异步定时器触发功能

Question

Is it possible to create a function on a TimerTrigger, that will run asynchronously? In other words, a function that will not cause the trigger to wait for completion, before scheduling the next execution?

We have a scenario where we need to schedule a function execution every 5 seconds. Most executions take less than a second to complete, but occasionally, they can take longer (more than 5 seconds). In those situations, we still want our 5-second schedule to kick in, even though that would cause parallel executions.

According to this :

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.

What I'm looking for, is a possible way to avoid delaying the next execution.

Answer 1

I think adding a queue would likely address your issue and is the most common async processing pattern. Instead of the timer function processing the request have the request passed on as a message to a storage queue when the timer trigger is executed. A second function then processes the actual request without impacting any execution times on the timer function.

So essentially timer trigger -> message -> queue trigger . More details on azure function storage queue triggers can be found at https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-storage-blob#trigger---example