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financeMEDIUM2026-05-03 16:06 UTC

How 3 Lines of Code Caused a 10x Kafka Throughput Drop

In August 2025, a user reported that Apache Kafka v3.9.0 dropped consumer throughput by 10x. Other users reproduced it. The culprit was a configuration called min.insync.replicas, and the fix was three lines of code. Sharad Garg opened a ticket titled "Consumer throughput drops by 10 times with Kafk

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