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On 11/17/2017 01:09 AM, Ramu, MohanX wrote:
> Thank you Jay.
> 
> I am trying to understand usage of custom traits is that
> 
> I have a custom trait called "CUSTOM_ABC" which is associated with Resource Provider "Resource provider-1" , So I can launch the instance which is having flavor/image associated with same custom traits (CUSTOM_ABC) only on the Resource Provider "Resource provider-1" .

As mentioned in my response below, we're currently working on adding 
this functionality to Nova for the Queens release. The work is in this 
patch series:

https://review.openstack.org/#/q/status:open+project:openstack/nova+branch:master+topic:validate_provider_summaries

You will need to wait for the Queens release for the complete 
traits-based scheduling functionality to be operational.

Best,
-jay

> -----Original Message-----
> From: Jay Pipes [mailto:jaypipes at gmail.com]
> Sent: Thursday, November 16, 2017 9:10 PM
> To: Ramu, MohanX <mohanx.ramu at intel.com>
> Cc: openstack at lists.openstack.org
> Subject: Re: Traits for filter
> 
> On 11/16/2017 12:06 AM, Ramu, MohanX wrote:
>> Hi All,
>>
>> I have a use case that I  need to apply some filter (Custom traits)
>> while Placement API fetch the resource providers for launching instance.
>>
>> So that I can have list of resource provided which meets my
>> condition/filter/validation. The validation is nothing but trust about
>> the Host(compute node) where I am going to launch the instances.
>>
>> The below link says that it is possible, don't have idea how to
>> implement/test this scenario.
>>
>> https://specs.openstack.org/openstack/nova-specs/specs/ocata/implement
>> ed/resource-providers-scheduler-db-filters.html
>>
>> we would rather make a HTTP call to the placement API on a specific
>> REST resource with a request that would return the list of resource
>> providers' UUIDs that would match requested resources and traits
>> criterias based on the original RequestSpec object.
> 
> Unfortunately, you're going to need to wait for this to be possible with the placement API. We're making progress here, but it's not complete yet.
> 
> You won't be using a custom filter (or any filter at all in the nova-scheduler). Rather, you'll simply have the required trait in the image or flavor and nova-scheduler will ask placement API for all providers that have the required traits and requested resource amounts.
> 
> We're probably 3-4 weeks away from having this code merged.
> 
> Best,
> -jay
>