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Breaking svnsync mirrors

From: Grierson, David (Lead Engineer) <David.Grierson_at_sky.uk>
Date: Fri, 6 Sep 2019 11:23:29 +0000


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

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?



David Grierson - Lead Engineer
Sky - UK Information Systems - Tools Team
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Received on 2019-09-06 13:23:41 CEST

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