[openstack-dev] [Nova] RFC Host Maintenance

Balázs Gibizer balazs.gibizer at ericsson.com
Fri Apr 8 09:52:31 UTC 2016

> -----Original Message-----
> From: Qiming Teng [mailto:tengqim at linux.vnet.ibm.com]
> Sent: April 07, 2016 15:42
> The only gap based on my limited understanding is that nova is not emitting
> events compute host state changes. This knowledge is still kept inside nova
> as some service states. If that info is posted to oslo messaging, a lot of usage
> scenarios can be enabled and we can avoid too much churns to nova itself.

Nova does not really know the state of the compute host, it knows only the state of the nova-compute service running on the compute host. In Mitaka we added notification about the service status[2]. 
Also there is a proposal about notification about hypervisor info change [1].


[1] https://review.openstack.org/#/c/299807/
[2] http://docs.openstack.org/developer/nova/notifications.html#existing-versioned-notifications 

> Regards,
>   Qiming
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