Regarding reproducibility, that's what I was going for with #3. I found another 
thread, http://svn.haxx.se/users/archive-2009-06/0723.shtml, concluding this 
error is due to fsfsverify not being current with the latest format, so I'll 
give the svndump to new repo and redo revision in new repo a try.

-----Original Message-----
From: Daniel Shahaf [mailto:d...@daniel.shahaf.name] 
Sent: Tuesday, August 03, 2010 9:30 AM
To: Justin Georgeson
Cc: users@subversion.apache.org
Subject: Re: corrupt revision, "Reading one svndiff window read beyond the end 
of the representation"

Justin Georgeson wrote on Mon, Aug 02, 2010 at 17:39:49 -0500:
> I have a repo with >39k revisions. Last week, r39245 was committed, a merge 
> of a single file from trunk to branch. It is the HEAD revision of that file 
> on that branch. Turns out this revision is corrupt
> 
> [svnad...@hourdcm3 ~]$ svnadmin verify -r 39245 /repos/prowess
> svnadmin: Reading one svndiff window read beyond the end of the representation
> 

Is this reproducible?  i.e., if you re-commit r39245 (on top of, say, an
svnsync/backup repository at r39244), does it become corrupted again?

> I've searched from r30000 to HEAD in this repo and that's the only rev that 
> fails the verify. All our backup copies have the same issue too. I'm 
> wondering what our options for recovery are. Some suggestions we have come up 
> with internally are:
> 
> 1. Developer still has sandbox which reports the parent folder as updated, so 
> have him 'svn cat' the previous version and commit that, then re-commit the 
> changes from the corrupt revision
> 2. 'svn rm' the file from the server and re-add it (losing ancestry)
> 3. Some combination of svndump up to that revision, import to new repo, redo 
> that merge in new repo, overwrite the revision file with new one
> 4. delete revision file (seems like bad idea)
> 5. svn dump up to corrupt revision and everything after bad revision, merge 
> dumps, create new repo, redo merge
> 

Don't do #4.

#5 sounds reasonable.  You have to restitch history in some way now.

> Is there something else we missed? Which of these seems like the 
> safest/easiest?
> 
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