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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

Public bug reported:

Any enabled placement request filters are processed during scheduling
here:

https://github.com/openstack/nova/blob/d78055df0e39b53fd481c53429ba77f8c1e1ab09/nova/scheduler/manager.py#L127

But then if we're doing a rebuild, we don't call placement:

https://github.com/openstack/nova/blob/d78055df0e39b53fd481c53429ba77f8c1e1ab09/nova/scheduler/manager.py#L132

https://github.com/openstack/nova/blob/d78055df0e39b53fd481c53429ba77f8c1e1ab09/nova/scheduler/manager.py#L135

So we're unnecessarily processing the request spec filters (like
querying the aggregates table) just to throw the results away on
rebuild.

** Affects: nova
     Importance: Medium
         Status: Triaged


** Tags: low-hanging-fruit performance placement rebuild scheduler

** Tags added: low-hanging-fruit

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https://bugs.launchpad.net/bugs/1772523

Title:
  Placement request filters are run on rebuild even though we don't call
  placement

Status in OpenStack Compute (nova):
  Triaged

Bug description:
  Any enabled placement request filters are processed during scheduling
  here:

  https://github.com/openstack/nova/blob/d78055df0e39b53fd481c53429ba77f8c1e1ab09/nova/scheduler/manager.py#L127

  But then if we're doing a rebuild, we don't call placement:

  https://github.com/openstack/nova/blob/d78055df0e39b53fd481c53429ba77f8c1e1ab09/nova/scheduler/manager.py#L132

  https://github.com/openstack/nova/blob/d78055df0e39b53fd481c53429ba77f8c1e1ab09/nova/scheduler/manager.py#L135

  So we're unnecessarily processing the request spec filters (like
  querying the aggregates table) just to throw the results away on
  rebuild.

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