Dan Smith 5d86aa7edb Fix interpretation of max_attempts for scheduling alternates
Since max_attempts is not max_retries, we should look for max_attempts-1
alternate hosts. This change makes the num_alts variable actually reflect
the number of alternates we are looking for, and doesn't actually change
the logic at all. This also adds functional tests to verify max_attempts
behavior with 1 (no retries) and 2 (one retry), just to make sure it is
doing what we expect.

Further, we optimize _get_alternate_hosts() to only re-filter/weigh the
host list if we're looking for alternates for multiple instances. Now
that it's clear that num_alts is only nonzero if we are going to look
at the host list again to find those alternates, it can be more clearly
(and accurately) used to optimize out that extra step if we are not
getting alternates.

Change-Id: I16ba29385dd2db5467829e6c17fc395096b5cfd3
2018-05-18 09:06:07 -07:00
2017-08-07 16:00:10 +01:00
2017-11-24 16:51:12 -05:00
2014-05-07 12:14:26 -07:00
2017-11-24 16:51:12 -05:00
2012-02-08 19:30:39 -08:00
2018-01-12 17:05:11 +08:00
2017-09-07 15:42:31 +02:00
2018-03-24 20:27:11 +08:00
2017-03-02 11:50:48 +00:00
2018-05-01 17:40:03 +01:00

========================
Team and repository tags
========================

.. image:: https://governance.openstack.org/tc/badges/nova.svg
    :target: https://governance.openstack.org/tc/reference/tags/index.html

.. Change things from this point on

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:

- `Compute API Guide <https://developer.openstack.org/api-guide/compute/>`__
- `Compute API Reference <https://developer.openstack.org/api-ref/compute/>`__

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

- `OpenStack for App Developers <https://www.openstack.org/appdev/>`__
- `Development resources for OpenStack clouds
  <https://developer.openstack.org/>`__

Operators
---------

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

- `OpenStack Nova <https://docs.openstack.org/nova/>`__

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:

- `Bug Tracker <https://bugs.launchpad.net/nova>`__

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:

- `Official Nova Documentation <https://docs.openstack.org/nova/>`__
- `Official Client Documentation
  <https://docs.openstack.org/python-novaclient/>`__

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:

- `Nova Specs <http://specs.openstack.org/openstack/nova-specs/>`__

.. _Summit: https://www.openstack.org/summit/
.. _Project Team Gathering: https://www.openstack.org/ptg/
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