SQS_Overview.md

SQS Architecture

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• Exam Tips:

  • Public, Fully managed, highly-available queues - Standard or FIFO.
  • Messages up to 256KB in size - link to large data.
  • Received messages are hidden (VisibilityTimeout)
    • The messages either reappear (retry) or are explicitly deleted.
  • Dead-Letter queues can be used for problem messages.
  • Allows for distributed/decoupled application components.
  • ASG can grow based on queue size.
  • Lambda functions can replace the role of worker instances, polling and processing messages.
  • Default visibility timeout =
  • Message retention period =
  • Not designed for multiple consumers per queue.
    • Kinesis does allow multiple consumers.
  • Lookout for SQS fanout questions:
    • 1 SNS topic, with multiple subscribers (SQS queues) message will be added into each of the queues.