This document summarizes messaging with AWS, including using queues to decouple services and distribute workloads. It discusses properties of message queues like durability and asynchronicity. It provides examples of using AWS SQS and SNS for messaging, including configuring SQS for visibility timeouts and inflight messages, and using SNS for publish/subscribe messaging and mobile push notifications.

1. Messaging with AWS
AKASH KUSHWAHA

2. Agenda
- Queues
- Why use Queues
- How to use Queues

3. Message Queue

4. Properties
- Durability : Messages survive broker crashes.
- Asynchronicity : Sending message is asynchronous.
- Scalability : Queue should be able to scale as needed.

5. Message Sample

6. Decoupling Services

7. Decoupling Services..
- Message queue absorbs any increase in load.
- Consumers can scale smoothly without failing any request.
- Priority queues: Process request in order of importance.

8. Work Distribution
- Allow compute work to be distributed to a cluster of machines.
- Decouple cluster nodes from producer(s).
- Dynamic configuration.

9. Data pipelines
Chained processing:
Store intermediate data/header in queues.

10. AWS SQS
- Managed service. Queue as a service.
- Scalable
- Auto replication to AZs in a region
- Easy configuration
- Access management
- Plug and play Encryption
- Alarms with CloudWatch

11. Config
- Visibility timeout
- Inflight Messages
- Idempotent design
- Long polling

12. AWS FIFO Queue
- Inorder queue.
- Limited scaling.
- Scale with Message groups.

13. Publish–subscribe pattern
- Categorize messages into classes(Topics).
- Publisher push to topics.
- Scalability
- Flexible topology

15. AWS SNS
Simple Notification service.
Implementation of publish/subscribe messaging pattern.

16. Scaling with SNS

17. Sample Java
public Result processOrder(){
transaction1();
//sync or async
sendEmail();
sendSMSIfSubscribed();
pushToSlack();
updateAnalyticsDB(); //for live dashboard
pushToMobileApp();
}
public Result processOrder(){
transaction1();
pushToSNS();
}

18. SNS with SQS

19. Mobile Push Notifications

20. QnA
Thank you.