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Links: 102 AWS DVA Index

Extended Client

  • How to send large messages? The size limit on messages is 256 KB.
  • We can upload the large message to S3 and use a pointer to the large message (small metadata message) as a message to SQS.
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Must Know API

  • CreateQueue(MessageRetentionPeriod), DeleteQueue
  • PurgeQueue: delete all the messages in queue
  • SendMessage(Delay Seconds), ReceiveMessage, DeleteMessage
  • MaxNumberOfMessages: default 1, max 10 (for ReceiveMessage API)
    • To receive a batch of messages.
  • ReceiveMessageWaitTimeSeconds: Long Polling
  • ChangeMessageVisibility: change the message timeout
  • Batch APIs for SendMessage, DeleteMessage, ChangeMessageVisibility helps decrease your costs.

FIFO Advanced

Message Deduplication

  • De-duplication interval is 5 minutes. This means that if you send the same message twice within the 5 minutes then the second message will be refused.
  • Two de-duplication methods:
    • Content-based deduplication: will do a SHA-256 hash of the message body
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    • Explicitly provide a MessageDeduplicationID

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
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    • Messages that share a common MessageGroupID will be in order within the group
    • Each Group ID can have a different consumer (parallel processing)
    • Ordering across groups is not guaranteed
  • This is useful when you don't need ordering of all the messages but want ordering of messages for a particular ID.
You can have as many consumers as MessageGroupID for your SQS FIFO queues.

Last updated: 2022-06-07