39 lines
1.6 KiB
ReStructuredText
39 lines
1.6 KiB
ReStructuredText
..
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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Convention for heading levels in Neutron devref:
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======= Heading 0 (reserved for the title in a document)
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------- Heading 1
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~~~~~~~ Heading 2
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+++++++ Heading 3
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''''''' Heading 4
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(Avoid deeper levels because they do not render well.)
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Transient DB Failure Injection
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==============================
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Neutron has a service plugin to inject random delays and Deadlock exceptions
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into normal Neutron operations. The service plugin is called 'Loki' and is
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located under neutron.services.loki.loki_plugin.
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To enable the plugin, just add 'loki' to the list of service_plugins in your
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neutron-server neutron.conf file.
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The plugin will inject a Deadlock exception on database flushes with a 1/50
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probability and a delay of 1 second with a 1/200 probability when SQLAlchemy
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objects are loaded into the persistent state from the DB. The goal is to ensure
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the code is tolerant of these transient delays/failures that will be experienced
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in busy production (and Galera) systems.
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