Simple Queue Service Quiz
There is a requirement for 500 messages to be sent and processed in order. Which service can be used in this regard?
A. AWS SQS FIFO
B. AWS SNS
C. AWS Config
D. AWS ELB
A. AWS SQS FIFO
One can use SQS FIFO queues for this purpose. The AWS Documentation mentions the following on SQS FIFO Queues:
Amazon SQS is a reliable and highly-scalable managed message queue service for storing messages in transit between application components. FIFO queues complement the existing Amazon SQS standard queues, which offer high throughput, best-effort ordering, and at-least-once delivery. FIFO queues have essentially the same features as standard queues, but provide the added benefits of supporting ordering and exactly-once processing. FIFO queues provide additional features that help prevent unintentional duplicates from being sent by message producers or from being received by message consumers. Additionally, message groups allow multiple separate ordered message streams within the same queue.
For more information on SQS FIFO Queues, please visit the following URL:
https://aws.amazon.com/about-aws/whats-new/2016/11/amazon-sqs-introduces-fifo-queues-with-exactly-once-processing-and-lower-prices-for-standard-queues/
Note:
Yes, SNS is used to send out the messages.
SNS is a web service that coordinates and manages the delivery or sending of messages to subscribing endpoints or clients. In Amazon SNS, there are two types of clients—publishers and subscribers—also referred to as producers and consumers. Publishers communicate asynchronously with subscribers by producing and sending a message to a topic, which is a logical access point and communication channel. Subscribers (i.e., web servers, email addresses, Amazon SQS queues, AWS Lambda functions) consume or receive the message or notification over one of the supported protocols (i.e., Amazon SQS, HTTP/S, email, SMS, Lambda) when they are subscribed to the topic. There is no such thing like maintain the messages order in SNS.
In the question, it mentioned that “There is a requirement for 500 messages to be sent and processed in order”. By SNS all messages will send at the same time to all the subscribers.
Please refer following the link to get more information.
https://docs.aws.amazon.com/sns/latest/dg/welcome.html
