[Openstack-operators] [nova] Need feedback on spec for handling down cells in the API

Matt Riedemann mriedemos at gmail.com
Thu Jun 7 14:02:15 UTC 2018

We have a nova spec [1] which is at the point that it needs some API 
user (and operator) feedback on what nova API should be doing when 
listing servers and there are down cells (unable to reach the cell DB or 
it times out).

tl;dr: the spec proposes to return "shell" instances which have the 
server uuid and created_at fields set, and maybe some other fields we 
can set, but otherwise a bunch of fields in the server response would be 
set to UNKNOWN sentinel values. This would be unversioned, and therefore 
could wreak havoc on existing client side code that expects fields like 
'config_drive' and 'updated' to be of a certain format.

There are alternatives listed in the spec so please read this over and 
provide feedback since this is a pretty major UX change.

Oh, and no pressure, but today is the spec freeze deadline for Rocky.

[1] https://review.openstack.org/#/c/557369/




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