Is it possible to execute Azure function Timer trigger with Sequential Execution?

Question

I want to execute Azure timer trigger with the sequential execution.

Suppose i have C# Timer trigger with 5min interval. But function takes time to execute is 8min. that means before completion of first call second trigger starts another thread. how can i avoid this?

alwayslearning · Accepted Answer · 2020-02-03T16:50:34.637

8

The defaut behavior is that at any given moment only one instance of your Azure function will be running. Quoting from the wiki -

If your function execution takes longer than the timer interval, another execution won't be triggered until after the current invocation completes. The next execution is scheduled after the current execution completes.

Here is the log output of test function that is scheduled to run every 30 seconds but takes 40 seconds itself to execute.

C# Timer trigger function triggered at: 8/4/2017 2:21:50 PM. C# Timer trigger function executed at: 8/4/2017 2:22:30 PM. Execution count 1

C# Timer trigger function triggered at: 8/4/2017 2:22:30 PM. C# Timer trigger function executed at: 8/4/2017 2:23:10 PM. Execution count 2

C# Timer trigger function triggered at: 8/4/2017 2:23:10 PM. C# Timer trigger function executed at: 8/4/2017 2:23:50 PM. Execution count 3

edited Feb 03 '20 at 16:50

answered Aug 04 '17 at 10:26

alwayslearning

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is this the Default behavior or it needs to be configured? – Avinash patil Aug 04 '17 at 11:31
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this is the default behavior. – alwayslearning Aug 04 '17 at 14:24
Can you mark this as an answer if you think it does indeed answer question? – alwayslearning Aug 05 '17 at 13:48
What about async function then ? – Shailendra Feb 03 '20 at 10:41

score 1 · Answer 2 · answered Aug 04 '17 at 09:39

You can set up time-triggered function to put a message into the queue and have another function (queue-triggered) run the processing for every message in the queue. It is possible to limit number of messages fetched from the queue, check here: Throttling Azure Storage Queue processing in Azure Function App However, triggering 8-minute processing every 5 minutes sounds like a serious problem. Think it over thoroughly if it's the average processing time.

Is it possible to execute Azure function Timer trigger with Sequential Execution?

2 Answers2