Serverless and Application Services Flashcards
1
Q
Are SQS messages ordered when using standard queues?
A
No, messages can arrive in a different order than received.
2
Q
Do SQS standard queues support at-least-once deliver, exactly-once, or both?
A
At-least-once. FIFO queues must be used for exactly-once type behavior.
3
Q
When a client polls a queue and receives a message, what happens to the message itself?
A
It is hidden in the queue, preventing other clients from receiving the message, until the client either deletes the message (usually indicating a successful processing) or the VisibilityTimeout elapses, in which case they re-appears in the queue for retries.
