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Event Grid - quiet event to revolutionize Azure and more
- 1. Event Grid - quiet event to revolutionize Azure and more Sean Feldman
- 2. So many choices, so many options
- 3. Storage Queues (a.k.a. Simple Queues)
- 4. Service Bus
- 5. Event Hubs
- 6. Event Grid
- 7. Receiving Events Something happens Continuously running process
- 8. There’s a Theme… •Event Driven •Reactive •Pub/Sub Model
- 10. What is Event Grid For?
- 11. Why Microsoft built EventGrid? • Simplicity • Fan-out with high throughput • Pay-per-event with Push model • Built-in and Custom events AWS Sample Events: https://docs.aws.amazon.com/lambda/latest/dg/eventsources.html
- 12. Event Grid Concepts 1. Events: what happened 2. Event Publishers: where it took place 3. Topics: where publishers send events 4. Event Subscriptions: how you receive events 5. Event Handlers: the app or service reacting to the event 6. Security:
- 13. Azure Functions Logic Apps Azure Automation WebHooks Event Hubs Storage Queues IoT Hub Blob Storage Resource Groups Azure Subscriptions Event Hubs Custom Topics Storage (GPv2) Container Registry Service Bus (Premium)
- 14. What is an Event?
- 15. Resource model: extension resource • ARM calls are made to a parent resource • ARM reroutes all Event Grid calls to the Event Grid Resource Provider Storage Resource Provider Queue Service Table Service File Service Event Grid Resource Provider Blob Service Event Grid Resource Extension ARM PUT /subscriptions/mysubscription/resourceGroups/myresourcegroup/providers/Microsoft.Storage/containers/myblobcontai ner/providers/Microsoft.EventGrid/eventSubscriptions/mystoragesubscription?api-version={2017-04-14} { "properties": { “destination“: { "endpointType": “WebHook", “properties”: { "endpointURL": "https://eghttpendpoint1.azurewebsites.net/api/SubscriptionTest?code=abc123"}}, “filter ": { “beginsWith": "blobContainer1 ", "endsWith ": "*.jpg", "eventTypes": [ "eventType1", "eventType2", “eventType3”] } } }
- 16. What an Event Subscription looks like { "properties": { "destination": { "endpointType": "webhook", "properties": { "endpointUrl": "https://dogfoodtesting.azurewebsites.net/api/HttpTriggerCSharp1? code=VXbGWce53l48Mt8wuotr0GPmyJ/nDT4hgdFj9DpBiRt38qqnnm5OFg==" } }, "filter": { "includedEventTypes": [ "blobCreated", "blobDeleted" ], "subjectBeginsWith": “/blobServices/default/containers/mycontainer/log", "subjectEndsWith": ".jpg", "subjectIsCaseSensitive": "true" } } }
- 17. Advanced Filters
- 18. Event Domains
- 19. Topics Subscriptions Filters Haven’t we seen this before?
- 20. Why is Event Grid different? • Cloud Native by design • Which makes it serverless friendly • Engineered for reliability and scale • Supports CNCF Cloud Events v0.1
- 21. Cloud native by design • Always available (99.99% SLA) • Near real-time event delivery (<1s e2e) • At least once delivery • Dynamic scale • 10,000,000 events per second per region • 100,000,000 subscriptions per region • Platform agnostic (WebHook) • Language agnostic (HTTP protocol)
- 22. Serverless friendly • Ease of setup from the Portal • Azure CLI • Powershell
- 23. Engineered for scale and reliability • Cascading log architecture keeps hot path clear Cascading retry logs Replicated Log 10 sec 1 min 1 hr Event Grid Cluster
- 24. Engineered for scale and reliability • Cascading log architecture keeps hot path clear • Each clusters has all subscriptions • Nodes can be added to or removed from cluster Event Grid Cluster
- 25. Engineered for scale and reliability • Cascading log architecture keeps hot path clear • Each clusters has all subs • Nodes can be added to or removed from cluster • Clusters can be added 1 min Event Grid Cluster 1 1 min Event Grid Cluster 2
- 26. US WestUS East Engineered for scale and reliability • Cascading log architecture keeps hot path clear • Each clusters has all subs • Nodes can be added to or removed from cluster • Clusters can be added • Traffic spans regions Event Grid Cluster R1C1 Event Grid Cluster R1C2 Event Grid Cluster R2C1
- 27. Engineered for scale and reliability • Retry intervals • 10 seconds • 30 seconds • 1 minute • 5 minutes • 10 minutes • 30 minutes • 1 hour • Once an hour up to 24 hours • Defaults: 30 delivery attempts / 24 hours
- 28. Engineered for scale and reliability • Dead-lettering • Requires Storage account + container • Dead-lettered events stored as blobs
- 30. Azure Functions Logic Apps Azure Automation WebHooks Event Hubs Storage Queues IoT Hub Blob Storage Resource Groups Azure Subscriptions Event Hubs Custom Topics Storage (GPv2) Container Registry Service Bus (Prem)
- 31. What is CNCF CloudEvents? • Event Protocol Suite developed in CNCF Serverless WG • Common metadata attributes for events • Flexibility to innovate on event semantics • Simple abstract type system mappable to different encodings • Transport options • HTTP(S) 1.1 Webhooks, also HTTP/2 (v0.1) • MQTT 3.1.1 and 5.0 (draft) • AMQP 1.0 (draft) • Encoding options • JSON (v0.1, required for all implementations) • Extensible for binary encodings: Avro, MessagePack, AMQP, etc.
- 33. Ubiquitous • Today there are 10+ publishers • By year end most Azure services will be publishers • Then most Microsoft services • Expect industry to embrace Cloud Events • Grid will be coming to IoT Edge • And beyond…
- 34. How Event Grid is sold • Publish is an operation • Delivery attempt for each destination is an operation • Advanced matching (filtering) is an operation
- 36. How Event Grid composes with Queues and Streams • Other messaging services can be publishers or subscribers to Event Grid • Sometimes you want WebHook • Sometimes Queue • Others Stream • Why: at high scale a queue or log can work better • Grid will give you all of them sub1 sub2 mytopic Storage queue Event Hubs
- 38. Security and Authentication • Validation Handshake (WebHook event delivery) • Event of type Microsoft.EventGrid.SubscriptionValidationEvent • With validation data • Prove • Echo back {validationCode: “value”} • Send GET to validationURL
- 39. Security and Authentication • Topic publishing • “aeg-sas-key” header • “aeg-sas-token” header
- 40. Remember EVENT DRIVEN PUB/SUB NOT ENTERPRISE MESSAGING SCALE THROUGHPUT DEAD-LETTERING RETRY CNCF CLOUD EVENT CROSS-CLOUD
- 42. Segment Simple Queuing Events & PubSub Big Data Streaming Enterprise Messaging Product Storage Queues Event Grid Event Hubs Service Bus What do you care about • Communication within an app • Simple and easy to use • Individual message • Queue semantics / polling buffer • Pay as you go • Communication between apps / orgs • Individual message • Push semantics • Filtering and routing • Pay as you go • Fan out • Many messages in a Stream (think in MBs) • Ease of use and operation • Low cost • Fan in • Strict ordering • Works with other tools (maybe Kafka?) • Instantaneous consistency • Strict ordering • Interoperability (AMQP?) • Security & Non-repudiation • Geo-Replication & Availability • Rich features achieved with compute (de-dupe, scheduling, etc.) What are you willing to sacrifice to get it • Ordering of messaging • Instantaneous consistency • Ordering of messaging • Instantaneous consistency • Server side cursor • Only Once • Reach features achieved with compute • Cost • Simplicity EnterpriseBig DataServerless Segmentation of the cloud messaging market
- 43. THANK YOU Q&A
Editor's Notes
- This session is about tools. Azure messaging tools. I’ll be covering Azure Messaging services to help you to make educated decision what Azure messaging services to use.
- Event Grid is one of the latest additions to the messaging services that has recently GA-ed. It’s an eventing backplane that enables event-driven, reactive programming based on a publish-subscribe model.
- Traditionally, with queues or subscriptions, a message is sent and it needs to be RECEIVED. An application is responsible to poll for messages. This requires a continuous execution of a process that checks for new messages. But when we have applications that need to react to occasionally sent messages, we no longer need to have a 24/7 running process to check for new messages. The polling model is not viable anymore. And with a rise of serverless options, it even became more apparent that some applications need a push model to react to changes.
- And it all boils down to events. Let’s define what an event is.
- Some example would be detecting specific objects in the image; generating thumbnails; etc.
- Simplicity - Point and click to aim events from your Azure resource to any event handler or endpoint. Fan-out - Subscribe multiple endpoints to the same event to send copies of the event to as many places as needed. High throughput - Build high-volume workloads on Event Grid with support for millions of events per second. Pay-per-event - Pay only for the amount you use Event Grid. Built-in Events - Get up and running quickly with resource-defined built-in events. Custom Events - use Event Grid route, filter, and reliably deliver custom events in your app. Reliability - Utilize 24-hour retry with exponential backoff to ensure events are delivered. Advanced filtering - Filter on event type or event publish path to ensure event handlers only receive relevant events.
- An event is the smallest amount of information that fully describes something that happened in the system. Every event has common information like: source of the event, time the event took place, and unique identifier. Every event also has specific information that is only relevant to the specific type of event. For example, an event about a new file being created in Azure Storage has details about the file, such as the lastTimeModified value. Or, an Event Hubs event has the URL of the Capture file. Each event is limited to 64 KB of data. A publisher is the user or organization that decides to send events to Event Grid. Microsoft publishes events for several Azure services. You can publish events from your own application. Organizations that host services outside of Azure can publish events through Event Grid. An event publisher (aka source) is where the event happens. Each event source is related to one or more event types. For example, Azure Storage is the event source for blob created events. IoT Hub is the event source for device created events. Your application is the event source for custom events that you define. Event sources are responsible for sending events to Event Grid. The event grid topic provides an endpoint where the source sends events. The publisher creates the event grid topic, and decides whether an event source needs one topic or more than one topic. A topic is used for a collection of related events. To respond to certain types of events, subscribers decide which topics to subscribe to. System topics are built-in topics provided by Azure services. You don't see system topics in your Azure subscription because the publisher owns the topics, but you can subscribe to them. To subscribe, you provide information about the resource you want to receive events from. As long as you have access the resource, you can subscribe to its events. Custom topics are application and third-party topics. When you create or are assigned access to a custom topic, you see that custom topic in your subscription. When designing your application, you have flexibility when deciding how many topics to create. For large solutions, create a custom topic for each category of related events. For example, consider an application that sends events related to modifying user accounts and processing orders. It's unlikely any event handler wants both categories of events. Create two custom topics and let event handlers subscribe to the one that interests them. For small solutions, you might prefer to send all events to a single topic. Event subscribers can filter for the event types they want. A subscription tells Event Grid which events on a topic you are interested in receiving. When creating the subscription, you provide an endpoint for handling the event. You can filter the events that are sent to the endpoint. You can filter by event type, or subject pattern. An event handler is the place where the event is sent. The handler takes some further action to process the event. Event Grid supports multiple handler types. You can use a supported Azure service or your own webhook as the handler. Depending on the type of handler, Event Grid follows different mechanisms to guarantee the delivery of the event. For HTTP webhook event handlers, the event is retried until the handler returns a status code of 200 – OK. For Azure Storage Queue, the events are retried until the Queue service is able to successfully process the message push into the queue. Event Grid provides security for subscribing to topics, and publishing topics. When subscribing, you must have adequate permissions on the resource or event grid topic. When publishing, you must have a SAS token or key authentication for the topic.
- And this is what’s possible today.
- Here’s an example of an event generated by Storage Blob when a new blob is create. Notice that there’s a topic, subject, and eventType that every event will have. topic - full resource path to the event source. This field is not writeable. Event Grid provides this value. (here: Storage Account) subject - Publisher-defined path to the event subject. (here: Blob Container) eventType - One of the registered event types for this event source. (here: blob created event) Each event is comprised of data. Data schema is defined by event publishers. Note: that events can be bundled and subscribers could receive multiple events.
- The way Event Grid works at ARM level is composition A call is made to a specific resource provider (Storage in this case) with an extension that is EventGrid resource provider. Request body contains subscriber’s endpoint and filtering that are stored by EventGrid to filter out events and publish to subscriber’s endpoints.
- destination - The object that defines the endpoint. filter - An optional field for filtering the types of events. endpointType - The type of endpoint for the subscription (webhook/HTTP, Event Hub, or queue).
- How is Event Grid is different from Azure Service Bus? It’s cloud native by design. Built to address serverless issues with reactive nature of communication. Which includes built in reliability and massive scale it can handle – cross data-center
- It was designed for cloud scenarios, highly available with near real time delivery end-to-end It has at-least-once delivery semantics. The scale is incomparable to a service such as ASB. It was designed in a way that can support various platforms. Yes, not just Azure. And thanks to the HTTP protocol use it can be used from any platform.
- Event Grid adds a small randomization to all retry intervals. After one hour, event delivery is retried once an hour. By default, Event Grid expires all events that aren't delivered within 24 hours. You can customize the retry policy when creating an event subscription. You provide the maximum number of delivery attempts (default is 30) and the event time-to-live (default is 1440 minutes). [30=7 in the first hour + 23 with one-per-hour]
- By default, Event Grid expires all events that aren't delivered within 24 hours. You can customize the retry policy when creating an event subscription. You provide the maximum number of delivery attempts (default is 30) and the event time-to-live (default is 1440 minutes). [30=7 in the first hour + 23 with one-per-hour]
- Cloud Native Compute Foundation - open source software foundation dedicated to making cloud native computing universal and sustainable. A sub-division of CNCF is CloudEvents, lead by major cloud providers and big names in the software industry. The project has 3 major goals: Consistency - The lack of a common way of describing events means developers must constantly re-learn how to receive events. Accessibility - This also limits the potential for libraries, tooling and infrastructure to aide the delivery of event data across environments, like SDKs, event routers or tracing systems. Portability – The portability and productivity we can achieve from event data is hindered overall.
- CloudEvents simplifies interoperability by providing a common event schema for publishing, and consuming cloud based events. This schema allows for uniform tooling, standard ways of routing & handling events, and universal ways of deserializing the outer event schema. With a common schema, you can more easily integrate work across platforms.
- Azure Logic Apps, Azure Automation, Azure Functions for EventGrid Trigger. Only HTTPS is supported!
- Topics use either Shared Access Signature (SAS) or key authentication. We recommend SAS, but key authentication provides simple programming, and is compatible with many existing webhook publishers. You include the authentication value in the HTTP header. For SAS, use aeg-sas-token for the header value. For key authentication, use aeg-sas-key for the header value.
- Summary