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Simple Queue Service

• Public, Fully Managed, Highly-Available Queues – Standard or FIFO
• Standard guarentee at least one delivery, order is not maintained, FIFO guarantee exactly once, order is maintained
• Messages up to 256KB in size – link to large data
• Received messages are hidden (VisibilityTimeout) then either reappear (re-try) or are explicitly deleted
• Dead-Letter queues can be used for problematic message
• ASG can scale and Lambdas invoke based on queues length
• SQS billed on ‘request’, 1 request = 1-10 messages up to 64KB total
• Encryption at rest & in-transit

SQS Standard vs FIFO:

FIFO:

• FIFO is 300 TPS w/o Batching, 3000 with
• need FIFO suffix for FIFO
• message is delivered exactly once

Standard:

• Standard is like multilane highway, near unlimited TPS
• faster
• order is not guarenteed
• message can be delivered more than once

SQS Delay Queues:

• make message hidden for x amount of seconds when added to the queue
• this is unlike VisibilityTimeout where message is hidden upon being received by consumer

SQS Dead-Letter Queues:
Imagine process that keeps failing, we need a way of handling this, this is where Dead-Letter Queue comes in. When ReceiveCount > maxReceiveCount & message isn’t deleted, it’s moved to Dead-Letter Queues.