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#prefect-server
Title
# prefect-server
b

Bruno Murino

07/06/2021, 8:45 AM
this is how I’m defining my clock, then I attach it to the flow by doing
flow.schedule = get_schedule()
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import datetime
from datetime import datetime, timedelta
from prefect.schedules import clocks, Schedule


def get_schedule():

    now = datetime.utcnow()

    clock1 = clocks.IntervalClock(
        interval=timedelta(minutes=10),
        parameter_defaults={
            "scope": "full",
        },
    )

    my_schedule = Schedule(
        clocks=[
            clock1,
        ]
    )

    return my_schedule
1
s

Stéphan Taljaard

07/06/2021, 9:28 AM
Is the schedule enabled in the UI?
b

Bruno Murino

07/06/2021, 9:28 AM
yes it is
s

Simon Gasse

07/06/2021, 9:45 AM
I have the exact same issue 💁‍♂️ The docs unfortunately did not help me resolve it. Really curious what it could be about 🤔
k

Kevin Kho

07/06/2021, 10:50 AM
How did you attach the schedule to the Flow?
s

Simon Gasse

07/06/2021, 11:04 AM
For me, I created a file
scheduled_hello.py
and ran
python scheduled_hello.py
on the machine where the server is running.
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from datetime import timedelta

from prefect import task, Flow
from prefect.schedules import IntervalSchedule


@task
def say_hello():
    print("Hello, world!")


schedule = IntervalSchedule(interval=timedelta(minutes=2))

with Flow("Scheduled Hello", schedule) as flow:
    say_hello()

flow.register(project_name='example',
              labels=['local'],
              idempotency_key=flow.serialized_hash())
Is there a difference when using
prefect register
instead? Edit: I tried with
prefect register
but it does not make a difference 🤔
k

Kevin Kho

07/06/2021, 11:16 AM
Can you try adding
flow.schedule = schedule
after the flow definition and before the
flow.register()
?
b

Bruno Murino

07/06/2021, 11:21 AM
@Kevin Kho On my code I do:
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if os.environ["EXECUTOR"] == "aws" and os.environ["ENV"] == "prod":
        flow.schedule = get_schedule()
k

Kevin Kho

07/06/2021, 11:24 AM
I think you schedule is not getting attached. Can you try attaching directly without this
if
block first? What do you see when you to go to the Flow Settings and click Schedule?
b

Bruno Murino

07/06/2021, 11:29 AM
I’ll try that now — but on the UI I do see the schedule there
s

Simon Gasse

07/06/2021, 11:30 AM
@Kevin Kho thank you for the input! Changing to:
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schedule = IntervalSchedule(interval=timedelta(minutes=2))

with Flow("Scheduled Hello") as flow:
    say_hello()

flow.schedule = schedule

flow.register(project_name='example',
              labels=['local'],
              idempotency_key=flow.serialized_hash())
unfortunately does not make a difference on my setup
I also see the schedule in the UI like you @Bruno Murino 👍 So I wonder if it is more an issue in the backend? Does some internal part of
prefect server
not go through the attached schedules to figure out what to run next?
k

Kevin Kho

07/06/2021, 11:32 AM
It should. What version are you on? Will try to replicate
b

Bruno Murino

07/06/2021, 11:35 AM
@Kevin Kho without the IF statement it still doesn’t work, the UI looks identical with the schedule listed but no upcoming runs ever.. I’m on prefect 15 throughout
k

Kevin Kho

07/06/2021, 11:39 AM
Ok trying to replicate
You guys are right. I see the same behavior on Prefect Server, and the same code works on Cloud. I’ll ask the team about it when they’re online and get back to you
🙏 1
s

Simon Gasse

07/06/2021, 12:10 PM
Oh alright! Thank you for reproducing and taking it up @Kevin Kho! 🙂 My version:
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$ pip show prefect
Name: prefect
Version: 0.15.0
BTW if you can 'upcast' this discussion to an issue, you already have it reported on GitHub: https://github.com/PrefectHQ/prefect/discussions/4740
k

Kevin Kho

07/06/2021, 6:26 PM
@Bruno Murino a fix has been provided in case you missed this
b

Bruno Murino

07/06/2021, 11:14 PM
Yes I saw! To use the “master” version of the images — do you how long until a proper 0.15.1 is released fixing this bug?
k

Kevin Kho

07/07/2021, 12:49 AM
1 week or 2 weeks from now minimum
s

Simon Gasse

07/07/2021, 6:56 AM
@Bruno Murino if you want to pin a version before, you can pin the docker images by their
sha256
in the `docker-compose.yml`:
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image: prefecthq/apollo@sha256:65ca4f0a4a667fd48360a5c00b4670a796dbc43f2e3a1a0e40ad8b40e1e5cd7f
    ...
    image: prefecthq/server@sha256:0490b527756a53bd3c80513cf09d8c51fdf002c7991524898f62fdd43a31a343
b

Bruno Murino

07/07/2021, 8:35 AM
@Simon Gasse This is very helpful, thanks for sharing it! It is indeed working now 🙂 Thanks everyone!
👍 1
a

Adam

07/08/2021, 11:18 AM
Late reply and I know its solved now, but could your issue just be args vs kwargs @Bruno Murino:
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schedule = IntervalSchedule(interval=timedelta(minutes=2))
with Flow("Scheduled Hello", schedule) as flow:
    say_hello()
We normally do:
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schedule = IntervalSchedule(interval=timedelta(minutes=2))
with Flow("Scheduled Hello", schedule=schedule) as flow:
    say_hello()
b

Bruno Murino

07/08/2021, 11:44 AM
I actually do it like “flow.schedule = schedule” and actually their bugfix solved my problem as well!
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