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[Hans Lindgren <1641413@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

During construction of an instance object from db info, a call to
_from_db_object() is made. In many situations this results in one or
more unnecessary db calls due to the way instance extras are handled.

This occurs when the following two conditions apply; (1) the
'expected_attrs' parameter contains one of the affected instance_extras
fields (see below) and (2) the corresponding value in the provided
db_instance data either does not exist or else contains None.

The affected instance extras fields are:
 - numa_topology
 - pci_requests
 - device_metadata
 - vcpu_model

** Affects: nova
     Importance: Medium
     Assignee: Hans Lindgren (hanlind)
         Status: New


** Tags: unified-objects

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https://bugs.launchpad.net/bugs/1641413

Title:
  Unnecessary db traffic when constructing instance object from db info

Status in OpenStack Compute (nova):
  New

Bug description:
  During construction of an instance object from db info, a call to
  _from_db_object() is made. In many situations this results in one or
  more unnecessary db calls due to the way instance extras are handled.

  This occurs when the following two conditions apply; (1) the
  'expected_attrs' parameter contains one of the affected
  instance_extras fields (see below) and (2) the corresponding value in
  the provided db_instance data either does not exist or else contains
  None.

  The affected instance extras fields are:
   - numa_topology
   - pci_requests
   - device_metadata
   - vcpu_model

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