advancedKafka: Producer, Consumer & Idempotency131 of 469
A payment service's Kafka consumer lag jumps from 500 to 2 million messages in 30 minutes with unchanged producer throughput, and your SLA requires 5-second processing. How do you diagnose and fix it?
Tests whether you can reason through a real high-stakes production incident, not just recite the theory around lag.
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