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Re: Breaking svnsync mirrors

From: Branko Čibej <brane_at_apache.org>
Date: Fri, 6 Sep 2019 13:52:56 +0200

On 06.09.2019 13:23, Grierson, David (Lead Engineer) wrote:
> Hi,
> We're in the process of migrating & upgrading our Subversion installation. In doing so we're encountering a handful of repos which were impacted by issue 4129 (https://subversion.apache.org/docs/issue4129).
> The fix for this (to dump & reload) has been successful with most of the repos, however to do this you need to have sufficient storage to duplicate the repos; and one of the repos in question is over 700GB in size!
> As an alternative, I'm looking to use svnsync to fix this repository; I'm just looking to clarify the process for completing this.
> On new host:
> 1) svnadmin create /path/to/new-repo
> 2) Create /path/to/new-repo/pre-revprop-change hook
> 3) svnsync init file:///path/to/new-repo https://url/to/old-repo
> 4) svnsync sync file:///path/to/new-repo
> Allow the data to copy across ... then ...
> 5) svnsync copy-revprops --skip-unchanged file:///path/to/new-repo
> At this point there will be a copy of the existing repository. Periodically we'll then be able to run the 'svnsync sync' and 'svnsync copy-revprops' to copy across any new revisions.
> We'll then schedule the cutover weekend so would perform something like:
> 1) Disable access to repos on old host.
> 2) Perform final 'svnsync sync ...' & 'svnsync copy-revprops ...' on new host.
> 3) Shutdown Subversion on old host.
> 4) Remove the following revision properties from revision 0 on /path/to/new-repo
> svn:sync-from-url
> svn:sync-from-uuid
> svn:sync-last-merged-rev
> svn:sync-lock
> I just want to confirm that my process seems sensible and that what I've described regarding breaking the svnsync mirror is correct.
> If anyone can see anything that I might have wrong or missed?

Looks both sensible and correct to me, except that you seem to be
missing one step:

    5) Copy httpd and/or svnserve configuration and hooks from the old host.

You don't want to keep hooks for the synced repository in the production

-- Brane
Received on 2019-09-06 13:53:00 CEST

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