Comment 2 for bug 1387244

This is a known consequence of some last-minute code that was pulled into juno. We have patches up for improving this flow during instance build, as part of this work:

https://review.openstack.org/#/q/status:open+project:openstack/nova+branch:master+topic:bp/flavor-from-sysmeta-to-blob,n,z

This should be specifically related to extra calls during the process of building or resizing instances and not constant additional load. If that's not the case, then please provide extra details.