[openstack-dev] [Neutron][db] Promoting healing script to scheme migration script?

Jakub Libosvar libosvar at redhat.com
Mon Jun 9 14:38:18 UTC 2014

Forgot to add tags, sorry

On 06/09/2014 04:18 PM, Jakub Libosvar wrote:
> Hi all,
> I'd like to get some opinions on following idea:
> Because currently we have (thanks to Ann) WIP of healing script capable
> of changing database scheme by comparing tables in the database to
> models in current codebase, I started to think whether it could be used
> generally to db upgrades instead of "generating" migration scripts.
> If I understand correctly the purpose of migration scripts used to be to:
> 1) separate changes according plugins
> 2) upgrade database scheme
> 3) migrate data according the changed scheme
> Since we dropped on conditional migrations, we can cross out no.1).
> The healing script is capable of doing no.2) without any manual effort
> and without adding migration script.
> That means if we will decide to go along with using script for updating
> database scheme, migration scripts will be needed only for data
> migration (no.3)) which are from my experience rare.
> Also other benefit would be that we won't need to store all database
> models from Icehouse release which we probably will need in case we want
> to "heal" database in order to achieve idempotent Icehouse database
> scheme with Juno codebase.
> Please share your ideas and reveal potential glitches in the proposal.
> Thank you,
> Kuba
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