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[Bug 1759306] [NEW] Scheduler host manager does not filter out cell0 from the list of cell candidates before scheduling

 

Public bug reported:

Currently the nova scheduler does not filter out cell0 from the list of
cells that it considers for scheduling. Since cell0 does not have any
computes and is only a graveyard cell, it should be filtered out from
the global cell cache that is maintained by the host_manager
(https://github.com/openstack/nova/blob/master/nova/scheduler/host_manager.py#L639)
and should not be a candidate cell for scheduling. It will anyways be
filtered out due to not having computes every time during scheduling,
however if this is done earlier on, it will optimize the scheduling.

** Affects: nova
     Importance: Low
     Assignee: Surya Seetharaman (tssurya)
         Status: New


** Tags: cells scheduler

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https://bugs.launchpad.net/bugs/1759306

Title:
  Scheduler host manager does not filter out cell0 from the list of cell
  candidates before scheduling

Status in OpenStack Compute (nova):
  New

Bug description:
  Currently the nova scheduler does not filter out cell0 from the list
  of cells that it considers for scheduling. Since cell0 does not have
  any computes and is only a graveyard cell, it should be filtered out
  from the global cell cache that is maintained by the host_manager
  (https://github.com/openstack/nova/blob/master/nova/scheduler/host_manager.py#L639)
  and should not be a candidate cell for scheduling. It will anyways be
  filtered out due to not having computes every time during scheduling,
  however if this is done earlier on, it will optimize the scheduling.

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