Cloud Integrations

Question 1

Types of application communication

Answer 1

• Synchronous
  app to app
• Asynchronous (event based)
  app to queue to app

Question 2

Asynchronous Communication Pro/Con

Answer 2

• Sudden spikes in traffic can cause issues
• Services can scale independently

Question 3

SQS (Simple Queue Service)

Answer 3

• Decouple applications
• Fully managed (serverless)
• Default retention 4 days (max 14)
• No limit on # of messages in queue
• Messages are deleted after they’re read
• Low latency (<10ms)
• Consumers share the work to read messages & scale horizontally
• FIFO

Question 4

Kinesis

Answer 4

Real-time big data streaming (asynchronous)

Question 5

SNS (Simple Notification Service)

Answer 5

• Decouple apps
• Sent to one queue which send to many recipients
• Event publisher sends message to a SNS topic
• Event subs listen to the SNS topic notifications
• Each sub gets all messages from that topic
• Each topic can have 12 mil subs
• Each account limited to 100k topics
• Notification

Question 6

Amazon MQ

Answer 6

• SQS and SNS are cloud native service proprietary protocols from AWS
• When migrating to cloud instead of re-engineering the application to use SQS/SNS, you can use Amazon MQ
• Managed message broker service for
  Rabit MQ
  ActiveMQ