BlobTrigger event fires Azure Function multiple times

Question

BlobTrigger event fires Azure Function multiple times

Paolo Limardo 0

Hi all, I have developed an azure function that run when a blob trigger event grid (blob created) is catched in an azure storage account datalake container. The function was developed using Visual Studio Code with python programming language and its plan is consumption plan.

The azure function should take a file from the storage and process it producing an output file.

But when a blob trigger start sometimes it fires the azure function multiple time (generally twice) and produce multiple copies of the file output.

Maybe it's an azure function or blob trigger bug?

Please help.

MuthuKumaranMurugaachari-MSFT 22,441 Reputation points Moderator

2023-06-20T15:54:57.8566667+00:00
Paolo Limardo Thanks for posting your question in Microsoft Q&A. Can you share the below info which will help in understanding the issue better?

Can you confirm the storage account type? general-purpose V2 with hierarchical namespace enabled (Azure Data Lake Storage Gen2)?

Have you enabled Diagnostic setting in the storage account? If not, enable https://learn.microsoft.com/en-us/azure/event-grid/enable-diagnostic-logs-topic and validate if there are multiple Put operations for the same file. Please share the activity ID, timestamp if possible.

How was the file uploaded to the storage account? (portal, CLI or any SDK)

Share code snippet, Functions runtime and confirm if this occurred both in local as well as deployed in azure.
Roman Kiss 2,246 Reputation points

2023-06-20T20:28:55.03+00:00

Hi @Paolo Limardo ,

What is the processing time of your Azure EventGrid Fuction? It should be within 30 seconds to prevent a retrying process.

Thanks

Roman
MuthuKumaranMurugaachari-MSFT 22,441 Reputation points Moderator

2023-06-21T13:26:50.09+00:00

Paolo Limardo Just a follow up to see if you can share the additional information requested. That will help in assisting you better. If your issue is resolved, feel free to share it with the community and surely it will benefit others.

1 answer

Your answer

MuthuKumaranMurugaachari-MSFT 22,441 Reputation points Moderator

2023-06-20T15:54:57.8566667+00:00

Paolo Limardo Thanks for posting your question in Microsoft Q&A. Can you share the below info which will help in understanding the issue better?

Can you confirm the storage account type? general-purpose V2 with hierarchical namespace enabled (Azure Data Lake Storage Gen2)?

Have you enabled Diagnostic setting in the storage account? If not, enable https://learn.microsoft.com/en-us/azure/event-grid/enable-diagnostic-logs-topic and validate if there are multiple Put operations for the same file. Please share the activity ID, timestamp if possible.

How was the file uploaded to the storage account? (portal, CLI or any SDK)

Share code snippet, Functions runtime and confirm if this occurred both in local as well as deployed in azure.
Roman Kiss 2,246 Reputation points

2023-06-20T20:28:55.03+00:00

Hi @Paolo Limardo ,

What is the processing time of your Azure EventGrid Fuction? It should be within 30 seconds to prevent a retrying process.

Thanks

Roman
MuthuKumaranMurugaachari-MSFT 22,441 Reputation points Moderator

2023-06-21T13:26:50.09+00:00

Paolo Limardo Just a follow up to see if you can share the additional information requested. That will help in assisting you better. If your issue is resolved, feel free to share it with the community and surely it will benefit others.

Answer 1

Cristian SPIRIDON 4,486 Volunteer Moderator

Hi Paolo Limardo, it could be an Azure bug: https://learn.microsoft.com/en-us/answers/questions/1094630/azure-function-trigger-twice. Can you try the suggested solution and see if that solve the issue? Hope this helps!

Paolo Limardo 0 Reputation points

2023-06-20T10:34:39.6433333+00:00

Hello @Cristian SPIRIDON , thanks for the answer but it didn't help to solve the problem. I tried to delete "Source=EventGrid" as mentioned in the post but it doesn't work yet.
Paolo Limardo 0 Reputation points

2023-06-20T10:35:00.36+00:00

Hello @Cristian SPIRIDON , thanks for the answer but it didn't help to solve the problem. I tried to delete "Source=EventGrid" as mentioned in the post but it doesn't work yet.

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BlobTrigger event fires Azure Function multiple times

1 answer

Your answer