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<div>I like idea of scheduling actions overall. The idea of a generic scheduling service also appeals to me a lot. The question is how do you generalize the service. I'd love to see your write up.</div>
<div>-jOrGe W.</div>
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<div>On Feb 16, 2011, at 4:35 PM, Adrian Otto wrote:</div>
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Glen,
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<div>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.</div>
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<div>Adrian</div>
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<div>On Feb 16, 2011, at 2:02 PM, Glen Campbell wrote:</div>
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<span style="font-size: 10.5pt; color: black; font-family: Calibri, sans-serif; ">The proposed compute API 1.1 has a specification for server actions (Sec. 4.4) with the endpoint:<o:p></o:p></span></div>
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<span class="apple-style-span"><span style="font-size: 9pt; font-family: Courier; color: black; "> /servers/{id}/action</span></span><span style="font-size: 10.5pt; color: black; font-family: Calibri, sans-serif; "><o:p></o:p></span></div>
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<span style="font-size: 10.5pt; color: black; font-family: Calibri, sans-serif; ">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.<o:p></o:p></span></div>
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<span style="font-size: 10.5pt; color: black; font-family: Calibri, sans-serif; ">I'd like us to consider changing this "action" resource into a "calendar" or perhaps "schedule" resource:<o:p></o:p></span></div>
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<span class="apple-style-span"><span style="font-size: 9pt; font-family: Courier; color: black; "> /servers/{id}/schedule{/year{/month{/day{/hour{/minute}}}}}</span></span><span style="font-size: 10.5pt; color: black; font-family: Calibri, sans-serif; "><o:p></o:p></span></div>
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<span style="font-size: 10.5pt; color: black; font-family: Calibri, sans-serif; ">This would provide a generalized way of performing actions on a scheduled basis.<o:p></o:p></span></div>
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<span style="font-size: 10.5pt; color: black; font-family: Calibri, sans-serif; ">For example, instead of having to wake up at 2AM to reboot a server (for whatever reason), the administrator could schedule that event:<o:p></o:p></span></div>
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<span class="apple-style-span"><span style="font-size: 9pt; font-family: Courier; color: black; "> /servers/{id}/schedule/2011/2/17/02/00</span></span><span style="font-size: 10.5pt; color: black; font-family: Calibri, sans-serif; "><o:p></o:p></span></div>
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<span style="font-size: 10.5pt; color: black; font-family: Calibri, sans-serif; ">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.<o:p></o:p></span></div>
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<span style="font-size: 10.5pt; color: black; font-family: Calibri, sans-serif; "><o:p> </o:p></span></div>
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<span style="font-size: 10.5pt; color: black; font-family: Calibri, sans-serif; ">The schedule resource could have additional uses; for example, a GET request could return the currently-scheduled actions for a particular server.</span></div>
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<span style="font-size: 10.5pt; color: black; font-family: Calibri, sans-serif; ">Glen</span></div>
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