Glossary term
What is Consumer lag? Meaning for developers
How far behind a consumer is. Example: Rising lag = consumers can't keep up.
Learn it properly · System DesignLesson 36: Apache Kafka FundamentalsThirty services all need each other's data, and the data team wants to replay last week. How Kafka's simple idea — a partitioned, replicated, append-only log — became the backbone of event streaming: topics, keys, offsets, consumer groups, retention and compaction.