Azure Function Python V2 Timer Trigger Not Executing

Question

I'm having trouble setting up Azure Function Python v2 for timer trigger.

I have the following decorator with %Schedule% set to 0 0 23 * * 2 which should be 11PM UTC time.

@app.timer_trigger(schedule="%Schedule%", arg_name="myTimer", run_on_startup=False, use_monitor=False)	

However, it never triggers.

Also I'm on Flex Consumption plan if that matters.

Can anyone help please?

Answer 1

It seems you are experiencing issues with your Azure Function's timer trigger not executing as expected. Here are a few things to check:

1. Schedule Format: Ensure that the CRON expression you are using (0 0 23 * * 2) is correct and aligns with the expected format for Azure Functions. This expression should trigger at 11 PM UTC on Tuesdays.
2. Function App Configuration: Make sure that your function app is properly configured to use the v2 programming model. The Python v2 programming model is only supported in the 4.x functions runtime, so ensure that your function app is running on the correct version.
3. Monitoring: Since you have set use_monitor=False, consider setting it to True to enable monitoring of the schedule. This can help you diagnose if the function is being triggered but failing to execute properly.
4. Logs and Errors: Check the logs for any errors or warnings that might indicate why the timer trigger is not firing. Look for any issues related to the timer trigger in the Azure portal.
5. Run on Startup: If you want the function to trigger immediately when the function app starts, you can set run_on_startup=True. This will help you verify if the function is set up correctly.

If you've checked all of these and the issue persists, consider reviewing the troubleshooting documentation for Python functions in Azure Functions for additional insights.

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References:

• Troubleshoot Python errors in Azure Functions (python-mode-decorators)
• Blueprint Class

Answer 2

Hi william T,

Thanks for reaching out to Microsoft Q&A.

I faced the same issue when I tried to replicate the same initially.

Below steps worked for me:

• Created a new function app (Flex consumption plan).
• Deployed below python function to Azure:

import azure.functions as func
import datetime
import json
import logging

app = func.FunctionApp()

@app.timer_trigger(schedule="%Schedule%", arg_name="myTimer", run_on_startup=False,
              use_monitor=False) 
def timer_trigger(myTimer: func.TimerRequest) -> None:
    
    if myTimer.past_due:
        logging.info('The timer is past due!')

    logging.info('Python timer trigger function executed.')

Added Schedule App Setting under Environment Variables in function app.

The value should be the time converted to UTC.

Example: I have scheduled a trigger at 2:15 AM UTC. CRON expression 0 15 2 * * 3 used.

Able to trigger the function at scheduled time:

Hope it helps!

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