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@startuml
hide empty description

[*] -> Created
Created --> Waiting : Start scheduling
state "Waiting for resources" as Waiting
Waiting --> Waiting : Resources are not stable yet
Waiting --> Executing : Resources are stable
Waiting --> Finished : Cancel or suspend
Executing --> Canceling : Cancel
Executing --> Failing : Unrecoverable fault
Executing --> Finished : Suspend or job reached terminal state
Executing --> Restarting : Recoverable fault
Restarting --> Finished : Suspend
Restarting --> Canceling : Cancel
Restarting --> Waiting : Cancelation complete
Canceling --> Finished : Cancelation complete
Failing --> Finished : Failing complete
Finished -> [*]

@enduml

The states have the following semantics:

• Created: Initial state of the scheduler
• Waiting for resources: The required resources are declared. The scheduler waits until either the requirements are fulfilled or the set of resources has stabilised.
• Executing: The set of resources is stable and the scheduler could decide on the parallelism with which to execute the job. The ExecutionGraph is created and the execution of the job has started.
• Restarting: A recoverable fault has occurred. The scheduler stops the ExecutionGraph by canceling it.
• Canceling: The job has been canceled by the user. The scheduler stops the ExecutionGraph by canceling it.
• Failing: An unrecoverable fault has occurred. The scheduler stops the ExecutionGraph by canceling it.
• Finished: The job execution has been completed.

Components of the scheduler

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