hello Has anyone ever had success with Prefect v1 in creatin

Question

hello Has anyone ever had success with Prefect v1 in creating a flow that dynamically creates a number of `StartFlowRun` tasks at runtime My scenario is that I want a flow call it `orchestratorFlow` to orchestrate the execution of several instances of another flow that I have call that one `ecsFlow` The issue at hand is I don t know how many instances of my `ecsFlow` I need to kick off until `orchestratorFlow` runtime it could be 1 8 or 50+ each flow run of `ecsFlow` would be run with a different set of parameters and would be determined based on a parameter passed to `orchestratorFlow` I ve tried to follow the Prefect v1 map paradigm by doing `StartFlowRun map lt config parameters gt ` where ` lt config parameters gt ` is a dynamically generated list of flow run kwargs returned by an upstream task but that s not doing the trick Thank you for any help

Matthew Scanlon · Answer

have you tried using `prefect tasks prefect create flow run`

James Sopkin · Answer

yes I have done this before What you can do is have your `orchestrator flow` iterate through the parameters kicking off a new child flow for each set of params using `create flow run` I can type up some pseudo code if that would help

James Sopkin · Answer

I think it would look something like this ```from prefect import Flow task Client unmapped task def generate params do something here return num 1 letter a num 2 letter b num 3 letter c with Flow orchestrator as flow params = generate params Client create flow run map flow id=unmapped flow id here params=params ```

Sean Talia · Answer

oh okay interesting it s actually unclear to me when you d want to use `create flow run` v `StartFlowRun` the documentation isn t particularly clarifying also does the different casing on these tasks signify anything

James Sopkin · Answer

I believe create flow run is an update on StartFlowRun

James Sopkin · Answer

What do you mean by the different casing

Sean Talia · Answer

just the fact that `StartFlowRun` is camel case and `create flow run` is snake case

James Sopkin · Answer

ahh

James Sopkin · Answer

I m not sure on the significance of this

Sean Talia · Answer

is snake case the new standard and `StartFlowRun` is just kept to preserve backwards compatibility

James Sopkin · Answer

I believe that is the case