Comment 3 for bug 921294

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Thierry Carrez (ttx) wrote : Re: Migration 074 assumes connection_type is defined locally during migrations

Hmm. I think Adam's point is that connection_type is nova-compute-specific, and on a multi-node setup you may be running the DB migration from a host that is not nova-compute and therefore has no connection_type set...

That sounds pretty brittle to me, especially in packaging as they "run nova-manage db sync" during package install/upgrades.