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[LIU Yulong <yulong@xxxxxxxxxxxxx>]

Please see the alternative fix:
https://review.openstack.org/#/c/324380/

** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1450375

Title:
  cannot delete v2 healthmonitor if the hm-associated-pool was deleted
  first

Status in neutron:
  Fix Released

Bug description:
  Steps:
  1. create lb
  2. create listener
  3. create pool  (pool-1)
  4. add a healthmonitor (healthmonitor-1) to pool-1
  5. delete the pool-1

  Then, you cannot delete healthmonitor-1 if the pool-1 was deleted
  first.

  
  Log:

  2015-04-30 16:51:23.422 6369 INFO neutron.wsgi [req-2876374c-03c3-49b6-825c-83116108cbed cf6a52a3be734e4cad457d5283148882 356b4d225c7e44de961d888086948f7c - - -] 172.16.2.10 - - [30/Apr/2015 16:51:23] "GET /v2.0/lbaas/healthmonitors.json?tenant_id=356b4d225c7e44de961d888086948f7c HTTP/1.1" 200 754 0.280336
  2015-04-30 16:51:23.430 6369 INFO neutron.wsgi [-] (6369) accepted ('172.16.2.10', 17115)
  2015-04-30 16:51:23.532 6369 ERROR neutron.api.v2.resource [req-88a2316d-805a-4bad-a52b-b270325008e7 cf6a52a3be734e4cad457d5283148882 356b4d225c7e44de961d888086948f7c - - -] delete failed
  2015-04-30 16:51:23.532 6369 TRACE neutron.api.v2.resource Traceback (most recent call last):
  2015-04-30 16:51:23.532 6369 TRACE neutron.api.v2.resource   File "/usr/lib/python2.6/site-packages/neutron/api/v2/resource.py", line 83, in resource
  2015-04-30 16:51:23.532 6369 TRACE neutron.api.v2.resource     result = method(request=request, **args)
  2015-04-30 16:51:23.532 6369 TRACE neutron.api.v2.resource   File "/usr/lib/python2.6/site-packages/neutron/api/v2/base.py", line 490, in delete
  2015-04-30 16:51:23.532 6369 TRACE neutron.api.v2.resource     obj_deleter(request.context, id, **kwargs)
  2015-04-30 16:51:23.532 6369 TRACE neutron.api.v2.resource   File "/usr/lib/python2.6/site-packages/neutron_lbaas/services/loadbalancer/plugin.py", line 887, in delete_healthmonitor
  2015-04-30 16:51:23.532 6369 TRACE neutron.api.v2.resource     constants.PENDING_DELETE)
  2015-04-30 16:51:23.532 6369 TRACE neutron.api.v2.resource   File "/usr/lib/python2.6/site-packages/neutron_lbaas/db/loadbalancer/loadbalancer_dbv2.py", line 159, in test_and_set_status
  2015-04-30 16:51:23.532 6369 TRACE neutron.api.v2.resource     db_lb_child.root_loadbalancer.id)
  2015-04-30 16:51:23.532 6369 TRACE neutron.api.v2.resource   File "/usr/lib/python2.6/site-packages/neutron_lbaas/db/loadbalancer/models.py", line 115, in root_loadbalancer
  2015-04-30 16:51:23.532 6369 TRACE neutron.api.v2.resource     return self.pool.listener.loadbalancer
  2015-04-30 16:51:23.532 6369 TRACE neutron.api.v2.resource AttributeError: 'NoneType' object has no attribute 'listener'

  
  Code:

  class HealthMonitorV2(model_base.BASEV2, models_v2.HasId,
  models_v2.HasTenant):

      ...

      @property
      def root_loadbalancer(self):
          return self.pool.listener.loadbalancer

  
  Potential Solution:
  1. Check pool whether binding a healthmonitor before delete
  2. Add loadbalancer attr to HealthMonitorV2

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