OpenStack Networking (Neutron)
05fcfef6ce
During a mailing list discussion on some OOM issues neutron has been seeing [0], Mike Bayer recommended we should change from using subquery to selectin DB load strategy. A full description of this strategy can be found here [1], but in short: - “subquery” loading incurs additional performance / complexity issues when used on a many-levels-deep eager load, as subqueries will be nested repeatedly. - "The subqueryload() eager loader is mostly legacy at this point, superseded by selectinload() - "The only scenario in which selectin eager loading is not feasible is when the model is using composite primary keys, and the backend database does not support tuples with IN, which currently includes SQL Server." So that does not apply to us. The plan agreed to at the neutron drivers meeting [2] was to make this change early in the cycle so we would be able to see if there were any issues through the D cycle. Added hacking checks so new code using subquery loads is not added back. [0] https://lists.openstack.org/archives/list/openstack-discuss@lists.openstack.org/thread/EHLQQXNG3NLLZYPDGG2ES3DINIJ7YT3N/ [1] https://docs.sqlalchemy.org/en/20/orm/queryguide/relationships.html#selectin-eager-loading [2] https://meetings.opendev.org/meetings/neutron_drivers/2024/neutron_drivers.2024-05-31-14.00.log.html#l-67 Closes-bug: #2067770 Depends-on: https://review.opendev.org/c/openstack/neutron-lib/+/920936 Change-Id: I6e40a15284da392a3d48d45205a7a5770c14c297 |
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| devstack | ||
| doc | ||
| etc | ||
| neutron | ||
| playbooks | ||
| rally-jobs | ||
| releasenotes | ||
| roles | ||
| tools | ||
| vagrant/ovn | ||
| zuul.d | ||
| .coveragerc | ||
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| .gitreview | ||
| .mailmap | ||
| .pre-commit-config.yaml | ||
| .pylintrc | ||
| .stestr.conf | ||
| bindep.txt | ||
| CONTRIBUTING.rst | ||
| HACKING.rst | ||
| LICENSE | ||
| plugin.spec | ||
| README.rst | ||
| requirements.txt | ||
| setup.cfg | ||
| setup.py | ||
| test-requirements.txt | ||
| TESTING.rst | ||
| tox.ini | ||
OpenStack Neutron
Neutron is an OpenStack project to provide "network connectivity as a service" between interface devices (e.g., vNICs) managed by other OpenStack services (e.g., Nova).
To learn more about neutron:
- Documentation: https://docs.openstack.org/neutron/latest/
- Features: https://specs.openstack.org/openstack/neutron-specs
- Defects: https://launchpad.net/neutron
- Release notes: https://docs.openstack.org/releasenotes/neutron/index.html
- Source: https://opendev.org/openstack/neutron
If you would like to contribute to Neutron, please read the file CONTRIBUTING.rst or see the Neutron contributor guide:
https://docs.openstack.org/neutron/latest/contributor/contributing.html
Get in touch via email. Use [Neutron] in your subject.