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Hi David,

Yes there is a plan to change that for Folsom. vm_state will be purely
stable state and task_state will be purely for transition state. See
http://wiki.openstack.org/VMState for the new design rational of
(power_state, vm_state, task_state)

After the cleanup, vm_state will have

ACTIVE = 'active'  # VM is running
BUILDING = 'building'  # VM only exists in DB
PAUSED = 'paused'
SUSPENDED = 'suspended'  # VM is suspended to disk.
STOPPED = 'stopped'  # VM is powered off, the disk image is still there.
RESCUED = 'rescued'  # A rescue image is running with the original VM image
# attached.
RESIZED = 'resized'  # a VM with the new size is active. The user is expected
# to manually confirm or revert.
SOFT_DELETED = 'soft-delete'  # VM is marked as deleted but the disk images are
# still available to restore.
DELETED = 'deleted'  # VM is permanently deleted.
ERROR = 'error'

There is no SHUTOFF (merged with STOPPED), and VERIFY_RESIZE is named
(from task state) as RESIZED (in vm state). BUILDING state is not my
favorite but it's left there mostly for backward compatibility reason.

This is still up for discussion and your input is welcome. Thanks,

Yun

On Mon, Jun 18, 2012 at 3:54 PM, David Kranz <david.kranz at qrclab.com> wrote:
> Thanks, Yun. The problem is that the API calls give you status which is
> neither task state nor vm state. I think these are the stable states:
>
> ACTIVE, VERIFY_RESIZE, STOPPED, SHUTOFF, PAUSED, SUSPENDED, RESCUE, ERROR,
> DELETED
>
> Does that seem right to you, and is there a plan to change that set for
> Folsom?
>
>  -David
>
>
>
>
>
> On 6/18/2012 12:51 PM, Yun Mao wrote:
>>
>> 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 at gmail.com>  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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