Automation Composition Management manages a number of states of various types to manage the lifecycle of compositions. Those states are described here. Please also see the ACM System Level Dialogues page to see the system dialogues that change states and how states interrelate in detail. Please also see ITU Recommendation X.731, which is reflected in the states of AC Element Instances.
Participant State
ACParticipant states are NOT managed by ACM but the state of a participant is recorded and supervised by ACM.
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@startuml
[*] --> ONLINE: Register
ONLINE --> ONLINE: Heartbeat
ONLINE --> OFFLINE: Timeout
OFFLINE --> ONLINE: Heartbeat
ONLINE --> [*]: Deregister
OFFLINE --> [*]: Deregister
@enduml |
Automation Composition Type State
The states that an Automation Composition Type can have are shown in the diagram below.
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@startuml
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The current ACM state machine works but it is incosistent in the way it handles error states or failed transitions. A composition and its elements can get "stuck" in transition states.
We need to
- Specify what the current state machine is for both compositions and elements and describe what the state machine for both should be
- Specify what the behaviour of the runtime and participants should be in each state
- Specify what the behaviour should be for the runtime and participants should be in transitions
Specifically we need to clarify:
- State of the composition elements
- State of the overall composition is derived from the composition element states
- Admin state/Running state
- When all the elements are fully up and configured, the go to state Passive, when all elements are in Passive, the full composition goes to Passive
- Error states: Are they parallel sates or part of the same state?
- There should “it didn’t work” states like “Passive-Error” or “Run_Error” (names to be decided later)
- Describe what the “Running” state means and what the participant should do in Passive->Running and Running->Passive transitions.
- Say a K8S service crashes, how do we feed that back? Running_Error. The state of the POD is only checked during startup. It is not periodically checked. There should be supervision.
State Machine for Automation Compositions
Current State Machine
- Composition in UNINITIALIZED state: all elements of a composition are in UNINITIALIZED state, all applications are not deployed and policy types are not deployed and not present in Api.
- User triggers to move the composition from UNINITIALIZED to PASSIVE: runtime-acm moves elements from UNINITIALIZED state to UNINITIALIZED_TO_PASSIVE.
- Element in UNINITIALIZED_TO_PASSIVE:
- participant-ks8: deploys applications
- participant-policy: creates policy types in Api and deploys them with Pap.
- participant-http: configures applications.
- Element in PASSIVE state:
- participant-ks8: applications are deployed.
- participant-policy: policy types are create in Api and deployed with Pap.
- participant-http: applications are configured.
- Composition in PASSIVE state: all elements are in PASSIVE state, all applications are deployed and configured.
- User triggers to move the composition from PASSIVE to UNINITIALIZED: runtime-acm moves elements from PASSIVE state to PASSIVE_TO_UNINITIALIZED.
- Element in UNINITIALIZED_TO_PASSIVE:
- participant-ks8: undeploys applications
- participant-policy: undeploys policy types with Pap and deletes them in Api.
- participant-http: do nothing
- Element in UNINITIALIZED state:
- participant-ks8: applications are undeployed.
- participant-policy: policy types are not deployed and not present in Api.
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@startuml
'https://plantuml.com/state-diagram
state UNINITIALIZED
state UNINITIALIZED_TO_PASSIVE
state PASSIVE_TO_UNINITIALIZED
state PASSIVE
[*] --> UNINITIALIZED
UNINITIALIZED --> UNINITIALIZED_TO_PASSIVE
PASSIVE_TO_UNINITIALIZED --> UNINITIALIZED
PASSIVE --> PASSIVE_TO_UNINITIALIZED
UNINITIALIZED_TO_PASSIVE --> PASSIVE
@enduml |
Proposed State Machine
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@startuml 'https://plantuml.com/state-diagram state UNINITIALIZED state UNINITIALIZED_TO_PASSIVE state PASSIVE_TO_UNINITIALIZED state PASSIVE state PASSIVE_TO_RUNNING state RUNNING_TO_PASSIVE state RUNNING state RUNNING_TO_PASSIVE_ERROR state PASSIVE_TO_RUNNING_ERROR state RUNNING state RUN_ERROR [*] --> UNINITIALIZED UNINITIALIZEDCOMMISSIONED: Commission COMMISSIONED --> UNINITIALIZED_TO_PASSIVE PASSIVE_TO_UNINITIALIZED [*]: Decommission COMMISSIONED --> PRIMING: UNINITIALIZED UNINITIALIZED_TO_PASSIVEPrime PRIMED --> PASSIVE PASSIVEPRIMING: Prime PRIMING --> PASSIVE_TO_RUNNING PASSIVE PRIMED: AC Element Types\nall PRIMED PRIMING --> PASSIVE_TO_UNINITIALIZED PASSIVE_TO_RUNNING DEPRIMING: Deprime PRIMED --> RUNNING PASSIVE_TO_RUNNINGDEPRIMING: Deprime DEPRIMING --> PASSIVE_TO_RUNNING_ERROR PASSIVE_TO_RUNNING_ERROR COMMISSIONED: AC Element Types\nall DEPRIMED @enduml |
Automation Composition Element Type State
The states that an Automation Composition Element Type can have on ACM Runtime are shown in the diagram below.
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@startuml [*] --> PASSIVE_TO_RUNNING RUNNING COMMISSIONED: Commission COMMISSIONED --> RUNNING_TO_PASSIVE RUNNING_TO_PASSIVE[*]: Decommission COMMISSIONED --> PRIMING: PASSIVE RUNNING_TO_PASSIVEPrime PRIMED --> RUNNING_TO_PASSIVE_ERROR RUNNINGPRIMING: Prime PRIMING --> RUN_ERROR RUN_ERROR PRIMED: AC Element Type Primed\nresponse from Participant PRIMING --> RUNNING RUN_ERRORDEPRIMING: Deprime PRIMED --> RUNNING_TO_PASSIVE RUNNING_TO_PASSIVE_ERRORDEPRIMING: Deprime DEPRIMING --> RUNNING_TO_PASSIVE COMMISSIONED: AC Element Type Deprimed\nresponse from Participant @enduml |
State Machine for Automation Composition Elements
Current State Machine
TBC
Proposed State Machine
The states that an Automation Composition Element Type can have on a Participant are shown in the diagram below.
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@startuml
[*] --> PRIMED: Prime from\nACM Runtime
PRIMED --> PRIMED: Prime from ACM Runtime
PRIMED --> [*]: Deprime from\nACM Runtime
@enduml |
Automation Composition Instance State
The states that an Automation Composition Instance can have are shown in the diagram below.
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@startuml |
PlantUML Macro |
@startuml 'https://plantuml.com/state-diagram state UNINITIALIZED state UNINITIALIZED_TO_PASSIVE state PASSIVE_TO_UNINITIALIZED state PASSIVE state PASSIVE_TO_RUNNING state RUNNING_TO_PASSIVE state RUNNING state RUNNING_TO_PASSIVE_ERROR state PASSIVE_TO_RUNNING_ERROR state RUNNING state RUN_ERROR [*] --> UNDEPLOYED: UNINITIALIZEDCreate UNINITIALIZEDUNDEPLOYED --> UNINITIALIZED_TO_PASSIVE PASSIVE_TO_UNINITIALIZED[*]: Delete UNDEPLOYED --> UNINITIALIZED UNINITIALIZED_TO_PASSIVEDEPLOYING: Deploy DEPLOYING --> PASSIVE PASSIVE DEPLOYED: AC Element Instances\nall DEPLOYED DEPLOYING --> PASSIVE_TO_RUNNING PASSIVEUNDEPLOYING: Undeploy DEPLOYED --> PASSIVE_TO_UNINITIALIZED PASSIVE_TO_RUNNINGUNDEPLOYING: Undeploy UNDEPLOYING --> RUNNING PASSIVE_TO_RUNNING --> PASSIVE_TO_RUNNING_ERROR PASSIVE_TO_RUNNING_ERRORUNDEPLOYED: AC Element Instances\nall UNDEPLOYED state DEPLOYED { [*] --> PASSIVE_TO_RUNNING RUNNINGLOCKED: Deploy LOCKED --> RUNNING_TO_PASSIVE RUNNING_TO_PASSIVE[*]: Undeploy LOCKED --> UNLOCKING: PASSIVE RUNNING_TO_PASSIVEUnlock UNLOCKING --> RUNNING_TO_PASSIVE_ERROR RUNNINGUNLOCKED: AC Element Instances\nall UNLOCKED UNLOCKED --> RUN_ERROR RUN_ERRORLOCKING: Lock UNLOCKING --> RUNNING RUN_ERRORLOCKING: Lock LOCKING --> RUNNING_TO_PASSIVE RUNNING_TO_PASSIVE_ERROR --> RUNNING_TO_PASSIVE LOCKED: AC Element Instances\nall LOCKED } @enduml |
Proposed State Machine
- Composition in UNINITIALIZED state: all elements of a the composition are in UNINITIALIZED state, all applications are not deployed and policy types are not deployed and not present in Api.
- User triggers to move the composition from UNINITIALIZED to PASSIVE: runtime-acm moves elements from UNINITIALIZED state to UNINITIALIZED_TO_PASSIVE.
- Element in UNINITIALIZED_TO_PASSIVE:
- participant-ks8: deploys applications
- participant-policy: creates policy types in Api and deploys them with Pap.
- participant-http: do nothing.
- Element in UNINITIALIZED_TO_PASSIVE_ERROR state: participant got error during deploy.
- Composition in UNINITIALIZED_TO_PASSIVE_ERROR state: at least one element is in UNINITIALIZED_TO_PASSIVE_ERROR state.
- Element in PASSIVE state:
- participant-ks8: applications are deployed.
- participant-policy: policy types are create in Api and deployed with Pap.
- participant-http: applications are not configured yet.
- Composition in PASSIVE state: all elements are moved to PASSIVE, all applications are deployed but not configured.
- User triggers to move the composition from PASSIVE to RUNNING: runtime-ACM moves elements from PASSIVE state to PASSIVE_TO_RUNNING.
- Element in PASSIVE_TO_RUNNING state:
- participant-ks8: do nothing (maybe checks if applications are running).
- participant-policy: do nothing (maybe checks if policy types are running).
- participant-http: configures applications.
- Element in PASSIVE_TO_RUNNING_ERROR state: participant got error during configuration.
- Composition in PASSIVE_TO_RUNNING_ERROR state: at least one element is in PASSIVE_TO_RUNNING_ERROR state.
- Element in RUNNING state:
- participant-ks8: applications are deployed (periodically checks if applications are running).
- participant-policy: policy types are create in Api and deployed with Pap.
- participant-http: applications are configured.
- Composition in RUNNING state: all elements of a ACM are in RUNNING state, all applications are running.
- Element in RUN_ERROR state: participant got error during running state (it periodically checks if applications are running).
- Composition in RUN_ERROR state: at least one element is in RUN_ERROR state
- User could decide to move the composition from RUN_ERROR to PASSIVE state.
- Application has been restarted by kubernetes, Participant detects that the application is running and move the element from RUN_ERROR to RUNNING.
- User triggers to move the composition from RUNNING to PASSIVE: runtime-acm moves elements from RUNNING state to RUNNING_TO_PASSIVE.
- Element in RUNNING_TO_PASSIVE:
- participant-ks8: do nothing
- participant-policy: do nothing
- participant-http: remove configuration
- Element in RUNNING_TO_PASSIVE_ERROR state: participant got error during removing configuration
- Composition in RUNNING_TO_PASSIVE_ERROR state: at least one element is in RUNNING_TO_PASSIVE_ERROR state.
- User triggers to move the composition from PASSIVE state to UNINITIALIZED: runtime-acm moves elements from PASSIVE state to PASSIVE_TO_UNINITIALIZED.
- Element in PASSIVE_TO_UNINITIALIZED:
- participant-ks8: undeploys applications
- participant-policy: undeploys policy types with Pap and deletes them in Api.
- participant-http: do nothing
- Element in PASSIVE_TO_UNINITIALIZED_ERROR state: participant got error during undeployment
- Composition in PASSIVE_TO_UNINITIALIZED_ERROR state: at least one element is in PASSIVE_TO_UNINITIALIZED_ERROR state.
- Element in UNINITIALIZED state:
- participant-ks8: applications are undeployed.
- participant-policy: policy types are not deployed and not present in Api.
- In any Error status the User can re-try the operation.
Note:
Whit this solution, User can move from RUNNING to PASSIVE, update the service template related to the configuration (participant-http) when applications are still up, and after move from PASSIVE to RUNNING.
Automation Composition Element Instance State
The states that an Automation Composition Element Instance can have on ACM Runtime are shown in the diagram below.
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@startuml
[*] --> UNDEPLOYED: Create
UNDEPLOYED --> [*]: Delete
UNDEPLOYED --> DEPLOYING: Deploy
DEPLOYING --> DEPLOYED: AC Element\nInstance DEPLOYED
DEPLOYING --> UNDEPLOYING: Undeploy
DEPLOYED --> UNDEPLOYING: Undeploy
UNDEPLOYING --> UNDEPLOYED: AC Element\nInstance UNDEPLOYED
state DEPLOYED {
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PlantUML Macro |
@startuml 'https://plantuml.com/state-diagram state UNINITIALIZED state UNINITIALIZED_TO_PASSIVE state PASSIVE_TO_UNINITIALIZED state PASSIVE state UNINITIALIZED_TO_PASSIVE_ERROR state PASSIVE_TO_UNINITIALIZED_ERROR state PASSIVE_TO_RUNNING state RUNNING_TO_PASSIVE state RUNNING state RUNNING_TO_PASSIVE_ERROR state PASSIVE_TO_RUNNING_ERROR state RUNNING state RUN_ERROR [*] --> UNINITIALIZED UNINITIALIZEDLOCKED: Deploy LOCKED --> UNINITIALIZED_TO_PASSIVE PASSIVE_TO_UNINITIALIZED [*]: Undeploy LOCKED --> UNINITIALIZED PASSIVE_TO_UNINITIALIZEDUNLOCKING: Unlock UNLOCKING --> PASSIVE_TO_UNINITIALIZED_ERROR PASSIVE_TO_UNINITIALIZED_ERRORUNLOCKED: AC Element\nInstance UNLOCKED UNLOCKED --> PASSIVE_TO_UNINITIALIZED UNINITIALIZED_TO_PASSIVELOCKING: Lock UNLOCKING --> PASSIVE UNINITIALIZED_TO_PASSIVELOCKING: Lock LOCKING --> UNINITIALIZED_TO_PASSIVE_ERROR UNINITIALIZED_TO_PASSIVE_ERROR LOCKED: AC Element\nInstance LOCKED } @enduml |
The states that an Automation Composition Element Instance can have on a Participant are shown in the diagram below.
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@startuml [*] --> UNINITIALIZED_TO_PASSIVE PASSIVEDEPLOYING: Deploy DEPLOYING --> PASSIVE_TO_RUNNING PASSIVE DEPLOYED: AC Element\nInstance DEPLOYED\nRespond with\nAC Element State Update DEPLOYING --> PASSIVE_TO_UNINITIALIZED PASSIVE_TO_RUNNINGUNDEPLOYING: Undeploy DEPLOYING --> RUNNING PASSIVE_TO_RUNNING [*]: Deploy Failed\nRespond with\nAC Element State Update DEPLOYED --> PASSIVE_TO_RUNNING_ERROR PASSIVE_TO_RUNNING_ERRORUNDEPLOYING: Undeploy UNDEPLOYING --> PASSIVE_TO_RUNNING RUNNING [*]: Undeployed\nRespond with\nAC Element State Update state DEPLOYED { [*] --> RUNNING_TO_PASSIVE RUNNING_TO_PASSIVELOCKED LOCKED --> PASSIVE RUNNING_TO_PASSIVE[*] LOCKED --> RUNNING_TO_PASSIVE_ERROR RUNNING UNLOCKING: Unlock UNLOCKING --> RUN_ERROR RUN_ERRORUNLOCKED: AC Element\nInstance UNLOCKED UNLOCKED --> RUNNING RUN_ERRORLOCKING: Lock UNLOCKING --> RUNNING_TO_PASSIVE RUNNING_TO_PASSIVE_ERRORLOCKING: Lock LOCKING --> RUNNING_TO_PASSIVE LOCKED: AC Element\nInstance LOCKED } @enduml |