** 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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