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[OpenStack Infra <1777591@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/576693
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=1d91811ad499af1d291f5c819ced5b1fdf3520c7
Submitter: Zuul
Branch:    master

commit 1d91811ad499af1d291f5c819ced5b1fdf3520c7
Author: xulei <xulei@xxxxxxxxxxxxxxxxxxxx>
Date:   Wed Jun 20 13:15:46 2018 +0800

    Disable limits if force_hosts or force_nodes is set
    
    Setting max_placement_results will make force_host invaild sometimes,
    especially in large-scale enviroment.
    Disable limit param in GET /allocation_candidates if force_hosts
    or force_nodes is set.
    
    Change-Id: Iff1b49fe7e6347e3c2bb5992494b2450809719a2
    Closes-Bug: #1777591


** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1777591

Title:
  ‘limit’ in allocation_candidates where sometimes make force_hosts
  invalid

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) queens series:
  Triaged

Bug description:
     Now 'limit' parameter in allocation_candidates api use default value 1000, this makes better performace in large scale environment. However, when creating a vm/bm with force_hosts to schedule, 'limit' parameter will cut some nodes out in allocation_candidates, and sometimes force_hosts method returns 'No hosts matched due to not matching...'
  Example:
     test environment with 10 compute nodes, set max_placement_results = 3
     nova boot test --image 9c09cb52-03b9-4631-898d-d443d0dbbf9e  --flavor c1 --nic none --availability-zone nova:devstack
     No hosts matched due to not matching 'force_hosts' value of 'devstack'

     Debug:
     return provider_summaries:
     {u'268a3d69-6cf1-418a-aaa8-f2127f4f4468':...,u'a2c3e9e7-53a6-4e15-b150-39bb4135c6a9':...u'0aa80b5e-a0fa-47a6-a4b5-51b21b721ce9':...}
     and node devstack:69d2fe55-e391-4d99-a1fe-8b0b5aad60e7 not in provider_summaries.
     I think in large scale environment(compute nodes > 2000), and set default max_placement_results=1000 will make force_hosts unavailable.

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