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Troubleshoot Kafka Consumer Lag and Endless Rebalances

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Self-Hosting & Infra advanced 8 min read $0.01 Updated 2026-10-19

Diagnosing Kafka consumer problems: measuring lag per partition, parallelism limits, max.poll.interval.ms and session timeout causing rebalances, batch size tuning, commit strategies, poison messages and dead-letter queues, static membership and partition skew.

Consumer lag keeps growing or the group rebalances constantly. Check partition count and parallelism, slow processing vs poll timeouts, heartbeat settings, offset commits and poison messages.

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#kafka#consumer-lag#rebalance#streaming#troubleshooting

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