Description of problem:

Problem of Amphora failover to another compute node.

Version-Release number of selected component (if applicable):

openstack-neutron-openvswitch-12.0.5-4.el7ost.noarch        Mon May 20 05:39:17 2019
openvswitch-2.9.0-97.el7fdp.x86_64                          Mon May 20 05:39:15 2019
openvswitch-ovn-central-2.9.0-97.el7fdp.x86_64              Mon May 20 05:39:17 2019
openvswitch-ovn-common-2.9.0-97.el7fdp.x86_64               Mon May 20 05:39:15 2019
openvswitch-ovn-host-2.9.0-97.el7fdp.x86_64                 Mon May 20 05:39:17 2019
openvswitch-selinux-extra-policy-1.0-9.el7fdp.noarch        Mon May 20 05:39:07 2019
python-openvswitch-2.9.0-97.el7fdp.x86_64                   Mon May 20 05:39:15 2019

We can see in the logs errors:

2019-06-10 01:49:23.373 29 ERROR ovsdbapp.backend.ovs_idl.transaction

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/connection.py", line 99, in run
    txn.results.put(txn.do_commit())
  File "/usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/transaction.py", line 86, in do_commit
    command.run_idl(txn)
  File "/usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/command.py", line 301, in run_idl
    if isinstance(getattr(record, self.column), dict):
  File "/usr/lib64/python2.7/site-packages/ovs/db/idl.py", line 816, in __getattr__
    del dmap[key]
KeyError: u'host-xx-xx-xx-xx'


Seems similar to https://bugzilla.redhat.com/show_bug.cgi?id=1629934