Scaling - SQS

Question 1

What is SQS?

Answer 1

Simple Query Service is a reliable, scalable message queuing service

Question 2

What are some SQS features?

Answer 2

integrated with KMS; transient storage (default 4 days; max 14); support FIFO, 256Kb max message size; Java SQS SDK max message 2GB

Question 3

What is MQ?

Answer 3

manage version of Apache ActiveMQ; message broker which takes in messages and send them to systems that need them. similar to SQS; HA within region; ActiveMQ API

Question 4

MQ or SQS?

Answer 4

use SQS with new applications from scratch; use MQ to migrate from existing message brokers to AWS

Question 5

What is FIFO?

Answer 5

region specific, 3K Messages ps, used when message order is important

Question 6

What is standard queuing?

Answer 6

available in all regions, unlimited transactions ps, used when throughput is important

Question 7

What are message attributes?

Answer 7

metadata(timestamps, geolocation, signatures, IDs) that can be configured to be sent with messages

Question 8

price

Answer 8

You pay only for what you use; no minimum fee.

The cost of Amazon SQS is calculated per request, plus data transfer charges for data transferred out of Amazon SQS

Question 9

Availability?

Answer 9

HA, redundant AZs

Question 10

Security?

Answer 10

IAM for credentials; TLS/HTTPS for transport; AWS SSE for encrypted queues in select regions

Question 11

SNS vs SQS

Answer 11

both AWS messaging services; SNS pushes time sensitive messages to subscribers eliminating polling, SQS uses polling (pull) send/Receiver messages