messageGroupId

FIFO topics: The tag that specifies that a message belongs to a specific message group. Messages that belong to the same message group are processed in a FIFO manner (however, messages in different message groups might be processed out of order). To interleave multiple ordered streams within a single topic, use MessageGroupId values (for example, session data for multiple users). In this scenario, multiple consumers can process the topic, but the session data of each user is processed in a FIFO fashion. You must associate a non-empty MessageGroupId with a message. If you do not provide a MessageGroupId, the action fails.

Standard topics: The MessageGroupId is optional and is forwarded only to Amazon SQS standard subscriptions to activate fair queues. The MessageGroupId is not used for, or sent to, any other endpoint types.

The length of MessageGroupId is 128 characters.

MessageGroupId can contain alphanumeric characters (a-z, A-Z, 0-9) and punctuation (!"#$%&'()*+,-./:;<=>?@[\]^_{|}~)`.