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[Chris Dent <cdent+lp@xxxxxxxxxxxxx>]

Public bug reported:

(master as of 2017-08-15)

If the merge of two resources of the same class can result in a sum of
zero, or one of the provided keys has a value of zero in the first place
and it is only in one of the provided resource dicts, the result dict of
resources will have a zero value entry. If this is then used directly to
produce an allocations entry, the allocation will fail.

I discovered this while manually testing resizes of servers using
flavors with no disk.

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: resource-tracker scheduler

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https://bugs.launchpad.net/bugs/1710908

Title:
  scheduler.utils.merge_resources allows zero value resources

Status in OpenStack Compute (nova):
  New

Bug description:
  (master as of 2017-08-15)

  If the merge of two resources of the same class can result in a sum of
  zero, or one of the provided keys has a value of zero in the first
  place and it is only in one of the provided resource dicts, the result
  dict of resources will have a zero value entry. If this is then used
  directly to produce an allocations entry, the allocation will fail.

  I discovered this while manually testing resizes of servers using
  flavors with no disk.

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