Module 13

In this topology, the amount of requests to the backend can create a bottleneck of requests this crashing the servers. This is called Tight Coupling (three tier arhitecture)

• We want to decouple this architecture to loosen it up so nothing gets bottlenecked

Loosen like ur ...

Amazon Simple Queue Service (SQS)

• Is a fully managed message queueing service

• Helps integrate and decouple distributed software systems and application components

• Provides highly available, secure, and durable message-queueing capabilities

• Provides an AWS Management Console interface and a web services API

Wilmer said "remember for the exam"

• Visibility Timeout: After sending the first 5 messages(user-defined), it won't take requests from any other consumer for 30 seconds(user-defined)

• Max message size: 256kb - only sending metadata

SQS Components

Example:

Queue types

Standard Queue

• At-least-once delivery

• Best-effort ordering

• Nearly unlimited throughput

First in First Out (FIFO)

• Exactly once processing

• High throughput

SQS Operations

Amazon Simple Notification Service (SNS)

• Is a fully managed pub/sub messaging service

• Helps decouple applications through notifications

• Provides highly scalable, secure, and cost-effective notification capabilities

• Provides an AWS Management Console interface and a web services API

Types of SNS Subscribers

Example:

SNS and SQS Differences

SNS	SQS
Publisher -> Subcriber	Producer -> Consumer
One to many	One to one
Push (passive)	Pull (active)
Message persistence: NO	Message persistence: YES

Amazon MQ is a message broker service