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Updated DE architecture doc + 'period' param

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In this changeset, I updated the architecture documentation
about the Decision Engine by adding a new sequence diagram
outlining the CDM synchronization workflow.
I also explained the default 'period' parameter used in the
CDMC plugin.

Change-Id: I09790281ba9117e302ab8e66a887667929c6c261
Partially-Implements: blueprint cluster-model-objects-wrapper
This commit is contained in:
Vincent Françoise
2016-06-30 11:43:49 +02:00
parent 06c6c4691b
commit 4f8591cb02
8 changed files with 112 additions and 54 deletions
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41
doc/source/image_src/plantuml/sequence_architecture_cdmc_sync.txt Normal file
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@@ -0,0 +1,41 @@
@startuml
skinparam maxMessageSize 100
actor "Administrator"
== Initialization ==
"Administrator" -> "Decision Engine" : Start all services
"Decision Engine" -> "Background Task Scheduler" : Start
activate "Background Task Scheduler"
"Background Task Scheduler" -> "Cluster Model Collector Loader"\
: List available cluster data models
"Cluster Model Collector Loader" --> "Background Task Scheduler"\
: list of BaseClusterModelCollector instances
loop for every available cluster data model collector
"Background Task Scheduler" -> "Background Task Scheduler"\
: add periodic synchronization job
create "Jobs Pool"
"Background Task Scheduler" -> "Jobs Pool" : Create sync job
end
deactivate "Background Task Scheduler"
hnote over "Background Task Scheduler" : Idle
== Job workflow ==
"Background Task Scheduler" -> "Jobs Pool" : Trigger synchronization job
"Jobs Pool" -> "Nova Cluster Data Model Collector" : synchronize
activate "Nova Cluster Data Model Collector"
"Nova Cluster Data Model Collector" -> "Nova API"\
: Fetch needed data to build the cluster data model
"Nova API" --> "Nova Cluster Data Model Collector" : Needed data
"Nova Cluster Data Model Collector" -> "Nova Cluster Data Model Collector"\
: Build an in-memory cluster data model
]o<-- "Nova Cluster Data Model Collector" : Done
deactivate "Nova Cluster Data Model Collector"
@enduml

54
doc/source/image_src/plantuml/sequence_trigger_audit_in_decision_engine.txt
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@@ -10,45 +10,41 @@ activate "Decision Engine"
"AMQP Bus" <[#blue]- "Decision Engine" : notify new audit state = ONGOING
"Decision Engine" -> "Database" : get audit parameters (goal, strategy, ...)
"Decision Engine" <-- "Database" : audit parameters (goal, strategy, ...)
"Decision Engine" --> "Decision Engine": select appropriate \
optimization strategy (via the Strategy Selector)
"Decision Engine" --> "Decision Engine"\
: select appropriate optimization strategy (via the Strategy Selector)
create Strategy
"Decision Engine" -> "Strategy" : execute()
"Decision Engine" -> "Strategy" : execute strategy
activate "Strategy"
create "Cluster Data Model Collector"
"Strategy" -> "Cluster Data Model Collector" : get cluster data model
activate "Cluster Data Model Collector"
loop while enough data to build cluster data model
"Cluster Data Model Collector" -> "Nova API" : get resource state (\
host, instance, ...)
"Cluster Data Model Collector" <-- "Nova API" : resource state
"Strategy" -> "Cluster Data Model Collector" : get cluster data model
"Cluster Data Model Collector" --> "Strategy"\
: copy of the in-memory cluster data model
loop while enough history data for the strategy
"Strategy" -> "Ceilometer API" : get necessary metrics
"Strategy" <-- "Ceilometer API" : aggregated metrics
end
"Cluster Data Model Collector" -> "Strategy" : cluster data model
deactivate "Cluster Data Model Collector"
loop while enough history data for the strategy
"Strategy" -> "Ceilometer API": get necessary metrics
"Strategy" <-- "Ceilometer API": aggregated metrics
end
"Strategy" -> "Strategy" : compute/set needed actions for the solution \
so it achieves its goal
"Strategy" -> "Strategy" : compute/set efficacy indicators for the solution
"Strategy" -> "Strategy" : compute/set the solution global efficacy
"Decision Engine" <-- "Strategy" : solution (contains a list of unordered \
actions alongside its efficacy indicators as well as its global efficacy)
"Strategy" -> "Strategy"\
: compute/set needed actions for the solution so it achieves its goal
"Strategy" -> "Strategy" : compute/set efficacy indicators for the solution
"Strategy" -> "Strategy" : compute/set the solution global efficacy
"Decision Engine" <-- "Strategy"\
: solution (unordered actions, efficacy indicators and global efficacy)
deactivate "Strategy"
"Decision Engine" --> "Planner": load actions scheduler (i.e. Planner plugin)
create "Planner"
"Decision Engine" -> "Planner": schedule()
"Planner" -> "Planner": schedule actions according to \
scheduling rules/policies
"Decision Engine" <-- "Planner": new action plan
"Decision Engine" -> "Planner" : load actions scheduler
"Planner" --> "Decision Engine" : planner plugin
"Decision Engine" -> "Planner" : schedule actions
activate "Planner"
"Planner" -> "Planner"\
: schedule actions according to scheduling rules/policies
"Decision Engine" <-- "Planner" : new action plan
deactivate "Planner"
"Decision Engine" -> "Database" : save new action plan in database
"Decision Engine" -> "Database" : update audit.state = SUCCEEDED
"AMQP Bus" <[#blue]- "Decision Engine" : notify new audit state = SUCCEEDED
deactivate "Decision Engine"
hnote over "Decision Engine" : Idle
@enduml