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Zane Bitter wrote:
> On 19/12/17 22:15, Fei Long Wang wrote:
>>
>>
>> On 20/12/17 09:29, Joshua Harlow wrote:
>>> Zane Bitter wrote:
>>>> Getting off-topic, but since you walked in to this one ;)
>>>>
>>>> On 14/12/17 21:43, Matt Riedemann wrote:
>>>>> What are the real problems that the Nova team is not working on and
>>>>> apparently is a priority to everyone else in the OpenStack ecosystem
>>>>> but we are somehow oblivious?
>>>>
>>>> * Providing a secure channel to get credentials to guests so that
>>>> applications running on them can authenticate to OpenStack APIs.
>>>>
>>>> * Providing reliable, user-space notifications of events that may
>>>> require application or application-operator intervention (e.g. VM
>>>> reboot, hypervisor died, &c.).
>>>
>>> I'll add on.
>>>
>>> * Clear workflow state (and transition) 'machine' that is followed in
>>> code and can be used by operators/others such as UI developers to get
>>> a view on what nova is or is not doing (may fit under the broad topic
>>> of observability?)
>>>
>>> Take for example
>>> http://flower.readthedocs.io/en/latest/screenshots.html and ask
>>> yourself why nova-compute (or nova-conductor or nova-scheduler...)
>>> doesn't have an equivalent kind of 'viewer' (and no it doesn't need to
>>> be flower, that's just an example...)
>>>
>>
>> That's one of the changes we (at least me and Rob Cresswell) would like
>> to improve in Horizon. The idea is services (Nova, Cinder, Nutron, etc)
>> putting notifications into Zaqar queue and then Horizon can easily get
>> the resources status instead of doing stupid polling. And it could be
>> easily doing the thing shown on above link.
>
> What you're talking about is really an expansion of my second item
> above. What Josh means is using the taskflow library to co-ordinate all
> of the steps involved internally to Nova to boot an instance
> (scheduling, attaching volumes & ports, actually creating the VM, &c.) -
> it's not really a user-space thing.

I'm fine also with not using taskflow, just use something (vs nothing) ;)

>
> To answer the question from your other mail about user-space notifications:
>
>> We (Zaqar team) have been asked many times about this area but without a
>> support from more services, it's hard. I know Heat has some best
>> practice using Zaqar, is it possible to "copy" it to Nova/Cinder/Neutron?
>
> Sure, it would be dead easy, but Nova cores have made it abundantly
> clear that under no circumstances would they ever accept any code like
> this in Nova. Hence it's on this list.
>
> cheers,
> Zane.
>
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