*** This bug is a duplicate of bug 1729621 ***
https://bugs.launchpad.net/bugs/1729621
** This bug has been marked a duplicate of bug 1729621
Inconsistent value for vcpu_used
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https://bugs.launchpad.net/bugs/1704179
Title:
Too many period db actions in large scale clusters increase the load
of database
Status in OpenStack Compute (nova):
In Progress
Bug description:
Too many period db actions in large scale clusters increase the load
of database, especially un-necessary db update or query.
For example， over 1000 nodes, it will be 2 * 1000=2000 db update for
compute_node table in 60s in _update_available_resource, but this two
db update is not necessary if resource usage not changed.
Delete the first and second _update() in _init_compute_node can
reduce two db update for one node in 60s, if resource usage not
changed for this compute_node.
Then the funtion self._resource_change(compute_node) in _update() make
sense
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