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Reviewed:  https://review.openstack.org/324380
Committed: https://git.openstack.org/cgit/openstack/neutron-lbaas/commit/?id=4effc9b96ef6317cefb25768dd60bd0f5f4abac5
Submitter: Jenkins
Branch:    master

commit 4effc9b96ef6317cefb25768dd60bd0f5f4abac5
Author: Evgeny Fedoruk <evgenyf@xxxxxxxxxxx>
Date:   Thu Jun 2 01:29:42 2016 -0700

    Preventing pool deletion if pool has healthmonitor
    
    If HM is associated to pool, HM should be deleted prior
    to pool deletion.
    Trying to delete pool with HM will fail with EntityInUse exception.
    This is to preserve common neutron's API concept to delete cascade
    resources' subresources only.
    
    Change-Id: I1bfc4d8d8ec7e83b1de11c8fb3e66282bfd06806
    Closes-Bug: 1571097


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

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https://bugs.launchpad.net/bugs/1571097

Title:
  unable to delete lbaasv2 health monitor if its listener deleted

Status in neutron:
  Fix Released

Bug description:
  problem is in Kilo neutron-lbaas branch.

  monitor is attached a pool.
  When pool and listener were deleted, not error reported that there is a health-monitor associated to pool.

  If all lbaas resoruces except health-monitor were deleted, health
  monitor can not be deleted.

  See the following procedure to reproduce this issue:

  $ neutron lbaas-loadbalancer-create --name=v-lb2 lb2-v-1574810802
  $ neutron lbaas-listener-create --protocol=HTTP --protocol-port=80 --name=v-lb2-1 --loadbalancer=v-lb2
  $ neutron lbaas-pool-create --lb-algorithm=ROUND_ROBIN --protocol=HTTP --name=v-lb2-pool  --listener=v-lb2-1
  $ neutron lbaas-member-create --subnet lb2-v-1574810802 --address 10.199.88.3 --protocol-port=80 v-lb2-pool
  $ neutron lbaas-member-create --subnet lb2-v-1574810802 --address 10.199.88.4 --protocol-port=80 v-lb2-pool
  $ neutron lbaas-healthmonitor-create --max-retries=3 --delay=3 --timeout=10 --type=HTTP --pool=v-lb2-pool
  $ neutron lbaas-member-delete 4d2977fc-5600-4dbf-8af2-35c017c8f4a0 v-lb2-pool 
  $ neutron lbaas-member-delete 2f60a49b-add1-43d6-97d8-4e53a925b25f  v-lb2-pool 
  $ neutron lbaas-pool-delete v-lb2-pool
  $ neutron lbaas-listener-delete v-lb2-1
  $ neutron lbaashealthmonitor-delete 044f98a5-755d-498d-a38e-18eb8ca13884

  neutron log seems point to lbaas resources were gone.
  In this specific issue, we should just remove the health monitor from system.

  2016-04-10 16:57:38.220 INFO neutron.wsgi [req-7e697943-e70d-4ac8-a840-b1edf441806a Venus Venus] 10.34.57.68 - - [10/Apr/2016 16:57:38] "GET /v2.0/lbaas/healthmonitors.json?fields=id&id=044f98a5-755d-498d-a38e-18eb8ca13884 HTTP/1.1" 200 444 0.112257
  2016-04-10 16:57:38.252 ERROR neutron.api.v2.resource [req-aaeae392-33b2-427c-96a0-918782882c9a Venus Venus] delete failed
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource Traceback (most recent call last):
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/api/v2/resource.py", line 83, in resource
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource     result = method(request=request, **args)
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource   File "/opt/stack/neutron/neutron/api/v2/base.py", line 490, in delete
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource     obj_deleter(request.context, id, **kwargs)
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource   File "/opt/stack/neutron-lbaas/neutron_lbaas/services/loadbalancer/plugin.py", line 906, in delete_healthmonitor
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource     constants.PENDING_DELETE)
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource   File "/opt/stack/neutron-lbaas/neutron_lbaas/db/loadbalancer/loadbalancer_dbv2.py", line 163, in test_and_set_status
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource     db_lb_child.root_loadbalancer.id)
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource   File "/opt/stack/neutron-lbaas/neutron_lbaas/db/loadbalancer/models.py", line 115, in root_loadbalancer
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource     return self.pool.listener.loadbalancer
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource AttributeError: 'NoneType' object has no attribute 'listener'
  2016-04-10 16:57:38.252 4158 TRACE neutron.api.v2.resource 
  2016-04-10 16:57:38.253 INFO neutron.wsgi [req-aaeae392-33b2-427c-96a0-918782882c9a Venus Venus] 10.34.57.68 - - [10/Apr/2016 16:57:38] "DELETE /v2.0/lbaas/healthmonitors/044f98a5-755d-498d-a38e-18eb8ca13884.json HTTP/1.1" 500 383 0.030720

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