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Understanding Consumer Lag in Apache Kafka

Loretta Jones takes us through the notion of consumer lag in an Apache Kafka topic:

Amongst various metrics that Kafka monitoring includes consumer lag is nearly the most important of them all. In this post, we will explore potential reasons for Kafka consumer lag and what you could do when you experience lag.

This post is fairly high-level, and it does a good job of explaining the notion to someone without much familiarity with Kafka.