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[xhzhf <guoyongxhzhf@xxxxxxx>]

Public bug reported:

Description
===========
server-group can force instances to place on same host or different host.
but it can not force servers to place on same node or different node.
Node concept represent true hypervisor.
if we can not force  instances to hypervisor, server-group is less meaningful.
After all, nova-compute can map to multi-node.

Steps to reproduce
==================
after creating server-group, we boot two instances

nova boot diffCVKVnf1 --flavor 2b32765a-93ef-4bdd-95cc-3203477dedb7
--image cb0d7033-7818-481d-9cfe-700769eac740 --availability-zone
"nova:CentOS7Kilo:CVM192.168.12.52(cvk1252)" --nic net-
id=4fe8add8-82a5-4c0b-b104-cbee13f72a77 --hint group=21bf6740-71d7-4fdb-
ae96-d3fa254e2daa


nova boot diffCVKVnf2 --flavor 2b32765a-93ef-4bdd-95cc-3203477dedb7 --image cb0d7033-7818-481d-9cfe-700769eac740 --availability-zone "nova:CentOS7Kilo:CVM192.168.12.52(cvk1253)" --nic net-id=4fe8add8-82a5-4c0b-b104-cbee13f72a77 --hint group=21bf6740-71d7-4fdb-ae96-d3fa254e2daa


Expected result
===============
creations are successful

Actual result
=============
the second creation failed
Build of instance 1a94a6dc-ba3d-4190-8417-973ffe6609a6 was re-scheduled: Build of instance 1a94a6dc-ba3d-4190-8417-973ffe6609a6 was re-scheduled: Anti-affinity instance group policy was violated.

Environment
===========
openstack version: Mitaka
CentOS7Kilo host have two nodes: CVM192.168.12.52(cvk1253), CVM192.168.12.52(cvk1252)


Code Analysis
==============
affinity_filter is supporting server-group to node level.
so filter is all alright
but when nova-compute validate server-group, it use instances of host to validate.
related function: 
nova/compute/manager.py:_do_validation
nova/objects/instance_group.py: get_hosts

** Affects: nova
     Importance: Undecided
     Assignee: xhzhf (guoyongxhzhf)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => xhzhf (guoyongxhzhf)

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https://bugs.launchpad.net/bugs/1621716

Title:
  [server-group] server-group feature can not support multi-node pattern

Status in OpenStack Compute (nova):
  New

Bug description:
  Description
  ===========
  server-group can force instances to place on same host or different host.
  but it can not force servers to place on same node or different node.
  Node concept represent true hypervisor.
  if we can not force  instances to hypervisor, server-group is less meaningful.
  After all, nova-compute can map to multi-node.

  Steps to reproduce
  ==================
  after creating server-group, we boot two instances

  nova boot diffCVKVnf1 --flavor 2b32765a-93ef-4bdd-95cc-3203477dedb7
  --image cb0d7033-7818-481d-9cfe-700769eac740 --availability-zone
  "nova:CentOS7Kilo:CVM192.168.12.52(cvk1252)" --nic net-
  id=4fe8add8-82a5-4c0b-b104-cbee13f72a77 --hint group=21bf6740-71d7
  -4fdb-ae96-d3fa254e2daa

  
  nova boot diffCVKVnf2 --flavor 2b32765a-93ef-4bdd-95cc-3203477dedb7 --image cb0d7033-7818-481d-9cfe-700769eac740 --availability-zone "nova:CentOS7Kilo:CVM192.168.12.52(cvk1253)" --nic net-id=4fe8add8-82a5-4c0b-b104-cbee13f72a77 --hint group=21bf6740-71d7-4fdb-ae96-d3fa254e2daa


  Expected result
  ===============
  creations are successful

  Actual result
  =============
  the second creation failed
  Build of instance 1a94a6dc-ba3d-4190-8417-973ffe6609a6 was re-scheduled: Build of instance 1a94a6dc-ba3d-4190-8417-973ffe6609a6 was re-scheduled: Anti-affinity instance group policy was violated.

  Environment
  ===========
  openstack version: Mitaka
  CentOS7Kilo host have two nodes: CVM192.168.12.52(cvk1253), CVM192.168.12.52(cvk1252)

  
  Code Analysis
  ==============
  affinity_filter is supporting server-group to node level.
  so filter is all alright
  but when nova-compute validate server-group, it use instances of host to validate.
  related function: 
  nova/compute/manager.py:_do_validation
  nova/objects/instance_group.py: get_hosts

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