Does EventGridTrigger support batch events generated from Event Grid "output batching"?

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Does EventGridTrigger support batch events generated from Event Grid "output batching"?

AzureSDE 116

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I'm trying to understand the behavior of output batching in EventGrid when using EventGridTrigger in Azure Function v2 functions.

I turned on the output batching in the event grid. My subscriber function uses 'EventGridTrigger' and the number of events received by my subscriber function is always 1.

Does this mean turning on output batching in EventGrid in this scenario does not actually utilize the batching capability in Event Grid?

AzureSDE 116 Reputation points

2021-11-19T22:14:10.897+00:00

@MayankBargali-MSFT - Please advise.

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AzureSDE 116 Reputation points

2021-11-19T22:14:10.897+00:00

@MayankBargali-MSFT - Please advise.

Answer 1

Pramod Valavala 20,661 Microsoft Employee Moderator

@AzureSDE The Event Schema received by the configured endpoints is always an array and when leveraging output batching, there are more than one event in the received payload. But the Event Grid Trigger invokes your function once for each event unless you are binding to an array.

Also, note that batching is not guaranteed to include the max number of events configured, especially with low event rates.

Anonymous

2022-02-15T09:17:03.87+00:00
@Pramod Valavala We have declared the following java event grid trigger:

@FunctionName("WebhookEventTrigger") public void run(@EventGridTrigger(name = "event") String eventGridEventJson, final ExecutionContext context) { // code omitted for brevity }

However, we only receive one event at a time, despite of having set up the following parameters for batching on the event grid subscription:
Max events per batch: 100
Preferred batch size in kilobytes: 128

We are publishing 400 events at a time, each event published is no more than 100 bytes.

What are we missing? Can you further elaborate on what you mean by "But the Event Grid Trigger invokes your function once for each event unless you are binding to an array"?

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Does EventGridTrigger support batch events generated from Event Grid "output batching"?

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