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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

** Also affects: nova/queens
   Importance: Undecided
       Status: New

** Changed in: nova/queens
       Status: New => In Progress

** Changed in: nova/queens
   Importance: Undecided => Medium

** Changed in: nova/queens
     Assignee: (unassigned) => Elod Illes (elod-illes)

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https://bugs.launchpad.net/bugs/1746561

Title:
  Make host_manager use scatter-gather and ignore down cells

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

Bug description:
  Currently the "_get_computes_for_cells" function in the host_manager
  of scheduler runs sequentially and this affects the performance in
  case of large deployments (running a lot of cells) :

  https://github.com/openstack/nova/blob/stable/pike/nova/scheduler/host_manager.py#L601

  So it would be nice to use the scatter_gather_all_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_all_cells. This
  helps when a cell is down.

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