[openstack-dev] [nova][scheduler]The database access in the scheduler filters

John Garbutt john at johngarbutt.com
Fri Nov 1 10:16:43 UTC 2013

Its intentional. Cells is there to split up your nodes into more
manageable chunks.

There are quite a few design summit sessions on looking into
alternative approaches to our current scheduler.

While I would love a single scheduler to make everyone happy, I am
thinking we might end up with several scheduler, each with slightly
different properties, and you pick one depending on what you want to
do with your cloud.


On 31 October 2013 22:39, Jiang, Yunhong <yunhong.jiang at intel.com> wrote:
> I noticed several filters (AggregateMultiTenancyIsoaltion, ram_filter, type_filter, AggregateInstanceExtraSpecsFilter) have DB access in the host_passes(). Some will even access for each invocation.
> Just curios if this is considered a performance issue? With a 10k nodes, 60 VM per node, and 3 hours VM life cycle cloud, it will have more than 1 million DB access per second. Not a small number IMHO.
> Thanks
> --jyh
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