Cloud Integration

Question 1

Amazon SQS – Simple Queue Service

Answer 1

• Queue service in AWS
• Oldest AWS offering (over 10 years old)
• 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
• FIFO = First In First Out (ordering of messages in the queue)
• Messages are processed in order by the consumer

Question 2

Amazon Kinesis

Answer 2

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

Too detailed for the Cloud Practitioner exam but good to know:
* Kinesis Data Streams: low latency streaming to ingest data at scale from hundreds of thousands of sources
* Kinesis Data Firehose: load streams into S3, Redshift, ElasticSearch, etc…
* Kinesis Data Analytics: perform real-time analytics on streams using SQL
* Kinesis Video Streams: monitor real-time video streams for analytics or ML

Question 3

Amazon SNS

Answer 3

• Notification service in AWS
• Subscribers: Email, Lambda, SQS, HTTP, Mobile…
• No message retention
• 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 12,500,000 subscriptions per topic, 100,000 topics limit
• Use case: send messages to many receivers

Question 4

Amazon MQ

Answer 4

• SQS, SNS are “cloud-native” services: proprietary protocols from AWS
• Traditional applications running from on-premises 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 is a managed message broker service for: RabbitMQ and ActiveMQ in the cloud (MQTT, AMQP.. protocols)
• Amazon MQ doesn’t “scale” as much as SQS / SNS
• Amazon MQ runs on servers, can run in Multi-AZ with failover
• Amazon MQ has both queue feature (~SQS) and topic features (~SNS)