Using the Amazon SQS message group ID

MessageGroupId is 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).

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Document Conventions

Working with visibility timeouts in Amazon SQS

Interleaving multiple ordered message groups in Amazon SQS