Sqs queue and fifo7/30/2023 In my opinion SQS docs regarding exactly-once are a bit misleading, what do you think? Feel free to comment on Twitter.The commit on 26th Feb, 2020 adds the ability to use predefined queues. For example, update database with messages that were processed and check database whether new message was already processed before acting on it. If you want to use SQS FIFO queues and your service needs to guarantee that the same message is not processed twice you must implement idemponent processing mechanism. This certainly means that SQS FIFO queue can’t be fully relied on to prevent duplicate messages. So if SQS FIFO queue producer is down for more than 5 minutes because there’s a network issue and the same message is sent again then it actually will become duplicate (this point is also echoed in this excellent AWS article on SQS architecture where you can read more on AWS take regarding exactly-once semantics). If you retry the SendMessage action within the 5-minute deduplication interval, Amazon SQS doesn’t introduce any duplicates into the queue. AWS SQS FIFO Queues Simplified: The Ultimate Guide 101 - Learn Hevo In this article, you will learn about Amazon SQS and its benefits, SQS FIFO Queues, their features, and their limitations. The second caveat is that according to AWS SQS own docs: While Apache Kafka and Apache Kafka Streams offer exactly-once delivery AWS SQS offers exactly-once processing. The first thing to note here is the word processing. If you retry the SendMessage action within the 5-minute deduplication interval, Amazon SQS doesn’t introduce any duplicates into the queue. FIFO queues help you avoid sending duplicates to a queue. Unlike standard queues, FIFO queues don’t introduce duplicate messages. In its developer guide dedicated to exactly-once processing it says the following: I delved into AWS SQS docs for more details. This claim immediately caught my attention since it’s a quite bold claim. Duplicates aren’t introduced into the queue. The eye-catching feature of FIFO queue is its claim to exactly-once processing:Įxactly-Once Processing: A message is delivered once and remains available until a consumer processes and deletes it.
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