Dead Letter Queue
What
handle message failure
A queue which other queues (source queues) can target for messages that cannot process (be consumed) successfully.
Uses
to set aside and isolate messages that cannot be processed correctly to determine why their processes failed
Instead of trying to process messages that fail until they expire, move them to a dead-letter queue after a few process attempts.
This can reduce load on consumer/queue having to constantly retry the message, save costs if managed service
troubleshoot incorrect message transmission operations.
Examples
Configure an alarm for any messages delivered to a dead-letter queue
Examine logs for exceptions that might have caused messages to be delivered to a dead-letter queue.
Analyze the contents of messages delivered to a dead-letter queue to diagnose software or the producer’s or consumer’s hardware issues
Determine whether you have given your consumer sufficient time to process messages
Not to use
to decrease the number of messages and to reduce the possibility that you expose your system to messages that you can receive but cannot process.
with standard queues when you want to retry the transmission of a message indefinitely
with a FIFO queue if you do not want to break the exact order of messages or operations
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