Reviewed:  https://review.openstack.org/541246
Committed: 
https://git.openstack.org/cgit/openstack/nova/commit/?id=ea6757092df85b6cce38980ae5b7f54b76657e01
Submitter: Zuul
Branch:    master

commit ea6757092df85b6cce38980ae5b7f54b76657e01
Author: Surya Seetharaman <suryaseetharama...@gmail.com>
Date:   Tue Feb 6 12:36:50 2018 +0100

    Make bdms querying in multi-cell use scatter-gather and ignore down cell
    
    This patch makes the querying of bdms from multiple cells in the
    _get_instance_bdms_in_multiple_cells function of extended_volumes use
    scatter_gather_cells thus making the process, parallel. It also adds
    warnings in case a cell is not available; which the operator can later
    tweak, if an exception needs to be raised. So for now, cells that are
    not reachable are ignored and it proceeds to the next cell.
    
    Change-Id: I0e05eb1e2ad37962968b79100bf4a96c7d6ddd8f
    Closes-Bug: #1747650


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

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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

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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