cloud-engineering
FIFO Queue
First-In, First-Out Queue
Definition
A FIFO queue guarantees that messages are processed exactly once and in the strict order they were sent. Unlike standard queues that offer best-effort ordering and at-least-once delivery, FIFO queues prevent duplicate processing and maintain sequence — critical for financial transactions, order management, and workflow orchestration.
AWS SQS FIFO queues and Azure Service Bus support FIFO semantics.
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