What Occurs to Processed Messages in Azure Functions if Result is Not Output?

I have created an Azure function that is connected to the messaging endpoint of an IoT Hub in order to trigger the function for all incoming messages. The main purpose of this function is to decompress previously compressed messages using GZIP before they were transmitted via cellular networks.

Currently, our devices are sending data to the cloud without compression, but we are considering adding compression to reduce transmission costs. Additionally, we are utilizing Stream Analytics to analyze messages in real-time and send them to different destinations such as hubs, blobs, and tables. However, if we implement message compression, it may affect how Stream Analytics processes the messages based on their values.

I have developed the function to decompress messages and send the output to an Event Hub for further processing.

My question: If I do not output the content, will the modified messages remain in the queue until they are consumed by another application? Or will my changes be lost if I do not output the results? Furthermore, if the uncompressed message stays in the queue, can I still use Stream Analytics as it is currently configured?

javascriptazureazure-functionsazure-eventhubazure-iot-hub

Answer №1

Are you wondering if Event Hub will retain uncompressed messages that are not consumed immediately? Yes, Event Hub has a configured retention policy in the Azure portal. Additionally, check out the Event Hub archiving feature, which allows automatic transfer of messages to blob storage. Once your uncompressed messages are in the event hub, you can continue using Stream Analytics for processing as usual.

You may also want to explore Azure IoT Hub routing, which routes messages to different custom endpoints based on message properties without needing to decompress the message body. This enables routing without the need to decompress messages, provided your scenario permits use of message properties.

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