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[OpenStack Infra <1747936@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/542964
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=dc2d15129d1a86a841e3dc1ccab250c30d34c540
Submitter: Zuul
Branch:    master

commit dc2d15129d1a86a841e3dc1ccab250c30d34c540
Author: Surya Seetharaman <suryaseetharaman.9@xxxxxxxxx>
Date:   Fri Feb 9 18:54:05 2018 +0100

    Unmap compute nodes when deleting host mappings in delete cell operation
    
    Presently when a host_mapping is deleted during the nova-manage cell_v2
    delete_cell operation, the compute node record still remains with its
    mapped field set to 1. Due to this, if we delete a cell, and later
    create a new cell, the discover_hosts command will not work and the
    compute node will not get mapped to the new cell. This patch fixes this
    issue by setting it back to 0.
    
    Change-Id: Iaf13f11bcd0bb25f673fc28f252cb9391409b9b5
    Closes-Bug: #1747936


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

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https://bugs.launchpad.net/bugs/1747936

Title:
  Host is not unmapped when the host_mapping is deleted during
  delete_cell operation

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) pike series:
  In Progress
Status in OpenStack Compute (nova) queens series:
  In Progress

Bug description:
  Presently when a host_mapping is deleted during the nova-manage
  cell_v2 deleted_cell operation, the compute node record still remains
  with its mapped field set to 1. Due to this, if we delete a cell, and
  later create a new cell, the discover_hosts command will not work and
  the compute node will not get mapped to the new cell.

  Solution:

  Before the host is deleted during the delete_cell operation, the
  mapped field in compute_nodes table should be set to 0.

  This bug is similar to this one :
  https://bugs.launchpad.net/nova/+bug/1735719, hence what was done for
  the delete_host command should be done for the delete_cell command as
  well.

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