Merge "Add feature_request mechanism"

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Jenkins 2014-08-26 09:31:02 +00:00 committed by Gerrit Code Review
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========================
Content of doc directory
========================
This directory contains everything that is related to documentation and
bureaucracy. You can find here 4 subdirectories:
feature_request
~~~~~~~~~~~~~~~
If some use case is not covered by Rally, it is the right place to request it.
To request new feature you should just explain use case on high level.
Technical details and writing code are not required at all.
samples
~~~~~~~
If you are looking for samples of deployments and benchmarks configuration
you are on the right way
source
~~~~~~
Source of documentation. Latest version of documentation_.
.. _documentation: http://rally.readthedocs.org/
user_stories
~~~~~~~~~~~~
Place where you can share any of Rally user experience. E.g. fixing some bugs,
measuring performance of different architectures or comparing different
hardware and so on..

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===============================================
Support benchmarking clouds that are using LDAP
===============================================
Use Case
--------
A lot of production clouds are using LDAP with read only access. It means
that load can be generated only by existing in system users and there is no admin access.
Problem Description
-------------------
Rally is using admin access to create temporary users that will be used to
produce load.
Possible Solution
-----------------
* Drop admin requirements
* Add way to pass already existing users

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================
Feature requests
================
To request a new feature you should create a document similar to other feature
requests. And contribute it to this directory using next instruction_.
If you don't have time to contribute via gerrit,
please contact Boris Pavlovic (boris@pavlovic.me)
.. _instruction: https://wiki.openstack.org/wiki/Rally/Develop#How_to_contribute

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=======================================
Ability to compare results between task
=======================================
Use case
--------
During the work on performance it's essential to be able to compare results of
similar task before and after change in system.
Problem description
-------------------
There is no command to compare two or more tasks and get tables and graphs.
Possible solution
-----------------
* Add command that accepts 2 tasks UUID and prints graphs that compares result

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===========================
Distributed load generation
===========================
Use Case
--------
Some OpenStack projects (Marconi, MagnetoDB) require a real huge load,
like 10-100k request per second for benchmarking.
To generate such huge load Rally have to create load from different
servers.
Problem Description
-------------------
* Rally can't generate load from different servers
* Result processing can't handle big amount of data
* There is no support for chunking results

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===========================
Historical performance data
===========================
Use case
--------
OpenStack is really rapidly developed. Hundreds patches are merged daily
and it's really hard to track how performance is changed during time.
It will be nice to have a way to track performance of major functionality
of OpenStack running periodically rally task and building graphs that represent
how performance of specific method is changed during the time.
Problem description
-------------------
There is no way to bind tasks
Possible solution
-----------------
* Add grouping for tasks
* Add command that creates historical graphs

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======================================
Using multi scenarios to generate load
======================================
Use Case
--------
Rally should be able to generate real life load. Simultaneously create load
on different components of OpenStack, e.g. simultaneously booting VM, uploading
image and listing users.
Problem Description
-------------------
At the moment Rally is able to run only 1 scenario per benchmark.
Scenario are quite specific (e.g. boot and delete VM for example) and can't
actually generate real life load.
Writing a lot of specific benchmark scenarios that will produce more real life
load will produce mess and a lot of duplication of code.
Possible solution
-----------------
* Extend Rally task benchmark configuration in such way to support passing
multiple benchmark scenarios in singe benchmark context
* Extend Rally task output format to support results of multiple scenarios in
single benchmark separately.
* Extend rally task plot2html and rally task detailed to show results
separately for every scenario.

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================================================
Add support of persistence benchmark environment
================================================
Use Case
--------
To benchmark many of operations like show, list, detailed you need to have
already these resource in cloud. So it will be nice to be able to create
benchmark environment once before benchmarking. The run some amount of
benchmarks that are using it and at the end just delete all created resources
by benchmark environment.
Problem Description
-------------------
Fortunately Rally has already a mechanism for creating benchmark environment,
that is used to create load. Unfortunately it's atomic operation:
(create environment, make load, delete environment).
This should be split to 3 separated steps.
Possible solution
-----------------
* Add new CLI operations to work with benchmark environment:
(show, create, delete, list)
* Allow task to start against benchmark environment (instead of deployment)

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========================
Production read cleanups
========================
Use Case
--------
Rally should delete in any case all resources that it created during benchmark.
Problem Description
-------------------
* Deletion rate limit
You can kill cloud by deleting too many objects simultaneously, so deletion
rate limit is required
* Retry on failures
There should be few attempts to delete resource in case of failures
* Disaster recovery
Rally should use special name patterns, to be able to delete resources
in such case if something went wrong with server that is running rally. And
you have just new instance (without old rally db) of rally on new server.

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============================
Content of samples directory
============================
deployments
~~~~~~~~~~~
Input configurations for "rally deployment" command
tasks
~~~~~
Input configurations for "rally task" command