Unnecessary "Instance not resizing, skipping migration" warning in n-cpu logs during live migration

Bug #1763043 reported by Matt Riedemann on 2018-04-11
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
OpenStack Compute (nova)
Medium
Matt Riedemann
Queens
Medium
Unassigned
Rocky
Medium
Unassigned

Bug Description

In a 7 day CI run, we have over 40K hits of this warning in the logs:

http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22Instance%20not%20resizing%2C%20skipping%20migration%5C%22%20AND%20tags%3A%5C%22screen-n-cpu.txt%5C%22&from=7d

http://logs.openstack.org/54/507854/4/gate/legacy-tempest-dsvm-multinode-live-migration/d723002/logs/subnode-2/screen-n-cpu.txt#_Apr_11_13_54_16_225676

Apr 11 13:54:16.225676 ubuntu-xenial-rax-dfw-0003443206 nova-compute[29642]: WARNING nova.compute.resource_tracker [None req-61a6f9c9-3355-4594-acfa-ebf31ba995aa tempest-LiveMigrationTest-1725408283 tempest-LiveMigrationTest-1725408283] [instance: 6f4923e3-bf1f-4cb7-bd37-00e5d437759e] Instance not resizing, skipping migration.

That warning was written back in 2012 when resize support was added to the resource tracker:

https://review.openstack.org/#/c/15799/

And since https://review.openstack.org/#/c/226411/ in 2015 it doesn't apply to evacuations.

We shouldn't see a warning in the nova-compute logs during a normal operation like a live migration, so we really should either just drop this down to debug or remove it completely.

Fix proposed to branch: master
Review: https://review.openstack.org/560467

Changed in nova:
status: Triaged → In Progress
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