April 16, 2024

Azure Event Grid vs Azure Service Bus

9 min read
If you're looking for a reliable messaging service for your Azure-based applications, you might be wondering which one to choose between Azure Event Grid and Azure Service Bus.
Two overlapping cloud-shaped objects

Two overlapping cloud-shaped objects

As Microsoft continues to expand its cloud computing offerings, developers and IT professionals have access to a range of high-performance messaging technologies. Two of the most popular messaging services offered by Microsoft are Azure Event Grid and Azure Service Bus. Both of these platforms have unique features, advantages, and use cases. In this article, we’ll take a deep dive into Azure Event Grid vs Azure Service Bus, comparing the two platforms in detail to help you make an informed choice when selecting a messaging platform for your project or application.

What is Azure Event Grid and how does it work?

Azure Event Grid is an event-driven computing service that simplifies the process of building reactive, event-driven applications. With this platform, developers can create real-time web applications, serverless applications, and event-driven workflows in a matter of minutes. The service operates on a publish-subscribe model, which means that event publishers send messages to a centralized hub. Event subscribers subscribe to these events and receive notifications whenever these events are triggered.

Azure Event Grid is designed to handle high-volume, high-frequency events and supports serverless computing to enable scaling and flexibility. Developers can use Azure Event Grid to build reactive, event-driven applications quickly and easily, from a simple web application to a complex event-driven workflow.

One of the key benefits of Azure Event Grid is its ability to integrate with a wide range of Azure services, including Azure Functions, Logic Apps, and Event Hubs. This means that developers can easily create event-driven workflows that span multiple services, without having to worry about managing the underlying infrastructure.

Another advantage of Azure Event Grid is its support for custom events. Developers can define their own custom events and publish them to the Event Grid, allowing other applications to subscribe to these events and take action based on them. This makes it easy to build highly customized, event-driven applications that meet specific business needs.

Introduction to Azure Service Bus and its functionalities.

Azure Service Bus is a full-featured, enterprise-grade messaging platform that provides reliable message delivery and decoupling of applications and services. With this platform, messaging can be sent asynchronously between applications, whether these applications are running in the cloud or on-premises. The service provides various messaging features, including publish/subscribe messaging, message queuing, and the ability to store messages temporarily until they are consumed by subscribers.

Azure Service Bus is designed for complex messaging scenarios as it provides a suite of features and tools that enable developers to build and manage sophisticated messaging workflows efficiently. These workflows include pub/sub messaging, request/reply messaging, and durable messaging, to name a few.

One of the key benefits of Azure Service Bus is its ability to handle large volumes of messages with ease. The platform can handle millions of messages per second, making it an ideal choice for applications that require high throughput and low latency. Additionally, Azure Service Bus provides built-in support for message batching, which allows multiple messages to be sent and received in a single operation, reducing network overhead and improving performance.

Understanding the key differences between Azure Event Grid and Azure Service Bus.

Although both Azure Event Grid and Azure Service Bus offer messaging services, they differ in several ways. Azure Event Grid is optimized for real-time streaming of events, while Azure Service Bus is designed for traditional enterprise messaging using queues and topics. Azure Event Grid is a newer service and caters to modern application demands, whereas Azure Service Bus has been around for a long time and is better suited for legacy applications.

Azure Service Bus includes more extensive messaging features, including message queuing, durable messaging, and brokered messaging, while Azure Event Grid only supports basic event-driven workflows. Additionally, Azure Service Bus allows for message transactions and multi-layered security for more enterprise-focused applications. Azure Event Grid is ideal for applications that require real-time, reactive data processing, while Azure Service Bus is designed for applications that require asynchronous and transactional communication.

Another key difference between Azure Event Grid and Azure Service Bus is their pricing models. Azure Event Grid charges based on the number of events processed, while Azure Service Bus charges based on the number of messages sent and received. This means that if you have a high volume of events but low message volume, Azure Event Grid may be more cost-effective for your application.

Furthermore, Azure Event Grid integrates seamlessly with other Azure services, such as Azure Functions and Logic Apps, making it easier to build event-driven workflows. On the other hand, Azure Service Bus has more extensive integration options with other messaging systems, including support for AMQP, MQTT, and JMS protocols.

Which use cases are better suited for Azure Event Grid?

Azure Event Grid is ideal for applications that require real-time event-driven processing. This includes applications that require reactive processing of data such as streaming data sources, IoT devices, and other types of event-driven applications. Event Grid can distribute events to any service that can handle HTTP requests, which means that it can be used with serverless architectures such as Azure Functions, Lambda, or Cloud Functions. Event Grid is also perfect for implementing event-driven architectures in modern applications.

When should you choose Azure Service Bus over Azure Event Grid?

Azure Service Bus is better suited for applications that require more advanced messaging patterns such as message transactions and durable messaging. Additionally, Azure Service Bus is ideal for enterprise-focused applications that require multi-layered security, support for message scheduling, dead-lettering, batch processing, and message forwarding to other endpoints. Service Bus is perfect for integrating legacy applications with modern cloud applications, and for applications running on hybrid cloud scenarios.

How do you set up and configure Azure Event Grid?

To set up and configure Azure Event Grid, you must first create an Event Grid subscription in your Azure portal. Selecting a subscription will display a list of available events to which you can subscribe or unsubscribe. You can also set up filters and routing options to ensure that only events that meet your criteria are sent to your endpoint.

To subscribe to an event grid, you must provide a webhook. This can be a custom endpoint or an Azure Function. Once you have set up your endpoint, you can start creating events by publishing custom events to your event grid. This will trigger your endpoint, which can then consume the event and trigger any additional logic associated with your event processing.

Step-by-step guide to setting up and configuring Azure Service Bus.

Setting up and configuring Azure Service Bus is a simple process. The first step is to create a service bus namespace. This is done from the Azure portal, and it is the root container that groups messaging entities like queues, topics, and subscriptions together under a unique identifier. Once the namespace is created, you can create messaging entities like queues or topics.

Once you’ve created a messaging entity, you can configure its behaviour by setting up features like message deferral, batching, sessionful messaging, and more. Each of these features can be tweaked based on your specific requirements. Finally, you can create a client-side application to send or receive messages from Service Bus. This can be done using a variety of SDKs, including .NET, Java, and Python, to name a few.

Performance benchmarking: Comparing the performance of Azure Event Grid and Azure Service Bus.

When it comes to performance, both Azure Event Grid and Azure Service Bus are designed to handle high-volume messaging scenarios. Azure Service Bus is designed to handle messages that require guaranteed delivery, durability, and transactional reliability. This means that Service Bus is slower in terms of latency but is reliable and always delivers messages in order. Azure Event Grid, on the other hand, has low latency and is excellent for real-time messaging scenarios.

In terms of throughput, both services are capable of handling millions of events per second, making them ideal for high-velocity scenarios. Azure Event Grid is designed for event processing, and therefore, it has a lower overhead than Service Bus. This means that Event Grid is faster than Service Bus for many scenarios.

Security features of both platforms: Which is more secure?

Both Azure Event Grid and Azure Service Bus have robust security features. Azure Service Bus is designed for enterprise-level security and provides several security features like claims-based authentication, OAuth token authentication, and SAS authentication. Service bus also provides more granular access controls at the entity level, ensuring that specific users or roles only access the required messaging entities.

Azure Event Grid has a multi-layered security model with data encryption, Identity and Access Management (IAM), and integrated network security protocols. Event Grid also allows you to set up Role-Based Access Controls (RBAC) at the subscription or resource group level. These features make Event Grid a secure platform for event-based processing.

Pricing comparison: Cost considerations when choosing between Azure Event Grid and Azure Service Bus.

Azure Service Bus has different pricing models depending on the version of the service, the messaging quotas, authorisations, and service level agreements (SLAs) required. Azure Event Grid pricing is based on the number of events processed per month. In both cases, there are different tiers based on the amount of messaging required, and there are different billing models based on message size, message count, and request count. For more information on pricing and billing for Azure Service Bus or Azure Event Grid, check the Azure pricing calculator on the Microsoft website.

Best practices for using Azure Event Grid or Azure Service Bus in your applications.

When using Azure Event Grid or Azure Service Bus in your applications, it’s essential to follow best practices to ensure the optimal performance and reliability of your messaging workflows. These best practices include setting up durable messaging, using message batching to reduce costs, and optimising the number of messages published or consumed per transaction. It’s also essential to implement security features such as authentication, authorisation, and network security to ensure the security of your messaging flows.

Real-world examples of companies using either platform successfully.

Azure Event Grid is used by a variety of companies, including Adobe, who use it to monitor user events at scale. Azure service bus is used by Microsoft’s own internal applications and is an integral part of the Azure infrastructure. Other companies that use Service Bus include Coca-Cola, Mercedes-Benz, and Vistaprint. Both platforms have been successfully implemented in a variety of use cases, from IoT and gaming to finance and transportation.

Migrating from one platform to another: What you need to know.

If you’re thinking about migrating from one platform to another, several factors need to be considered. These include the difference in messaging patterns, APIs, and security protocols. It’s essential to understand how the features of the service you’re migrating from will map to the destination. You also need to devise a migration strategy that considers risks, data integrity, and minimizes downtime. Knowing the above can help you migrate successfully from Azure Event Grid to Azure Service Bus or vice versa.

Insights into the future development roadmap for both platforms.

Microsoft is continuously improving and refining both Azure Event Grid and Azure Service Bus. Future development plans for Azure Event Grid include support for custom topics, advanced filtering and enhanced security, and integration with more Microsoft services. For Azure service bus, Microsoft is adding more security features, including access control modifications, expanded Transport Layer Security (TLS) support, and deployment in Azure Functions. Microsoft is always adding new features and improving current designs, so check the Microsoft roadmap to keep up to date with changes.


Azure Event Grid and Azure Service Bus are two messaging platforms that provide developers with a variety of messaging options. Choosing the right messaging platform depends on your project or application requirements. Azure Event Grid is better suited for event-driven systems that require real-time processing, while Azure Service Bus is designed for traditional enterprise messaging systems. Both platforms have their strengths and weaknesses. By following best practices, understanding the performance considerations, and considering the differences between the two platforms, it’s possible to choose the best messaging platform for your application.

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