openstack team mailing list archive

[Joe Gordon <jogo@xxxxxxxxxxxxxxxx>]

On Wed, Apr 3, 2013 at 7:05 PM, Chris Behrens <cbehrens@xxxxxxxxxxxx> wrote:

> I'm having a hard time understanding the original problem.  nova boot
> should return in milliseconds.  There's no blocking on provisioning.
>
>
The only thing that could block is DB access, as AFAIK the RPC to the
scheduler is still pass by reference.

- Chris
>
> On Apr 3, 2013, at 8:32 PM, Rafael Rosa <rafaelrosafu@xxxxxxxxx> wrote:
>
> API wise I was thinking about something like "nova boot
> --custom-instance-uuid ABC..." or something like that. To avoid problems
> with any current implementation I would set it to disabled by default and
> add a config option to enable it.
>
> As for collisions, my take is that if you're passing a custom UUID you
> know what you're doing and is generating them in a way that won't be
> duplicated. Just by using standard UUID generators the possibility of
> collisions are really really small.
>
> Thanks for the feeback :)
>
> Rafael Rosa Fu
>
>
> 2013/4/3 Michael Still <mikal@xxxxxxxxxxx>
>
>> On Thu, Apr 4, 2013 at 9:16 AM, Rafael Rosa <rafaelrosafu@xxxxxxxxx>
>> wrote:
>> > Hi,
>> >
>> > In our OpenStack installation we have an issue when creating new
>> instances,
>> > we need to execute some long running processes before calling "nova
>> boot"
>> > and the call blocks for the end user for a while. We would like to
>> return
>> > "immediately" to the caller with a final instance UUID and do the work
>> on
>> > the background, but it's only generated when during actual instance
>> > creation, which is a no go in our situation.
>>
>> The instance_create database call already accepts an instance UUID as
>> an argument, so that bit looks like it should work out well for you.
>> So, I guess this is mostly a case of working out how you want the API
>> to work.
>>
>> Personally, I would have no problem with something like this, so long
>> as we could somehow "reserve" the instance UUID so that another caller
>> doesn't try and create an instance with the same UUID while you're
>> doing your slow thing.
>>
>> Cheers,
>> Michael
>>
>
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