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OpenStack Compute (Nova)
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Chris Dent 66a47b7623 [placement] Retry allocation writes server side 
This change adds a fast retry loop around
AllocationList._set_allocations if a resource provider generation
conflict happens. It turns out that under high concurrency of allocation
claims being made on the same resource provider conflicts can be quite
common and client side retries are insufficient.

Because both consumer generation and resource provider generations had
raised the same exception there was no way to distinguish between the
two so a child of ConcurrentUpdateDetected has been created as
ResourceProviderConcurrentUpdateDetected. In the future this will allow
us to send different error codes to the client as well, but that change
is not done here.

When the conflict is detected, all the resource providers in the
AllocationList are reloaded and the list objects refreshed.

Logging is provided to indicate:

* at debug that a retry is going to happen
* at warning that all the retries failed and the client is going to
  see the conflict

The tests for this are a bit funky: Some mocks are used to cause the
conflicts, then the real actions after a couple of iterations.

This was backported from 72e4c4c8d7 with
conflicts because exceptions, tests and object files were moved to
new locations with Rocky and the AllocationList.create_all method was
renamed to the more accurate replace_all. Prior to Rocky there were
no Consumer objects and fewer helper methods in functional tests,
so the test is adjusted accordingly.

Change-Id: Id614d609fc8f3ed2d2ff29a2b52143f53b3b1b9a
Closes-Bug: #1719933
(cherry picked from commit 72e4c4c8d7)
 		2018-08-03 14:41:15 +01:00
api-guide/source Merge "Update links in documents" 2018-02-08 01:29:29 +00:00
api-ref/source Add policy rule to block image-backed servers with 0 root disk flavor 2018-06-18 13:51:41 -04:00
contrib trivial: Remove "vif" script 2017-08-07 16:00:10 +01:00
devstack Blacklist test_extend_attached_volume from cells v1 job 2017-10-05 17:31:05 -04:00
doc Merge "Update admin/flavors document" into stable/queens 2018-07-08 02:05:41 +00:00
etc/nova Move remaining uses of parted to privsep. 2018-01-24 22:26:36 +00:00
gate move gate hooks to gate/ 2017-01-04 11:05:16 +00:00
nova [placement] Retry allocation writes server side 2018-08-03 14:41:15 +01:00
placement-api-ref/source Handle CannotDeleteParentResourceProvider to 409 Conflict 2018-06-28 13:50:18 +00:00
playbooks/legacy Migrate tempest-dsvm-multinode-live-migration job in-tree 2018-05-10 14:51:01 +00:00
releasenotes Merge "add mtu to libvirt xml for ethernet and bridge types" into stable/queens 2018-07-08 04:24:54 +00:00
tools Finish stestr migration 2017-11-24 16:51:12 -05:00
.coveragerc Remove nova/openstack/* from .coveragerc 2016-10-12 16:20:49 -04:00
.gitignore Fix test runner config issues with os-testr 1.0.0 2017-09-13 17:11:57 -04:00
.gitreview Update .gitreview for stable/queens 2018-02-09 07:15:06 +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 Use ironic-tempest-dsvm-ipa-wholedisk-bios-agent_ipmitool-tinyipa in tree 2018-07-03 13:01:28 +00:00
CONTRIBUTING.rst Update links in documents 2018-01-12 17:05:11 +08:00
HACKING.rst doc: fix link to creating unit tests in contributor guide 2017-11-14 11:22:43 -05:00
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 doc: Rework README to reflect new doc URLs 2017-08-03 16:06:08 -04:00
babel.cfg Get rid of distutils.extra. 2012-02-08 19:30:39 -08:00
bindep.txt Bindep does not catch missing libpcre3-dev on Ubuntu 2018-02-13 16:53:16 -05:00
requirements.txt Updated from global requirements 2018-02-01 07:20:35 +00:00
setup.cfg Deprecate the IronicHostManager 2017-11-28 15:23:48 -05:00
setup.py Updated from global requirements 2017-03-02 11:50:48 +00:00
test-requirements.txt Updated from global requirements 2018-01-29 00:21:52 +00:00
tests-py3.txt Skip unit tests for SSL + py3 2017-03-02 14:30:16 +08:00
tox.ini Update UPPER_CONSTRAINTS_FILE for stable/queens 2018-02-09 07:15:13 +00:00

README.rst

Team and repository tags

image

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: