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[placement][ptg] Allocation Partitioning


On Tue, 16 Apr 2019 10:33:45 -0700, Dan Smith <dms at danplanet.com> wrote:
>> 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.

+1 to all of this.

-melanie