Hi Tim,

Thanks for your updated doc on Delegation from Congress to a domain-specific 
policy engine, in this case, you are planning to build a LP-based VM-Placement 
engine to be the domain specific policy engine.
I agree your main goal is to first get the delegation interface sorted out.  It 
will be good so that external services (like Solver-Scheduler) can also easily 
integrate to the delegation model.

>From the Solver-Scheduler point of view,  we would actually want to start 
>working on a PoC effort to start integrating Congress and the Solver-Scheduler.
We believe rather than pushing this effort to a long-term,  it would add value 
to both the Solver Scheduler effort, as well as the Congress effort to try some 
early integration now, as most of the LP solver work for VM placements is ready 
available now in Solver scheduler, and we need to spend some time thinking 
about translating your domain-agnostic policy to constraints that the Solver 
scheduler can use.

I would definitely need your help from the Congress interfaces and I hope you 
will share your early interfaces for the delegation, so I can start the effort 
from the Solver scheduler side for integration.
I will reach out to you to get some initial help for integration w.r.t. 
Congress, and also keep you posted about the progress from our side.


On 2/23/15, 11:28 AM, "Tim Hinrichs" 
<thinri...@vmware.com<mailto:thinri...@vmware.com>> wrote:

Hi all,

I made a heavy editing pass of the Delegation google doc, incorporating many of 
your comments and my latest investigations into VM-placement.  I left the old 
stuff in place at the end of the doc and put the new stuff at the top.

My goal was to propose an end-to-end workflow for a PoC that we could put 
together quickly to help us explore the delegation interface.  We should 
iterate on this design until we have something that we think is workable.   And 
by all means pipe up if you think we need a totally different starting point to 
begin the iteration.

(BTW I'm thinking of the integration with solver-scheduler as a long-term 
solution to VM-placement, once we get the delegation interface sorted out.)


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