I'm exploring using azure event hub as an event consumer.
So my .NET application sends events to the azure event hub. The event hub by default has 4 partitions.
I want the events to be stored in the azure blob storage and also be passed to another .NET application.
This question is to ask - whether the azure event hub has the ability to push the events to the blob and to my .NET application, or will the subscriber (blob and .NET application) need to pull the data from the azure event hub partition?
Or will my .NET subscriber need to pull events from the azure blob?
You need to create a receiver using .Net,
Here is an example on the docs.
// Read from the default consumer group: $Default
string consumerGroup = EventHubConsumerClient.DefaultConsumerGroupName;
// Create a blob container client that the event processor will use
storageClient = new BlobContainerClient(blobStorageConnectionString, blobContainerName);
// Create an event processor client to process events in the event hub
processor = new EventProcessorClient(storageClient, consumerGroup, ehubNamespaceConnectionString, eventHubName);
// Register handlers for processing events and handling errors
processor.ProcessEventAsync += ProcessEventHandler;
processor.ProcessErrorAsync += ProcessErrorHandler;
// Start the processing
await processor.StartProcessingAsync();
You can enable "capture" on the eventhub and persist the streamed events to a storage account of your choice. Please check below for more details.
https://learn.microsoft.com/en-us/azure/event-hubs/event-hubs-capture-overview
Related
We designed an eventhub trigger which reads the messages from event hub and inserts the messages into cosmos. During this process if any unhandled exceptions/throttling for cosmos we are moving these messages to blob.
Do we have any way we can move the messages back to event hub from blob through azure portal?. This helps azure admin to move the messages to eventhub in the production
No I don't think there is a way to move the message back in the portal UI.
I would use a combination of approaches here. First I would use autoscaling of Cosmos DB to lower the risk of you being throttled and to keep you from overprovisioning and thus overspending on Cosmos DB. Secondly I would implement a retry logic with exponential back-off in your trigger to further minimize the risk of throttling being a problem.
If you still get failed events, you might not have to push them to separate storage after all. All events remain by default in Event Hubs for seven days. You can just reread the entire thing if you want.
If that is not a good approach, I would push the failed messages to a queue (Storage queue or Service Bus Queue) and have an Azure Function on a timer trigger to process the queue and send the messages back to the Event Hub again. Then it would be fully automatic and admin does not have to do anything.
Do we have any way we can move the messages back to event hub from blob through azure portal?
One of the workarounds is to use logic apps where you can create a workflow from Azure blob storage to event hub. Here is a sample flow of my logic app.
I want to send an event that is sent to Azure Service Bus topic to an event hub. Is this possible?
Details:
I am working with a different team in my company that receives third party events (via webhook) to Azure Service Bus topic and this is further used in different application.
My team wants to now listen/subscribe to this topic using our existing event hub and using azure capture store these events to a storage account.
I did the following:
I created a subscription to their topic in their Azure Service Bus.
I created an event hub in my Event hub namespace.
I am not sure, how to now connect the azure service bus topic subscription to send those events to my event hub.
Thanks for your time.
Service bus operates with the receivers having to pull messages from it. This is opposite to Eventgrid which pushes the events to its subscribers. Eventhub does not pull messages from the source, we need to push messages into it. So you cannot achieve your requirement without an extra component between Service Bus and Eventhub.
One of the possible components would be a service bus topic triggered azure function LINK which writes into the eventhub using output binding LINK or the SDK LINK.
You will need to choose your service plan carefully depending on the volume of messages expected but usually Consumption plan will suit this purpose.
In one of the recent project, I need to add messages(>200kb) to Azure Event Hub through an endpoint exposed by Azure API Management Service. Then, the Stream Analytics job reads this message from Event Hub and writes it to the respective tables in SQL Server.
I was using "log-to-eventhub" policy to log the messages to event hub. But it has a size limitation associated with it, which is 200kb.
What would be the best approach to overcome this size limitation or should I consider a different way to log the payload to Event Hub?
Any help is much appreciated.
Here is a limit about this described in official docs.
The maximum supported message size that can be sent to an event hub
from this API Management policy is 200 kilobytes (KB). If a message
that is sent to an event hub is larger than 200 KB, it will be
automatically truncated, and the truncated message will be transferred
to event hubs.
You could consider using Azure Event Hubs output binding for Azure Functions.
About How Function consume Event Hubs events, you could try using multiple parallel Functions instances under consumption plan.
We are looking to consume data from another Event hub not in our Tenant and want to ensure a guarantee delivery. Can an Event Hub be configured to connect to another Event Hub without build an Azure Function, Databricks process or some other solution OOTB?
Today we are planning to setup the consumer Hub using either the HTTP or AMQP protocols and have the producer push via some code.
From what I have read Stream Analytics could do this but doesn't sound like it's reliable and would prefer to leverage a feature before building out a solution.
I would suggest you to have a look at Azure Eventgrid:
It can ingest data from an Eventhub: Azure Event Hubs as an Event Grid source
It can send data to an EventHub: Event hub as an event handler for Azure Event Grid events
It doesn't require coding but will still require configuration.
I am using the Azure function to process message from IOT hub and output to Blob storage.
enter image description here
But the function missed IOT messages when I send in high frequency.
For example, I send 30 messages from 20:40:16 to 20:40:23 but only 3 are processed and stored in to the Blob storage and I have no ideal where the rest 27 went.
enter image description here
I am using the function consumption plan and Azure declares it will auto scaling depends on the load.
But from the above activity log, it only one thread is running and not even queue the input and cause some message lost.
So, what I should do to catch all messages from IOT hub?
Found the solution myself.
The trigger need to change from Azure Event Hubs to Event Grid Trigger as the images show below.
Azure Event Hubs
Azure Grid Trigger
Azure Functions on a consumption plan can handle this load, but you might want to make a separate Consumer Group in your IoT Hub that the Function can use. In the Azure Portal, go to Built-in endpoints and add a new Consumer Group.
You then have to specify in your Function which Consumer Group to use
[FunctionName("Function1")]
public static async Task Run([IoTHubTrigger("messages/events",ConsumerGroup = "functions", Connection = "EventHubConnectionAppSetting")]EventData message,
I tested this with a consumption plan Function listening to IoT Hub default endpoint and writing to blob storage with an 8 second delay to make it more like your function. I'm seeing no loss in messages, whether I send 30 or 100 messages. Make sure that no other applications are using your new Consumer Group!