Open Stack

+1 agree with Zane here. While this is interesting a lot of Cloud providers will have either built or integrated their own custom Work Flow Engines, having an WFaaS API is the best place to start with first.

Alan

-----Original Message-----
From: Zane Bitter [mailto:zbitter at redhat.com] 
Sent: May-02-13 8:31 AM
To: openstack-dev at lists.openstack.org
Subject: Re: [openstack-dev] [Nova][Heat] scheduled-images blueprint

On 30/04/13 21:23, Russell Bryant wrote:
> Greetings,
>
> The following blueprint was proposed for the havana series:
>
>      https://blueprints.launchpad.net/nova/+spec/scheduled-images
>
> Based on the current design, I think the nova part of this needs to be 
> deferred.  It does not seem appropriate to add an API extension that 
> talks to a service that is not an integrated project, or at least incubated.
>
> Beyond that, I'm curious about the choice to implement this as a new 
> service.  I definitely agree that this is not something that should be 
> implemented inside of Nova.  However, I wonder if it makes sense as a 
> feature in Heat.  It seems like an orchestration feature.
>
> Thoughts?

This is a workflow (not orchestration) feature and would be solidly in-scope for a WFaaS API (e.g. the proposed https://wiki.openstack.org/wiki/Convection mentioned several times in this thread) in the form of a much more generic "cloud cron" type feature.

It certainly *could* be implemented in either Heat or Horizon, but there are pretty strong arguments for not doing so. We already have one example - Autoscaling - of something like this being too-tightly coupled into Heat, and we have a bunch of work ahead to try to tease the two apart so that everybody can get the benefits of Autoscaling, not just Heat template users. I wouldn't be in favour of creating another situation like that at this stage.

cheers,
Zane.

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