test_volume randomly fails on Python 3.4

[Victor Stinner]

For an unknown reason, "tox -e py34" randomly fails on the gates on test_volume. Example of failure:

2015-10-01 16:31:08.063 | ======================================================================
2015-10-01 16:31:08.063 | FAIL: cinder.tests.unit.test_volume.ConsistencyGroupTestCase.test_create_consistencygroup_from_src
2015-10-01 16:31:08.063 | ----------------------------------------------------------------------
2015-10-01 16:31:08.063 | Traceback (most recent call last):
2015-10-01 16:31:08.063 | File "/home/jenkins/workspace/gate-cinder-python34/.tox/py34/lib/python3.4/site-packages/mock/mock.py", line 1305, in patched
2015-10-01 16:31:08.063 | return func(*args, **keywargs)
2015-10-01 16:31:08.063 | File "/home/jenkins/workspace/gate-cinder-python34/cinder/tests/unit/test_volume.py", line 5088, in test_create_consistencygroup_from_src
2015-10-01 16:31:08.063 | self.assertEqual('consistencygroup.create.start', msg['event_type'])
2015-10-01 16:31:08.063 | File "/home/jenkins/workspace/gate-cinder-python34/.tox/py34/lib/python3.4/site-packages/testtools/testcase.py", line 350, in assertEqual
2015-10-01 16:31:08.064 | self.assertThat(observed, matcher, message)
2015-10-01 16:31:08.064 | File "/home/jenkins/workspace/gate-cinder-python34/.tox/py34/lib/python3.4/site-packages/testtools/testcase.py", line 435, in assertThat
2015-10-01 16:31:08.064 | raise mismatch_error
2015-10-01 16:31:08.064 | testtools.matchers._impl.MismatchError: 'consistencygroup.create.start' != 'volume.create.end'

Another example:

2015-10-02 15:07:35.950 | ======================================================================
2015-10-02 15:07:35.950 | FAIL: cinder.tests.unit.test_volume.ConsistencyGroupTestCase.test_create_consistencygroup_from_src
2015-10-02 15:07:35.951 | ----------------------------------------------------------------------
2015-10-02 15:07:35.951 | Traceback (most recent call last):
2015-10-02 15:07:35.951 | File "/home/jenkins/workspace/gate-cinder-python34/.tox/py34/lib/python3.4/site-packages/mock/mock.py", line 1305, in patched
2015-10-02 15:07:35.951 | return func(*args, **keywargs)
2015-10-02 15:07:35.951 | File "/home/jenkins/workspace/gate-cinder-python34/cinder/tests/unit/test_volume.py", line 5088, in test_create_consistencygroup_from_src
2015-10-02 15:07:35.951 | self.assertEqual('consistencygroup.create.start', msg['event_type'])
2015-10-02 15:07:35.951 | File "/home/jenkins/workspace/gate-cinder-python34/.tox/py34/lib/python3.4/site-packages/testtools/testcase.py", line 350, in assertEqual
2015-10-02 15:07:35.951 | self.assertThat(observed, matcher, message)
2015-10-02 15:07:35.951 | File "/home/jenkins/workspace/gate-cinder-python34/.tox/py34/lib/python3.4/site-packages/testtools/testcase.py", line 435, in assertThat
2015-10-02 15:07:35.951 | raise mismatch_error
2015-10-02 15:07:35.951 | testtools.matchers._impl.MismatchError: 'consistencygroup.create.start' != 'backup.createprogress'

[Victor Stinner (vstinner)]

I found at least 5 failures on 'consistencygroup.create.start' != 'volume.create.end'.

I used Kibana with the search query:

build_name:"gate-cinder-python34" AND build_status:"FAILURE" AND test_create_consistencygroup_from_src

Kibana: http://logstash.openstack.org/

[Eric Harney (eharney)]

Let's use https://bugs.launchpad.net/cinder/+bug/1501745 for this.