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[Stephen Finucane <stephen.finucane@xxxxxxxxx>]

** Also affects: oslo.service
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1354403

Title:
  Numerous config options ignored due to CONF used in import context

Status in OpenStack Compute (nova):
  Confirmed
Status in oslo.service:
  New

Bug description:
  In general[1] it is incorrect to use the value of a config variable at
  import time, because although the config variable may have been
  registered, its value will not have been loaded. The result will
  always be the default value, regardless of the contents of the
  relevant config file.

  I did a quick scan of Nova, and found the following instances of
  config variables being used in import context:

  nova/api/openstack/common.py:limited()
  nova/api/openstack/common.py:get_limit_and_marker()
  nova/compute/manager.py:_heal_instance_info_cache()
  nova/compute/manager.py:_poll_shelved_instances()
  nova/compute/manager.py:_poll_bandwidth_usage()
  nova/compute/manager.py:_poll_volume_usage()
  nova/compute/manager.py:_sync_power_states()
  nova/compute/manager.py:_cleanup_running_deleted_instances()
  nova/compute/manager.py:_run_image_cache_manager_pass()
  nova/compute/manager.py:_run_pending_deletes()
  nova/network/manager.py:_periodic_update_dns()
  nova/scheduler/manager.py:_run_periodic_tasks()

  Consequently, it appears that the given values of the following config
  variables are being ignored:

  osapi_max_limit
  heal_instance_info_cache_interval
  shelved_poll_interval
  bandwidth_poll_interval
  volume_usage_poll_interval
  sync_power_state_interval
  running_deleted_instance_poll_interval
  image_cache_manager_interval
  instance_delete_interval
  dns_update_periodic_interval
  scheduler_driver_task_period

  [1] This doesn't apply to drivers, which are loaded dynamically after
  the config has been loaded. However, relying on that seems even
  nastier.

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