October 30, 2022

Top 20 AWS EventBridge Interview Questions and Answers

                    Without having to write any code, Amazon EventBridge offers real-time access to data changes in AWS services, your own applications, and software as a service (SaaS) applications. AWS Lambda, Amazon Simple Notification Service (SNS), and Amazon Kinesis Data Firehose are just a few of the AWS services you can choose from as targets once you've chosen an event source on the Amazon EventBridge panel. The events will be automatically delivered via Amazon EventBridge in close to real-time. 

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Ques. 1): What are the steps for using Amazon EventBridge?


Choose an event source from a list of partner SaaS applications and AWS services by logging into your AWS account, going to the Amazon EventBridge dashboard, and selecting that source. Make sure your SaaS account is set up to emit events if you're using a partner application, then accept the source in the provided event sources section of the Amazon EventBridge console. Your event bus will be immediately created by Amazon EventBridge and used to route events. As an alternative, you can instrument your application with the AWS SDK to begin broadcasting events to your event bus. Add a target for your events and optionally configure a filtering rule; the target may be a Lambda function, for instance. The events will be automatically ingested, filtered, and sent to the specified target in a secure and highly available manner by Amazon EventBridge.

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Ques. 2): EventBridge API Destinations: What are they?


Developers may regulate throughput and authentication while sending events back to any on-premises or SaaS apps using API Destinations. EventBridge will handle security and delivery while customers set rules with input transformations that transfer the event format to the format of the receiving service. When a rule is activated, Amazon EventBridge transforms the event in accordance with the parameters supplied and sends it to the defined web service along with the authentication data specified when the rule was created. Developers no longer have to create authentication components for the service they wish to utilise because security is already built in.


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Ques. 3): How are CloudWatch Events related to Amazon EventBridge?


CloudWatch Events are improved and expanded upon by Amazon EventBridge. It makes use of the same service API, endpoint, and underpinning infrastructure. Nothing has changed for current CloudWatch Events users; you can continue to utilise the same API, CloudFormation templates, and console. Customers told us that CloudWatch Events is the best service for creating event-driven architectures, so we created new features to let customers link data from their own SaaS apps and those of other companies. We have launched this feature under the moniker Amazon EventBridge rather than under the CloudWatch service to reflect its extension outside the monitoring use case for which it was designed.


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Ques. 4): Which AWS services are included with Amazon EventBridge as event sources?


Over 90 AWS services, including AWS Lambda, Amazon Kinesis, AWS Fargate, and Amazon Simple Storage Service, are available as event sources for EventBridge (S3).

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Ques. 5): How do I filter which events are delivered to a target?


You can filter events with rules. A rule matches incoming events for a given event bus and routes them to targets for processing. A single rule can route to multiple targets, all of which are processed in parallel. Rules allow different application components to look for and process the events that are of interest to them. A rule can customize an event before it is sent to the target, by passing only certain parts or by overwriting it with a constant.  


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Ques. 6): What does the feature of schema discovery do?


The procedures for locating schemas and adding them to your registry are automated by schema discovery. Each event's schema is automatically uploaded to the registry when schema discovery is enabled for an EventBridge event bus. Schema discovery will instantly update the schema in the registry if the schema of an event changes. Once a schema has been uploaded to the registry, you can create a code binding for it either in the EventBridge console or directly in your IDE. This enables you to represent the event in your code as a strongly-typed object and utilise IDE features like validation and auto-complete.

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Ques. 7): The Serverless Application Model (AWS SAM) allows for the use of schema.


Yes, you may build new serverless apps on EventBridge for any schema as an event type using the interactive mode of the most recent AWS SAM CLI. Simply select the "EventBridge Starter App" template and the event's schema, and AWS SAM will create an application with a Lambda function that is called by EventBridge and handling code for the event. This implies that you may utilise IDE tools like validation and auto-complete and treat an event trigger like a regular object in your code.

AWS Toolkit for Visual Studio Code and the AWS Toolkit for Jetbrains (Intellij, PyCharm, Webstorm, Rider) plugins both offer the ability to create serverless apps from this template with a schema acting as a trigger right inside of these IDEs.


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Ques. 8): How can writing less code using the schema registry benefit me?


In order to avoid having to manage your event schema manually, you can first utilise schema discovery to automatically identify schema for any events transmitted to your EventBridge event bus and save them in the registry. Second, you can develop and download code bindings for this schema when creating apps that process events on your bus so that you can use strongly-typed objects right away. Deserialization, validation, and guesswork for your event handler are all avoided as a result.


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Ques. 9): How can I protect my use of Amazon EventBridge?


You can define the actions that a user within your AWS account is permitted to take by integrating Amazon EventBridge with AWS Identity and Access Management (IAM). You could, for instance, set an IAM policy that allows only specific users in your company to add event targets or create event buses.


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Ques. 10): What justifies my use of global endpoints?


By reducing the quantity of data at risk during service interruptions, global endpoints assist you in giving your end users a better experience. By being able to failover your event ingestion to a backup region automatically and without the need for manual intervention, you can increase the stability and resilience of your event-driven applications. To decide whether to failover and when to transport events back to the primary region, you can freely set failover criteria using CloudWatch Alarms (through Route53 health checks).


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Ques. 11): What are the Recovery Point Objective (RPO) and Expected Recovery Time Objective (RTO)?


The Recovery Time Objective (RTO) is the period of time following a failure when the backup Region or target will begin to receive new events. The amount of data that will remain unprocessed in the event of a failure is measured by the Recovery Point Objective (RPO). The RTO and RPO for global endpoints will be 360 seconds provided you adhere to our prescriptive recommendations for alarm setting (with a maximum of 420). When calculating RTO, the time is taken into account for setting off CloudWatch Alarms and updating Route53 health check statuses. Events that are not copied to the secondary region and remain in the primary region until the service or region recovers are included in the RPO time.


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Ques. 12): EventBridge Archive and Replay Events: What Is It?


Customers can reprocess previous events back to an event bus or a specific EventBridge rule using the new feature Event Replay for Amazon EventBridge. Developers can use this functionality to quickly debug their apps, extend them by hydrating targets with historical events, and fix mistakes. Developers may rest easy knowing that they will always have access to any event submitted to EventBridge thanks to Event Replay.


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Ques. 13): Why would I use Amazon EventBridge into my SaaS application?


SaaS vendors can easily integrate their services with the event-driven architectures created by their clients and hosted on AWS thanks to Amazon EventBridge. Millions of AWS developers may now directly access your product thanks to Amazon EventBridge, opening up new applications. It provides an entirely safe, scalable, and auditable solution to convey events without requiring the SaaS vendor to handle any eventing infrastructure.


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Ques. 14): Does Amazon EventBridge allow me to publish my own events?


Yes. Through the use of the service's APIs, you can create unique application-level events and publish them to Amazon EventBridge. Additionally, you can create scheduled events that are generated on a regular basis and process these events in any of the available targets for Amazon EventBridge.


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Ques. 15): What is the price of the schema registry?


The schema registry is free to use, however when you enable schema discovery, there is a fee per ingested event. The majority of development consumption should be covered by the free tier of 5M ingested events offered by schema discovery each month. For usage above the free tier, there is an extra charge of $0.10 per million ingested events.

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 Ques. 16): When should I make use of Amazon SNS and when of Amazon EventBridge?


Your choice will depend on your particular requirements, but you may create event-driven apps using both Amazon EventBridge and Amazon SNS. When creating an application that responds to events from SaaS applications and/or AWS services, Amazon EventBridge is advised. The only event-based service that interacts directly with external SaaS providers is Amazon EventBridge. Without needing developers to create any resources in their account, Amazon EventBridge also automatically ingests events from over 90 AWS services. Over 15 AWS services, including Amazon Lambda, Amazon SQS, Amazon SNS, Amazon Kinesis Streams, and Kinesis Data Firehose, are presently supported as targets by Amazon EventBridge. With a limited throughput at launch that can be expanded upon request and an average latency of about half a second, Amazon EventBridge is currently in beta.


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Ques. 17): How should I failover my global endpoint? What metrics should I use?


In order to make it simple for you to identify whether there are any difficulties with EventBridge that would necessitate you failovering your event ingestion to the secondary region, we have added a new measure that shows the end-to-end latency of Amazon EventBridge. By offering a pre-populated CloudFormation stack (that you may alter if you so desire) for setting a CloudWatch Alarm and Route53 Health Checks in the console, AWS has made it simple for you to get started.


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Ques. 18): Do I need to enable replication?


Yes. To reduce the amount of data that is vulnerable during a service failure, replication should be enabled. You can update your applications to publish your events to the global endpoint after setting up your custom buses in both regions and making the global endpoint. By doing this, after the problem is resolved, your incoming events will be copied back to the primary area. To ensure that none of your events are lost in the event of a disruption, you can archive your events in the secondary region. You can replicate your design in the secondary zone to carry on processing events while you swiftly recover from disturbances. In order to assure automatic recovery once the problem has been resolved, you must additionally enable replication.


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Ques. 19): Should I failover my global endpoint using metrics from my subscriber?


We don't advise integrating subscriber metrics in your health check because doing so can force your publisher to switch to the backup area if one subscriber has a problem even though all the others are fine in the primary region. You should enable replication if one of your subscribers in the primary region isn't processing events properly in order to make sure that your subscriber in the secondary region can.

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Ques. 20): How does a global endpoint increase my applications' availability?


Events are routed to the event bus in your main area after they are published to the global endpoint. Your healthcheck is flagged as unhealthy and incoming events are directed to the secondary area if faults are found in the primary region. Using CloudWatch Alarms (through Route53 health checks) that you set, errors can be quickly found. As soon as the problem is resolved, AWS routes fresh events back to the original Region and get on with event processing.


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