Lambda concurrency and throttling in AWS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the reserved concurrency limit for an AWS Lambda function.

AWS

aws lambda put-function-concurrency --function-name MyFunction --reserved-concurrent-executions [1]

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

Aunlimited

B-1

C0

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'unlimited' which is not accepted as a number.

Setting reserved concurrency to 0 disables the function.

The reserved concurrency must be a positive integer to limit concurrent executions. '10' sets the limit to 10 concurrent executions.

2fill in blank

medium

Complete the code to check the current concurrency limit of a Lambda function.

AWS

aws lambda get-function-concurrency --function-name [1]

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

AYourFunction

BLambdaFunc

CMyFunction

DFunction1

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong or misspelled function name.

Confusing function name with ARN.

The command requires the exact function name. 'MyFunction' matches the example function used.

3fill in blank

hard

Fix the error in the command to remove the reserved concurrency limit from a Lambda function.

AWS

aws lambda [1] --function-name MyFunction

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

Anull

Bdelete-function-concurrency

C0

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'put-function-concurrency --reserved-concurrent-executions 0' which disables the function.

Using 'null' or 'None' which cause errors.

Use 'delete-function-concurrency' to remove the reserved concurrency configuration, allowing the function to use the full account concurrency limit.

4fill in blank

hard

Fill both blanks to set the reserved concurrency limit to 1000 for a Lambda function (causing throttling beyond 1000 concurrent invocations).

AWS

aws lambda put-function-concurrency --function-name MyFunction --[2] [1]

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

A1000

Bthrottle

Creserved-concurrent-executions

Dconcurrency-limit

Attempts:

3 left

💡 Hint

Common Mistakes

Using invalid parameter names like 'throttle' or 'concurrency-limit'.

Confusing with provisioned concurrency parameters.

The command sets --reserved-concurrent-executions 1000 to limit the function to 1000 concurrent executions.

5fill in blank

hard

Fill all three blanks to create a CloudWatch alarm that triggers when Lambda throttling exceeds 5 errors in 1 minute.

AWS

aws cloudwatch put-metric-alarm --alarm-name LambdaThrottleAlarm --metric-name Throttles --namespace AWS/Lambda --statistic [1] --period [2] --threshold [3] --comparison-operator GreaterThanThreshold --evaluation-periods 1 --alarm-actions arn:aws:sns:us-east-1:123456789012:NotifyMe

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

ASum

BAverage

C60

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Average' instead of 'Sum' which may not catch total throttles.

Setting threshold too high or too low.

The alarm uses the 'Sum' statistic over a 60-second period and triggers when throttles exceed 5.