Key terms
The following key terms can help you better understand the functionality of FIFO queues. For more information, see the Amazon Simple Queue Service API Reference.
- Message deduplication ID
-
The token used for deduplication of sent messages. If a message with a particular message deduplication ID is sent successfully, any messages sent with the same message deduplication ID are accepted successfully but aren't delivered during the 5-minute deduplication interval.
Note
Amazon SQS continues to keep track of the message deduplication ID even after the message is received and deleted.
- Message group ID
-
The tag that specifies that a message belongs to a specific message group. Messages that belong to the same message group are always processed one by one, in a strict order relative to the message group (however, messages that belong to different message groups might be processed out of order).
- Receive request attempt ID
-
The token used for deduplication of
ReceiveMessage
calls. - Sequence number
-
The large, non-consecutive number that Amazon SQS assigns to each message.