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[Matt Riedemann <mriedem@xxxxxxxxxx>]

cells v1 is frozen so we can focus on cells v2, as such this is a latent
and not trivial bug to fix, so marking it as won't fix.

See item #2 here:

http://docs.openstack.org/developer/nova/cells.html#status

** Changed in: nova
       Status: Confirmed => Won't Fix

** Changed in: nova
   Importance: Wishlist => Undecided

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https://bugs.launchpad.net/bugs/1539056

Title:
  nova service-list failed when one or some cell-service exception  of
  multiple child cells

Status in OpenStack Compute (nova):
  Won't Fix

Bug description:
  1. version
  kilo 2015.1.0

  2. Relevant log

  2016-01-28 20:16:27.232 26909 ERROR nova.cells.messaging [req-8daf498b-d2ae-42e6-9089-40046ec550d3 f04e318acd7e4e5093c91e6dc74a28c3 53adc6d6825b43378d6ab89fc38051da - - -] Error waiting for responses from neighbor cells
  2016-01-28 20:16:27.232 26909 TRACE nova.cells.messaging Traceback (most recent call last):
  2016-01-28 20:16:27.232 26909 TRACE nova.cells.messaging   File "/usr/lib/python2.7/site-packages/nova/cells/messaging.py", line 549, in process
  2016-01-28 20:16:27.232 26909 TRACE nova.cells.messaging     num_responses=len(next_hops))
  2016-01-28 20:16:27.232 26909 TRACE nova.cells.messaging   File "/usr/lib/python2.7/site-packages/nova/cells/messaging.py", line 235, in _wait_for_json_responses
  2016-01-28 20:16:27.232 26909 TRACE nova.cells.messaging     raise exception.CellTimeout()
  2016-01-28 20:16:27.232 26909 TRACE nova.cells.messaging CellTimeout: Timeout waiting for response from cell
  2016-01-28 20:16:27.232 26909 TRACE nova.cells.messaging 

  3. Reproduce steps:

  3.1 environment described

  I have a api cell node：api-cell,
  two child cell node： child-cell-01 child-cell-02，
  and each child_cell have one compute node

  3.2 
  excuate “systemctl stop openstack-nova-cells.service” on  child-cell-01

  openstack-nova-cells.service - OpenStack Nova Cells Server
     Loaded: loaded (/usr/lib/systemd/system/openstack-nova-cells.service; enabled)
     Active: inactive (dead) since Thu 2016-01-28 19:54:50 CST; 24min ago
    Process: 2566 ExecStart=/usr/bin/nova-cells (code=exited, status=0/SUCCESS)
   Main PID: 2566 (code=exited, status=0/SUCCESS)
   

  3.3 excuate “nova service-list” on api-cell
  Expected result: list all service and status（Tolerance does not contain service on child-cell-01 and it‘s compute node）
  Actual result ： ERROR, log reference section 2

  
  4
  Only one or some cell’s service exception of many child cell lead to nova service-list failed isunreasonable

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