[openstack-dev] [heat][mistral] EventScheduler vs Mistral scheduling

Renat Akhmerov rakhmerov at mirantis.com
Thu Nov 14 10:29:07 UTC 2013

As for EventScheduler proposal, I think it actually fits Mistral model very well. What described in EvenScheduler is basically the ability to configure webhooks to be called periodically or at a certain time. First of all, from the very beginning the concept of scheduling has been considered a very important capability of Mistral. And from Mistral perspective calling a webhook is just a workflow consisting of one task. In order to simplify consumption of the service we can implement API methods to work specifically with webhooks in a convenient way (without providing any workflow definitions using DSL etc.). I have already suggested before that we can provide API shortcuts for scheduling individual tasks rather than complex workflows so it has an adjacent meaning.

I other words, I now tend to think it doesn’t make sense to have EventScheduler a standalone service.

What do you think?


On 13 Nov 2013, at 06:39, Angus Salkeld <asalkeld at redhat.com> wrote:

> On 12/11/13 15:13 -0800, Christopher Armstrong wrote:
>> Given the recent discussion of scheduled autoscaling at the summit session
>> on autoscaling, I looked into the state of scheduling-as-a-service in and
>> around OpenStack. I found two relevant wiki pages:
>> https://wiki.openstack.org/wiki/EventScheduler
>> https://wiki.openstack.org/wiki/Mistral/Cloud_Cron_details
>> The first one proposes and describes in some detail a new service and API
>> strictly for scheduling the invocation of webhooks.
>> The second one describes a part of Mistral (in less detail) to basically do
>> the same, except executing taskflows directly.
>> Here's the first question: should scalable cloud scheduling exist strictly
>> as a feature of Mistral, or should it be a separate API that only does
>> event scheduling? Mistral could potentially make use of the event
>> scheduling API (or just rely on users using that API directly to get it to
>> execute their task flows).
>> Second question: if the proposed "EventScheduler" becomes a real project,
>> which OpenStack Program should it live under?
>> Third question: Is anyone actively working on this stuff? :)
> Your work mates;) https://github.com/rackerlabs/qonos
> how about merge qonos into mistral, or at lest put it into stackforge?
> -Angus
>> -- 
>> IRC: radix
>> Christopher Armstrong
>> Rackspace
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