[openstack-dev] [nova] Adding new features to Kilo and future releases - DB upgrades

Kekane, Abhishek Abhishek.Kekane at nttdata.com
Thu Jan 22 08:46:36 UTC 2015

Hi devs,

With online schema changes/No downtime DB upgrades things would be much lot easier for OpenStack deployments.
Big kudos to Johannes who initiated this feature. But as a service provider, I'm curious to understand what is the development process of adding new features to Kilo and future releases once the online schema changes is in.

1.       Will the committer be responsible of adding new procedures of upgrading db with minimal or zero downtime? or the online schema changes framework itself will detect whatever db changes are required on its own and the decision to apply db changes online or offline will be left solely with the service provider?

2.       Is it possible to predict how much time it would take to upgrade db (expand/migrate/contract phases) for adding a new column, constraint.
                For example, adding a new column with NULL constraint would take less time than adding a default value.

Please let us know your valuable opinions for the same.

Thank you,

Abhishek Kekane

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