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[Jay Lau <jay.lau.513@xxxxxxxxx>]

** Changed in: nova
       Status: In Progress => Invalid

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https://bugs.launchpad.net/bugs/1269655

Title:
  Make prune compute_node_stats configurable

Status in OpenStack Compute (Nova):
  Invalid

Bug description:
  
  In compute/manager.py, there is a periodic task named as update_available_resource(), it will update resource for each compute periodically.

   @periodic_task.periodic_task
      def update_available_resource(self, context):
          """See driver.get_available_resource()

          Periodic process that keeps that the compute host's understanding of
          resource availability and usage in sync with the underlying hypervisor.

          :param context: security context
          """
          new_resource_tracker_dict = {}
          nodenames = set(self.driver.get_available_nodes())
          for nodename in nodenames:
              rt = self._get_resource_tracker(nodename)
              rt.update_available_resource(context) <<<<<<<<<< Update here
              new_resource_tracker_dict[nodename] = rt

  In resource_tracker.py,
  https://github.com/openstack/nova/blob/master/nova/compute/resource_tracker.py#L384

  self._update(context, resources, prune_stats=True)

  It always set prune_stats as True, this caused some problems. As if
  someone put some metrics to compute_node_stats table, and if those
  metrics does not change frequently, the periodic task will prune the
  new metrics.

  It is better adding a configuration parameter in nova.cont to make
  prune_stats as configurable.

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