Service bus triggered azure function behaviour

Question

Hi Team,

I have scenario where we are sending thousands of messages to Azure service bus topic and then we have 'Service bus topic trigger' azure function.

Azure service bus - Standard tier
Azure function (Topic trigger) - App service plan
Topic message size - 100kb

I want to know if there are 1k bulk messages are receiving in service bus topic, then how the topic triggered azure function will behave? Will azure function create those many instances or it will be managed by single instance of Azure function?

Accepted Answer

@Jaydeep Suryawanshi ,

Welcome to Microsoft Q&A Platform!
Thanks for reaching out your query on Service bus triggered azure function behaviour.

When multiple messages (like 1,000) are sent to your Azure Service Bus topic, the Azure Function will process them concurrently, but it will depend on your configuration. Since you're using an App Service Plan, it won't scale automatically like a Consumption Plan. However, if you have set up scaling, the function can scale horizontally to process the messages in parallel across multiple instances. Otherwise, the function will process them one by one in batches.

If you’d like to optimize performance, you can adjust settings such as batchSize and maxConcurrentCalls in the host.json file. This controls how many messages are processed at once and ensures efficient handling of the load.

For more details, you can refer to the official documentation:

Azure Service Bus bindings for Azure Functions

Hope this helps. Do let us know if you any further queries.

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Service bus triggered azure function behaviour

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