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OpenStack Compute (Nova)
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melanie witt e7a45e0335 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)
 		2021-01-27 19:37:17 +00:00
api-guide/source Add release notes for Cyborg-Nova integration. 2020-04-03 17:13:04 +08:00
api-ref/source compute: Validate a BDMs disk_bus when provided 2020-08-03 21:31:25 +01:00
devstack Merge "Find instance in another cell during floating IP re-association" 2019-09-13 15:19:55 +00:00
doc Merge "docs: fix aggregate weight multiplier property names" into stable/ussuri 2020-10-06 02:15:00 +00:00
etc/nova Allow versioned discovery unauthenticated 2020-04-03 21:24:28 +00:00
gate test_evacuate.sh: Stop using libvirt-bin 2020-09-22 11:44:42 +01:00
nova Use subqueryload() instead of joinedload() for (system_)metadata 2021-01-27 19:37:17 +00:00
playbooks Enable cross-cell resize in the nova-multi-cell job 2019-12-23 10:10:57 -05:00
releasenotes Merge "Allow tap interface with multiqueue" into stable/ussuri 2020-10-10 10:56:23 +00:00
roles Enable cross-cell resize in the nova-multi-cell job 2019-12-23 10:10:57 -05:00
tools Follow up for cherry-pick check for merge patch 2020-10-15 16:30:31 +00:00
.coveragerc Remove nova/openstack/* from .coveragerc 2016-10-12 16:20:49 -04:00
.gitignore Delete the placement code 2019-04-28 20:06:15 +00:00
.gitreview Update .gitreview for stable/ussuri 2020-04-23 21:37:31 +00:00
.mailmap Add mailmap entry 2014-05-07 12:14:26 -07:00
.pre-commit-config.yaml Switch to hacking 2.x 2020-01-17 11:30:40 +00:00
.stestr.conf Finish stestr migration 2017-11-24 16:51:12 -05:00
.zuul.yaml zuul: remove legacy-tempest-dsvm-neutron-dvr-multinode-full 2020-07-17 09:44:08 +02:00
CONTRIBUTING.rst [Community goal] Update contributor documentation 2020-03-25 12:01:37 +00:00
HACKING.rst Merge "Make it easier to run a selection of tests relevant to ongoing work" 2019-11-22 20:58:18 +00:00
LICENSE initial commit 2010-05-27 23:05:26 -07:00
MAINTAINERS Fix broken URLs 2017-09-07 15:42:31 +02:00
README.rst Start README.rst with a better title 2019-11-19 17:29:28 +01:00
babel.cfg Get rid of distutils.extra. 2012-02-08 19:30:39 -08:00
bindep.txt Added openssh-client into bindep 2019-10-23 07:21:23 +00:00
lower-constraints.txt Merge "Use oslo policy flag to disable default change warning instead of all" 2020-04-21 10:04:19 +00:00
requirements.txt Merge "Use oslo policy flag to disable default change warning instead of all" 2020-04-21 10:04:19 +00:00
setup.cfg api: Add support for new cyborg extra specs 2020-04-08 13:19:39 +00:00
setup.py Updated from global requirements 2017-03-02 11:50:48 +00:00
test-requirements.txt Bump hacking min version to 3.0.1 2020-05-18 09:48:56 +00:00
tox.ini Check cherry-pick hashes in pep8 tox target 2020-06-16 06:47:20 -07:00

README.rst

OpenStack Nova

image

OpenStack Nova provides a cloud computing fabric controller, supporting a wide variety of compute technologies, including: libvirt (KVM, Xen, LXC and more), Hyper-V, VMware, XenServer, OpenStack Ironic and PowerVM.

Use the following resources to learn more.

API

To learn how to use Nova's API, consult the documentation available online at:

For more information on OpenStack APIs, SDKs and CLIs in general, refer to:

Operators

To learn how to deploy and configure OpenStack Nova, consult the documentation available online at:

In the unfortunate event that bugs are discovered, they should be reported to the appropriate bug tracker. If you obtained the software from a 3rd party operating system vendor, it is often wise to use their own bug tracker for reporting problems. In all other cases use the master OpenStack bug tracker, available at:

Developers

For information on how to contribute to Nova, please see the contents of the CONTRIBUTING.rst.

Any new code must follow the development guidelines detailed in the HACKING.rst file, and pass all unit tests.

Further developer focused documentation is available at:

Other Information

During each Summit and Project Team Gathering, we agree on what the whole community wants to focus on for the upcoming release. The plans for nova can be found at: