FW: Repeatable svnsync failure on a particular revision

>I'm using svnsync to back up a repository between two Windows 2003
>machines running "Apache/2.2.4 (Win32) SVN/1.4.3 DAV/2
>mod_auth_sspi/1.0.4 mod_ssl/2.2.4 OpenSSL/0.9.8e".
>
>This failed for me on a revision yesterday, giving the message
>
>svnsync: REPORT request failed on 'http://source-machine/svn/imp'
>svnsync: REPORT of 'http://source-machine/svn/imp': Could not read response body: An existing connection was forcibly closed by the remote host. (http://source-machine)
>
>The interesting aspect is that this failure was repeatable, and always
>occurred at the same point. When I looked at the transactions folder on
>the destination machine, I could see the size of the 'rev' file
>increasing as svnsync ran, but it always failed when rev got to 47971744
>bytes. (For context, the size of the incremental dump file for that
>revision is 56085661 bytes).
>
>In the Apache server log on the source machine, I see in each case a lot
>of PROPFINDs from the destination machine, finishing with:
>
>10.1.8.1 - project-svnowner [06/Feb/2008:15:21:07 +0000] "REPORT http://source-machine/svn/imp HTTP/1.1" 200 68622428
>
>with a timestamp approximately seven minutes before the last update to
>the 'rev' file. I guess this is the failing request.
>
>I don't think it's the size of the revision that is the problem - I've
>successfully used svnsync to transfer bigger ones anyway.
>
>This is a critical server and backup for me, so I've had to manually
>work around the problem now (svnadmin dump / load of the problem
>revision, followed by manual adjustment of the revision 0 revprops).
>However, if anyone has experienced anything similar, or has a theory
>about what the problem was, I'd like to hear it. I can also help
>investigate if needed.

I'm forwarding this to the dev list because

a) no-one replied on the users list - I don't think svnsync is
   used that widely,
b) it looks like it might be a developer-related issue,
c) it's happened to me again on a couple of subsequent revisions,

The transactions always fail when the rev file is getting near
to the 50M mark - not exactly the same for each failed revision,
but always the same for each attempted transaction when
trying to sync that revision.

I suspect the problem is with Apache rather than Subversion. Is
there any easy way I can narrow the fault to one or the other?

Regards,

--
Jon Ashley
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