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[Ben Nemec <openstack@xxxxxxxxxxxx>]

Public bug reported:

When looking at hypervisor resources through either nova hypervisor-
stats or nova hypervisor-show with compute nodes of differing sizes, I
am getting incorrect/inconsistent values back for one of the
hypervisors.  For example, in an environment with one 32 GB compute node
and one 16 GB node, I see the following when running nova hypervisor-
show multiple times on the 32 GB node:

$ nova hypervisor-show 1 | grep memory_mb
| memory_mb                 | 15934                                    |
| memory_mb_used            | 20992                                    |
$ nova hypervisor-show 1 | grep memory_mb
| memory_mb                 | 31906                                    |
| memory_mb_used            | 20992                                    |

hypervisor-stats shows similar incorrect behavior:

$ nova hypervisor-stats | grep memory_mb
| memory_mb            | 31868 |
| memory_mb_used       | 34304 |
$ nova hypervisor-stats | grep memory_mb
| memory_mb            | 63812 |
| memory_mb_used       | 34304 |

>From what I can tell, the same stats are being returned for both
hypervisors, but which node's stats are being used randomly changes.

This particular environment is a two node devstack setup built today,
but I've seen similar behavior in a three compute TripleO deployment
using recent builds of Nova for at least a couple of weeks.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1585826

Title:
  nova hypervisor-show/stats reports incorrect values

Status in OpenStack Compute (nova):
  New

Bug description:
  When looking at hypervisor resources through either nova hypervisor-
  stats or nova hypervisor-show with compute nodes of differing sizes, I
  am getting incorrect/inconsistent values back for one of the
  hypervisors.  For example, in an environment with one 32 GB compute
  node and one 16 GB node, I see the following when running nova
  hypervisor-show multiple times on the 32 GB node:

  $ nova hypervisor-show 1 | grep memory_mb
  | memory_mb                 | 15934                                    |
  | memory_mb_used            | 20992                                    |
  $ nova hypervisor-show 1 | grep memory_mb
  | memory_mb                 | 31906                                    |
  | memory_mb_used            | 20992                                    |

  hypervisor-stats shows similar incorrect behavior:

  $ nova hypervisor-stats | grep memory_mb
  | memory_mb            | 31868 |
  | memory_mb_used       | 34304 |
  $ nova hypervisor-stats | grep memory_mb
  | memory_mb            | 63812 |
  | memory_mb_used       | 34304 |

  From what I can tell, the same stats are being returned for both
  hypervisors, but which node's stats are being used randomly changes.

  This particular environment is a two node devstack setup built today,
  but I've seen similar behavior in a three compute TripleO deployment
  using recent builds of Nova for at least a couple of weeks.

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