Azure-docs: Is it possible to trigger a function by multiple storage accounts?

[kudlatiger]

I am having a requirement to parse all incoming messages using Azure function. I used the BlobTrigger and it works fine, but now i want to monitor multiple storage accounts and trigger the same function. Is it possible?

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Document Details

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• ID: 92f98e4e-7d3a-684a-06e6-e67c1e73ff78
• Version Independent ID: 8b450678-b658-acee-2413-ea4d397030d9
• Content: Create a function in Azure triggered by Blob storage
• Content Source: articles/azure-functions/functions-create-storage-blob-triggered-function.md
• Service: azure-functions
• GitHub Login: @ggailey777
• Microsoft Alias: glenga

[ggailey777]

@kudlatiger As you may know, a function can have only one trigger. However, you can create a fan-in topology that meets the requirements of your scenario.

For example, you can create a Blob triggered function for each storage account you are monitoring. Each of these functions writes the URL of the incoming blob to a single Queue storage queue using a queue output binding. Your function that does the actual blob processing can then have a queue trigger listen on that queue and process each blob that it finds in its queue, which is actually blobs coming from various Storage accounts.

Hope that helps.

[kudlatiger]

Does fan in topology scale well? I have 30+ messages per minute.

Another point is, I am having these blobs in different storage account. one in hot tier and one in cool tier. So where does 'queue' will sit in? Is it in new storage account?

[ggailey777]

@jeffhollan can you help out here, or should we move this discussion to the Forums or Stack Overflow?

[jeffhollan]

Likely best for a forum but I think we could close it out here. I think the pattern I'd recommend is using Event Grid triggered on Storage. In that case you can create a single function but subscribe multiple storage accounts to send events (via Event Grid) to the same function.

[kudlatiger]

Great Thank you. I will try the recommendation. It will help if we have any step by step documentation or blog? It's a real-time scenario and will benefit many Microsoft service users.

[ggailey777]

We have an internal work item now (1556880) to track this requested scenario for possible future documentation. #please-close

[xieb0001]

would like to see this feature, will be great helpful.

[thomaslevesque]

For example, you can create a Blob triggered function for each storage account you are monitoring.

What if the list of storage accounts is dynamic? Is there a way to support such a scenario?