You can use thisĪttribute to verify that Amazon SQS received the message correctly. Type: String MD5OfMessageSystemAttributesĪn MD5 digest of the non-URL-encoded message system attribute string. Amazon SQS URL-decodes the message before creating the MD5 digest. You can use this attribute to verify that Amazon SQS received the message correctly. Īn MD5 digest of the non-URL-encoded message body string. Process the queue, but the session data of each user is processed in a FIFOĪn MD5 digest of the non-URL-encoded message attribute string. (for example, session data for multiple users). Multiple ordered streams within a single queue, use MessageGroupId values Messages in different message groups might be processed out of order). That belong to the same message group are processed in a FIFO manner (however, The tag that specifies that a message belongs to a specific message group. This parameter applies only to FIFO (first-in-first-out) queues. MessageDeduplicationId can contain alphanumeric charactersįor best practices of using MessageDeduplicationId, see Using the MessageDeduplicationId Property in the Amazon SQS Developer The maximum length of MessageDeduplicationId is 128 characters. Interval, Amazon SQS can't detect duplicate messages.Īmazon SQS continues to keep track of the message deduplication ID even after the message is received and deleted. Is resent with the same MessageDeduplicationId after the deduplication If a message is sent successfully but the acknowledgement is lost and the message Message (this can be useful for troubleshooting delivery issues). The MessageDeduplicationId is available to the consumer of the Two messages are treated as duplicates and only one copy of the message is Same as the one generated for the first MessageDeduplicationId, the If you send one message with ContentBasedDeduplication enabledĪnd then another message with a MessageDeduplicationId that is the Identical content sent within the deduplication interval are treated asĭuplicates and only one copy of the message is delivered. When ContentBasedDeduplication is in effect, messages with MessageDeduplicationId overrides the generated If the queue has ContentBasedDeduplication set, your Queue doesn't have ContentBasedDeduplication set, the If you don't provide a MessageDeduplicationId and the MessageDeduplicationId using the body of the message If you aren't able to provide a MessageDeduplicationIdĪnd you enable ContentBasedDeduplication for your queue,Īmazon SQS uses a SHA-256 hash to generate the
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