ExpertMedium1 markMultiple Choice
AWS SAA-C03 · Question 31 · Domain 2.3: Decoupling
A company is designing a microservices architecture. Service A needs to publish events that are consumed by Service B and Service C. Service B processes events immediately, while Service C batches them and processes them hourly. If Service C is down, events must not be lost. <br/><br/>Which TWO AWS services should be combined to build this architecture? (Select TWO.)
A company is designing a microservices architecture. Service A needs to publish events that are consumed by Service B and Service C. Service B processes events immediately, while Service C batches them and processes them hourly. If Service C is down, events must not be lost. <br/><br/>Which TWO AWS services should be combined to build this architecture? (Select TWO.)
Answer options:
A.
Amazon SNS
B.
Amazon SQS
C.
AWS Step Functions
D.
Amazon Kinesis Data Firehose
E.
Amazon MQ
How to approach this question
Identify the 'fan-out' pattern, which uses SNS to publish to multiple SQS queues.
Full Answer
Amazon SNS<br/>Amazon SQS
This is the classic 'fan-out' pattern. Service A publishes a message to an Amazon SNS topic. Both Service B and Service C have their own Amazon SQS queues subscribed to that topic. SQS ensures the messages are buffered and not lost if a service is temporarily unavailable.
Common mistakes
Thinking SNS alone is enough. SNS does not buffer messages; if the consumer is down, the message is lost unless an SQS queue is used.
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