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• These categories could be any of the following: disaster_zone, region, complex, time_zone, and maintenance_zone. Really, we are talking affinity/anti-affinity at the level of DCs, but these terms may cause confusion with affinity/anti-affinity in OpenStack.

HPA & Cloud Agnostic Intent

Constrain each demand's inventory candidates based on available Hardware platform capabilities (HPA) and also intent support. Note that currently HPA and the cloud agnostic contraints will use the same schema.

Requirements mapped to the inventory provider specified properties, referenced by the demands. For example, properties could be hardware capabilities provided by the platform through flavors or cloud-region eg:(CPU-Pinning, NUMA), features supported by the services, etc.

Schema

| Property | Description | |----------------|-----------------------------------| | evaluate| List of id, type, directives and flavorProperties of each VM of the VNF demand. | 

constraints:
  hpa_constraint:
    type: hpa
    demands: [my_vnf_demand, my_other_vnf_demand]
    properties:
      evaluate:
        - [ List of {id: {vdu Name},
                     type: {type of VF}
                     directives: {DIRECTIVES LIST}, 
                     flavorProperties: HPACapability DICT} ]

HPACapability DICT :
  hpa-feature: basicCapabilities
  hpa-version: v1
  architecture: generic
  directives:
    - DIRECTIVES LIST
  hpa-feature-attributes:
    - HPAFEATUREATTRIBUTES LIST

DIRECTIVES LIST
  type: String
  attributes:
    - ATTRIBUTES LIST

ATTRIBUTES LIST
  attribute_name: String
  attribute_value: String

HPAFEATUREATTRIBUTES LIST
  hpa-attribute-key: String
  hpa-attribute-value: String
  operator: One of OPERATOR
  unit: String

OPERATOR : ['=', '<', '>', '<=', '>=', 'ALL']

VIM Fit

Constrain each demand's inventory candidates based on capacity check for available capacity of a list of VIMs

Requirements are sent as a request to a vim controller. vim controllers are defined by plugins in Homing (e.g., multicloud).

A vimcontroller plugin knows how to communicate with a particular endpoint (via HTTP/REST, DMaaP, etc.), obtain necessary information, and make a decision. The endpoint and credentials can be configured through plugin settings.

Schema

| Property | Description | |----------------|-----------------------------------| | controller | Name of a vim controller. | | request | Opaque dictionary of key/value pairs. Values must be strings or numbers. Encoded and sent to the vim controller via a plugin. |

constraints:
  check_cloud_capacity:
    type: vim_fit
    demands: [my_vnf_demand, my_other_vnf_demand]
    properties:
      controller: multicloud
      request: REQUEST_DICT

Inventory Group

Constrain demands such that inventory items are grouped across two demands.

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