AWS Application Integration Services Flashcards

A consumer takes about 2 minutes to process each SQS message, but messages keep reappearing and get processed twice. The queue uses default settings. What is the most likely cause?

Answer: The default visibility timeout of 30 seconds is shorter than the processing time

If processing exceeds the visibility timeout (30 seconds by default), the message becomes visible again and another consumer can receive it.

What is the maximum message retention period you can configure for an Amazon SQS queue?

Answer: 14 days

SQS retains messages for 4 days by default and can be configured from 60 seconds up to 14 days.

A team wants to reduce empty responses and API costs when polling an SQS queue. What should they set, and what is its maximum value?

Answer: ReceiveMessageWaitTimeSeconds, up to 20 seconds

Long polling is enabled by setting ReceiveMessageWaitTimeSeconds greater than 0, with a maximum of 20 seconds.

An order-processing system uses an SQS FIFO queue. Orders for the same customer must be processed in order, but orders for different customers should be processed in parallel. What should the producer set?

Answer: A MessageGroupId equal to the customer ID

FIFO queues preserve ordering within each message group, and different message groups can be processed concurrently.

A developer needs every new message in an SQS queue to remain invisible to consumers for 10 minutes after it is sent. Which feature fits best?

Answer: Delay queue

A delay queue postpones delivery of all new messages for up to 15 minutes, so 10 minutes is supported.

Which setting determines how many times a message can be received before SQS moves it to a dead-letter queue?

Answer: maxReceiveCount in the redrive policy

The redrive policy's maxReceiveCount specifies the number of receives allowed before the message is moved to the DLQ.

Within what time window does an SQS FIFO queue discard a duplicate message that has the same deduplication ID?

Answer: 5 minutes

FIFO queues use a 5-minute deduplication interval; duplicates with the same deduplication ID sent within that window are not delivered.