OpenStack Compute (Nova)
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Matt Riedemann 6369f39244 Remove allocations before setting vm_status to SHELVED_OFFLOADED
Tempest is intermittently failing a test which does the
following:

1. Create a server.
2. Shelve offload it.
3. Unshelve it.

Tempest waits for the server status to be SHELVED_OFFLOADED
before unshelving the server, which goes through the
scheduler to pick a compute node and claim resources on it.

When shelve offloading a server, the resource allocations
for the instance and compute node it was on are cleared, which
will also delete the internal consumer record in the placement
service.

The race is that the allocations are removed during shelve
offload *after* the server status changes to SHELVED_OFFLOADED.
This leaves a window where unshelve is going through the
scheduler and gets the existing allocations for the instance,
which are non-empty and have a consumer generation. The
claim_resources method in the scheduler then uses that
consumer generation when PUTing the allocations. That PUT
fails because in between the GET and PUT of the allocations,
placement has deleted the internal consumer record. When
PUTing the new allocations with a non-null consumer generation,
placement returns a 409 conflict error because for a new
consumer it expects the "consumer_generation" parameter to be
None.

This change handles the race by simply making sure the allocations
are deleted (along with the related consumer record in placement)
*before* the instance.vm_status is changed.

Change-Id: I2a6ccaff904c1f0759d55feeeef0ec1da32c65df
Closes-Bug: #1798688
2018-12-07 17:27:16 -05:00
api-guide/source Fix server query examples 2018-11-19 23:22:39 +00:00
api-ref/source Merge "api-ref: Add a description about sort order" 2018-11-12 06:50:27 +00:00
devstack Remove the CachingScheduler 2018-10-18 17:55:36 -04:00
doc Merge "Clean up cpu_shared_set config docs" 2018-12-06 11:28:53 +00:00
etc/nova Add osprofiler config options to generated reference 2018-06-16 12:46:19 +00:00
gate Use tempest [compute]/build_timeout in evacuate tests 2018-12-05 10:46:06 -05:00
nova Remove allocations before setting vm_status to SHELVED_OFFLOADED 2018-12-07 17:27:16 -05:00
placement-api-ref Merge "Document no content on POST /reshaper 204" 2018-08-29 09:22:16 +00:00
playbooks/legacy Add post-test hook for testing evacuate 2018-10-25 16:15:56 -04:00
releasenotes Merge "Change the default values of XXX_allocation_ratio" 2018-12-06 23:44:42 +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 Implement granular policy rules for placement 2018-05-17 11:12:16 -04:00
.gitreview Add .gitreview config file for gerrit. 2011-10-24 15:07:19 -04:00
.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 Add post-test hook for testing evacuate 2018-10-25 16:15:56 -04:00
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
CONTRIBUTING.rst Update links in documents 2018-01-12 17:05:11 +08:00
HACKING.rst Add a hacking rule for deprecated assertion methods 2018-10-25 11:49:10 +09:00
LICENSE initial commit 2010-05-27 23:05:26 -07:00
lower-constraints.txt Use SleepFixture instead of mocking _ThreadingEvent.wait 2018-11-08 16:50:39 -05:00
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
requirements.txt Use SleepFixture instead of mocking _ThreadingEvent.wait 2018-11-08 16:50:39 -05:00
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 Fix ironic client ironic_url deprecation warning 2018-10-24 17:59:10 +02:00
tox.ini tox: Stop build *all* docs in 'docs' 2018-10-26 18:00:53 +01:00

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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: