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[Belmiro Moreira <1801897@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Getting the list of AVZs can take several seconds (~30 secs. in our case)
This is noticeable in Horizon when creating a new instance because the user can't select an AVZ until this completes.

workflow:
- get all services from all cells (~10000 for us)
- fetch all aggregates which are tagged as an AVZ
- construct a dict of {'service['host']: avz.value}
- return a dict of {'avz_value': list of hosts}
- separate available and not available zones.

Reproducible in Queens, Rocky

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1801897

Title:
  List AVZs can take several seconds

Status in OpenStack Compute (nova):
  New

Bug description:
  Getting the list of AVZs can take several seconds (~30 secs. in our case)
  This is noticeable in Horizon when creating a new instance because the user can't select an AVZ until this completes.

  workflow:
  - get all services from all cells (~10000 for us)
  - fetch all aggregates which are tagged as an AVZ
  - construct a dict of {'service['host']: avz.value}
  - return a dict of {'avz_value': list of hosts}
  - separate available and not available zones.

  Reproducible in Queens, Rocky

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