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From Nico Kadel-Garcia <>
Subject Re: Upgrade Subversion from 1.5 to 1.9
Date Wed, 23 Mar 2016 02:59:13 GMT
On Tue, Mar 22, 2016 at 6:47 AM, Stefan Sperling <> wrote:
> On Tue, Mar 22, 2016 at 12:25:42AM -0400, Nico Kadel-Garcia wrote:
>> Then, when ready to switchover, make a good backup of the old system,
>> *LOCK IT* to prevent any further ocmmits, and switch services to the
>> new server. You should be able to activate a proxy or port forwarding
>> for the old service, if needed, so anyone who accidentally tries to
>> reach the old one actually gets the new one.
> If all deployed clients are >= 1.7, HTTP redirects from old server to the
> new server will take of moving clients over to the new server automatically:

My big concern would be anyone continuing to write to the old server,
irrelevant of redirects. Local file based Subversion access, svn_ssh
access that hasn't been disabled, and dangling svnserve based services
also need to be either never made available, or forcibly blocked, to
prevent fascinating split-brain problems.

Redirects.... well, that relies on enough control of web servers based
access, possibly including DNS, to ensure a reliable redirect.

> This only matters if the URL has changed, of course. If you can switch the
> server while keeping the URL intact, that's even better.

Yeah, *locking* the old service becomes pretty critical. If one can
ensure that *no* write occur to the new server that didn't occur on
the old server first, before the switchover happens, it's invaluable
to help prevent split-brain problems.

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