Open Stack

Greeting,

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 for me. As now
I'm putting some metrics to compute_node_stats table, those metrics does
not change frequently, so I did not update it frequently. But the periodic
task always prune the new metrics that I added.

What about add a configuration parameter in nova.cont to make prune_stats
as configurable?

Thanks,

Jay
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