OpenStack Compute (Nova)
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Matt Riedemann 74e66fe8d4 Avoid unnecessary joins in InstanceGroup.get_hosts
The InstanceList.get_by_filters query is joining on
info_cache, security_groups, metadata and system_metadata
because of how instance_get_all_by_filters_sort in the DB API
works if columns_to_join (expected_attrs) is None. The get_hosts
method only cares about the instance.host value of its members
so those joins are unnecessarily expensive.

This change simply passes expected_attrs=[] to get_by_filters
to avoid the joins. A follow up change can further optimize this
code by adding a new query method to just get the host values
for a list of instance uuids, so a TODO is left in place for that.
Note that a new query method would need to be remotable and thus
not something we can backport.

Change-Id: I53d4b38d12404a1641f667c537404effa837a83d
Partial-Bug: #1830234
(cherry picked from commit 15ccf2ddfb)
2019-06-10 15:15:23 +00:00
api-guide/source Documentation for bandwidth support 2019-03-18 11:24:56 +01:00
api-ref/source Block swap volume on volumes with >1 rw attachment 2019-05-30 20:59:55 +00:00
devstack Remove the CachingScheduler 2018-10-18 17:55:36 -04:00
doc docs: Don't version links to reno docs 2019-05-29 16:52:37 +01:00
etc/nova Add oslo.privsep to config-generator list 2019-03-01 16:43:21 +00:00
gate update gate test for removal of force evacuate 2019-03-08 16:31:31 +00:00
nova Avoid unnecessary joins in InstanceGroup.get_hosts 2019-06-10 15:15:23 +00:00
playbooks/legacy OpenDev Migration Patch 2019-04-19 19:47:27 +00:00
releasenotes Merge "Fixes multi-registry config in Quobyte driver" into stable/stein 2019-06-01 03:49:42 +00:00
tools Make Xen code py3-compatible 2018-08-10 20:04:19 +00:00
.coveragerc Remove nova/openstack/* from .coveragerc 2016-10-12 16:20:49 -04:00
.gitignore Remove Placement API reference 2018-11-28 03:38:41 +00:00
.gitreview OpenDev Migration Patch 2019-04-19 19:47:27 +00:00
.mailmap Add mailmap entry 2014-05-07 12:14:26 -07:00
.stestr.conf Finish stestr migration 2017-11-24 16:51:12 -05:00
.zuul.yaml OpenDev Migration Patch 2019-04-19 19:47:27 +00:00
CONTRIBUTING.rst Update links in documents 2018-01-12 17:05:11 +08:00
HACKING.rst Document how to make tests log at DEBUG level 2019-02-13 20:46:01 +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 Docs: modernise links 2018-03-24 20:27:11 +08:00
babel.cfg Get rid of distutils.extra. 2012-02-08 19:30:39 -08:00
bindep.txt Merge "Bindep does not catch missing libpcre3-dev on Ubuntu" 2018-02-14 07:31:09 +00:00
lower-constraints.txt Merge "Require python-ironicclient>=2.7.0" 2019-03-22 02:55:13 +00:00
requirements.txt Merge "Convert driver supported capabilities to compute node provider traits" 2019-03-05 09:50:12 +00:00
setup.cfg Update mailinglist from dev to discuss 2018-12-05 09:44:35 +08:00
setup.py Updated from global requirements 2017-03-02 11:50:48 +00:00
test-requirements.txt Require python-ironicclient>=2.7.0 2019-03-12 15:10:11 -04:00
tox.ini Update UPPER_CONSTRAINTS_FILE for stable/stein 2019-03-22 03:50:05 +00:00

README.rst

Team and repository tags

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OpenStack Nova

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: