Timer triggered Azure Function executes irregularly

Question

I have a timer triggered Azure Function whitch executes every morning at 04:30 AM

public static void Run([TimerTrigger("0 30 4 * * *")] TimerInfo myTimer)

Now I noticed that the invocation log shows me quite different execution times:

This function worked like a charm. Since one week I notice the below issues:

How can this be that there are executions 2 minutes before the defined time? And why there are executions up to 8 minutes (!!) after the defined time?

Another strange behaviour is that in a different environment I see that the exact same Azure Function is triggered multiple times within the same minute:

Could this be an issue with the display in the invocation log or does somebody know more about this strange effect?

Any hint is highly appreciated!

Frank Borzage · Accepted Answer · 2020-12-14 02:29:14Z

1

How can this be that there are executions 2 minutes before the defined time?

An error of about two minutes may be normal, which may be related to the design.

And why there are executions up to 8 minutes (!!) after the defined time?

Processing time depends on the code you write and the size of the data processed.

Another strange behaviour is that in a different environment I see that the exact same Azure Function is triggered multiple times within the same minute

Please check if runOnStartup is set to True. I think this is caused by multiple instances running at the same time. You can refer to this official documentation.

answered Dec 14, 2020 at 2:29

Frank Borzage

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Paul Richardson Over a year ago

Thank you for your inputs! Actually this behaviour has disappeared. I have no clue what happened. Maybe Microsoft was just doing some updates or similar. So I'll close this question

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