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[Yun Mao <yunmao@xxxxxxxxx>]

Hi Jay et al,

there is a patch in review here to overhaul the state machine:

https://review.openstack.org/#/c/8254/

All transient state in vm state will be moved to task state. Stable
state in task state (RESIZE_VERIFY) will be moved to vm state. There
is also a state transition diagram in dot format.

Comments welcome. Thanks,

All

On Mon, Jun 18, 2012 at 12:26 PM, Jay Pipes <jaypipes@xxxxxxxxx> wrote:
> On 06/18/2012 12:01 PM, David Kranz wrote:
>>
>> There are a few tempest tests, and many in the old kong suite that is
>> still there, that wait for a server status that is something other than
>> ACTIVE or VERIFY_RESIZE. These other states, such as BUILD or REBOOT,
>> are transient so I don't understand why it is correct for code to poll
>> for those states. Am I missing something or do those tests have race
>> condition bugs?
>
>
> No, you are correct, and I have made some comments in recent code reviews to
> that effect.
>
> Here are all the task states:
>
> https://github.com/openstack/nova/blob/master/nova/compute/task_states.py
>
> Out of all those task states, I believe the only one safe to poll in a wait
> loop is RESIZE_VERIFY. All the others are prone to state transitions outside
> the control of the user.
>
> For the VM states:
>
> https://github.com/openstack/nova/blob/master/nova/compute/vm_states.py
>
> I consider the following to be non-racy, quiescent states:
>
> ACTIVE
> DELETED
> STOPPED
> SHUTDOFF
> PAUSED
> SUSPENDED
> ERROR
>
> I consider the following to be racy states that should not be tested for:
>
> MIGRATING -- Instead, the final state should be checked for...
> RESIZING -- Instead, the RESIZE_VERIFY and RESIZE_CONFIRM task states should
> be checked
>
> I have absolutely no idea what the state termination is for the following VM
> states:
>
> RESCUED -- is this a permanent state? Is this able to be queried for in a
> consistent manner before it transitions to some further state?
>
> SOFT_DELETE -- I have no clue what the purpose or queryability of this state
> is, but would love to know...
>
> Best,
> -jay
>
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