[svn.haxx.se] · SVN Dev · SVN Users · SVN Org · TSVN Dev · TSVN Users · Subclipse Dev · Subclipse Users · this month's index

Re: Hot backup changes

From: <cmpilato_at_collab.net>
Date: 2002-08-21 06:01:19 CEST

Blair Zajac <blair@orcaware.com> writes:

> 1) Rename hot-backup.py to hot-backup-db.py. No other changes.

Fine by me.

> 2) Create a new hot-backup-repos.py script that creates a single
> file using svnadmin dump --incremental for each revision in the
> repository. The filename will have a format
> svn-dump-v%d-rev%d
> Here the first %d is the SVN-fs-dump-format-version format
> number and the second %d is the revision number.
> The backup program will go through each revision in the
> repository and dump that revision if the file does not
> exist. When there's an upgrade to the dump file format,
> the program will automatically create all the revision
> dumps automatically because the files will not exist.

So, the rule is:

  if (backup file exists)
    svnadmin dump --incremental last-rev > backup_file
    svnadmin dump --incremental 0 last-rev > backup_file


Because, once we hit 1.0, we will most likely have to support old
versions of the dumpfile format forever. If that is what we decide to
do, you don't need multiple dump files, because each time you run
svnadmin dump (even with --incremental) the first line of output is
the format header. svnadmin load would then need only to maintain a
version "state" of sorts:

   SVN-fs-dump-format-version: 1
   Revision-number: 0
   blah blah blah blah

   Revision-number: 1
   blah blah blah blah

   SVN-fs-dump-format-version: 1
   Revision-number: 2
   blah blah blah blah

   SVN-fs-dump-format-version: 1
   Revision-number: 3
   blah blah blah blah

   SVN-fs-dump-format-version: 2 <--- BOOM, right here, starting loading
   Revision-number: 4 from the new format
   blah blah blah blah

   SVN-fs-dump-format-version: 2
   Revision-number: 5
   blah blah blah blah

> Obviously, revision 0 will not use the --incremental option.

Actually, I *think* I coded it so that --incremental doesn't affect
revision 0. Aren't I thoughtful? :-)

To unsubscribe, e-mail: dev-unsubscribe@subversion.tigris.org
For additional commands, e-mail: dev-help@subversion.tigris.org
Received on Wed Aug 21 05:57:44 2002

This is an archived mail posted to the Subversion Dev mailing list.

This site is subject to the Apache Privacy Policy and the Apache Public Forum Archive Policy.