On azure Event bus How much times takes from a letter go to a dead letter queue

Question

I'm testing an implementation of a retry policy of azure event bus, and my question is how much time after, a letter will go to the dead letter queue.

Thanks

Answer 1

Regarding when a message will be deadlettered, it's not a matter of time. It actually depends on 2 user configurable properties:

1. Number of times message has been dequeued: This is a property you define at the Queue level (or Subscription level in case of Topics & Subscription). Once a message has been dequeued that many times, it will be deadlettered. You control this by specifying appropriate value for MaxDeliveryCount property for a queue.
2. Should the message be deadlettered on expiration: Again, this is a property you define a queue level (or Subscription level in case of Topics & Subscription). If this property is set to true and message time-to-live (TTL) has expired, then the message will be deadlettered instead of being removed. You control this by specifying true/false for EnableDeadLetteringOnMessageExpiration property.

For Topics & Subscription, there's another way to deadletter a message and that is to set true to deadletter a message when there's an exception in filter expression evaluation property on a Subscription. You control this by specifying true/false for EnableDeadLetteringOnFilterEvaluationExceptions property.