Comment 2 for bug 1445000

For the db_sync issue, if my undstanding is correct, this serie of patches[1] aims to fix that

So if you have multiple controller nodes that does db_sync and you have a Galera (or any master/master replication setup) you basically enable the db_sync on a single node only and set it to false for the other node.

[1] https://review.openstack.org/#/q/status:open+branch:master+topic:db_sync,n,z

If I am totally out topic please let me know.