A Cantrill - Serverless, Event driven architectures

Question 1

What are the issues with Monolithic Architectures?

Answer 1

Fails Together, Scales Together, Bills Together.

Higher likelihood of failure, More difficult to scale effectively AND its cost ineffective.

Question 2

What is the Lambda function timeout?

Answer 2

15 minutes.

Question 3

What are the 2 networking modes for Lambda?

Answer 3

Public and VPC based (private)

Question 4

What are Lambda execution roles?

Answer 4

IAM roles attached to the lambda functions which control PERMISSIONS the Lambda function RECEIVES.

Question 5

What is a Lambda resource policy?

Answer 5

Controls WHAT services and accounts can INVOKE a Lambda function.

Question 6

What does services does Lambda use for Logging and monitoring?

Answer 6

CloudWatch, CW logs, and X-Ray (distributed tracing)

Question 7

What does CloudWatch Logs require for Lambda to work with it?

Answer 7

CW Logs require permissions via Execution role for Lambda.

Question 7

What is Lambda Provisioned concurrency ?

Answer 7

AWS will create and keep a # of contexts (runtime, configuration) warm and ready to use. Improves speed.

Question 7

What is the difference between cold and warm start in Lambda?

Answer 7

Cold start builds the lambda environment from scratch (runtime, config).
Warm start occurs when a lambda reuses the environment from another previously run Lambda (saves time)

Question 7

What is the new version of CloudWatch Events?

Answer 7

EventBridge is the new version of CloudWatch Events.

Question 8

EventBridge can have additional event busses that can support non AWS (3rd party, onprem) services? T or F

Answer 8

True. EventBridge can incorporate 3rd party or onprem services in a bus.

Question 9

Under what service will you find “State Machines”?

Answer 9

State Machines are located under Step Functions.

Question 10

What is 400 error?

Answer 10

Bad Request, Generic

Question 11

What is 403 error?

Answer 11

Access Denied, Authorizer denied.

Question 12

What is 429 error?

Answer 12

Throttling error

Question 13

503?

Answer 13

Service unavailable

Question 13

What is a 502 error

Answer 13

bad gateway. Lambda returned bad output

Question 15

What is the largest size of message that SQS can handle?

Answer 15

256kb is the largest message that SQS handles.

Question 16

What is needed for multiple queues for SQS fanout?

Answer 16

SQS topic. One message goes to The topic then fans out to to multiple queues.

Question 17

what suffix must a message have for FIFO in sqs?

Answer 17

.fifo suffix

Question 18

What is Dead letter queue?

Answer 18

Dead letter queues allow for messages which are causing repeated processing errors to be moved into a dead letter queue

Question 19

What is Kinesis Data stream?

Answer 19

Kinesis data streams are a streaming service within AWS designed to ingest large quantities of data and allow access to that data for consumers.

Question 20

What is KDS?

Answer 20

Kinesis Data Firehose is a stream based delivery service capable of delivering high throughput streaming data to supported destinations in near realtime

Question 21

what is Amazon Kinesis Data Analytics?

Answer 21

Amazon Kinesis Data Analytics is the easiest way to analyze streaming data, gain actionable insights, and respond to your business and customer needs in real time.

Question 22

What does Cognito do?

Answer 22

Authentication, Authorization, and user mgmt for web/mobile apps. User pools have sign-in and deliver JWT (JSON Web Token). Also provide sign in for 3rd parties (Facebook, google) Does NOT in itself allow AWS access. But with Identity pools, it does.

Question 23

What is AWS Glue?

Answer 23

AWS Glue is a SERVERLESS, fully managed extract, transform, and load (ETL) service that makes it easy for customers to prepare and load their data for analytics

Question 24

What is a simple difference between SNS and SQS?

Answer 24

SNS provides TOPICS. SQS provided QUEUES.

Question 25

When should you use Amazon MQ?

Answer 25

If you need to migrate from existing system with little to no change to application change. If message API protocols are needed - AMQP, MQTT, Openwire, etc

Question 26

What is Appflow?

Answer 26

Amazon AppFlow is a fully managed integration service that enables you to securely transfer data between Software-as-a-Service (SaaS) applications like Salesforce, SAP, Zendesk, Slack, and ServiceNow, and AWS services like Amazon S3 and Amazon Redshift, in just a few clicks.

Question 27

Which configuration value controls how long something has to process and delete a queue message before it reappears?

Answer 27

Visibility Timeout.

Question 28

If you are trying to decouple a super high volume application you should use what AWS product?

Answer 28

SQS Standard Queue.

Question 29

Which architecture should be used when one event needs to initiate multiple workflow processes?

Answer 29

SNS + SQS Fanout.

Question 30

What is a period of time during which the SQS queue prevents other consuming components from receiving and processing a message?

Answer 30

Visibility Timeout.

Question 31

What is the default message retention policy for SQS?

Answer 31

Amazon SQS automatically deletes messages that have been in a queue for more than the maximum message retention period.

Question 32

What is the default message retention period for SQS?

Answer 32

The default message retention period is 4 days

Question 33

What is Amazon SWF?

Answer 33

Amazon SWF is a web service that makes it easy to coordinate work across distributed application components.

Question 34

Is "polling" a SNS topic supported in SNS?

Answer 34

polling is NOT supported in SNS. Topics (instead) subscribe

Question 35

What component of SNS or SQS will perform 'polling'?

Answer 35

The consumers of messages from a SQS queue will "poll" the queue

Question 36

What is amazon Kinesis?

Answer 36

Amazon Kinesis makes it easy to collect, process, and analyze real-time, streaming data so you can get timely insights and react quickly to new information.

Question 37

How do messages in SQS queue get deleted?

Answer 37

The consumer must delete the message from the queue after receiving and processing it. ***When a consumer receives and processes a message from a queue, the message remains in the queue. Amazon SQS doesn’t automatically delete the message.***

Question 38

How does SQS prevent multiple consumers from processing a message?

Answer 38

Amazon SQS sets a visibility timeout, a period of time during which Amazon SQS prevents other consumers from receiving and processing the message. The default visibility timeout for a message is 30 seconds. The maximum is 12 hours.