Lambda Triggers

5 minutes 5 Questions

Lambda Triggers are the AWS services or resources that can invoke or start an AWS Lambda function on specific events. These services include Amazon S3, Amazon DynamoDB, Amazon Kinesis, and various other AWS resources. The Lambda function accepts an event in JSON format that contains information related to the triggering event, which helps the function to process the data as per the requirement. Using Lambda triggers allows you to create event-driven processing pipelines, serverless data processing, and decouple your application components to improve the scalability and manageability of your applications.

Guide to AWS Lambda Triggers

What is AWS Lambda Triggers:
AWS Lambda Triggers are components that start the function's execution. Triggers could be changes in data state, system state, user action, or from other AWS services.

Why Lambda Triggers are important:
Lambda triggers are vital because they allow for automatic scaling, running code in response to certain triggers, and creating a seamless system of tasks that work in response to changes in your AWS environment.

How AWS Lambda Triggers work:
The Lambda Triggers are essentially components that start the execution of Lambda Functions. For instance, if an image is uploaded to an S3 bucket serving as a trigger, AWS Lambda could be configured to automatically create a thumbnail of that image.

Exam Tips: Answering Questions on Lambda Triggers:
1. Understand the different triggers and their application.
2. Know the AWS services that can be used as a trigger.
3. Familiarize yourself with coding a Lambda function for a certain trigger.
4. Comprehend the behavior of Lambda function when triggered.
5. Be aware of the permissions needed for a trigger to successfully launch a function.

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Question 1

A company wants to analyze logs from various AWS services such as Amazon S3 and AWS CloudTrail. Which Lambda trigger can be utilized to start the log processing?

Amazon S3 CloudWatch Logs AWS Config CloudWatch Events

Correct Answer: CloudWatch Logs

AWS Lambda can be triggered by CloudWatch Logs to process the logs in real-time. CloudWatch Events are for change-based triggers, AWS Config is for configuration management, while S3 and CloudFront are for object storage and content delivery. API Gateway is not applicable for the log analysis scenario.

Question 2

A retailer uses image recognition on user photos to show them fashion suggestions. Which Lambda trigger is best to process uploaded images from S3?

API Gateway AWS Step Functions Amazon SQS Amazon S3

Correct Answer: Amazon S3

AWS Lambda can be triggered when an image is uploaded to Amazon S3, enabling the processing of the uploaded image. Step Functions are for state machines, SQS is for messaging, API Gateway is for RESTful APIs, CloudFront is for content delivery, and Cognito is for user authentication.

Question 3

A company with a new gaming app needs to store user scores in real-time. Which AWS Lambda trigger should be used to store the data in the DynamoDB table?

Amazon S3 Amazon Kinesis Data Streams Amazon DynamoDB Streams Amazon SQS

Correct Answer: Amazon Kinesis Data Streams

To write scores in real-time, a streaming data source like Amazon Kinesis Data Streams can be used as a trigger to AWS Lambda, which can then store data in DynamoDB. Amazon SQS is used for distributed messaging, S3 and CloudFront are for storage and content delivery, DynamoDB Streams can only be triggered by changes in DynamoDB, and Step Functions is for state machines coordination.

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