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[Attila Fazekas <afazekas@xxxxxxxxxx>]

Public bug reported:

'nova-manage cell_v2 discover_hosts' usage should not be needed,
the compute nodes at start up time could ask for registration
 and not repeat it during the n-cpu process lifetime.

In case of you have 30k compute node and restarting
them every two week in average, it would generate
~ 0.03 avg. request per sec. 

I do not see why it is mandatory to use

nova-manage cell_v2 discover_hosts  or 
[scheduler]
discover_hosts_in_cells_interval = 300

even in a small deployment.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1820851

Title:
  Please do cell mapping without periodic task or active admin
  involvment

Status in OpenStack Compute (nova):
  New

Bug description:
  'nova-manage cell_v2 discover_hosts' usage should not be needed,
  the compute nodes at start up time could ask for registration
   and not repeat it during the n-cpu process lifetime.

  In case of you have 30k compute node and restarting
  them every two week in average, it would generate
  ~ 0.03 avg. request per sec. 

  I do not see why it is mandatory to use

  nova-manage cell_v2 discover_hosts  or 
  [scheduler]
  discover_hosts_in_cells_interval = 300

  even in a small deployment.

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