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Hi there!
What you're describing sounds more like there are a few messages that are repeatedly failing to process for some reason. If you don't have a redrive policy (https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-dead-letter-queues.html) defined for a FIFO queue, any messages that can't be processed will cycle back and forth between visible and invisible indefinitely.
If you're looking at metrics like ApproximateNumberOfMessagesNotVisible, it could look like it's staying elevated consistently, giving the impression that messages are staying invisible for a long time, when in truth there are several poison pills fluctuating back and forth.
What does ApproximateAgeOfOldestMessage look like for your queue?
Robin
answered 5 years ago
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