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[Ihar Hrachyshka <2027156@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Originally reported at
https://bugzilla.redhat.com/show_bug.cgi?id=2222102

--

When nova creates a VM, it issues a request to fetch all ports for the
project, which may take a significant time and even time out.

The code in
https://github.com/openstack/nova/blob/master/nova/network/neutron.py#L2654
suggests that nova fetches IDs of all project ports just to count the
number of ports in db and compare it to quota (to pre-validate that
there's enough free ports to allocate for the request).

Instead of fetching all IDs via get_ports, nova should attempt to use
quota_details API that gives ready access to info on available ports:

https://docs.openstack.org/api-ref/network/v2/?expanded=list-quotas-for-
projects-with-non-default-quota-values-detail,show-quota-details-for-a-
tenant-detail#quotas-details-extension-quota-details

Note that this is an API extension and was added later than the original
`quota` API, so it may be that special care should be taken to
accommodate to neutron-servers with no such extension.

Also, the extension seems to be controlled by the cfg.CONF.QUOTAS.quota_driver 
 config option: https://github.com/openstack/neutron/blob/6fa9142ced0eed8de9a89042747438b93de7202d/neutron/extensions/quotasv2_detail.py#L37

Which means that there may be an (upstream) configuration that would end
up with quota_details API missing. So a fallback mechanism may be due.

Side note: it may be argued that neutron should not expose this config
option in the first place. This bz doesn't attempt to address this
request.

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: neutron

** Tags added: neutron

-- 
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Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/2027156

Title:
  nova should use quota_details neutron api to validate available ports
  before VM creation

Status in OpenStack Compute (nova):
  New

Bug description:
  Originally reported at
  https://bugzilla.redhat.com/show_bug.cgi?id=2222102

  --

  When nova creates a VM, it issues a request to fetch all ports for the
  project, which may take a significant time and even time out.

  The code in
  https://github.com/openstack/nova/blob/master/nova/network/neutron.py#L2654
  suggests that nova fetches IDs of all project ports just to count the
  number of ports in db and compare it to quota (to pre-validate that
  there's enough free ports to allocate for the request).

  Instead of fetching all IDs via get_ports, nova should attempt to use
  quota_details API that gives ready access to info on available ports:

  https://docs.openstack.org/api-ref/network/v2/?expanded=list-quotas-
  for-projects-with-non-default-quota-values-detail,show-quota-details-
  for-a-tenant-detail#quotas-details-extension-quota-details

  Note that this is an API extension and was added later than the
  original `quota` API, so it may be that special care should be taken
  to accommodate to neutron-servers with no such extension.

  Also, the extension seems to be controlled by the cfg.CONF.QUOTAS.quota_driver 
   config option: https://github.com/openstack/neutron/blob/6fa9142ced0eed8de9a89042747438b93de7202d/neutron/extensions/quotasv2_detail.py#L37

  Which means that there may be an (upstream) configuration that would
  end up with quota_details API missing. So a fallback mechanism may be
  due.

  Side note: it may be argued that neutron should not expose this config
  option in the first place. This bz doesn't attempt to address this
  request.

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