[nova] Bug #1755266: How to proceed with test failures

Clemens Hardewig clemens.hardewig at crandale.de
Sun Jun 2 19:09:23 UTC 2019

Hi there,

Since Pike I am struggling with instance migration/instance resize for flavors whose swap space is provided via an lvm volume; according to my understanding the default behavior if cinder uses lvm as a backend driver (at least I could not convince cinder to behave different …). I am somewhat surprised that I seem to be the only one who has some problems with that behavior - according to my understanding you are coming into this constellation automatically when simply following the manual installation procedure as being described in the official Openstack docs... 

Anyway I opened the bug above, however it did not find some interest and I tried then as a python newbie to get it fixed by my own. After a lengthy live test phase of my changes in the driver.py across Pike, Queens, Rocky, and now also Stein, I made then my first commit (yeee - got it done) to the master branch, had a good short conversation with Eric in Berlin on it, fixed some code format issues Zuul was rightfully complaining about but then unfortunately failed some further tests in Zuul  and other test areas. (see https://review.opendev.org/#/c/618621/ <https://review.opendev.org/#/c/618621/>). 

Related to my changes, tox gets me an error:


Captured traceback:
    Traceback (most recent call last):
      File "nova/tests/unit/virt/libvirt/test_driver.py", line 18707, in test_finish_migration_power_on
      File "/opt/stack/nova/.tox/py27/local/lib/python2.7/site-packages/mock/mock.py", line 1305, in patched
        return func(*args, **keywargs)
      File "nova/tests/unit/virt/libvirt/test_driver.py", line 18662, in _test_finish_migration
        mock_raw_to_qcow2.assert_has_calls(convert_calls, any_order=True)
      File "/opt/stack/nova/.tox/py27/local/lib/python2.7/site-packages/mock/mock.py", line 983, in assert_has_calls
        ), cause)
      File "/opt/stack/nova/.tox/py27/local/lib/python2.7/site-packages/six.py", line 737, in raise_from
        raise value
    AssertionError: (call('/tmp/tmpC60sPk/tmpOHikWL/8ea1de33-64d7-4d1d-af02-88e6f7ec91c1/disk.swap'),) not all found in call list

but I failed yet to develop any idea what needs to be done to get the test failure fixed. I am missing context here how the logic of the test code works; therefore I would like to ask whether somebody could point me in the right direction what needs to be done to get the failed unit/Zuul/other Tests passed. Are there any docs or helps alongside testing in Nova where to learn what to do?

Perhaps also someone could give me a hint whether there are some conceptually misleading ideas behind my fix proposal which need to be driven into another direction …

I am looking forward to your reply

Best regards


Clemens Hardewig

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