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[Sean Dague <sean@xxxxxxxxx>]

** Tags added: note-to-self

** Changed in: nova
       Status: New => Opinion

** Changed in: nova
   Importance: Undecided => Wishlist

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https://bugs.launchpad.net/bugs/1659647

Title:
  The resource tracker clears the tracked_instances dictionary on every
  periodic job

Status in OpenStack Compute (nova):
  Opinion

Bug description:
  The resource tracker has a dict, named 'tracked_instances' which based
  on the name is used to keep track of the instances that the resource
  tracker is tracking.

  However, on every run of the 'update_available_resource' method, the
  '_update_usage_from_instances' method is called and in there the
  tracked_instances dict is cleared. This means that the conditionals in
  the '_update_usage_from_instance' (singular) method always indicate
  that the current instance is considered new and the various update
  methods for that instance will always be called.

  In the case of the calls to the placement API, this means there are
  many extra calls which could be avoided.

  Removing the clear() call results in no unit or functional test
  failures. A test run the gate will be tried.

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