Comment 4 for bug 1793768

Reviewed: https://review.openstack.org/605533
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=220796807396ad6aa8cc8f1fc9ff905253681896
Submitter: Zuul
Branch: stable/rocky

commit 220796807396ad6aa8cc8f1fc9ff905253681896
Author: Matt Riedemann <email address hidden>
Date: Fri Sep 21 10:44:51 2018 -0400

    Ignore VirtDriverNotReady in _sync_power_states periodic task

    Change Ib0ec1012b74e9a9e74c8879f3feed5f9332b711f introduced
    a new VirtDriverNotReady exception which the ironic driver raises
    when asked to retrieve a list of nodes and ironic-api is not
    available, like if nova-compute is started before ironic-api.
    This is normal and meant to be self-healing, but we can get it
    in other periodic tasks besides update_available_resource which
    leads to ugly exception traces on startup in the logs. This adds
    handling for the exception in the _sync_power_states periodic
    task.

    Change-Id: Iaf29b9e7a92705ac8a2e7ef338b92f7f1203506d
    Closes-Bug: #1793768
    (cherry picked from commit 6eb32bc40340fed631b9fce1245326e0ebc1c540)