[openstack-dev] [Nova] FFE Request: Solver Scheduler: Complex constraint based resource placement

Sean Dague sean at dague.net
Wed Mar 5 22:12:03 UTC 2014

On 03/05/2014 03:40 PM, Yathiraj Udupi (yudupi) wrote:
> Hi, 
> We would like to make a request for FFE for the Solver Scheduler work.
>  A lot of work has gone into it since Sep’13, and the first patch has
> gone through several iteration after some reviews.   The first patch
> - https://review.openstack.org/#/c/46588/ introduces the main solver
> scheduler driver, and a reference solver implementation, and the
> subsequent patches that are already added provide the pluggable solver,
> and individual support for adding constraints, costs, etc. 
> First Patch: https://review.openstack.org/#/c/46588/ 
> Second patch with enhanced support for pluggable constraints and costs:
> -  https://review.openstack.org/#/c/70654/
> <https://review.openstack.org/#/c/70654/>
> Subsequent patches add the constraints and the costs. 
> BP: https://blueprints.launchpad.net/nova/+spec/solver-scheduler 
> Core sponsor:  Joe Gordon
> John Garbutt expressed concerns in Blueprint whiteboard regarding the
> configuration values, existing filters,etc and I noticed that you have
> un-approved this BP. 
> John, I will discuss with you in detail over IRC. 
> But briefly,  the plan is not many new configuration values will be
> added, just the ones to specify the solver to use, and the pluggable
> constraints, and costs to use, with the weights for the costs. (these
> are mainly part of the second patch -
>  https://review.openstack.org/#/c/70654/
> <https://review.openstack.org/#/c/70654/> )
> The plan is to gradually support the concepts for the existing filters
> as the constraints that are accepted by our Solver Scheduler.  
> Depending on the constraints and the costs chosen, the final scheduling
> will be done by solving the problem as an optimization problem. 
> Please reconsider this blueprint, and allow a FFE. 
> Thanks,
> Yathi. 
> _______________________________________________
> OpenStack-dev mailing list
> OpenStack-dev at lists.openstack.org
> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev

This does not seem small or low risk in any way. And the blueprint is
not currently approved.

Also, as far as I can tell you never actually talked with Joe Gordon
about him supporting the FFE.


This needs to wait for Juno.


Sean Dague
Samsung Research America
sean at dague.net / sean.dague at samsung.com

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