a7505ee648
If system time is adjusted first forward and then backward while a nova service is running (e.g. nova-compute), then there is a high probability, that periodic tasks will stop for the duration of time the system clock was adjusted backward. This was supposed to be fixed by the following patch to oslo.service https://review.openstack.org/#/c/286838/ , but the order of imports in unit tests and production code is different, so nova services end up starting with the default eventlet hub, that does not use a monotonic clock and, thus, is affected by changes of system time. Testing this is problematic, as it's a subject of imports order and is not reproduced in functional or unit tests (oslo_service is always imported earlier than eventlet hub is initialized, so it just does "the right thing"). The alternative is to make an assertion when services start. Closes-Bug: #1510234 Change-Id: I110cf31ad2a0c74a0cf30ec08bd94d3a56727b39
36 lines
1.2 KiB
Python
36 lines
1.2 KiB
Python
# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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:mod:`nova` -- Cloud IaaS Platform
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===================================
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.. automodule:: nova
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:platform: Unix
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:synopsis: Infrastructure-as-a-Service Cloud platform.
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"""
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import os
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os.environ['EVENTLET_NO_GREENDNS'] = 'yes'
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# NOTE(rpodolyaka): import oslo_service first, so that it makes eventlet hub
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# use a monotonic clock to avoid issues with drifts of system time (see
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# LP 1510234 for details)
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import oslo_service # noqa
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import eventlet # noqa
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