SQS FIFO Queues Advanced¶

Deduplication¶

• De-duplication interval is 5 minutes
• Two de-duplication methods:
  • Content-based deduplication: will do a SHA-256 hash of the message body
  • Explicitly provide a Message Deduplication ID

Message Grouping¶

• If you specify the same value of MessageGroupID in an SQS FIFO queue, you can only have one consumer, and all the messages are in order
• To get ordering at the level of a subset of messages, specify different values for MessageGroupID
  • Messages that share a common MessageGroupID will be in order within the group
  • Each Group ID can have different consumer (parallel processing)
  • Ordering across groups is not guaranteed