Lambda Functions Flashcards by Tammy Walters

How are you billed in Lambda?

1-millisecond increments

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High availability and Fault tolerance are two benefits of Lambda

True

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How does Lambda scale?

In response to events.

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What is an event driven Arc?

uses events to initiate actions and communication between decoupled services

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T/F Consumers know who the producer is?

False: they are only aware of the router.

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Who recieves events?

Those who subscirbe to them.

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Are Lamda functions stateful?

No,

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Synchronous Function

Synchronous events expect an immediate response from the function invocation

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What services invoke a synchronous function?

Amazon API Gateway
Amazon Cognito
AWS CloudFormation
Amazon Alexa
Amazon Lex
Amazon CloudFront

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asynchronous invocation

events are queued and the requestor doesn’t wait for the function to complete.

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What services invoke an asynchronous function?

Amazon SNS

Amazon S3

Amazon EventBridge

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Polling Invocation

poll (or watch) these services, retrieve any matching events, and invoke your functions

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What services invoke an polling function?

Amazon Kinesis
Amazon SQS
Amazon DynamoDB Streams

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What services can Lamda read for polling event source mapping?

Amazon DynamoDB

Amazon Kinesis

Amazon MQ

Amazon Managed Streaming for Apache Kafka (MSK)

self-managed Apache Kafka

Amazon SQS

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Cold Start

a new execution environment is required to run a Lambda function.

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Warm Start

the Lambda service retains the environment instead of destroying it immediately

Provisioned concurrency

is a Lambda feature that prepares concurrent execution environments before invocations, ensuring the lowest possible latency.

Permissions to invoke a lamda function are controlled how?

using an IAM resource-based policy

Permission to control what the function can to do within the other AWS services how?

using an IAM execution role

Trust Policy

A trust policy defines what actions your role can assume

What is needed for Lamda to access a VPC?

subnet IDs and security group IDs, and execution role permissions

How is PrivateLink used in Lamda Functions?

To establish a private connection between your VPC and Lambda, create an interface VPC endpoint

Ways to build Lamda Functions

You can author functions within the Lambda console, with an IDE toolkit, using command line tools, or using the AWS SDK

what is the Lamdba Console based on benefit?

Cloud9ide write, deploy, test

AWS SAM

open-source framework for building serverless applications (a fully detailed CloudFormation template)

AWS SAM CLI

launches a Docker container that you can interact with to test and debug your Lambda functions.

three configurations for Lamda functions

memory (up to 10g), timeout max is 900sec, and concurrency

Lambda Power Tuning

Powered by Step functions find the best configuration for a function supports three optimization strategies: cost, speed, and balanced

Lambda Concurrency types

UnReserved: (min 100) \ reserved provisioned (high perf low latency..ready to go

How do bursts scale

after initial burst (location dependent) by 500 every minute or until reached

Types of Code Deply Shifting Patterns

Canary Linear all at once

What does CloudWatch monitor by default for Lamda functions?

Number of requests Invocation duration per request Number of requests that result in an error

What can you monitor optionally for Lamdba functions through CloudWaltch?

Throttle (The number of times that a process failed because of concurrency limit) Iterator Age DeadLeterErrors concurrent executions

Amazon CloudWatch Lambda Insights

collects, aggregates, and summarizes system-level metrics

How do you use XRay to monitor Lamda Functions

Tuning performance Identifying the call flow of Lambda functions and API calls Tracing path and timing of an invocation to locate bottlenecks and failures