openstack/puppet-openstack-specs
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Setting up specs project
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hogepodge
2014-05-21 11:54:07 -07:00
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puppet-openstack-specs
======================
Puppet Openstack Specifications
===============================
puppet-openstack design documents
This git repository is used to hold approved design specifications for additions
to the Puppet Openstack projects. Reviews of the specs are done in gerrit, using
a similar workflow to how we review and merge changes to the code itself.
The layout of this repository is::
specs/<release>/
You can find a template spec in `specs/template.rst`.
Specifications are proposed for a given release by adding them to the
`specs/<release>` directory and posting it for review. The implementation
status of a blueprint for a given release can be found by looking at the
blueprint in launchpad. Not all approved blueprints will get fully implemented.
Specifications have to be re-proposed for every release. The review may be
quick, but even if something was previously approved, it should be re-reviewed
to make sure it still makes sense as written.
Prior to the Juno development cycle, this repository was not used for spec
reviews. However, backporting proposals to Icehouse may be made here.
Please note, Launchpad blueprints are still used for tracking the
current status of blueprints. For more information, see::
https://wiki.openstack.org/wiki/Blueprints
For more information about working with gerrit, see::
https://wiki.openstack.org/wiki/Gerrit_Workflow

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..
This work is licensed under a Creative Commons Attribution 3.0 Unported
License.
http://creativecommons.org/licenses/by/3.0/legalcode
==========================================
Example Spec - The title of your blueprint
==========================================
Include the URL of your launchpad blueprint:
https://blueprints.launchpad.net/puppet-[projectname]/+spec/example
Introduction paragraph -- why are we doing anything? A single paragraph of
prose that operators can understand.
Some notes about using this template:
* Your spec should be in ReSTructured text, like this template.
* Please wrap text at 79 columns.
* The filename in the git repository should match the launchpad URL, for
example a URL of: https://blueprints.launchpad.net/nova/+spec/awesome-thing
should be named awesome-thing.rst
* Please do not delete any of the sections in this template. If you have
nothing to say for a whole section, just write: None
* For help with syntax, see http://sphinx-doc.org/rest.html
* To test out your formatting, build the docs using tox, or see:
http://rst.ninjs.org
* If you would like to provide a diagram with your spec, ascii diagrams are
required. http://asciiflow.com/ is a very nice tool to assist with making
ascii diagrams. The reason for this is that the tool used to review specs is
based purely on plain text. Plain text will allow review to proceed without
having to look at additional files which can not be viewed in gerrit. It
will also allow inline feedback on the diagram itself.
Problem description
===================
A detailed description of the problem:
* For a new feature this might be use cases. Ensure you are clear about the
actors in each use case: End User vs Deployer
* For a major reworking of something existing it would describe the
problems in that feature that are being addressed.
Proposed change
===============
Here is where you cover the change you propose to make in detail. How do you
propose to solve this problem?
If this is one part of a larger effort make it clear where this piece ends. In
other words, what's the scope of this effort?
Alternatives
------------
What other ways could we do this thing? Why aren't we using those? This doesn't
have to be a full literature review, but it should demonstrate that thought has
been put into why the proposed solution is an appropriate one.
Data model impact
-----------------
Changes which require modifications to the data model often have a wider impact
on the system. The community often has strong opinions on how the data model
should be evolved, from both a functional and performance perspective. It is
therefore important to capture and gain agreement as early as possible on any
proposed changes to the data model.
Questions which need to be addressed by this section include:
* What new data objects and/or database schema changes is this going to
require?
* What database migrations will accompany this change.
* How will the initial set of new data objects be generated, for example if you
need to take into account existing instances, or modify other existing data
describe how that will work.
Module API impact
-----------------
Each API method which is either added or changed should have the following,
depending upon if it is a new class or an addition to an existing class.
* For new classes:
* Specification for the class.
* A description of what the class does suitable for use in
user documentation.
* Documentation of all parameters, including default values.
* For new parameters:
* Documentation, including parameters.
* Reason for addition (rather than using config classes).
* For deprecations:
* Reason for deprecation.
* Alternative to deprecated parameters.
* Scheduled release for deprecated parameter removal.
* Example use case including typical API samples.
* Discuss any policy changes, and discuss what things a deployer needs to
think about when defining their policy.
Note that the schema should be defined as restrictively as
possible. Parameters which are required should be marked as such and
only under exceptional circumstances should additional parameters
which are not defined in the schema be permitted .
End user impact
---------------------
Aside from the API, are there other ways a user will interact with this
feature?
* Does this change have an impact on python-novaclient? What does the user
interface there look like?
Performance Impact
------------------
Describe any potential performance impact on the system, for example
how often will new code be called, and is there a major change to the calling
pattern of existing code.
Examples of things to consider here include:
* A periodic task might look like a small addition but if it calls conductor or
another service the load is multiplied by the number of nodes in the system.
* Scheduler filters get called once per host for every instance being created,
so any latency they introduce is linear with the size of the system.
* A small change in a utility function or a commonly used decorator can have a
large impacts on performance.
* Calls which result in a database queries (whether direct or via conductor)
can have a profound impact on performance when called in critical sections of
the code.
* Will the change include any locking, and if so what considerations are there
on holding the lock?
Deployer impact
---------------------
Discuss things that will affect how you deploy and configure OpenStack
that have not already been mentioned, such as:
* What config options are being added? Should they be more generic than
proposed (for example a flag that other hypervisor drivers might want to
implement as well)? Are the default values ones which will work well in
real deployments?
* Is this a change that takes immediate effect after its merged, or is it
something that has to be explicitly enabled?
* If this change is a new binary, how would it be deployed?
* Please state anything that those doing continuous deployment, or those
upgrading from the previous release, need to be aware of. Also describe
any plans to deprecate configuration values or features. For example, if we
change the directory name that instances are stored in, how do we handle
instance directories created before the change landed? Do we move them? Do
we have a special case in the code? Do we assume that the operator will
recreate all the instances in their cloud?
Developer impact
----------------
Discuss things that will affect other developers working on Puppet OpenStack,
such as.
Implementation
==============
Assignee(s)
-----------
Who is leading the writing of the code? Or is this a blueprint where you're
throwing it out there to see who picks it up?
If more than one person is working on the implementation, please designate the
primary author and contact.
Primary assignee:
<launchpad-id or None>
Other contributors:
<launchpad-id or None>
Work Items
----------
Work items or tasks -- break the feature up into the things that need to be
done to implement it. Those parts might end up being done by different people,
but we're mostly trying to understand the timeline for implementation.
Dependencies
============
* Include specific references to specs and/or blueprints in nova, or in other
projects, that this one either depends on or is related to.
* If this requires functionality of another project that is not currently used
by Nova (such as the glance v2 API when we previously only required v1),
document that fact.
* Does this feature require any new library dependencies or code otherwise not
included in OpenStack? Or does it depend on a specific version of library?
Testing
=======
Please discuss how the change will be tested. We especially want to know what
tempest tests will be added. It is assumed that unit test coverage will be
added so that doesn't need to be mentioned explicitly, but discussion of why
you think unit tests are sufficient and we don't need to add more tempest
tests would need to be included.
Is this untestable in gate given current limitations (specific hardware /
software configurations available)? If so, are there mitigation plans (3rd
party testing, gate enhancements, etc).
Documentation Impact
====================
What is the impact on the docs team of this change? Some changes might require
donating resources to the docs team to have the documentation updated. Don't
repeat details discussed above, but please reference them here.
References
==========
Please add any useful references here. You are not required to have any
reference. Moreover, this specification should still make sense when your
references are unavailable. Examples of what you could include are:
* Links to mailing list or IRC discussions
* Links to notes from a summit session
* Links to relevant research, if appropriate
* Related specifications as appropriate (e.g. if it's an EC2 thing, link the
EC2 docs)
* Anything else you feel it is worthwhile to refer to