Hi I m trying to get the next scheduled retry task through p Prefect Community #ask-community

Hi, I'm trying to get the next scheduled retry tas...

James Watt

08/20/2019, 3:03 AM

Hi, I'm trying to get the next scheduled retry task through prefect.context.scheduled_start_time. I expected it would be something like shown in the INFO log. e.g. "[2019-08-20 015921,499] INFO - prefect.Flow | Waiting for next available Task run at 2019-08-20T015931.428285+00:00". Obviously, herein the retry task is scheduled to run in 10 seconds later. However, prefect.context.scheduled_start_time just gave me a now() time. How can I get the time info regarding when the next retry takes place?

Jeremiah

08/20/2019, 3:13 AM

Hi James, additional information about scheduled states is generally only available when Prefect is backed by a database + API like Prefect Cloud. When calling

flow.run()

in Core, we’re running a “lite” in-process scheduler, but it doesn’t have access to all the details of the scheduled states. Therefore context fields like

scheduled_start_time

fall back to their default values (

now()

Jeremiah

08/20/2019, 3:14 AM

However,

scheduled_start_time

sounds like it might not be what you’re interested in.

scheduled_start_time

tells you what time the current run was supposed to start (for example, if it was scheduled for 9:00am, but actually starts at 90001,

scheduled_start_time=9:00

but

start_time=9:00:01

). Sounds like you’re looking for information about the next (future) run?

Jeremiah

08/20/2019, 3:15 AM

For that you’ll need to introspect the states that result from running your flow, and see if any of them are scheduled. (

[state for state in run_states if state.is_scheduled() ]

). Scheduled states have a

start_time

attribute that tells you when they are eligible to run again

James Watt

08/20/2019, 3:51 AM

Thank you, Jeremiah. I'd look into that direction.

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