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[Rodolfo Alonso <2102609@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Since [1], when a new agent is added, the event (SEGMENT_HOST_MAPPING, AFTER_CREATE) is called. That calls the method ``auto_schedule_new_network_segments`` [2]. If the "segments" plugin is not loaded, that will raise the following exception: [3]
"""
ERROR neutron_lib.callbacks.manager [None req-7a8042b5-ec95-432e-a03c-3770628cc424 None None] Error during notification for neutron.plugins.ml2.plugin.DhcpAgentSchedulerDbMixin.auto_schedule_new_network_segments-2354089 segment_host_mapping, after_create: AttributeError: 'NoneType' object has no attribute 'get_segments'
ERROR neutron_lib.callbacks.manager Traceback (most recent call last):
ERROR neutron_lib.callbacks.manager   File "/opt/stack/neutron-lib/neutron_lib/callbacks/manager.py", line 189, in _notify_loop
ERROR neutron_lib.callbacks.manager     callback.method(resource, event, trigger, payload=payload)
ERROR neutron_lib.callbacks.manager   File "/opt/stack/neutron/neutron/db/agentschedulers_db.py", line 494, in auto_schedule_new_network_segments
ERROR neutron_lib.callbacks.manager     segments = segment_plugin.get_segments(
ERROR neutron_lib.callbacks.manager AttributeError: 'NoneType' object has no attribute 'get_segments'
ERROR neutron_lib.callbacks.manager 
"""

[1]https://review.opendev.org/q/I8112076f8acb821752941396e7aa39ecb1352ca3
[2]https://github.com/openstack/neutron/blob/e47aed1508badcf2f52e0a5ced932abf9ff73655/neutron/db/agentschedulers_db.py#L487-L509
[3]https://paste.opendev.org/show/bZRtBWdRNT8o8roOSlm1/

** Affects: neutron
     Importance: Medium
     Assignee: Rodolfo Alonso (rodolfo-alonso-hernandez)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => Rodolfo Alonso (rodolfo-alonso-hernandez)

** Changed in: neutron
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/2102609

Title:
  DHCP scheduler failing when an agent is added and "segments" plugin
  not loaded

Status in neutron:
  New

Bug description:
  Since [1], when a new agent is added, the event (SEGMENT_HOST_MAPPING, AFTER_CREATE) is called. That calls the method ``auto_schedule_new_network_segments`` [2]. If the "segments" plugin is not loaded, that will raise the following exception: [3]
  """
  ERROR neutron_lib.callbacks.manager [None req-7a8042b5-ec95-432e-a03c-3770628cc424 None None] Error during notification for neutron.plugins.ml2.plugin.DhcpAgentSchedulerDbMixin.auto_schedule_new_network_segments-2354089 segment_host_mapping, after_create: AttributeError: 'NoneType' object has no attribute 'get_segments'
  ERROR neutron_lib.callbacks.manager Traceback (most recent call last):
  ERROR neutron_lib.callbacks.manager   File "/opt/stack/neutron-lib/neutron_lib/callbacks/manager.py", line 189, in _notify_loop
  ERROR neutron_lib.callbacks.manager     callback.method(resource, event, trigger, payload=payload)
  ERROR neutron_lib.callbacks.manager   File "/opt/stack/neutron/neutron/db/agentschedulers_db.py", line 494, in auto_schedule_new_network_segments
  ERROR neutron_lib.callbacks.manager     segments = segment_plugin.get_segments(
  ERROR neutron_lib.callbacks.manager AttributeError: 'NoneType' object has no attribute 'get_segments'
  ERROR neutron_lib.callbacks.manager 
  """

  [1]https://review.opendev.org/q/I8112076f8acb821752941396e7aa39ecb1352ca3
  [2]https://github.com/openstack/neutron/blob/e47aed1508badcf2f52e0a5ced932abf9ff73655/neutron/db/agentschedulers_db.py#L487-L509
  [3]https://paste.opendev.org/show/bZRtBWdRNT8o8roOSlm1/

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