Exam AWS-SysOps topic 1 question 82 discussion

SQS supports FIFO queue. https://aws.amazon.com/sqs/features/ Just that, other options are incorrect. (B) is the best answer. Especially (C), you don't need SWF to do this.

B https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/stand ard-queues.html A standard queue makes a best effort to preserve the order of messages, but more than one copy of a message might be delivered out of order. If your system requires that order be preserved, we recommend using a FIFO (First-In-First-Out) queue or adding sequencing information in each message so you can reorder the messages when they're received.

Correct Answer: B Since there's no option using FIFO Queues, Sequencing information is the only alternative.

You can use FIFO SQS (which is slower than normal SQS), but seeing as thats not an option.... then sequencing is your only alternative

A standard queue makes a best effort to preserve the order of messages, but more than one copy of a message might be delivered out of order. If your system requires that order be preserved, we recommend using a FIFO (First-In-First-Out) queue or adding sequencing information in each message so you can reorder the messages when they're received.

B. You can use sequencing information on each message

this is now sys ops quection

The tricky part of the question is "messages in the same sequence". Usually we think Delivery which means FIFO & Standard Method to deliver exactly once or at least once. But the requirement is sequence..