Learn Queues
Queues buffer work. At-least-once delivery permits duplicates.
Read each short explanation, work through the example, then answer a pop quiz. Every answer explains the reasoning. Incorrect answers unlock a fresh question on the same idea; the full lesson contains ten questions.
01Understand the basics
Ready to learnA queue buffers work between producers and workers. It helps absorb bursts and temporary outages, but it does not create processing capacity. At-least-once delivery means a job can arrive again, so workers must tolerate repeats.
02Balance throughput
Ready to learnCompare the arrival rate with total sustainable processing capacity. Equal rates leave no spare capacity to drain a backlog or absorb variability. Check downstream limits before adding workers.
Try a different value
03Handle poison messages
Ready to learnA message that always fails can consume retries indefinitely. Set a retry budget, capture the failure reason and move exhausted jobs to a dead-letter path for investigation and controlled replay.
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