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> Where can I obtain more information about this feature?

- From the blog post that I've yet to write :D

> Does above imply that database is upgraded along with control
> service update as well?

Yes, but only for the services that interact directly with the
database. The services that do *not* need to be upgraded atomically
with the schema are: nova-compute and nova-network.

> One more question - is there an initiative to make icehouse
> database schema work with havana based control services ?

It depends on what you mean by "control services". For icehouse, the
incremental step that we're making is that all the controller services
must be upgraded atomically with the database schema. That means api,
scheduler, conductor, etc. A havana compute node is sufficiently
isolated from the data schema that it will continue to work with an
icehouse conductor, allowing you to upgrade compute nodes
independently after the controller services are updated.

This was just our first step at providing some capability for this. We
hope to continue to increase the capabilities (and decrease the amount
that must be done atomically) going forward.

Hope that helps!

- --Dan
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