Set service bus topic max message size via Bicep script

Question

Hi,

Is it possible to set Service bus Topic max message size via Bicep to 10Mb?

Regards,

Laurens van de Venn

Answer 1

@Laurens van de Venn ,

Thank you for your inquiry regarding setting the maximum message size for Azure Service Bus topics via Bicep templates. I’d like to clarify the situation and provide more detailed information on this feature.

Configuring Message Size in Azure Service Bus

While Azure Service Bus does not allow you to directly configure message size limits for the Standard tier, it is possible to configure the maximum message size for Service Bus topics in the Premium tier using the maxMessageSizeInKilobytes property in Bicep.

This configuration applies specifically to Premium tier namespaces, and the setting is supported when using the AMQP protocol, which allows larger message sizes.

Example Bicep Template for Premium Tier

Here is an example of how you can configure the message size for a Service Bus topic in the Premium tier:

https://learn.microsoft.com/en-us/azure/templates/microsoft.servicebus/namespaces/topics?pivots=deployment-language-bicep#resource-format

In this example:

• The maxMessageSizeInKilobytes property is set to 1024 KB (1 MB) for the topic.

The namespace is configured with the Premium SKU, which supports larger message sizes.

Key Points to Consider

Premium tier only: The ability to set the message size is available only in the Premium SKU.

AMQP protocol: This configuration works when using the AMQP protocol. For HTTP/SBMP protocol, the message size limit is fixed to 1 MB.

Standard tier: If you're using the Standard tier, the maximum message size is restricted to 256 KB and cannot be configured.

Conclusion

Yes, you can configure the maximum message size for a Service Bus topic in the Premium tier using the maxMessageSizeInKilobytes property within your Bicep template. This allows you to set the message size limit up to 100 MB (for AMQP) depending on your needs.

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

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