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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

*** This bug is a duplicate of bug 1729621 ***
    https://bugs.launchpad.net/bugs/1729621

** This bug has been marked a duplicate of bug 1729621
   Inconsistent value for vcpu_used

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https://bugs.launchpad.net/bugs/1704179

Title:
  Too many period db actions in large scale clusters increase the  load
  of database

Status in OpenStack Compute (nova):
  In Progress

Bug description:
  Too many period db actions in large scale clusters increase the  load
  of database,  especially un-necessary db update or query.

  For example， over 1000 nodes, it will be 2 * 1000=2000 db update for
  compute_node table in 60s in _update_available_resource, but this two
  db update is not necessary if resource usage not changed.

  Delete the first and second _update()  in _init_compute_node can
  reduce two db update for one node in 60s, if resource usage not
  changed for this compute_node.

  Then the funtion self._resource_change(compute_node) in _update() make
  sense

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