Does IoThub pushes the historic data to event hub when we create a new message routing?

Question

I want to understand whether Event Hub gets the Historic data from IoT Hub at the instance of creation of event hub endpoint?

Answer 1

Hello Vaishnav, Nagesh K, when you create an Event Hub endpoint for an IoT Hub, it does not automatically receive historical data. The data export starts from the moment you enable the endpoint, and only new data from that point onward will be sent to the Event Hub.

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Answer 2

Hello Vaishnav, Nagesh K,

welcome to this moderated Azure community forum.

The answer coming from @Adharsh Santhanam is correct if you check the portal. The EventHub is not able to 'replay' old data.

I add an extra answer because the IoT Hub provides a 'replay' of old data until the moment the data in the IoT Hub is expired via the TTL option.

Check out the Stream Analytics job ability to 'time travel in the past'.

You can stream the data coming out of the IoT Hub multiple times if you set the custom field.

This seems to be an EventHub feature (the underlying streaming functionality within the IoT Hub).

More information about this EventHub capability can be found in the Reading Events sample for the Azure.Messaging.EventHubs package.

I'm not sure if this code sample will work for the IoT Hub event-hub compatible endpoint too.

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