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[OpenStack Infra <1647316@xxxxxxxxxxxxxxxxxx>]

Fix proposed to branch: stable/newton
Review: https://review.openstack.org/416764

** Changed in: nova/newton
       Status: New => In Progress

** Changed in: nova/newton
     Assignee: (unassigned) => Matt Riedemann (mriedem)

** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1647316

Title:
  scheduler report client sends allocations with value of zero,
  violating min_unit

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) newton series:
  In Progress

Bug description:
  
  When a VM boots using non-local disk, it tries to send an allocation of 'DISK_GB': 0. This violates the default min_unit of 1 and causes an error that looks like this:

  [req-858cbed4-c113-45e8-94e3-1d8ee64f9de0 488c2b05a66b441199f4c1dca7accd5b 3fa5b55ecc154427b636119f0920d252 - default default] Bad inventory
  Traceback (most recent call last):
    File "/usr/lib/python2.7/site-packages/nova/api/openstack/placement/handlers/allocation.py", line 253, in set_allocations
      allocations.create_all()
    File "/usr/lib/python2.7/site-packages/oslo_versionedobjects/base.py", line 226, in wrapper
      return fn(self, *args, **kwargs)
    File "/usr/lib/python2.7/site-packages/nova/objects/resource_provider.py", line 1050, in create_all
      self._set_allocations(self._context, self.objects)
    File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/enginefacade.py", line 894, in wrapper
      return fn(*args, **kwargs)
    File "/usr/lib/python2.7/site-packages/nova/objects/resource_provider.py", line 1011, in _set_allocations
      before_gens = _check_capacity_exceeded(conn, allocs)
    File "/usr/lib/python2.7/site-packages/nova/objects/resource_provider.py", line 921, in _check_capacity_exceeded
      resource_provider=rp_uuid)
  InvalidAllocationConstraintsViolated: Unable to create allocation for 'DISK_GB' on resource provider 'f9398126-d0e8-4cf8-ae45-9103a88aa13d'. The requested amount would violate inventory constraints.

  The causing code is at
  https://github.com/openstack/nova/blob/474c2ef28234dacc658e9a78762cac66ef7fe334/nova/scheduler/client/report.py#L105

  The correct fix is probably that whenever the value of any resource
  class is zero, don't send that resource class in the dict.

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