azure function apps with timer: do they wait until the previous one is finished

Question

azure function apps with timer: do they wait until the previous one is finished

javier cohenar 211

I plan to deploy a function that is executed every 60 seconds. However I estimate the processing done by the function could take in some cases a bit more (say 80 seconds).

Since the processing might not be finished when the next function run should start I wonder whether the second run will wait until the first one finishes or it may be executed in parallel.

if the runs could overlap, how can I change the configuration of the function app in order to avoid this situation without changing the trigger being executed every 60secs?

Dillon Silzer 57,826 Reputation points Volunteer Moderator

2023-07-13T02:09:16.9666667+00:00

Are you saying you trigger the next function at the end of another?
javier cohenar 211 Reputation points

2023-07-13T03:07:18.5833333+00:00

same function that gets triggered every 60 secs. Average processing time is like 20 secs but sometimes it might be up to 80-90 secs. I'm wondering whether there will be an overlap while processing (which I need to avoid) or two function runs will run sequentially.

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Dillon Silzer 57,826 Reputation points Volunteer Moderator

2023-07-13T02:09:16.9666667+00:00

Are you saying you trigger the next function at the end of another?
javier cohenar 211 Reputation points

2023-07-13T03:07:18.5833333+00:00

same function that gets triggered every 60 secs. Average processing time is like 20 secs but sometimes it might be up to 80-90 secs. I'm wondering whether there will be an overlap while processing (which I need to avoid) or two function runs will run sequentially.

Answer 1

Sander van de Velde | MVP 36,761 MVP Volunteer Moderator

Hello

having multiple timer triggers can result in unpredictable behavior when the execution time exceeds the interval.

See this blog post with a more elaborate background story.

I suggest working with a single time triggered Azure function which distributes takes to be picked up by other functions.

If the response helped, do "Accept Answer". If it doesn't work, please let us know the progress. All community members with similar issues will benefit by doing so. Your contribution is highly appreciated.

javier cohenar 211 Reputation points

2023-07-13T12:21:23.25+00:00

Thank you @Sander van de Velde The blog post answers my question in the section named "What if the execution time exceeds the interval?".

From this, my understanding is that the function does not get triggered again until the previous run is finished and that works perfectly for my use case.
MayankBargali-MSFT 70,936 Reputation points Moderator

2023-07-17T12:00:25.4266667+00:00

@javier cohenar Yes your understanding is correct.

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azure function apps with timer: do they wait until the previous one is finished

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