Dead Letter Queue (DLQ)

Description

A service queue implementation to store messages that the messaging system cannot deliver to their destination or cannot be processed.

Where to use

• Debugging failed messages.
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• Preventing poison messages from blocking the system.

Real World Example

If a message fails to process 5 times, it is moved to the DLQ. DevOps can later inspect why it failed.

Code Example

class DeadLetterQueue(DLQ):\n    def __init__(self):\n        pass\n\n    def execute(self):\n        print('Executing Dead Letter Queue (DLQ)')