tutoriel90 %0 slashes consumer throughput by 90%

Critical regression in Kafka 3.9.0 slashes consumer throughput by 90%

Apache Kafka v3.9.0 suffered a major throughput degradation (10x drop) in ZooKeeper mode, discovered in August 2025

Published 10sem1 sourceNotable

≈ 22sSpeed

The fact

The min.insync.replicas parameter was the culprit: changing its value from 1 to 2 caused performance collapse

A three-line code fix resolved the issue and restored normal throughput levels

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