Optimize driver loading in v2 API¶
https://storyboard.openstack.org/#!/story/2006654
Problem Description¶
Currently, required drivers are loaded in the __init__ method of v2 API
resources. However, flask_restful instanciates resources on
each request, meaning that drivers are also loaded on each request. This
leads to sub-optimal performance.
Proposed Change¶
Implement two new classmethods in cloudkitty.api.v2.base.BaseResource:
reload: Reloads all required drivers.load: Loads all required drivers by callingreload. In case the drivers are already loaded, does nothing
In order to be able to persist drivers between class instantiations, they will be set as class attributes.
Alternatives¶
None.
Data model impact¶
None.
REST API impact¶
None.
Security impact¶
None.
Notifications Impact¶
None.
Other end user impact¶
The average response time for v2 API endpoints will be reduced.
Performance Impact¶
Loading the drivers only once will result in a performance gain.
Other deployer impact¶
Log messages that appear on driver instantiation will appear only once rather than on each request.
Developer impact¶
Driver loading will have to be done in the reload method rather than in
__init__.
Implementation¶
Assignee(s)¶
- Primary assignee:
<lukapeschke/peschk_l>
Work Items¶
Implement the
reloadandloadmethods.
Dependencies¶
None.
Testing¶
Existing unit tests for the v2 API along with planned tempest tests will test this.
Documentation Impact¶
The developer documentation for the v2 API will be updated to include
information about the load and reload methods
References¶
None.
