Dead letter queues in AWS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the dead letter queue ARN in the AWS SQS queue configuration.

AWS

QueueUrl = sqs.create_queue(QueueName='MyQueue', Attributes={'RedrivePolicy': '{"deadLetterTargetArn":"[1]"}'})

Drag options to blanks, or click blank then click option'

Aarn:aws:sqs:us-east-1:123456789012:MyDeadLetterQueue

Barn:aws:s3:::mybucket

Carn:aws:ec2:us-east-1:123456789012:instance/i-1234567890abcdef0

Darn:aws:lambda:us-east-1:123456789012:function:MyFunction

Attempts:

3 left

💡 Hint

Common Mistakes

Using an ARN for a different AWS service like S3 or Lambda.

Not providing the ARN in the RedrivePolicy attribute.

The dead letter queue ARN must point to an SQS queue. Here, option A is the correct ARN format for an SQS dead letter queue.

2fill in blank

medium

Complete the code to set the maximum receive count before moving messages to the dead letter queue.

AWS

RedrivePolicy = '{"maxReceiveCount": [1], "deadLetterTargetArn": "arn:aws:sqs:us-east-1:123456789012:MyDeadLetterQueue"}'

Drag options to blanks, or click blank then click option'

A100

B0

C5

D-1

Attempts:

3 left

💡 Hint

Common Mistakes

Setting maxReceiveCount to zero or negative numbers.

Using a very high number that defeats the purpose of dead letter queues.

The maxReceiveCount must be a positive integer. Setting it to 5 means after 5 failed receives, the message moves to the dead letter queue.

3fill in blank

hard

Fix the error in the RedrivePolicy JSON string to correctly configure the dead letter queue.

AWS

RedrivePolicy = '{"maxReceiveCount": 3, "deadLetterTargetArn": [1]'

Drag options to blanks, or click blank then click option'

Aarn:aws:s3:::mybucket

Barn:aws:sqs:us-east-1:123456789012:MyDeadLetterQueue

C'arn:aws:sqs:us-east-1:123456789012:MyDeadLetterQueue'

D"arn:aws:sqs:us-east-1:123456789012:MyDeadLetterQueue"

Attempts:

3 left

💡 Hint

Common Mistakes

Not quoting the ARN string inside the JSON.

Using single quotes instead of double quotes inside JSON.

The ARN value inside the JSON string must be enclosed in double quotes to be valid JSON.

4fill in blank

hard

Fill both blanks to create a dead letter queue and attach it to the main queue.

AWS

dlq_url = sqs.create_queue(QueueName='DeadLetterQueue')
dlq_arn = sqs.get_queue_attributes(QueueUrl=dlq_url, AttributeNames=['[1]'])['Attributes']['[2]']

Drag options to blanks, or click blank then click option'

AQueueArn

BQueueUrl

CArn

DUrl

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Arn' instead of 'QueueArn' as attribute name.

Confusing QueueUrl and QueueArn in parameters.

To get the ARN of the dead letter queue, first get its URL (QueueUrl), then request the 'QueueArn' attribute.

5fill in blank

hard

Fill all three blanks to configure the main queue with a dead letter queue and max receive count.

AWS

dlq_arn = '[1]'
redrive_policy = '{"maxReceiveCount": [2], "deadLetterTargetArn": "[3]"}'
main_queue_url = sqs.create_queue(QueueName='MainQueue', Attributes={'RedrivePolicy': redrive_policy})

Drag options to blanks, or click blank then click option'

Aarn:aws:sqs:us-east-1:123456789012:DeadLetterQueue

B5

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up ARN strings and variables.

Using inconsistent ARN values between variables and policy.

The dead letter queue ARN is assigned to dlq_arn (option C). The maxReceiveCount is set to 5 (option B). The RedrivePolicy uses the ARN string (option A).