Simple Queue Service (SQS)

  • Pull-based queue used to decouple infrastructure
  • 256 KB message size limit, buy can use Java SDK to send larger payloads to S3
  • Retention period from one min to 14 days, defaults to four days
  • Visibility timeout is time message is invisible once read, limit of 12 hours
  • Long polling can reduce costs by not returning until a message arrives or timeout is reached
  • Types
    • Standard: no ordering guarantees, at-least-once delivery
    • FIFO: strong ordering, exactly-once delivery

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