Question

A company has an application that collects Notifications from thousands of alarm systems. The notifications include alarm notifications and information notifications. The information notifications include the system arming processes, disarming processes, and sensor status.

All notifications are kept as messages in an Amazon Simple Queue Service (Amazon SQS) queue. Amazon EC2 instances that are in an Auto Scaling group process the messages. A SysOps administrator needs to implement a solution that prioritizes alarm notifications over information notifications.

Which solution will meet these requirements?

A. Adjust the Auto Scaling group to scale faster when a high number of messages is in the queue.
B. Use the Amazon Simple Notification Service (Amazon SNS) fanout feature with Amazon SQS to send the notifications in parallel to all the C2 instances
C. Add an Amazon DynamoDB stream to accelerate the message processing
D. Create a queue for alarm notifications and a queue for information notifications. Update the application to collect messages from the alarm notifications queue first.

Answer

D. Create a queue for alarm notifications and a queue for information notifications. Update the application to collect messages from the alarm notifications queue first.

Explanation

The correct answer is D. Create a queue for alarm notifications and a queue for information notifications. Update the application to collect messages from the alarm notifications queue first.

This solution can meet the requirements because:

• It can prioritize alarm notifications over information notifications. By creating two separate queues for different types of notifications, you can ensure that the alarm notifications are not mixed with the information notifications. By updating the application to collect messages from the alarm notifications queue first, you can ensure that the EC2 instances process the alarm notifications before the information notifications. This way, you can reduce the latency and increase the reliability of handling the alarm notifications, which are more urgent and critical than the information notifications.
• It can leverage the existing Amazon SQS service and its features. Amazon SQS is a service that provides scalable and secure message queues for your applications. You can use Amazon SQS to store and retrieve any amount of messages from multiple sources and destinations. You can also use Amazon SQS features, such as dead-letter queues, message retention, and visibility timeout, to manage your message delivery and processing.
• It does not require any additional services or configurations. This solution uses only one AWS service: Amazon SQS. You do not need to use any other services, such as Amazon SNS, Amazon DynamoDB, or Auto Scaling, to implement this solution. You only need to create and configure two queues in Amazon SQS and update your application logic to collect messages from the appropriate queue.

The other options are incorrect because:

• Option A is incorrect because adjusting the Auto Scaling group to scale faster when a high number of messages is in the queue would not prioritize alarm notifications over information notifications. Auto Scaling is a service that allows you to automatically adjust the number of EC2 instances in your application based on demand or performance. You can use Auto Scaling to scale your EC2 instances faster when there are many messages in the queue, which can improve your overall throughput and availability. However, this solution would not differentiate between alarm notifications and information notifications. The EC2 instances would process the messages in the order they arrive in the queue, regardless of their type or importance.
• Option B is incorrect because using the Amazon SNS fanout feature with Amazon SQS to send the notifications in parallel to all the EC2 instances would not prioritize alarm notifications over information notifications. Amazon SNS is a service that allows you to send messages to multiple subscribers using topics. You can use the SNS fanout feature to send a message to multiple Amazon SQS queues in parallel, which can increase your message delivery speed and reliability. However, this solution would not differentiate between alarm notifications and information notifications. The EC2 instances would receive all types of messages at the same time, regardless of their type or importance.
• Option C is incorrect because adding an Amazon DynamoDB stream to accelerate the message processing would not prioritize alarm notifications over information notifications. Amazon DynamoDB is a service that provides fast and flexible NoSQL database tables. You can use DynamoDB streams to capture changes made to your DynamoDB tables in near real time. However, this solution would not differentiate between alarm notifications and information notifications. The DynamoDB stream would capture all types of messages that are stored in your DynamoDB table, regardless of their type or importance.

Therefore, the best solution to implement a solution that prioritizes alarm notifications over information notifications is to create a queue for alarm notifications and a queue for information notifications, and update the application to collect messages from the alarm notifications queue first.

Reference

• Amazon SQS queue types – Amazon Simple Queue Service
• amazon web services – Get SQS message from a priority queue – Stack Overflow
• amazon web services – How to implement a priority queue architucture using lambda and SQS? – Stack Overflow
• Amazon SQS Features | Message Queuing Service | AWS
• python – How to implement a priority queue using SQS(Amazon simple queue service) – Stack Overflow

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