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[Bug 1846820] Fix included in openstack/nova xena-eom

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This issue was fixed in the openstack/nova xena-eom  release.

** Changed in: nova/xena
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1846820

Title:
  nova-conductor may crash during deploy due to haproxy-keystone 504

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) wallaby series:
  In Progress
Status in OpenStack Compute (nova) xena series:
  Fix Released
Status in OpenStack Compute (nova) yoga series:
  Fix Released

Bug description:
  keystone was busy (behind haproxy)

  nova-conductor:
  2019-10-04 15:39:17.103 6 CRITICAL nova [-] Unhandled error: GatewayTimeout: Gateway Timeout (HTTP 504)
  2019-10-04 15:39:17.103 6 ERROR nova Traceback (most recent call last):
  2019-10-04 15:39:17.103 6 ERROR nova   File "/var/lib/kolla/venv/bin/nova-conductor", line 10, in <module>
  2019-10-04 15:39:17.103 6 ERROR nova     sys.exit(main())
  2019-10-04 15:39:17.103 6 ERROR nova   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/cmd/conductor.py", line 44, in main
  2019-10-04 15:39:17.103 6 ERROR nova     topic=rpcapi.RPC_TOPIC)
  2019-10-04 15:39:17.103 6 ERROR nova   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/service.py", line 257, in create
  2019-10-04 15:39:17.103 6 ERROR nova     periodic_interval_max=periodic_interval_max)
  2019-10-04 15:39:17.103 6 ERROR nova   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/service.py", line 129, in __init__
  2019-10-04 15:39:17.103 6 ERROR nova     self.manager = manager_class(host=self.host, *args, **kwargs)
  2019-10-04 15:39:17.103 6 ERROR nova   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/conductor/manager.py", line 117, in __init__
  2019-10-04 15:39:17.103 6 ERROR nova     self.compute_task_mgr = ComputeTaskManager()
  2019-10-04 15:39:17.103 6 ERROR nova   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/conductor/manager.py", line 243, in __init__
  2019-10-04 15:39:17.103 6 ERROR nova     self.report_client = report.SchedulerReportClient()
  2019-10-04 15:39:17.103 6 ERROR nova   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/scheduler/client/report.py", line 186, in __init__
  2019-10-04 15:39:17.103 6 ERROR nova     self._client = self._create_client()
  2019-10-04 15:39:17.103 6 ERROR nova   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/scheduler/client/report.py", line 229, in _create_client
  2019-10-04 15:39:17.103 6 ERROR nova     client = self._adapter or utils.get_sdk_adapter('placement')
  2019-10-04 15:39:17.103 6 ERROR nova   File "/var/lib/kolla/venv/lib/python2.7/site-packages/nova/utils.py", line 1039, in get_sdk_adapter
  2019-10-04 15:39:17.103 6 ERROR nova     return getattr(conn, service_type)
  2019-10-04 15:39:17.103 6 ERROR nova   File "/var/lib/kolla/venv/lib/python2.7/site-packages/openstack/service_description.py", line 92, in __get__
  2019-10-04 15:39:17.103 6 ERROR nova     endpoint = proxy_mod.Proxy.get_endpoint(proxy)
  2019-10-04 15:39:17.103 6 ERROR nova   File "/var/lib/kolla/venv/lib/python2.7/site-packages/keystoneauth1/adapter.py", line 282, in get_endpoint
  2019-10-04 15:39:17.103 6 ERROR nova     return self.session.get_endpoint(auth or self.auth, **kwargs)
  2019-10-04 15:39:17.103 6 ERROR nova   File "/var/lib/kolla/venv/lib/python2.7/site-packages/keystoneauth1/session.py", line 1200, in get_endpoint
  2019-10-04 15:39:17.103 6 ERROR nova     return auth.get_endpoint(self, **kwargs)
  2019-10-04 15:39:17.103 6 ERROR nova   File "/var/lib/kolla/venv/lib/python2.7/site-packages/keystoneauth1/identity/base.py", line 380, in get_endpoint
  2019-10-04 15:39:17.103 6 ERROR nova     allow_version_hack=allow_version_hack, **kwargs)
  2019-10-04 15:39:17.103 6 ERROR nova   File "/var/lib/kolla/venv/lib/python2.7/site-packages/keystoneauth1/identity/base.py", line 271, in get_endpoint_data
  2019-10-04 15:39:17.103 6 ERROR nova     service_catalog = self.get_access(session).service_catalog
  2019-10-04 15:39:17.103 6 ERROR nova   File "/var/lib/kolla/venv/lib/python2.7/site-packages/keystoneauth1/identity/base.py", line 134, in get_access
  2019-10-04 15:39:17.103 6 ERROR nova     self.auth_ref = self.get_auth_ref(session)
  2019-10-04 15:39:17.103 6 ERROR nova   File "/var/lib/kolla/venv/lib/python2.7/site-packages/keystoneauth1/identity/generic/base.py", line 208, in get_auth_ref
  2019-10-04 15:39:17.103 6 ERROR nova     return self._plugin.get_auth_ref(session, **kwargs)
  2019-10-04 15:39:17.103 6 ERROR nova   File "/var/lib/kolla/venv/lib/python2.7/site-packages/keystoneauth1/identity/v3/base.py", line 184, in get_auth_ref
  2019-10-04 15:39:17.103 6 ERROR nova     authenticated=False, log=False, **rkwargs)
  2019-10-04 15:39:17.103 6 ERROR nova   File "/var/lib/kolla/venv/lib/python2.7/site-packages/keystoneauth1/session.py", line 1106, in post
  2019-10-04 15:39:17.103 6 ERROR nova     return self.request(url, 'POST', **kwargs)
  2019-10-04 15:39:17.103 6 ERROR nova   File "/var/lib/kolla/venv/lib/python2.7/site-packages/keystoneauth1/session.py", line 943, in request
  2019-10-04 15:39:17.103 6 ERROR nova     raise exceptions.from_response(resp, method, url)
  2019-10-04 15:39:17.103 6 ERROR nova GatewayTimeout: Gateway Timeout (HTTP 504)
  2019-10-04 15:39:17.103 6 ERROR nova

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