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How do you monitor consumer lag in Kafka, and how can you reduce it?

SQLmedium0.3 min readPremium
Frequency
Low
Asked at 1 company
Category
487
questions in SQL
Difficulty Split
130E|271M|86H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Fragma Data Systems
Key Concepts Tested
partition
Expert AnswerPremium
59 wordsInterview-ready
**Monitor**: Lag = log end offset - consumer offset. Tools: Kafka Consumer API, JMX, Burrow, Grafana. **Reduce lag**: (1) Scale consumers (same group)—more partitions. (2) Increase partitions (requires rebalance). (3) Optimize processing—async I/O, batch. (4) Scale downstream—don't block on slow DB. (5) Temporarily add consumer instances. **Alert**: Lag > 10K or threshold. **Root cause**: Slow processing vs....
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