
>> --deltas option. The performance penalty of using it isn't worth it.)
>
> That's because we store skip-deltas but dumpfiles want deltas against
> predecessor, right?
>
> So, two thoughts:
>
> - Is this still a problem with the new max-linear-deltification setting?
>
> - Can we teach 'svnadmin dump' to just dump whatever delta is stored in
> the filesystem, plus the base of that delta? For the common case of
> loading the entire dump file, it's not really important what the delta
> base is so long as it's older than the dumped revision.

To do so, we'd need to expose the deltas via the libsvn_fs API, which is
currently not the case. Deltas in the repository filesystem are an
implementation detail of that filesystem. They are not even guaranteed to
be implemented in a fashion that is compatible with what is used in the
repository dump stream format.

-- 
C. Michael Pilato <cmpilato_at_collab.net>
CollabNet   <>   www.collab.net   <>   Enterprise Cloud Development

Received on 2013-06-11 17:33:42 CEST

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