@Marvin If I use set_flow_run_state, what is the different in setting force to True or False is regards to orchestration logic?

The difference when setting the

force

parameter to

True

or

False

in

set_flow_run_state

influences how orchestration rules are applied: -

force=False

: When

force

is set to

False

, orchestration rules are observed. It means the state transition will follow Prefect's orchestration policies, ensuring that the state transition is valid as per the defined rules. -

force=True

: If

force

is set to

True

, it bypasses the orchestration rules. This option allows the user to manually push a state change, regardless of whether it conforms to the standard orchestration policies or not. Sources: - Prefect Workflow Engine - GitHub Issue on Manual Flow Retries In summary,

force=True

overrides orchestration rules, while

force=False

adheres to them.

@Marvin Can you give me an example of the orchestration rules or standard orchestration policies?

Orchestration rules in Prefect are designed to manage state transitions in a controlled manner. Here are some examples of such rules: 1. Scheduled Time Constraint: - A flow run will be rejected from entering the

Pending

state until its scheduled time is reached. This ensures that the flow does not start prematurely. 2. Concurrency Limits: - If there are limits on concurrent workflows, the orchestrator might block a flow from entering the

Running

state until those conditions are met. 3. Task Retry Logic: - When a task attempts to enter a

Failed

state, the orchestrator checks how many retries the task has remaining. If retries are available, the transition to

Failed

is rejected and the task is instructed to await retry. These rules are enforced by the orchestrator to ensure smooth and predictable workflow execution. Users can manually override these rules, but doing so (e.g., by setting

force=True

in

set_flow_run_state

) disregards the built-in safeguards and policies. For a deeper dive into orchestration rules of Prefect's Orion engine, you might want to read this article. Source: - Prefect Blog: Second-Generation Workflow Engine