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[Vikram Hosakote <vhosakot@xxxxxxxxx>]

Public bug reported:

When the ImageNUMATopologyAsymmetric exception is raised by
https://github.com/openstack/nova/blob/master/nova/virt/hardware.py#L1265-L1268,
the nova CLI fails with the following error:

ERROR (BadRequest): Asymmetric NUMA topologies require explicit
assignment of CPUs and memory to nodes in image or flavor (HTTP 400)
(Request-ID: req-645017cd-d426-4e57-a2e9-587f1d5c84b7)

The above error message is not user-friendly at all in my opinion ;)

Instead, an error message like:

"(Number of vcpus of the flavor) modulus (numa_nodes) must be greater than zero, or,
 (Memory of the flavor) modulus (numa_nodes) must be greater than zero"

will be very useful to the user.

This error message will match the code in
https://github.com/openstack/nova/blob/master/nova/virt/hardware.py#L1265-L1268.

A better error message will help users set the right number of vcpus,
memory in the flavor and numa_nodes in order to boot a nova VM with NUMA
successfully.

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: numa

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https://bugs.launchpad.net/bugs/1704522

Title:
  Good error message is needed when ImageNUMATopologyAsymmetric is
  raised

Status in OpenStack Compute (nova):
  New

Bug description:
  When the ImageNUMATopologyAsymmetric exception is raised by
  https://github.com/openstack/nova/blob/master/nova/virt/hardware.py#L1265-L1268,
  the nova CLI fails with the following error:

  ERROR (BadRequest): Asymmetric NUMA topologies require explicit
  assignment of CPUs and memory to nodes in image or flavor (HTTP 400)
  (Request-ID: req-645017cd-d426-4e57-a2e9-587f1d5c84b7)

  The above error message is not user-friendly at all in my opinion ;)

  Instead, an error message like:

  "(Number of vcpus of the flavor) modulus (numa_nodes) must be greater than zero, or,
   (Memory of the flavor) modulus (numa_nodes) must be greater than zero"

  will be very useful to the user.

  This error message will match the code in
  https://github.com/openstack/nova/blob/master/nova/virt/hardware.py#L1265-L1268.

  A better error message will help users set the right number of vcpus,
  memory in the flavor and numa_nodes in order to boot a nova VM with
  NUMA successfully.

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