melanie witt 68f80d2013 Use subqueryload() instead of joinedload() for (system_)metadata ... Currently, when we "get" a single instance from the database and we load metadata and system_metadata, we do so using a joinedload() which does JOINs with the respective tables. Because of the one-to-many relationship between an instance and (system_)metadata records, doing the database query this way can result in a large number of additional rows being returned unnecessarily and cause a large data transfer. This is similar to the problem addressed by change I0610fb16ccce2ee95c318589c8abcc30613a3fe9 which added separate queries for (system_)metadata when we "get" multiple instances. We don't, however, reuse the same code for this change because _instances_fill_metadata converts the instance database object to a dict, and some callers of _instance_get_by_uuid need to be able to access an instance database object attached to the session (example: instance_update_and_get_original). By using subqueryload() [1], we can perform the additional queries for (system_)metadata to solve the problem with a similar approach. Closes-Bug: #1799298 [1] https://docs.sqlalchemy.org/en/13/orm/loading_relationships.html#subquery-eager-loading Change-Id: I5c071f70f669966e9807b38e99077c1cae5b4606 (cherry picked from commit e728fe668a) (cherry picked from commit 63d2e62c3a) (cherry picked from commit e7a45e0335) (cherry picked from commit 4350074029) (cherry picked from commit ad7e4fb8f4)		2021-03-29 15:07:52 +00:00
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api_migrations	Merge "Add queued for delete to instance_mappings table."	2018-07-11 21:32:30 +00:00
migrate_repo	Add trusted_certs to instance_extra	2018-03-29 23:00:42 -04:00
__init__.py	Remove SQLite BigInteger/Integer translation logic	2015-12-07 12:49:22 -05:00
api.py	Use subqueryload() instead of joinedload() for (system_)metadata	2021-03-29 15:07:52 +00:00
api_models.py	Online data migration for queued_for_delete flag	2018-07-23 14:48:18 -07:00
migration.py	Isolate placement database config	2018-06-19 13:22:04 +01:00
models.py	Add trusted_certs to instance_extra	2018-03-29 23:00:42 -04:00
types.py	Use is_valid_cidr and is_valid_ipv6_cidr from oslo_utils	2017-01-31 11:45:00 +00:00
utils.py	Remove translation of log messages	2017-07-18 09:03:39 +00:00