** Also affects: nova/rocky
Importance: Undecided
Status: New
** Changed in: nova/rocky
Status: New => Confirmed
** Changed in: nova/rocky
Importance: Undecided => Low
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https://bugs.launchpad.net/bugs/1785327
Title:
schedule_and_build_instances looks up host az for every instance even
if using the same host
Status in OpenStack Compute (nova):
Fix Released
Status in OpenStack Compute (nova) pike series:
Confirmed
Status in OpenStack Compute (nova) queens series:
Confirmed
Status in OpenStack Compute (nova) rocky series:
In Progress
Bug description:
This is a simple performance optimization bug. When creating multiple
servers, if they are in an affinity group they are going to be on the
same host. Or if simply the scheduler configuration is such that
instances are packed onto as few hosts as possible rather than spread,
the scheduler could return several of the same hosts for the list of
instances being scheduled. We iterate over the instances and their
selected hosts and we lookup the az for each host in the loop which is
a query to the aggregates table in the API DB. If we have >1 of the
same host in the list, we could optimize this by simply caching the
host=az mapping.
https://github.com/openstack/nova/blob/4c37ff72e5446c835a48d569dd5a1416fcd36c71/nova/conductor/manager.py#L1263
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