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[keerthivasan selvaraj <keerthiv@xxxxxxxxxxxxxxx>]

Public bug reported:

!!!!!!!!!!!!!!!!!!!!!!!!! READ THIS !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Description
===========
Mulit-cell Cell_v2 'discover_hosts' is not working after executing 'delete_host' operation to remove a specific host from the cell. 

Steps to reproduce
==================
*Consider I am having nova-compute service running on host 'compute3'
*nova-manage cell_v2 delete_host --cell_uuid d9a559a8-7d16-4e7c-8db2-82f28199509e --host compute3 (as per this https://review.openstack.org/513717 )
*Host entry was removed from host_mappings table
*Still service is up and Running on the local cell DB.
*I am trying to execute 'nova-manage cell_v2 discover_hosts --verbose'
*No host entry was created and got `Found 0 unmapped computes in cell: d9a559a8-7d16-4e7c-8db2-82f28199509e` message.

Expected result
===============

It should add the host that is not mapped to the cell.

Actual result
=============
nova-manage cell_v2 discover_hosts --verbose
Getting compute nodes from cell 'cell2': d9a559a8-7d16-4e7c-8db2-82f28199509e
Found 0 unmapped computes in cell: d9a559a8-7d16-4e7c-8db2-82f28199509e
Host is not added to the cell.

Environment
===========
Devstack(stable/pike) using nova-manage 16.0.3

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1735719

Title:
  Cell_v2 discover_hosts Not Working, after deleted a host from a cell

Status in OpenStack Compute (nova):
  New

Bug description:
  !!!!!!!!!!!!!!!!!!!!!!!!! READ THIS !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

  Description
  ===========
  Mulit-cell Cell_v2 'discover_hosts' is not working after executing 'delete_host' operation to remove a specific host from the cell. 

  Steps to reproduce
  ==================
  *Consider I am having nova-compute service running on host 'compute3'
  *nova-manage cell_v2 delete_host --cell_uuid d9a559a8-7d16-4e7c-8db2-82f28199509e --host compute3 (as per this https://review.openstack.org/513717 )
  *Host entry was removed from host_mappings table
  *Still service is up and Running on the local cell DB.
  *I am trying to execute 'nova-manage cell_v2 discover_hosts --verbose'
  *No host entry was created and got `Found 0 unmapped computes in cell: d9a559a8-7d16-4e7c-8db2-82f28199509e` message.

  Expected result
  ===============

  It should add the host that is not mapped to the cell.

  Actual result
  =============
  nova-manage cell_v2 discover_hosts --verbose
  Getting compute nodes from cell 'cell2': d9a559a8-7d16-4e7c-8db2-82f28199509e
  Found 0 unmapped computes in cell: d9a559a8-7d16-4e7c-8db2-82f28199509e
  Host is not added to the cell.

  Environment
  ===========
  Devstack(stable/pike) using nova-manage 16.0.3

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