Hi all. When I try to fix a bug:https://bugs.launchpad.net/nova/+bug/1242961, I get a trouble.
To reproduce the bug is very easy. Live migrate a vm in block_migration mode, and then delelte the vm immediately. The reason of this bug is as follow: 1. Because live migrate costs more time, so the vm will be deleted sucessfully before live migrate complete. And then, we will get an exception while live migrating. 2. After live migrate failed, we start to rollback. But, in the rollback method we will get or modify the info of vm from db. Because the vm has been deleted already, so we will get instance_not_found exception and rollback will be faild too. I have two ways to fix the bug: i)Add check in nova-api. When try to delete a vm, we return an error message if the vm_state is LIVE_MIGRATING. This way is very simple, but need to carefully consider. I have found a related discussion: http://lists.openstack.org/pipermail/openstack-dev/2013-October/017454.html, but it has no result in the discussion. ii)Before live migrate we get all the data needed by rollback method, and add a new rollback method. The new method will clean up resources at destination based on the above data(The resouces at source has been already cleaned up by deleting). I have no idea whitch one I should choose. Or, any other ideas?:) Regards, wanghong
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