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Re: filesystem crash, FSFS corrupted (svn 1.3.2)

From: Larry Martell <larry.martell_at_gmail.com>
Date: 2007-04-10 22:18:44 CEST

On 4/10/07, Andreas Hasenack <andreas@conectiva.com.br> wrote:
> We had a filesystem crash and after running fsck, the svn backend (FSFS)
> was corrupted. Some checkouts work, most don't.
>
> svnadmin recover says everything is fine, but svnadmin verify quickly
> finds errors in very old revisions.
>
> svnadmin dump also doesn't work, stopping on the first error it
> encounters.
>
> So far, we are running this script which seems to skip over the bad
> entries:
>
> svnadmin dump --incremental -r $r /svn | svnadmin load $(pwd)/repos/
>
> $r is looped over all revisions
>
> Right now, I'm not that much worried about the lost data. What worries
> me is that lost data is preventing me from getting to the good data. I
> thought svnadmin recover would do that: nuke the corrupted parts and
> leave me with the good ones, but that is not the case.
>
> The above procedure (dump & reload) is still running, should take a few
> hours.
>
> The error messages are various. Here are some:
> # svnadmin verify /svn
> (...)
> * Verified revision 14.
> svnadmin: Can't read file '/svn/db/revs/99182': End of file
> found
>
> - malformed header
>
> It also seems fsck moved some files from revprops to revs. For example,
> that 99182 one from the error above:
> # cat /svn/db/revs/99182
> K 10
> svn:author
> V 8
> proxyusr
> K 8
> svn:date
> V 27
> 2007-02-21T10:05:27.113645Z
> K 7
> svn:log
> V 12
> Tagging 0.03
> END
>
> This looks like it should belong to revprops, but I'm not that familiar
> with FSFS internals. Anyway, seems everything was badly corrupted.
>
> So, basically, is there some magic command that would fix the
> consistency of the repository, leaving me with just the data that can be
> salvaged? Is the dump&reload procedure I'm doing above the best thing
> (besides after having a sane backup, of course)?

Sorry, I have no advice or magic bullet for you, but I did want to point out
that "svnadmin recover" is only for BDB repositories - it has no effect at
all on FSFS repos.

Good luck with your recovery!
-larry

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Received on Tue Apr 10 22:19:11 2007

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