FIFO Queue
The First-In-First-Out (FIFO) Queue in Amazon SQS is designed to ensure that the order of messages sent is maintained as they are received and processed, meaning that the order of transactions or events remains consistent throughout the system. This type of queue ensures minimal delays and strict enforcement of ordering guarantees. Unlike standard queues, FIFO queues use a unique message deduplication ID to handle multiple producers sending the same message, enabling processing of each message once. It's crucial to use FIFO queues in applications that depend on the exact sequence and timing of events or transactions.
Guide: FIFO Queue in Amazon SQS for AWS Solution Architect Exam
What is FIFO Queue?
FIFO Queue stands for First-In-First-Out Queue in Amazon SQS (Simple Queue Service). This queue type allows you to exactly sequence messages in exactly the way they are sent and received, meaning every message sent through the FIFO Queue will be delivered in the same order to the receiver.
Importance
FIFO Queue is important as it helps in maintaining sequenced order, it supports message groups that allow multiple ordered message groups within a single FIFO Queue and assists the user in processing messages in the exact sequence they are received. It reduces cost by avoiding duplicate message processing, and unintentional sequencing.
Working of FIFO Queue
FIFO Queue works by keeping track of the order of every transaction. Messages are delivered in the order they are sent, and only once, eliminating the possibility of duplication. It has a high throughput of up to 300 transactions per second.
Exam Tips: Answering Questions on FIFO Queue
1. Understand and recall that FIFO queues maintain the order of messages.
2. Remember that FIFO Queue eliminates duplicates and ensures once-only delivery.
3. It supports message groups, with up to 300 transactions per second being an important throughput to remember.
4. Know the role FIFO Queue plays in cost reduction and error prevention in message sequencing.
5. In a FIFO Queue, a message is not received by another consumer until the first consumer's visibility timeout expires.
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