openstack team mailing list archive

[Adrian Otto <adrian.otto@xxxxxxxxxxxxx>]

Glen,

I definitely recognize the value in having scheduling capability. I wrote a high level draft of a REST API for a generic scheduler to be used for batch job processing. Scheduled events are discussed regularly by users of queue systems that want certain things to happen on regular intervals. Considering that a scheduler function is useful, and could be used for many different services within the OpenStack system, I suggest thinking about a separate service that's dedicated to executing scheduled jobs that may need to interact with multiple services within OpenStack. This way it could be used to act upon not only /severs, but any other resource(s) in any service(s). Imbedding the functionality within nova is probably an architectural mistake. Filing a blueprint for a separate scheduler service sounds like a good idea.

Adrian

On Feb 16, 2011, at 2:02 PM, Glen Campbell wrote:

The proposed compute API 1.1 has a specification for server actions (Sec. 4.4) with the endpoint:

   /servers/{id}/action

The actual action is specified as the body of the POST request, and the implication is that the action is performed immediately, or as soon as possible.

I'd like us to consider changing this "action" resource into a "calendar" or perhaps "schedule" resource:

   /servers/{id}/schedule{/year{/month{/day{/hour{/minute}}}}}

This would provide a generalized way of performing actions on a scheduled basis.

For example, instead of having to wake up at 2AM to reboot a server (for whatever reason), the administrator could schedule that event:

   /servers/{id}/schedule/2011/2/17/02/00

By using the default resource (without the day or time specified), the meaning would be synonymous with the proposed "/action" resource; i.e., perform it NOW, or as soon as possible.

The schedule resource could have additional uses; for example, a GET request could return the currently-scheduled actions for a particular server.

Glen


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