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[Surya Seetharaman <1747650@xxxxxxxxxxxxxxxxxx>]

** No longer affects: nova/pike

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https://bugs.launchpad.net/bugs/1747650

Title:
  Make bdms querying in multiple cells use scatter-gather

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) queens series:
  Fix Committed

Bug description:
  Currently the "_get_instance_bdms_in_multiple_cells" function in
  extended_volumes runs sequentially and this affects the performance in
  case of large deployments (running a lot of cells) :
  https://github.com/openstack/nova/blob/master/nova/api/openstack/compute/extended_volumes.py#L50

  So it would be nice to use the scatter_gather_cells function to do
  this operation in parallel.

  Also apart from the performance scaling point of view, in case
  connection to a particular cell fails, it would be nice to have
  sentinels returned which is done by the scatter_gather_cells function.
  This helps when a cell is down.

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