Day 9 - Modern Application Architectures on AWS Part 1

Your application polls an Amazon Simple Queue Service (Amazon SQS) queue frequently and returns immediately, often with empty ReceiveMessageResponses. What is one thing that can be done to reduce Amazon SQS costs?

• Pricing on Amazon SQS does not include a cost for service requests; therefore, there is no concern.

• Increase the timeout value for short polling to wait for messages longer before returning a response.

• Change the message visibility value to a higher number

• Use long polling by supplying a WaitTime Seconds of greater than 0 seconds when calling ReceiveMessage.

What is the longest configurable message retention period for Amazon Simple Queue Service (Amazon SQS)?

• 30 minutes

• 4 days

• 30 seconds

• 14 days

A web application allows customers to upload orders to an S3 bucket. The resulting Amazon S3 events trigger a Lambda function that inserts a message to an SQS queue. A single EC2 instance reads messages from the queue, processes them, and stores them in an DynamoDB table partitioned by unique order ID. Next month traffic is expected to increase by a factor of 10 and a Solutions Architect is reviewing the architecture for possible scaling problems. Which component is MOST likely to need re-architecting to be able to scale to accommodate the new traffic?

• Lambda Function

• SQS Queue

• EC2 Instance

• DynamoDB Table

You have an application that has a requirement to process transactions in the form of messages that need to be processed in order, ideally, at a rate of 1000 messages per second. The order by which the messages are processed is critical, and messages need to be processed only once. What AWS service can you use to accomplish this without expending a lot of development time?

• Amazon SQS FIFO Queue

• Amazon SNS Topic

• AWS Lambda

• Amazon SQS Standard Queue

Of the following options, what is an efficient way to fanout a single Amazon Simple Notification Service (Amazon SNS) Message to multiple Amazon Simple Queue Service (Amazon SQS) queues?

• Create an Amazon SNS topic using Amazon SNS. Then create and subscribe multiple Amazon SQS queues to the Amazon SNS topic.

• Create one Amazon SQS queue that subscribes to multiple Amazon SNS topics.

• Amazon SNS allows exactly one subscriber to each topic, so fanout is not possible.

• Create an Amazon SNS topic using Amazon SNS. Create an application that subscribes to that topic and duplicates the messages. Send copies to multiple Amazon SNS queues.

You are working with your application development team and have created an Amazon Simple Queue service (Amazon SQS) standard queue. Your developers are complaining that messages are being processed more than once. What can you do to limit or stop this behavior?

• Have the developers make their application idempotent.

• Deploy a First-In, First-Out (FIFO) queue and have the developers point their application to it.

• Increase the visibility timeout on the queue.

• Adjust the size of the Amazon Elastic Compute Cloud fleet.

You are looking to use Amazon Simple Notification Service (Amazon SNS) to send alerts to members of your operations team. What protocols does Amazon SNS support? Choose all that apply.

• HTTP/HTTPS

• SQL

• Email-JSON

• Amazon SQS

You are designing a new application, and you are trying to decide between the different AWS services to use to achieve this goal. Your requirements are that messages between your application components may not be delivered more than once, tasks must be completed in either a synchronous or asynchronous fashion, and there must be some form of application logic that decides what to do when tasks have been completed. What application service should you use?

• Amazon Simple Queue Service (Amazon SQS)

• Amazon Simple Workflow Service (Amazon SWF)

• Amazon Simple Storage Service (Amazon S3)

• Amazon Simple Email Service (Amazon SES)

In Amazon Simple Workflow Service (Amazon SWF), a decider is responsible for what?

• Executing each step of the work

• Defining work coordination logic by specifying work sequencing, timing and failure conditions

• Initiating your workflow

• Registering activities and workflow with Amazon SWF

You want to design an application that sends a status email every morning to the system administrators. Which option will work?

• Create an Amazon SQS queue. Subscribe all the administrators to this queue. Set up an Amazon CloudWatch event to send a message on a daily cron schedule into the Amazon SQS queue.

• Create an Amazon SNS topic. Subscribe all the administrators to this topic. Set up an Amazon CloudWatch event to send a message on a daily cron schedule to this topic.

• Create an Amazon SNS topic. Subscribe all the administrators to this topic. Set up an Amazon CloudWatch event to send a message on a daily cron schedule to an AWS Lambda function that generates a summary and publishes it to this topic.

• Create an AWS Lambda function that sends out an email to the administrators every day via SMTP.