[openstack-dev] [nova] need input on possible API change for bug #1420848

Chris Friesen chris.friesen at windriver.com
Wed Mar 11 15:32:11 UTC 2015


I'm working on bug #1420848 which addresses the issue that doing a 
"service-disable" followed by a "service-enable" against a "down" compute node 
will result in the compute node going "up" for a while, possibly causing delays 
to operations that try to schedule on that compute node.

The proposed solution is to add a new "reported_at" field in the DB schema to 
track when the service calls _report_state().

The backend is straightforward, but I'm trying to figure out the best way to 
represent this via the REST API response.

Currently we response includes an "updated_at" property, which maps directly to 
the auto-updated "updated_at" field in the database.

Would it be acceptable to just put the "reported_at" value (if it exists) in the 
"updated_at" property?  Logically the "reported_at" value is just a 
determination of when the service updated its own state, so an argument could be 
made that this shouldn't break anything.

Otherwise, by my reading of 
"https://wiki.openstack.org/wiki/APIChangeGuidelines#Generally_Considered_OK" it 
seems like if I wanted to add a new "reported_at" property I would need to do it 
via an API extension.

Anyone have opinions?


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