Hey I want to make sure I understand <https docs metaflow or Outerbounds #ask-metaflow

Hey, I want to make sure I understand <this sectio...

calm-energy-71162

02/14/2023, 3:19 PM

Hey, I want to make sure I understand this section correctly: When I deploy a Flow as a StepFunction every

Parameter

of that flow that has a default will be evaluated at deploy time (not execution time) and all the runs for that step function will have the same value for that parameter. For example, if I have a parameter:

Copy code

datetime_run = Parameter(
        "datetime_run",
        default=datetime.now()
)

For all runs of that step function this parameter will have the same value (the time of when the step function was deployed, not the time it was executed). Correct?

✅ 1

square-wire-39606

02/14/2023, 4:15 PM

that's correct. if you would like to evaluate at run-time, you can compute the value within the start step.

calm-energy-71162

02/14/2023, 4:34 PM

Thanks for confirming, savin!

calm-energy-71162

02/14/2023, 4:39 PM

you can compute the value within the start step.

I guess in this scenario there is no way around having two attributes with different names as I cannot overwrite the Parameters? I am talking about a pattern like this:

Copy code

par_name_cli = Parameter(
        "par_name_cli",
        type=int,
    )

# in start step
self.par_name = self.par_name_cli if self.par_name_cli else computed_default

ancient-application-36103

02/14/2023, 4:56 PM

Yes - parameters are immutable but the example that you shared should work!

👍 1

2 Views

Open in Slack

Previous Next