Liberty has hit the EOL, so this one is invalid. Mitaka was removed from
affected releases, so I am closing this one.
** Changed in: nova
Status: In Progress => Won't Fix
** Changed in: nova/liberty
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/1488111
Title:
Boot from volumes that fail in initialize_connection are not
rescheduled
Status in OpenStack Compute (nova):
Won't Fix
Status in OpenStack Compute (nova) liberty series:
Won't Fix
Bug description:
Version: OpenStack Liberty
Boot from volumes that fail in volume initialize_connection are not
rescheduled. Initialize connection failures can be very host-specific
and in many cases the boot would succeed if the instance build was
rescheduled to another host.
The instance is not rescheduled because the initialize_connection is being
called down this stack:
nova.compute.manager _build_resources
nova.compute.manager _prep_block_device
nova.virt.block_device attach_block_devices
nova.virt.block_device.DriverVolumeBlockDevice.attach
When this fails an exception is thrown which lands in this block:
https://github.com/openstack/nova/blob/master/nova/compute/manager.py#L1740
and throws an InvalidBDM exception which is caught by this block:
https://github.com/openstack/nova/blob/master/nova/compute/manager.py#L2110
this in turn throws a BuildAbortException which causes the instance to not be
rescheduled by landing the flow in this block:
https://github.com/openstack/nova/blob/master/nova/compute/manager.py#L2004
To fix this we likely need a different exception thrown from
nova.virt.block_device.DriverVolumeBlockDevice.attach when the failure
is in initialize_connection and then work back up the stack to ensure
that when this different exception is thrown a BuildAbortException is
not thrown so the reschedule can happen.
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