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[Inbar Stolberg <1804502@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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.

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

** Affects: nova
     Importance: Undecided
     Assignee: Inbar Stolberg (inbarsto)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => Inbar Stolberg (inbarsto)

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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):
  New

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.

  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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