Support Placement API¶
https://blueprints.launchpad.net/watcher/+spec/support-placement-api
Problem description¶
Placement provides a service for managing, selecting, and claiming available resources in a cloud. It was introduced in the Newton release within the nova repository and extracted to the placement repository in the Stein release. Now Watcher gets data directly from Nova for building data model and strategies processing. But some data, such as overcommit allocation ratio for VCPU and Ram, can’t get from Nova. The knowledge available to strategies to make informed decisions is currently limited due to the placement api being unavailable.
Use Cases¶
As a Watcher developer, I want to get data from Placement.
Proposed change¶
In this spec we just add Placement helper to Watcher. We plan to improve the data model and strategies in the future specs. The functions in the helper as below:
List resource providers
List resource classes
List resource provider inventories
List resource provider traits
List resource provider allocations
List resource provider usages
List allocation candidates
Alternatives¶
None
Data model impact¶
None
REST API impact¶
None
Security impact¶
None
Notifications impact¶
None
Other end user impact¶
None
Performance Impact¶
None
Other deployer impact¶
Add a new config section [placement_client].
Some config options:
api_version: The minimum version restricted to a given Major API.
interface: The default interface for URL discovery.
region_name: The default region_name for URL discovery.
Developer impact¶
None
Implementation¶
Assignee(s)¶
- Primary assignee:
licanwei
Work Items¶
Add Placement helper
Add unit test
Dependencies¶
None
Testing¶
Unittest for Placement helper
Documentation Impact¶
None
References¶
History¶
Release Name |
Description |
|---|---|
Train |
Introduced |
