Cloud Integration Section

Question 1

Amazon SQS – Standard Queue

Answer 1

• Fully managed service (~serverless), use to decouple applications
• Scales from 1 message per second to 10,000s per second
• Default retention of messages: 4 days, maximum of 14 days
• No limit to how many messages can be in the queue
• Messages are deleted after they’re read by consumers
• Low latency (<10 ms on publish and receive)
• Consumers share the work to read messages & scale horizontally

Question 2

Amazon SNS

Answer 2

• The “event publishers” only sends message to one SNS topic
• As many “event subscribers” as we want to listen to the SNS topic notifications
• Each subscriber to the topic will get all the messages
• Up to 10,000,000 subscriptions per topic, 100,000 topics limit

SNS Subscribers can be:
• HTTP / HTTPS (with delivery retries – how many times)
• Emails, SMS messages, Mobile Notifications
• SQS queues (fan-out pattern), Lambda Functions (write-your-own integration)

Question 3

Amazon Kinesis

Answer 3

• For the exam: Kinesis = real-time big data streaming
• Managed service to collect, process, and analyze real-time streaming
data at any scale

Question 4

Amazon MQ

Answer 4

• Traditional applications running from on-premise may use open protocols such as: MQTT, AMQP, STOMP, Openwire, WSS
• When migrating to the cloud, instead of re-engineering the application to use SQS and SNS, we can use Amazon MQ
• Amazon MQ = managed Apache ActiveMQ
• doesn’t “scale” as much as SQS / SNS
• runs on a dedicated machine (not serverless)
• has both queue feature (~SQS) and topic features (~SNS)