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[xhzhf <guoyongxhzhf@xxxxxxx>]

Public bug reported:

Description
===========
we used rally to create instances concurrently.
we found it is slow and Nova queryed compute nodes in cell0 

Steps to reproduce
==================
use rally to create instances concurrently.

Expected result
===============
Nova should not query compute nodes in Cell0

Actual result
=============
Nova query compute nodes in Cell0

Environment
===========
1. Exact version of OpenStack you are running. See the following
  list for all releases: http://docs.openstack.org/releases/
   openstack-nova-scheduler-16.0.3-1.el7.noarch
   openstack-nova-placement-api16.0.3-1.el7.noarch


2. Which hypervisor did you use?
   KVM. We have 2000 hosts

2. Which storage type did you use?
   Our own storage device

3. Which networking type did you use?
   Our own network device

Logs & Analysis
==============
4916532:2017-12-14 13:59:45.473 1581 DEBUG nova.scheduler.host_manager [req-2d5fb838-d92c-49b9-a32d-0791185152c4 04433cd94b5f4982b224ff0f2afbf3f3 16cab611766742398402a19b9a58d71f - default default] Getting compute nodes and services for cell 00000000-0000-0000-0000-000000000000(cell0) _get_computes_for_cells /usr/lib/python2.7/site-packages/nova/scheduler/host_manager.py:608

** Affects: nova
     Importance: Undecided
     Assignee: xhzhf (guoyongxhzhf)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => xhzhf (guoyongxhzhf)

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https://bugs.launchpad.net/bugs/1739545

Title:
  [cellv2] performance issue when querying compute nodes in a cell

Status in OpenStack Compute (nova):
  New

Bug description:
  Description
  ===========
  we used rally to create instances concurrently.
  we found it is slow and Nova queryed compute nodes in cell0 

  Steps to reproduce
  ==================
  use rally to create instances concurrently.

  Expected result
  ===============
  Nova should not query compute nodes in Cell0

  Actual result
  =============
  Nova query compute nodes in Cell0

  Environment
  ===========
  1. Exact version of OpenStack you are running. See the following
    list for all releases: http://docs.openstack.org/releases/
     openstack-nova-scheduler-16.0.3-1.el7.noarch
     openstack-nova-placement-api16.0.3-1.el7.noarch

  
  2. Which hypervisor did you use?
     KVM. We have 2000 hosts

  2. Which storage type did you use?
     Our own storage device

  3. Which networking type did you use?
     Our own network device

  Logs & Analysis
  ==============
  4916532:2017-12-14 13:59:45.473 1581 DEBUG nova.scheduler.host_manager [req-2d5fb838-d92c-49b9-a32d-0791185152c4 04433cd94b5f4982b224ff0f2afbf3f3 16cab611766742398402a19b9a58d71f - default default] Getting compute nodes and services for cell 00000000-0000-0000-0000-000000000000(cell0) _get_computes_for_cells /usr/lib/python2.7/site-packages/nova/scheduler/host_manager.py:608

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