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RE: sync bug -> corrupted proxy repo

From: Jon Foster <Jon.Foster_at_cabot.co.uk>
Date: Wed, 13 Jan 2010 13:12:53 -0000


Andersen, Krista [mailto:Krista.Andersen_at_itg.com] wrote:
> Twice I have seen one of my proxy repositories become corrupted due
> to an apparent bug in the svnsync sync process. Has anyone else
> seen this type of behavior from Subversion?

This is probably caused by issue 3546 [1][2]. This is a race
condition - if you have several sync processes running at the same
time then the mirror can get corrupted. You had three commits which
were 1 second apart, so your hook script started 3 copies of svnsync
within 2 seconds. I think this is the first practical report of this
bug; previous discussion was theoretical.

> Here is a comparison the output of the svn log -v for the offending
> revisions (324,325) on both the corrupted and non-corrupted proxy
> repo.

It looks like rev 323 got mirrored twice (as mirror revs 323 and 324),
then rev 324 was mirrored (as mirror rev 325).

> I am a bit concerned about the stability of Subversion since this
> is the second time in two months that I have had to fix this issue.
> Is there a patch or something to prevent this in the future?

Suggested workaround: Change your hook scripts to use the lockf or
lockfile tools[3] to ensure that only one instance of svnsync runs
at once.

Kind regards,


[2] http://subversion.tigris.org/issues/show_bug.cgi?id=3546


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