Why do Kafka consumers sometimes show lag = 1 forever?
apache-kafkakafka-consumerdistributed-systems
Kafka consumers sometimes showing lag = 1 forever, despite consuming messages
Synthesized Answer
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Kafka consumers showing lag = 1 forever can be due to the consumer reading the last committed offset, but not the latest available offset. This can happen when the consumer is configured to read from the last committed offset, and there's a single message that hasn't been fully processed or committed. Check if the consumer is stuck on a particular message or if there's an issue with offset commits. Review consumer configuration, particularly 'auto.offset.reset' and 'enable.auto.commit' settings.
Key Takeaways
Check consumer configuration, particularly 'auto.offset.reset' and 'enable.auto.commit'
Verify if the consumer is stuck on a particular message
Review offset commit logic to ensure it's working correctly
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