Hi Team, I’m trying Prefect following the guide do...
# ask-communitya
Alfie
06/27/2020, 2:31 AMHi Team, I’m trying Prefect following the guide doc, and found that there is a few seconds latency between triggering a flow to run via CLI “prefect run server --name hello-flow” and the agent runs the flow. Is that expected? Thanks.
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Chris White
06/27/2020, 2:32 AM
Hi Alfie - yup that’s expected; the agent polls on a backoff so if it’s not finding work it will sleep for up to 10 seconds before polling again
Chris White
06/27/2020, 2:33 AM
also, depending on the type of agent and the execution environment, the infrastructure setup for your flow could take a little while as well (e.g., a k8s agent running a flow with a DaskKubernetes Environment could add some additional latency)
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Alfie
06/27/2020, 2:37 AMthanks Chris. I need a scheduled flow, and want it to run at exact 0 min 0 second of every hour, is it possible to make it happen?
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Chris White
06/27/2020, 2:37 AM
is it OK if the flow starts a few seconds early?
Chris White
06/27/2020, 2:38 AM
actually yes I know how to achieve this
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Alfie
06/27/2020, 2:39 AMNo. I need to use the start time for querying a db. Maybe another way is to pass the time as a parameter
Alfie
06/27/2020, 2:39 AMwhat’s the way?
c
Chris White
06/27/2020, 2:39 AM
before I jump there, it sounds like you just need to use the
scheduled_start_timeChris White
06/27/2020, 2:40 AM
you can access
prefect.context.scheduled_start_timea
Alfie
06/27/2020, 2:41 AMthat sounds good, I can try that 🙂
Alfie
06/27/2020, 2:41 AMThanks
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Chris White
06/27/2020, 2:41 AM
awesome anytime - let us know if you run into any roadblocks!
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Alfie
06/27/2020, 2:42 AMcool, thanks!