openstack/watcher
Code Issues Proposed changes

Provide detailed information on architecture

Browse Source 
Added new global architecture diagram using Dia tool
and a more detailed description of each component.
Exported this diagram in SVG format.
The source code of the diagram is stored in
/doc/images_src/ folder.
Moved also the architecture.rst file from the /dev
folder to the root folder of the Watcher doc.

Change-Id: I74379390178673dcb6a043967b31e38ca9560bb3
This commit is contained in:
vmahe 2015-11-25 16:57:50 +01:00
parent 5e8c1af665
commit 7710b1670e
5 changed files with 446 additions and 10 deletions
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.. _architecture:
===================
System Architecture
===================
This page presents the current technical Architecture of the Watcher system.
.. _architecture_overview:
Overview
========
Below you will find a diagram, showing the main components of Watcher:
.. image:: ./images/architecture.svg
:width: 100%
.. _components_definition:
Components
==========
.. _amqp_bus_definition:
AMQP Bus
--------
The AMQP message bus handles asynchronous communications between the different
Watcher components.
.. _cluster_history_db_definition:
Cluster History Database
------------------------
This component stores the data related to the
:ref:`Cluster History <cluster_history_definition>`.
It can potentially rely on any appropriate storage system (InfluxDB, OpenTSDB,
MongoDB,...) but will probably be more performant when using
`Time Series Databases <https://en.wikipedia.org/wiki/Time_series_database>`_
which are optimized for handling time series data, which are arrays of numbers
indexed by time (a datetime or a datetime range).
.. _watcher_api_definition:
Watcher API
-----------
This component implements the REST API provided by the Watcher system to the
external world.
It enables the :ref:`Administrator <administrator_definition>` of a
:ref:`Cluster <cluster_definition>` to control and monitor the Watcher system
via any interaction mechanism connected to this API:
- :ref:`CLI <watcher_cli_definition>`
- Horizon plugin
- Python SDK
You can also read the detailed description of `Watcher API`_.
.. _watcher_applier_definition:
Watcher Applier
---------------
This component is in charge of executing the :ref:`Action Plan <action_plan_definition>`
built by the :ref:`Watcher Decision Engine <watcher_decision_engine_definition>`.
It connects to the :ref:`message bus <amqp_bus_definition>` and launches the
:ref:`Action Plan <action_plan_definition>` whenever a triggering message is
received on a dedicated AMQP queue.
The triggering message contains the Action Plan UUID.
It then gets the detailed information about the
:ref:`Action Plan <action_plan_definition>` from the
:ref:`Watcher Database <watcher_database_definition>` which contains the list
of :ref:`Actions <action_definition>` to launch.
It then loops on each :ref:`Action <action_definition>`, gets the associated
class and calls the execute() method of this class.
Most of the time, this method will first request a token to the Keystone API
and if it is allowed, sends a request to the REST API of the OpenStack service
which handles this kind of :ref:`atomic Action <action_definition>`.
Note that as soon as :ref:`Watcher Applier <watcher_applier_definition>` starts
handling a given :ref:`Action <action_definition>` from the list, a
notification message is sent on the :ref:`message bus <amqp_bus_definition>`
indicating that the state of the action has changed to **ONGOING**.
If the :ref:`Action <action_definition>` is successful, the :ref:`Watcher Applier <watcher_applier_definition>`
sends a notification message on :ref:`the bus <amqp_bus_definition>` informing
the other components of this.
If the :ref:`Action <action_definition>` fails, the
:ref:`Watcher Applier <watcher_applier_definition>` tries to rollback to the
previous state of the :ref:`Managed resource <managed_resource_definition>`
(i.e. before the command was sent to the underlying OpenStack service).
.. _watcher_cli_definition:
Watcher CLI
-----------
The watcher command-line interface (CLI) can be used to interact with the
Watcher system in order to control it or to know its current status.
Please, read `the detailed documentation about Watcher CLI <https://factory.b-com.com/www/watcher/doc/python-watcherclient/>`_
.. _watcher_database_definition:
Watcher Database
----------------
This database stores all the Watcher domain objects which can be requested
by the :ref:`Watcher API <watcher_api_definition>` or the
:ref:`Watcher CLI <watcher_cli_definition>`:
- :ref:`Audit templates <audit_template_definition>`
- :ref:`Audits <audit_definition>`
- :ref:`Action plans <action_plan_definition>`
- :ref:`Actions <action_definition>`
- :ref:`Goals <goal_definition>`
The Watcher domain being here "*optimization of some resources provided by an
OpenStack system*".
.. _watcher_decision_engine_definition:
Watcher Decision Engine
-----------------------
This component is responsible for computing a set of potential optimization
:ref:`Actions <action_definition>` in order to fulfill the :ref:`Goal <goal_definition>`
of an :ref:`Audit <audit_definition>`.
It first reads the parameters of the :ref:`Audit <audit_definition>` from the
associated :ref:`Audit Template <audit_template_definition>` and knows the
:ref:`Goal <goal_definition>` to achieve.
It then selects the most appropriate :ref:`Strategy <strategy_definition>`
depending on how Watcher was configured for this :ref:`Goal <goal_definition>`.
The :ref:`Strategy <strategy_definition>` is then dynamically loaded (via
`stevedore <https://github.com/openstack/stevedore/>`_). The
:ref:`Watcher Decision Engine <watcher_decision_engine_definition>` calls the
**execute()** method of the :ref:`Strategy <strategy_definition>` class which
generates a set of :ref:`Actions <action_definition>`.
These :ref:`Actions <action_definition>` are scheduled in time by the
:ref:`Watcher Planner <watcher_planner_definition>` (i.e., it generates an
:ref:`Action Plan <action_plan_definition>`).
In order to compute the potential :ref:`Solution <solution_definition>` for the
Audit, the :ref:`Strategy <strategy_definition>` relies on two sets of data:
- the current state of the :ref:`Managed resources <managed_resource_definition>`
(e.g., the data stored in the Nova database)
- the data stored in the :ref:`Cluster History Database <cluster_history_db_definition>`
which provides information about the past of the :ref:`Cluster <cluster_definition>`
So far, only one :ref:`Strategy <strategy_definition>` can be associated to a
given :ref:`Goal <goal_definition>` via the main Watcher configuration file.
.. _Watcher API: webapi/v1.html

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.. _architecture:
===================
System Architecture
===================
Please go to `Wiki Watcher Architecture <https://wiki.openstack.org/wiki/WatcherArchitecture>`_
.. _API service: ../webapi/v1.html

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doc/source/index.rst
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@ -22,7 +22,7 @@ Introduction
:maxdepth: 1
dev/glossary
dev/architecture
architecture
dev/environment
dev/contributing
dev/plugins