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<div style="font-family: Calibri, sans-serif; font-size: 14px;">Hi Tim, </div>
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<div style="font-family: Calibri, sans-serif; font-size: 14px;">I posted this comment on the doc. I am still pondering over a possibility of have a policy-driven scheduler workflow via the Solver Scheduler placement engine, which is also LP based like you
describe in your doc. </div>
<div style="font-family: Calibri, sans-serif; font-size: 14px;">I know in your initial meeting, you plan to go over your proposal of building a VM placement engine that subscribes to the Congress DSE, I probably will understand the Congress workflows better
and see how I could incorporate this proposal to talk to the Solver Scheduler to make the placement decisions. </div>
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<div style="font-family: Calibri, sans-serif; font-size: 14px;"><span style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">The example you provide in the doc, is a very good
scenario, where a VM placement engine should continuously monitor and trigger VM migrations. </span><br style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">
<br style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">
<span style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">I am also interested in the case of a policy-driven scheduling for the initial creation of VMs. This is where say people
will call Nova APIs and create a new set of VMs. Here the scheduler workflow should address the constraints as imposed from the user's policies. </span><br style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">
<br style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">
<span style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">Say the simple policy is " Host's free RAM >= 0.25 * Memory_Capacity"</span><br style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">
<span style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">I would like the scheduler to use this policy as defined from Congress, and apply it during the scheduling as part
of the Nova boot call. </span><br style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">
<br style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">
<span style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">I am really interested in and need help in coming up with a solution integrating Solver Scheduler, so say if I have
an implementation of a "MemoryCapacityConstraint", which takes a hint value "free_memory_limit" (0.25 in this example), </span><br style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">
<span style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">could we have a policy in Datalog </span><br style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">
<br style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">
<span style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">placement_requirement(id) :-</span><br style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">
<span style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">nova:host(id), </span><br style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">
<span style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">solver_scheduler:applicable_constraints(id, ["MemoryCapacityConstraint", ]), </span><br style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">
<span style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">applicable_metadata(id, {"free_memory_limit": 0.25, })</span><br style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">
<br style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">
<span style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">This policy could be set and delegated by Congress to solver scheduler via the "set_policy" API. or the Solver Scheduler
can query Congress via a "get_policy" API to get this policy, and incorporate it as part of the solver scheduler workflow ?</span><br style="color: rgb(51, 51, 51); font-family: Arial, sans-serif, sans; font-size: 13px; widows: 1; background-color: rgb(255, 255, 255);">
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<div><font face="Arial"><span style="font-size: 13px;">Does this sound doable ?</span></font></div>
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<div><font face="Arial"><span style="font-size: 13px;">Thanks,</span></font></div>
<div><font face="Arial"><span style="font-size: 13px;">Yathi. </span></font></div>
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<div>On 3/16/15, 11:05 AM, "Tim Hinrichs" <<a href="mailto:thinrichs@vmware.com">thinrichs@vmware.com</a>> wrote:</div>
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Hi all,
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<div class="">The feedback on the POC delegation proposal has been mostly positive. Several people have asked for a meeting to discuss further. Given time zone constraints, it will likely be 8a or 9a Pacific. Let me know in the next 2 days if you want to
participate, and we will try to find a day that everyone can attend.</div>
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<div class=""><a href="https://docs.google.com/document/d/1ksDilJYXV-5AXWON8PLMedDKr9NpS8VbT0jIy_MIEtI/edit" class="">https://docs.google.com/document/d/1ksDilJYXV-5AXWON8PLMedDKr9NpS8VbT0jIy_MIEtI/edit</a></div>
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<div class="">Thanks!</div>
<div class="">Tim</div>
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