Hi Tim,
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.
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.
The example you provide in the doc, is a very good scenario, where a VM
placement engine should continuously monitor and trigger VM migrations.
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.
Say the simple policy is " Host's free RAM >= 0.25 * Memory_Capacity"
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.
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),
could we have a policy in Datalog
placement_requirement(id) :-
nova:host(id),
solver_scheduler:applicable_constraints(id, ["MemoryCapacityConstraint", ]),
applicable_metadata(id, {"free_memory_limit": 0.25, })
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 ?
Does this sound doable ?
Thanks,
Yathi.
On 3/16/15, 11:05 AM, "Tim Hinrichs"
<thinri...@vmware.com<mailto:thinri...@vmware.com>> wrote:
Hi all,
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.
https://docs.google.com/document/d/1ksDilJYXV-5AXWON8PLMedDKr9NpS8VbT0jIy_MIEtI/edit
Thanks!
Tim
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