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[nail-zte <nail@xxxxxxxxxx>]

Public bug reported:

There has one api cell and two child cell and four compute nodes,api cell has not compute node. I boot an instance and evacuate the instance, then return error:
[root@apicell ~(keystone_admin)]# nova evacuate test_vm5 
ERROR (NotFound): The resource could not be found. (HTTP 404) (Request-ID: req-63786e5b-1199-4e2a-a5c0-a1efde0398a8)

the error log in api cell nova-api.log in:
http://paste.openstack.org/show/482160/

The reason is that  nova api in api cell  first check compute node nova-compute status before evacuate the instance , it calls db.service_get_by_compute_host function, but the api cell db has not  compute node service record. Thus resulting in failure evacuate：
 Caught error: Compute host CL-SBCJ-5-3-4 could not be found

** Affects: horizon
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1527121

Title:
  cells: instance can not evacuate in cells

Status in OpenStack Dashboard (Horizon):
  New

Bug description:
  There has one api cell and two child cell and four compute nodes,api cell has not compute node. I boot an instance and evacuate the instance, then return error:
  [root@apicell ~(keystone_admin)]# nova evacuate test_vm5 
  ERROR (NotFound): The resource could not be found. (HTTP 404) (Request-ID: req-63786e5b-1199-4e2a-a5c0-a1efde0398a8)

  the error log in api cell nova-api.log in:
  http://paste.openstack.org/show/482160/

  The reason is that  nova api in api cell  first check compute node nova-compute status before evacuate the instance , it calls db.service_get_by_compute_host function, but the api cell db has not  compute node service record. Thus resulting in failure evacuate：
   Caught error: Compute host CL-SBCJ-5-3-4 could not be found

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