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[placement][ptg] Allocation Partitioning


> When you think of "consumer type" do you imagine it as an enumeration
> with members similar to "instance", "instance-migration",
> "reservation" where those types are the same in all placement
> deployments, including those which are being used by multiple clouds
> (or multiple novas).

I guess it seems more like it needs to be (loosely) an enum within a
given shard. Like "I'm nova, my shard is $UUID and within that shard, my
consumer types are instance, migration, etc". Might also be "I'm ironic,
my shard is $UUID and within that shard, my consumer types are
nova-instance, standalone-use, etc".

I don't really want to codify the enum in placement, as I think it's
just a key that the consuming service uses to correlate the "reason" for
each allocation. Some (like nova) could be a static small enum, but for
others it could need to be dynamic and scale per tenant or something
like that.

> What I'm trying to make sure about is: Is this a concept that is
> fully distinct from resource provider partitioning/shards/whatever
> the right word is, solely associated a consumer and the allocations
> it has right now? If not, how so?

I'd like it to be fully distinct. If it's not, then nova basically needs
to define consumers as "instance-$nova_distinct_deployment_uuid" instead
of "instance", effectively using the consumer type as both a consumer
type and a shard key.

--Dan