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[Balazs Gibizer <balazs.gibizer@xxxxxxxx>]

Public bug reported:

This is only observed on stable/pike.

Reproduce
---------
* Create an aggregate mapped to an availability zone
* Add one host to the aggregate
* Make sure (e.g. with fault injection) that the nova-compute on the host in the aggregate will fail during the instance_claim process to trigger re-schedule
* boot an instance requesting the az

Expected
--------
Instance boot fails with NoValidHost

Actual
------
Instance is rescheduled and the scheduler ignores the requested az and therefore instance is booted outside of the requested az.

** Affects: nova
     Importance: Undecided
         Status: New

** Affects: nova/pike
     Importance: Medium
     Assignee: Balazs Gibizer (balazs-gibizer)
         Status: Triaged


** Tags: scheduler

** Also affects: nova/pike
   Importance: Undecided
       Status: New

** Changed in: nova/pike
     Assignee: (unassigned) => Balazs Gibizer (balazs-gibizer)

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https://bugs.launchpad.net/bugs/1852207

Title:
  reschedule ignores requested availability zone

Status in OpenStack Compute (nova):
  New
Status in OpenStack Compute (nova) pike series:
  Triaged

Bug description:
  This is only observed on stable/pike.

  Reproduce
  ---------
  * Create an aggregate mapped to an availability zone
  * Add one host to the aggregate
  * Make sure (e.g. with fault injection) that the nova-compute on the host in the aggregate will fail during the instance_claim process to trigger re-schedule
  * boot an instance requesting the az

  Expected
  --------
  Instance boot fails with NoValidHost

  Actual
  ------
  Instance is rescheduled and the scheduler ignores the requested az and therefore instance is booted outside of the requested az.

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