Provide detailed information on architecture
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
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.. _architecture:
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===================
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System Architecture
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===================
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This page presents the current technical Architecture of the Watcher system.
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.. _architecture_overview:
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Overview
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========
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Below you will find a diagram, showing the main components of Watcher:
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.. image:: ./images/architecture.svg
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:width: 100%
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.. _components_definition:
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Components
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==========
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.. _amqp_bus_definition:
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AMQP Bus
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--------
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The AMQP message bus handles asynchronous communications between the different
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Watcher components.
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.. _cluster_history_db_definition:
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Cluster History Database
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------------------------
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This component stores the data related to the
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:ref:`Cluster History <cluster_history_definition>`.
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It can potentially rely on any appropriate storage system (InfluxDB, OpenTSDB,
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MongoDB,...) but will probably be more performant when using
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`Time Series Databases <https://en.wikipedia.org/wiki/Time_series_database>`_
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which are optimized for handling time series data, which are arrays of numbers
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indexed by time (a datetime or a datetime range).
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.. _watcher_api_definition:
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Watcher API
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-----------
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This component implements the REST API provided by the Watcher system to the
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external world.
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It enables the :ref:`Administrator <administrator_definition>` of a
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:ref:`Cluster <cluster_definition>` to control and monitor the Watcher system
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via any interaction mechanism connected to this API:
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- :ref:`CLI <watcher_cli_definition>`
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- Horizon plugin
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- Python SDK
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You can also read the detailed description of `Watcher API`_.
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.. _watcher_applier_definition:
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Watcher Applier
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---------------
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This component is in charge of executing the :ref:`Action Plan <action_plan_definition>`
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built by the :ref:`Watcher Decision Engine <watcher_decision_engine_definition>`.
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It connects to the :ref:`message bus <amqp_bus_definition>` and launches the
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:ref:`Action Plan <action_plan_definition>` whenever a triggering message is
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received on a dedicated AMQP queue.
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The triggering message contains the Action Plan UUID.
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It then gets the detailed information about the
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:ref:`Action Plan <action_plan_definition>` from the
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:ref:`Watcher Database <watcher_database_definition>` which contains the list
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of :ref:`Actions <action_definition>` to launch.
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It then loops on each :ref:`Action <action_definition>`, gets the associated
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class and calls the execute() method of this class.
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Most of the time, this method will first request a token to the Keystone API
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and if it is allowed, sends a request to the REST API of the OpenStack service
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which handles this kind of :ref:`atomic Action <action_definition>`.
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Note that as soon as :ref:`Watcher Applier <watcher_applier_definition>` starts
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handling a given :ref:`Action <action_definition>` from the list, a
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notification message is sent on the :ref:`message bus <amqp_bus_definition>`
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indicating that the state of the action has changed to **ONGOING**.
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If the :ref:`Action <action_definition>` is successful, the :ref:`Watcher Applier <watcher_applier_definition>`
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sends a notification message on :ref:`the bus <amqp_bus_definition>` informing
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the other components of this.
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If the :ref:`Action <action_definition>` fails, the
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:ref:`Watcher Applier <watcher_applier_definition>` tries to rollback to the
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previous state of the :ref:`Managed resource <managed_resource_definition>`
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(i.e. before the command was sent to the underlying OpenStack service).
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.. _watcher_cli_definition:
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Watcher CLI
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-----------
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The watcher command-line interface (CLI) can be used to interact with the
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Watcher system in order to control it or to know its current status.
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Please, read `the detailed documentation about Watcher CLI <https://factory.b-com.com/www/watcher/doc/python-watcherclient/>`_
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.. _watcher_database_definition:
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Watcher Database
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----------------
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This database stores all the Watcher domain objects which can be requested
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by the :ref:`Watcher API <watcher_api_definition>` or the
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:ref:`Watcher CLI <watcher_cli_definition>`:
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- :ref:`Audit templates <audit_template_definition>`
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- :ref:`Audits <audit_definition>`
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- :ref:`Action plans <action_plan_definition>`
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- :ref:`Actions <action_definition>`
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- :ref:`Goals <goal_definition>`
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The Watcher domain being here "*optimization of some resources provided by an
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OpenStack system*".
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.. _watcher_decision_engine_definition:
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Watcher Decision Engine
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-----------------------
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This component is responsible for computing a set of potential optimization
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:ref:`Actions <action_definition>` in order to fulfill the :ref:`Goal <goal_definition>`
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of an :ref:`Audit <audit_definition>`.
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It first reads the parameters of the :ref:`Audit <audit_definition>` from the
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associated :ref:`Audit Template <audit_template_definition>` and knows the
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:ref:`Goal <goal_definition>` to achieve.
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It then selects the most appropriate :ref:`Strategy <strategy_definition>`
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depending on how Watcher was configured for this :ref:`Goal <goal_definition>`.
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The :ref:`Strategy <strategy_definition>` is then dynamically loaded (via
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`stevedore <https://github.com/openstack/stevedore/>`_). The
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:ref:`Watcher Decision Engine <watcher_decision_engine_definition>` calls the
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**execute()** method of the :ref:`Strategy <strategy_definition>` class which
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generates a set of :ref:`Actions <action_definition>`.
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These :ref:`Actions <action_definition>` are scheduled in time by the
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:ref:`Watcher Planner <watcher_planner_definition>` (i.e., it generates an
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:ref:`Action Plan <action_plan_definition>`).
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In order to compute the potential :ref:`Solution <solution_definition>` for the
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Audit, the :ref:`Strategy <strategy_definition>` relies on two sets of data:
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- the current state of the :ref:`Managed resources <managed_resource_definition>`
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(e.g., the data stored in the Nova database)
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- the data stored in the :ref:`Cluster History Database <cluster_history_db_definition>`
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which provides information about the past of the :ref:`Cluster <cluster_definition>`
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So far, only one :ref:`Strategy <strategy_definition>` can be associated to a
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given :ref:`Goal <goal_definition>` via the main Watcher configuration file.
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.. _Watcher API: webapi/v1.html
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@ -1,9 +0,0 @@
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.. _architecture:
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===================
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System Architecture
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===================
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Please go to `Wiki Watcher Architecture <https://wiki.openstack.org/wiki/WatcherArchitecture>`_
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.. _API service: ../webapi/v1.html
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After Width: | Height: | Size: 24 KiB |
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@ -22,7 +22,7 @@ Introduction
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:maxdepth: 1
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||||
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||||
dev/glossary
|
||||
dev/architecture
|
||||
architecture
|
||||
dev/environment
|
||||
dev/contributing
|
||||
dev/plugins
|
||||
|
|
|
|||
Loading…
Reference in New Issue