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Posted to users@subversion.apache.org by Bryon Winger <br...@gmail.com> on 2013/04/02 23:32:05 UTC
Re: Splitting out project from repo
I am going through a similar process myself and have some questions about
your concerns. I'm not trying to rock the boat, just looking fo clarity on
a few
points.
For perspective, I am working with around 300 individual projects
in a 70+ Gb repository containing over 300k revisions.
> If I understand correctly, you manually retrieve each version where
> the given path/project has changed in any way to afterwards dump those
> revisions. Why is this better/faster than using svndumpfilter with
> specifying an include path, but without the need to post process the
> dump files?
I personally don't see the advantage to waiting around for svnadmin dump
to process every unrelated revision. For one project, I am only concerned
with about 200 revisions, spread out over 210k unrelated revisions.
# This example took around 8 hours:
svnadmin dump /path/to/master | svndumpfilter --drop-empty-revs \
--re-number-revs include $PROJECT > $PROJECT.dump
# However, when I run this on the same project:
for rev in `svn log -r0:HEAD file:///path/to/master/$PROJECT | egrep \
"^r[0-9]+ |" | cut -d " " -f1`; do
svnadmin dump --incremental -r ${rev:1} /path/to/master | svndumpfilter \
include $PROJECT >>
$PROJECT.dump
done
… I can have a usable dump file in under 30 seconds. I realize this will
take
longer for larger projects, but I think it makes my point. ‘svnadmin dump’
is
still creating a full dump stream for each revision before svndumpfilter
sees
that revision to decide to keep it or not.
> Are you sure your approach doesn't need other paths
> from the repo, e.g. other source paths from copy operations for
> projects or stuff like that?
>
I absolutely agree with this checking for this. You can’t successfully pull
out
a single path using svnadmin dump / svndumpfilter if there are copies from
a
location outside of whatever you are filtering for.
I did notice that using svnrdump pointing to url/project seems to get
around the outside-copy-sources issue, but I think that’s another
discussion altogether.
> > svnadmin dump $repo --quiet -r $rev --incremental >> $project.$rev.bak
>
> Adding to revision files with >> should be impossible in your
> approach.
Are you saying that appending to an existing dump file in general is a
problem or just with all of his node-path processing? I have had no
trouble appending to existing dump files.
Thanks,
Bryon Winger
Re: Splitting out project from repo
Posted by Bryon Winger <br...@gmail.com>.
>
> for rev in `svn log -r0:HEAD ${url}/${project} | \
>
> egrep "^r[0-9]+ |" | cut -d " " -f1`; do
>
> svnrdump dump --incremental -r ${rev:1} ${url}/${project} >>
> ${project}.dump
>
> done
>
Basically, I am only dumping (incrementally) the revisions which actually
>
> affect the path in question.
>
I have since discoved that incrementally dumping specific revisions via
svnrdump is not
as safe as I previously thought. Some paths that were copied from outside
sources did not
get included because I skipped the revision in which it was copied from.
So to correct myself and save others frustration - don't skip revisions
with svnrdump (as
in my example above) unless you absolutely know that you won't be missing
anything.
Bryon
Re: Splitting out project from repo
Posted by Bryon Winger <br...@gmail.com>.
> You probably still want the svndumpfilter processing to drop empty
> revisions before loading it in a new repository.
>
I believe that the current version of svndumpfilter only operates on
version 2 dump streams - which svnadmin dump produces. svnrdump
produces a version 3 dump stream and is not compatible with svnrdump.
That being said, I am able to get around dumping empty revisions (from a
previous dump/load) with svnrdump by running something along these lines:
for rev in `svn log -r0:HEAD ${url}/${project} | \
egrep "^r[0-9]+ |" | cut -d " " -f1`; do
svnrdump dump --incremental -r ${rev:1} ${url}/${project} >>
${project}.dump
done
Basically, I am only dumping (incrementally) the revisions which actually
affect the path in question. This obviously is not as fast as doing
everything
server-side, but it does appear to work around having files or directories
copied from paths outside of the particular project path. The
outside-copy-paths are dumped in full as opposed to just a simple reference
as to where it was originally copied from.
I would appreciate some feedback if I’m missing something or if the above
statement is inaccurate or unreliable. In my tests, everything appears to
be
the same once loaded into a fresh repository, checked out in full and
diffed
against the originals.
There is a very brief mention in the svn-book of appending to an existing
dump file, so I expect that to be safe in general. It can be found in the
“*Repository Backup*<http://svnbook.red-bean.com/en/1.7/svn.reposadmin.maint.html#svn.reposadmin.maint.backup>”
section by searching for ‘appending’.
Thanks,
Bryon Winger
RE: Splitting out project from repo
Posted by Bert Huijben <be...@qqmail.nl>.
Hi,
The ‘svnrdump’ tool that was added in Subversion 1.7 might do exactly what you to do.
This tool allows creating a dumpfile from a url (E.g. file:///path/to/repos <file:///\\path\to\repos> ) and should skip unrelated paths for you during the repository processing.
You probably still want the svndumpfilter processing to drop empty revisions before loading it in a new repository.
Bert
From: Bryon Winger [mailto:bryonwinger@gmail.com]
Sent: dinsdag 2 april 2013 23:32
To: subversion_users@googlegroups.com
Cc: users@subversion.apache.org; tschoening@am-soft.de
Subject: Re: Splitting out project from repo
I am going through a similar process myself and have some questions about
your concerns. I'm not trying to rock the boat, just looking fo clarity on a few
points.
For perspective, I am working with around 300 individual projects
in a 70+ Gb repository containing over 300k revisions.
If I understand correctly, you manually retrieve each version where
the given path/project has changed in any way to afterwards dump those
revisions. Why is this better/faster than using svndumpfilter with
specifying an include path, but without the need to post process the
dump files?
I personally don't see the advantage to waiting around for svnadmin dump
to process every unrelated revision. For one project, I am only concerned
with about 200 revisions, spread out over 210k unrelated revisions.
# This example took around 8 hours:
svnadmin dump /path/to/master | svndumpfilter --drop-empty-revs \
--re-number-revs include $PROJECT > $PROJECT.dump
# However, when I run this on the same project:
for rev in `svn log -r0:HEAD file:///path/to/master/$PROJECT <file:///\\path\to\master\$PROJECT> | egrep \
"^r[0-9]+ |" | cut -d " " -f1`; do
svnadmin dump --incremental -r ${rev:1} /path/to/master | svndumpfilter \
include $PROJECT >> $PROJECT.dump
done
… I can have a usable dump file in under 30 seconds. I realize this will take
longer for larger projects, but I think it makes my point. ‘svnadmin dump’ is
still creating a full dump stream for each revision before svndumpfilter sees
that revision to decide to keep it or not.
Are you sure your approach doesn't need other paths
from the repo, e.g. other source paths from copy operations for
projects or stuff like that?
I absolutely agree with this checking for this. You can’t successfully pull out
a single path using svnadmin dump / svndumpfilter if there are copies from a
location outside of whatever you are filtering for.
I did notice that using svnrdump pointing to url/project seems to get
around the outside-copy-sources issue, but I think that’s another
discussion altogether.
> svnadmin dump $repo --quiet -r $rev --incremental >> $project.$rev.bak
Adding to revision files with >> should be impossible in your
approach.
Are you saying that appending to an existing dump file in general is a
problem or just with all of his node-path processing? I have had no
trouble appending to existing dump files.
Thanks,
Bryon Winger
Re: Splitting out project from repo
Posted by Thorsten Schöning <ts...@am-soft.de>.
Guten Tag Bryon Winger,
am Dienstag, 2. April 2013 um 23:32 schrieben Sie:
> Are you saying that appending to an existing dump file in general is a
>
> problem or just with all of his node-path processing? I have had no
>
> trouble appending to existing dump files.
I don't know if appending to a dump file is supported or not, I just
meant his revision based file naming approach.
Mit freundlichen Grüßen,
Thorsten Schöning
--
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