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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

I think at this point we can mark the nova portion of this as won't fix
with these changes to manage allocation ratios:

https://docs.openstack.org/nova/latest/admin/configuration/schedulers.html
#allocation-ratios

The workaround outside of that is to rely on that osc-placement patch
linked into comment 19.

** Changed in: nova
       Status: Triaged => Won't Fix

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https://bugs.launchpad.net/bugs/1804125

Title:
  Nova placement disregards nova aggregate metadata

Status in OpenStack Compute (nova):
  Won't Fix
Status in placement-osc-plugin:
  Opinion

Bug description:
  OpenStack 17.0.8 deployed via OpenStack-Ansible.

  We have a compute environment set up with several nova aggregates,
  across which we wish to configure different cpu allocation ratios.
  Setting cpu_allocation_ratio as metadata on an aggregate and invoking
  the AggregateCoreFilter scheduler filter is ineffective and hosts fail
  to schedule past the default allocation ratio for a given compute
  node; debug scheduler logs suggest that the ignored compute nodes
  never even make it into the scheduler filter list, and indeed aren't
  even listed in the host state updates that scheduler logs.

  It appears from this single comment I was able to find in another bug
  report that placement intentionally disregards aggregate metadata, and
  so excludes compute nodes that might well be capable of scheduling
  instances:

  https://bugs.launchpad.net/nova/+bug/1742827/comments/13

  Manually updating nova.conf on the affected compute nodes to set the
  intended cpu_allocation_ratio works, but means we need to set up an
  exception in our OSA config, and that hosts will not automatically
  obtain new resource allocation ratios when moved between aggregates.

  Is this intended placement behavior? If so, what's the function of
  AggregateCoreFilter, and is there a way to restore its pre-placement
  functionality?

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