How reliable is AWS SQS?

Reliability – Amazon SQS locks your messages during processing, so that multiple producers can send and multiple consumers can receive messages at the same time. Customization – Your queues don’t have to be exactly alike—for example, you can set a default delay on a queue.

What happens when SQS fails?

SQS makes it easy to store, receive, and send messages between software components. Messages that are successfully processed are removed and failed messages are forwarded to the DLQ or returned to the queue. There is no need to explicitly configure these steps inside a Lambda function.

How long can you keep your Amazon SQS messages in Amazon SQS queues?

Q: How long can I keep my messages in Amazon SQS message queues? Longer message retention provides greater flexibility to allow for longer intervals between message production and consumption. You can configure the Amazon SQS message retention period to a value from 1 minute to 14 days. The default is 4 days.

What happens if there is no Dlq?

If a message cannot be delivered or returned, it is put on to the dead-letter queue (DLQ). If the dead-letter queue is not available, the sending MCA leaves the message on the transmission queue, and the channel stops. On a fast channel, nonpersistent messages that cannot be written to a dead-letter queue are lost.

What is a dead-letter queue in Amazon SQS?

A dead-letter queue is an Amazon SQS queue that an Amazon SNS subscription can target for messages that can’t be delivered to subscribers successfully. Messages that can’t be delivered due to client errors or server errors are held in the dead-letter queue for further analysis or reprocessing.

What is message retention period in SQS?

You can configure the Amazon SQS message retention period to a value from 1 minute to 14 days. The default is 4 days. Once the message retention quota is reached, your messages are automatically deleted.

What’s the longest a sent message can stay in an SQS queue?

14 days
According to documentation the maximum SQS message retention period( MessageRetentionPeriod ) is 14 days. After that time message will be deleted from the queue.