Design Retries and a Dead Letter Path · System Design Interview

Design Retries and a Dead Letter PathDesign what happens to a message a consumer cannot process — how often it is retried, where it ends up, and how an engineer gets it moving again.What it has to do

Retry a failed message, backing off between attempts

Move a message that keeps failing off the main queue

An engineer can inspect a parked message and put it back

Scale

Messages per day: 2 billion

Share that fail at least once: 0.5%

Out of scope

The broker itself

What the consumer does with a message

Alerting and on-call routing

Practise this challengeAll system design challenges

LetsDiscuss

Loading your session…