On Thursday, November 03, 2011 10:29 AM, "Apache Wiki" <wikidi...@apache.org> wrote: > Dear Wiki user, > > You have subscribed to a wiki page or wiki category on "Subversion Wiki" for > change notification. > > The "CopySvnsyncMirrorToMaster" page has been changed by PhilipMartin: > http://wiki.apache.org/subversion/CopySvnsyncMirrorToMaster?action=diff&rev1=7&rev2=8 > > > The master repository has corruption in some of its revision files, but the > mirror repository does not. > ([[http://subversion.tigris.org/issues/show_bug.cgi?id=3845|Issue 3845]]). > > - Master and slave are still live since commits that don't access the corrupt > data still work. > + Master and slave are still live since commits that don't access the corrupt > data still work. We want to copy the slave to the master with minimal > downtime. >
Thanks for making this requirement explicit. > == The Repair == > - Ensure the master repository is off line and the other preconditions are > met. Keep a backup of the master repository before starting to fix it. > + 1. Create a new repository that will become the new master. > + 2. Use 'svnsync init' to setup the slave as the temporary source for the > new master. > + 3. At this point 'svnsync synchronize' can be used to bring the new master > up-to-date, but rsync is probably faster. > + * rsync 'db/current' > + * rsync 'db' excluding 'db/current', db/locks', 'db/transactions', > 'db/txn-protorevs', 'db/revprops' and 'db/rep-cache.db' > + * make slave read-only > + * rsync 'db/rep-cache.db' > + * make slave read-write > + 4. Adjust svn:sync-last-merged-rev to the youngest revision in the new > master and run 'svnsync sync'. You'd need to mkdir revprops/$youngest_shard/ for the sync to work. > + 5. Disable revprop changes on the master, or make the master read-only. > + 6. Copy 'db/revprops' from the master into the new master. > + 7. Make the master read-only if not already. Suggestion: document at the top of the file that this procedure is for Subversion 1.7 and earlier. They may or may not continue to work as we bump FS formats. > + 8. Ensure slave is up-to-date and run 'svnsync sync' to get any final > commits. You deleted the svn:sync-* revprops in step 6. > + 9. Delete svn:sync-* revprops from new master r0. > + 10. Take master offline. > + 11. Replace master 'db' with 'db' from new master. > + 12. Check whether 'db/fsfs.conf' needs to be adjusted. > + 13. Bring master back online. > > - Copy, by any convenient method (such as rsync or by physically shipping a > disk), the following parts of the mirror repository into the master > repository: > - > - * the 'db' subdirectory > - * optionally omit 'db/locks', 'db/transactions', 'db/txn-protorevs' as > they're not needed > - * optionally omit 'db/revprops' if you want to keep the master's revprops > - > - Then delete 'db/locks/*', 'db/transactions/*' and 'db/txn-protorevs/*'. > - > - Check whether the settings in 'db/fsfs.conf' need to be adjusted or merged > with the previous (backed up) version of this file. > - >
