- SQS stands for Simple Queue Service
- First AWS service (November 2024)
- Fully managed service (serverless)
- Used to decouple applications
- Scale seamlessly (from 1 message per second to 10K per second)
- Default retention of message is 4 days (maximum of 14 days)
- No limit how many messages can be in the queue
- Messages are deleted after they are read from the consumers
- Low latency (<10ms on publish and receive)
- Consumers share the work to read message & scale horizontally
In this scenario there are two layers, the web servers and the video processing, fully decoupled from the SQS queue and scaling independently.
When you have a normal SQS queue consumers can read messages altogether and they could be in different orders.
With Amazon SQS FIFO queues the message are going to be in order. So if you have a producer sending messages in a specific order then the consumer will also read these messages in order.
