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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

discover_hosts_in_cells_interval is not mandatory, and discover_hosts
can be run in deployment tooling when a new compute node is deployed.
One of the goals of cells v2 is isolation from the cell to the API DB,
so for the cell to be able to register itself with the API DB would
require an "up-call" to the API DB to do so which violates that
isolation.

** Tags added: cells

** Changed in: nova
       Status: New => Opinion

** Changed in: nova
   Importance: Undecided => Wishlist

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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):
  Opinion

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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