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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

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

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

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

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

** Changed in: nova/train
       Status: New => In Progress

** Changed in: nova/queens
       Status: New => Triaged

** Changed in: nova/rocky
       Status: New => Triaged

** Changed in: nova/stein
       Status: New => Triaged

** Changed in: nova/queens
   Importance: Undecided => Low

** Changed in: nova/stein
   Importance: Undecided => Medium

** Changed in: nova/rocky
   Importance: Undecided => Medium

** Changed in: nova/train
     Assignee: (unassigned) => sean mooney (sean-k-mooney)

** Changed in: nova/train
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1804502

Title:
  Rebuild server with NUMATopologyFilter enabled fails (in some cases)

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) queens series:
  Triaged
Status in OpenStack Compute (nova) rocky series:
  Triaged
Status in OpenStack Compute (nova) stein series:
  Triaged
Status in OpenStack Compute (nova) train series:
  In Progress

Bug description:
  Description
  ===========
  server rebuild will fail in nova scheduler on NUMATopologyFilter if the computes do not have enough capacity (even though clearly the running server is already accounted into that calculation)

  to resolve the issue a fix is required in NUMATopologyFilter to not
  perform the rebuild operation in the case that the request is due to
  rebuild.

  the result of such a case will be that server rebuild will fail with
  error of "no valid host found"

  (do not mix resize with rebuild functions...)

  Steps to reproduce
  ==================

  1. create a flavor that contain metadata that will point to a specific compute (use host aggregate with same key:value metadata
  make sure flavor contain topology related metadata:
  hw:cpu_cores='1', hw:cpu_policy='dedicated', hw:cpu_sockets='6', hw:cpu_thread_policy='prefer', hw:cpu_threads='1', hw:mem_page_size='large', location='area51'

  2. create a server on that compute (preferably using heat stack)
  3. (try to) rebuild the server using stack update
  4. issue reproduced

  Expected result
  ===============
  server in an active running state (if image was replaced in the rebuild command than with a reference to the new image in the server details.

  Actual result
  =============
  server in error state with error of no valid host found.

  Message
  No valid host was found. There are not enough hosts available.
  Code
  500
  Details
  File "/usr/lib/python2.7/site-packages/nova/conductor/manager.py", line 966, in rebuild_instance return_alternates=False) File "/usr/lib/python2.7/site-packages/nova/conductor/manager.py", line 723, in _schedule_instances return_alternates=return_alternates) File "/usr/lib/python2.7/site-packages/nova/scheduler/utils.py", line 907, in wrapped return func(*args, **kwargs) File "/usr/lib/python2.7/site-packages/nova/scheduler/client/__init__.py", line 53, in select_destinations instance_uuids, return_objects, return_alternates) File "/usr/lib/python2.7/site-packages/nova/scheduler/client/__init__.py", line 37, in __run_method return getattr(self.instance, __name)(*args, **kwargs) File "/usr/lib/python2.7/site-packages/nova/scheduler/client/query.py", line 42, in select_destinations instance_uuids, return_objects, return_alternates) File "/usr/lib/python2.7/site-packages/nova/scheduler/rpcapi.py", line 158, in select_destinations return cctxt.call(ctxt, 'select_destinations', **msg_args) File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/client.py", line 179, in call retry=self.retry) File "/usr/lib/python2.7/site-packages/oslo_messaging/transport.py", line 133, in _send retry=retry) File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 584, in send call_monitor_timeout, retry=retry) File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 575, in _send raise result

  Environment
  ===========
  detected in Rocky release

  KVM hypervisor

  Ceph storage

  Neutron networks

  Logs & Configs
  ==============
  in nova.conf:
  enabled_filters=AggregateInstanceExtraSpecsFilter,RetryFilter,AvailabilityZoneFilter,NUMATopologyFilter,PciPassthroughFilter,RamFilter,ComputeFilter,ImagePropertiesFilter,CoreFilter,ServerGroupAntiAffinityFilter,ServerGroupAffinityFilter,DiskFilter,ComputeCapabilitiesFilter,AggregateRamFilter,SameHostFilter,DifferentHostFilter

  logs: tbd

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