Matt Riedemann 750aef54b1 Add finish_revert_snapshot_based_resize_at_source compute method ...

This adds the finish_revert_snapshot_based_resize_at_source() method
to the compute service. This completes the cross-cell resize revert
on the source host by updating port bindings, re-connecting volumes
and spawning the guest and waiting for the network-vif-plugged
event from neutron.

If the resize started with a stopped instance, the revert ensures
the guest is powered off when it is spawned.

The instance record is updated with the old_flavor information,
allocations are reverted in placement, and the migration status in
the source cell database is updated to "reverted".

Notifications are not sent from this method like in the
finish_revert_resize() method because those will be sent from
conductor.

Note that this implementation tries to be a bit more graceful
about error handling than the old same-cell finish_revert_resize
method since there are a lot of moving parts and we want to try
to clean up as much as possible.

Part of blueprint cross-cell-resize

Change-Id: I7e7afddbd9e0f57dfb1175a0bb2b54f2ed5500f2

2019-12-12 12:00:33 -05:00

68 KiB

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