SNS, SQS, Kinesis & ActiveMQ

Question 1

For standard queues, what is the default retention policy?

Answer 1

4 days

Question 2

For standard queues, what is the maximum retention policy?

Answer 2

14 days

Question 3

What is the max size limit of an SQS message?

Answer 3

256KB

Question 4

Can we have duplicate messages in SQS?

Answer 4

Yes, it is at least once delivery

Question 5

Will messages be in order?

Answer 5

It is best effort ordering

Question 6

How do consumers get messages from a queue?

Answer 6

Consumers poll the queues and can receive a max of 10 messages at a a time

Question 7

What is the main use case for SQS queues?

Answer 7

To decouple applications

Question 8

What are 3 things to know about SQS encryption?

Answer 8

• Use in-flight encryption using HTTPS API
• At-rest encryption using KMS keys
• Client side encryption if the client wants to encrypt/decrypt

Question 9

How do you control access to SQS?

Answer 9

Use IAM roles

Question 10

When would I use SQS Queue Access Policies?

Answer 10

When you need cross account access

Question 11

What is Message Visibility Timeout?

Answer 11

It is the time the consumer has to process the message before other consumers can see it again

Question 12

What is the default Visibility Timeout?

Answer 12

30 seconds

Question 13

How do you increase the default Visibility Timeout?

Answer 13

Use the ChangeMessageVisibility API

Question 14

What is a Delay Queue?

Answer 14

It is a queue that prevents consumers seeing messages until a time has elapsed

Question 15

What is the default time for Delay Queues?

Answer 15

It is 0 seconds - so they will see it straight away

Question 16

What is the maximum time I can set in a Delay Queue?

Answer 16

15 minutes

Question 17

How do I override the default time in a Delay Queue?

Answer 17

Use the DelaySeconds parameter

Question 18

What is long polling?

Answer 18

It is when a consumer waits for messages in the queue

Question 19

What is the advantage of long polling?

Answer 19

Reduces the amount of API calls your app makes to SQS

Question 20

What can the wait time be for long polling?

Answer 20

It can be between 1 and 20 seconds, but 20 seconds is preferred

Question 21

What are the 2 ways to enable Long Polling?

Answer 21

• At the queue level

- Via API using WaitTimeSeconds

Question 22

What is the SQS Temporary Queue Client?

Answer 22

It allows you to leverage virtual queues instead of creating/deleting SQS queues

Question 23

What are the 6 subscriber options for SNS?

Answer 23

• SQS
• HTTP/HTTPS
• Lambda
• Emails
• SMS Messages
• Mobile Notifications

Question 24

What are the 3 encryption options for SNS?

Answer 24

• In-flight encryption using HTTPS API
• At-rest encryption using KMS keys
• Client side encryption if client wants to handle encrypt/decrypt

Question 25

What is the SNS + SQS fan out strategy?

Answer 25

Its when you push once to SNS, receive in all SQS queues that are subscribers

Question 26

Does a subscriber receive all messages from SNS?

Answer 26

If there is no Message Filtering setup, they will receive all messages

Question 27

What is Kinesis used for?

Answer 27

It is for collecting, processing and analyzing real-time streaming data

Question 28

What are the 4 types of Kinesis?

Answer 28

- Kinesis Data Streams - Kinesis Data Firehose - Kinesis Data Analytics - Kinesis Video Streams

Question 29

What 2 things make up a Record in Kinesis?

Answer 29

- Partition Key | - Data Blob

Question 30

How big can a data blob be in a Kinesis Message?

Answer 30

Up to 1MB

Question 31

How much can a shard process in Kinesis?

Answer 31

- 1 MB per second | - 1000 messages per second

Question 32

Is the Kinesis Record the same when the Consumer picks it up?

Answer 32

It has an additional key, the Sequence Number, along with the Partition Key and the Data Blob

Question 33

What are the 2 types of Kinesis Consumer?

Answer 33

- Shared | - Enhanced

Question 34

How much can the shared consumer process?

Answer 34

2MB per second per shard - ALL consumers

Question 35

How much can an enhanced consumer process?

Answer 35

2MB per second per shard per consumer

Question 36

What is the default data retention in a Kinesis shard?

Answer 36

1 day

Question 37

What is the max data retention in a Kinesis shard?

Answer 37

365 days

Question 38

Can we delete Kinesis data after it is written?

Answer 38

No, its immutable

Question 39

When Kinesis Firehouse performsBatch Writes, what are the 3 possible AWS destinations?

Answer 39

- AWS S3 - AWS RedShift - AWS ElasticSearch

Question 40

What is Kinesis Data Analytics used for?

Answer 40

To perform real-time analytics on Kinesis Streams using SQL

Question 41

What is Amazon MQ?

Answer 41

It is a managed ApacheMQ