grizzly: nova filter_scheduler: Select from a subset of hosts

[Tom Fifield]

https://review.openstack.org/19823 introduced a new configuration option in nova:

36 cfg.IntOpt('scheduler_host_subset_size',
   37 default=1,
   38 help='New instances will be scheduled on a host chosen '
   39 'randomly from a subset of the N best hosts. This '
   40 'property defines the subset size that a host is '
   41 'chosen from. A value of 1 chooses the '
   42 'first host returned by the weighing functions. '
   43 'This value must be at least 1. Any value less than 1 '
   44 'will be ignored, and 1 will be used instead')

    Adding a subset of best hosts to choose a host from, instead
    of choosing the host with the highest weight. The subset size is
    configurable. Setting the subset size to 1 will mimic the old
    behavior.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/22171

[Tom Fifield (fifieldt)]

https://review.openstack.org/22171

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/22171
Committed: http://github.com/openstack/openstack-manuals/commit/aa3ae37657599b0d0aee49105cdf4bd5f9cf49d8
Submitter: Jenkins
Branch: master

commit aa3ae37657599b0d0aee49105cdf4bd5f9cf49d8
Author: Tom Fifield <email address hidden>
Date: Mon Feb 18 16:43:23 2013 +1100

    Doc scheduler_host_subset_size option

    fixes bug 1128545

    Grizzly brings the scheduler_host_subset_size option, which gives
    more than one host to be selected for scheduling, as opposed to
    previously only the highest weighted host.

    Adds the option to the config reference.

    Missing <tr> tag fixed, spelling errors (not in the added row).

    Change-Id: I4b96581ed7ef3d077b95a8e4aae39ba6f74cff53